Touch accuracy, latency and parallax: three key indicators that affect the writing experience

Release date: 2026-10-13

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Table of Contents

1. how writing is done once
2. touch accuracy
3. Touch Delay
4. parallax and zero fit
5. How do the three indicators jointly determine the experience?
6.How Qtenboard Validate
7. how different customers accept
8. product and technology advantages
9. How to choose a touch control solution
Case study
FAQ

Introduction: A handwriting that exposes the technical level of a whiteboard

First, recall the real usage scene you have seen: when the teacher writes quickly, does the handwriting follow closely behind the nib? When meeting participants annotate on the edge of the screen, will the line shift? When many people write at the same time, will the line drop, break or touch by mistake? Palm,StylusAnd finger touch screen at the same time, the system can correctly distinguish between the screen and touch layer, whether there is a clear "sense of suspension"?

These problems are not problems of usage habits, but problems of product technology. For interactive whiteboards, the writing experience is not determined by a single parameter. Even if a screen has high resolution and high brightness, if the touch position is inaccurate, the response speed is slow, or there is a significant deviation between the tip and the handwriting, the user will still feel that it "does not look like a really good whiteboard".

For interactive whiteboards, the writing experience is not determined by a single parameter. Inaccurate touch position, slow response speed, and deviation between pen tip and handwriting will make users feel that it is "not like a really useful whiteboard".

Qtenboard (Shenzhen Qunmao)Founded in 2005, it has been deeply engaged in interactive display manufacturing for 20 years. It has 330,000 ㎡ of intelligent manufacturing industrial parks, 16 factories and 8 fully automatic production lines in Shenzhen and Guangzhou. Its products serve 110 countries in the world. In terms of writing experience control, the Qtenboard performs full-link control from accuracy, delay to parallax through infrared multi-touch, Zero-Bonding zero-fit technology, full-screen touch calibration and real scene testing, providing reproducible and acceptable writing experience standards for education, conferences, training and OEM/ODM batch projects.

2005Year of establishment, 20 years of manufacturing experience

330,000㎡Shenzhen & Guangzhou Intelligent Manufacturing Campuses

Article 8Fully automatic production line, daily production capacity of about 200 units

110+Serving Countries and Regions

Qtenboard 交互式白板书写体验测试教师快速书写工程师同步检测触控精度延迟与视差

Qtenboard interactive whiteboard writing experience test: when the teacher writes quickly, the engineer synchronously detects touch accuracy, delay and parallax to ensure that the handwriting follows the tip of the pen.

This guide helps you solve three problems:① Understand the touch parameters in the specification and not be misled by single-point data such as "≤ 6ms" and "1mm"; ② Establish a set of accuracy, delay and parallax acceptance methods that can be landed, and write them into the bidding and procurement contracts; ③ Clarify the priority of different project types to the three indicators, and select matching touch schemes and suppliers.

First understand how writing is done once.

What steps does the touch system go through from nib to handwriting?

Before judging "whether the touch is good or not", first understand the complete link of a handwriting from the pen to the screen. The writing of the interactive whiteboard is completed by four links:

Touch occurs

A finger, stylus, or other object touches the screen. Take Qtenboard common infrared touch scheme as an example: infrared emitters and receivers around the screen form a beam grid, the touch object blocks part of the infrared beam, and the controller calculates the blocked position and converts it into touch coordinates.

→

Touch controller identification

The controller recognizes the number of touch points, determines whether the touch points move, filters false touch and noise, processes palm suppression, double pen or multi-person touch, and sends touch data to the system through USB and other interfaces.

→

Operating System and Application Response

The Android or Windows receives a touch event, the drive or HID Digitizer protocol resolves the coordinates, the whiteboard software, meeting software, or drawing application generates the handwriting, and the graphics processing system renders the handwriting to the screen.

→

Display Screen Rendering

The display panel refreshes the new handwriting and the user sees the final line. The time between when the user starts moving the nib and seeing the handwriting is an important source of delayed experience.

The so-called "write with hand" is actually the result of touch detection, coordinate calculation, system transmission, software processing and screen refresh. And the three metrics discussed in this paper-accuracy, latency, and parallax-correspond to different links in this link:

Touch accuracyWhether the coordinate calculation is accurate or not mainly occurs in the detection and coordinate transformation of link 1-2.

Touch DelayIdentification, transmission, software rendering, screen refresh total time-consuming, across the link 2-4.

ParallaxThe spatial distance between the pen tip, the touch layer and the display image occurs at the physical structure layer outside the link.

Precision, delay and parallax correspond to different problems in this link respectively: precision depends on whether the coordinates are accurate or not, delay depends on whether the handwriting appears fast or not, and parallax depends on whether the nib and the picture look coincident.

Procurement perspective:These three links are respectively responsible for four types of suppliers or components: touch module, controller firmware, system driver/application, and display panel. The ability of the whole machine factory to integrate them directly determines the final writing experience-which is why we should examine the whole machine factory instead of only looking at the parameters of the touch module single product.

Touch accuracy: where is the pen written and where does the line appear?

The touch accuracy of the interactive whiteboard determines whether the writing is accurate or not"

1. What is touch accuracy?

The touch precision refers to a deviation among a position actually touched by a user, a position recognized by a system, and a position where handwriting is displayed on a screen. In the product specification, it may be expressed in the form of ± 1mm, ± 1.5mm, etc. However, the purchaser must confirm three things:Is it a central area measurement or a full-screen measurement? Is it a single-point test or a multi-point simultaneous test? Is it factory calibration data or data after long-term operation?The accuracy performance of the same equipment, center area and four corners, single point and multi-point, just calibrated and used for one year may vary greatly.

2. Factors Affecting Touch Accuracy of Interactive Whiteboard

Touch module

Number and spacing of infrared transmitters and receivers
Touch Frame Mounting Position and Controller Algorithm
Anti-strong light, anti-electromagnetic interference ability

Screen structure

Display Panel Flatness and Glass Thickness
Distance between touch layer and display layer
Optical bonding or zero-gap structure

Factory assembly

Does the Touch Frame align correctly with the screen
Whether the frame is squeezed and deformed, and whether the screw torque is consistent.
Full screen recalibration after installation

Operating environment

Strong light, dust, external electromagnetic interference
Effect of glass protective film
Temperature and humidity changes

The Impact of Touch Precision on Education and Meetings

Education Scene

Accuracy of mathematical formulas, geometric figures and annotations
Is there an offset when the teacher writes small print?
Is it easy for students to write the wrong position when answering questions at the edge of the screen?

Conference Scene

Can you accurately circle the data and key points of the chart?
Whether the annotation of design and flow chart deviates from the target
Whether precise dragging, zooming, and object editing are smooth

4. How do Qtenboard control touch accuracy?

Qtenboard infrared touch scheme touch accuracy up 1.5mm, support 20-50 point touch. The factory is carried out after the whole machine is assembled.Full screen touch calibration: Verify the position of the center, edge and four corners, detect touch blind areas, false touch and coordinate offset, test multi-point simultaneous operation, and verify touch performance under different display modes and operating systems. At the same time, through the fixed BOM, standard assembly process and calibration software control batch consistency, to avoid the same order different batch feel difference.

Procurement Checklist:① Is the precision data measured in the full screen or in the central area? ② Is there any measured data of the four corners and edges? ③ How to ensure the consistency between mass production batches? ④ Does it need to be recalibrated after long-term use? Who should calibrate? These questions should be written into the inquiry and contract.

Touch Delay: How long does it take for handwriting to keep up with the nib?

The touch delay of the interactive whiteboard determines "writing fast or not" and is also the answer to "why writing is delayed"

1. What is Touch Delay?

Touch latency is the amount of time it takes from when the user moves the pen tip or finger to when the touch system detects, the controller processes, the operating system responds, the application draws, and the display presents handwriting. It is the end-to-end time consumption of a link, not a single indicator of a link.

There may be several similar terms in the supplier specification, which must be distinguished during procurement:

Specification Terminology	Meaning	Attention
Touch response time	Speed of touch detected by the touch system	These are not necessarily the same indicators and cannot be substituted for each other.
Touch scanning time (scan time)	Cycle for IR/Sensor to complete a full-screen scan
Controller response time (controller response time)	Time for the controller to process and report coordinates
Writing latency (writing delay)	End-to-end delay from pen down to screen on handwriting
Display response time (display response time)	Time of panel pixel state change

"Touch response time ≤ 6ms" does not necessarily equal full writing delay ≤ 6ms. Full write latency is also affected by system, application, GPU, refresh rate, display response, and test methodology. At the time of purchase, the supplier shall be required to explain the measurement definition and carry out the actual test on site.

2. How will users feel when the delay is high?

The handwriting is obviously behind the nib, and the line is broken or deformed when writing quickly
Circles, arrows and curves are not drawn naturally enough, and "tailing" occurs when dragging objects"
Video conference annotations affect the rhythm of expression, and the presentation experience is obviously discounted.
Teachers will unconsciously slow down their writing speed, even give up handwriting, and complex courses rely more on keyboards and prefabricated courseware.

3. Factors Affecting Touch Latency

Touch detection speed

Sensor scan frequency
Controller processing capacity
Simultaneous Touch Points

transmission and drive

USB Controller and Interface
HID Digitizer 驱动
Android and Windows Touch Protocol Differences

System and Applications

CPU/GPU Performance and Memory
whiteboard software rendering engine
Video conferencing software load

Display end

Screen refresh rate
Show Response Time
Image processing algorithm

4. Qtenboard delay control

Qtenboard single point response time 7ms, multi-point response time 10-15ms. In order to make this number true in real use, collaborative control is Qtenboard at the whole machine level: the touch controller is matched with the motherboard and system to optimize multi-touch event transmission; Android and Windows dual system tests; Version management of touch firmware; The touch layer and the display structure are designed cooperatively, and the Zero-Bonding zero-fit structure is adopted to reduce parallax and touch feedback distance.

The test covers real load scenarios: single person fast writing, multiple people writing at the same time, multi-point scaling and rotation, multi-window running, video conference sharing screen, high-resolution video playback and annotation in parallel.

Procurement Checklist:① Please ask the supplier to clarify the measurement definition and test method of "response time"; ② Use quick circle drawing and quick line marking to test the chirality on site; ③ Re-test in high-load scenarios such as video conference and multi-window; ④ Confirm whether the delay performance of the Android and Windows systems is consistent.

Parallax: Why do the nibs and lines not appear to coincide?

Interactive whiteboard parallax determines "write naturally and unnaturally"

1. What is parallax?

Parallax refers to a visual deviation caused by a structural distance or a viewing angle between a pen tip position seen by a user, a position where a touch actually occurs, and a plane where content is displayed. In the interactive whiteboard, the parallax is common in the following situations: the touch layer is located in front of the display panel, the protective glass is thick, there is an air layer between the touch layer and the display panel, the viewing angle is skewed, the touch coordinate calibration is inaccurate, and the height of the screen edge structure is inconsistent.

2. What is the difference between parallax and touch accuracy and delay?

Indicator	Problem solved	User feelings
Touch accuracy	Whether the coordinate calculation is accurate	The writing position is right
Touch Delay	Whether the system response is timely	Write with or without hand
Parallax	Whether the pen tip and touch layer coincide with the image	Is it written naturally?

The accuracy is high but the delay is large, and the handwriting position is accurate but cannot keep up with the nib. The delay is low but the parallax is large, and the handwriting appears quickly but the position seems to deviate from the nib. The accuracy and delay are excellent but the parallax is large, and users will still feel "suspended". All three must be controlled simultaneously to create a natural writing experience.

3. Factors of parallax

Structure distance

Glass thickness
Touch Frame Structure
Air gap between touch layer and display layer
Thickness of optical adhesive layer

Laying process

Air gap structure prone to multilayer reflection and visual spacing
Optical bonding/zero bonding can reduce the air layer between the display layer, touch layer and glass

Installation and viewing angle

Standing in front of the screen and looking at the oblique side, the parallax experience may be different.

4. Qtenboard Zero-Bonding zero fit technology

Qtenboard adoptionInfrared Touch Zero-Bonding Zero FitScheme, the touch layer and the display panel zero gap fit, match 1mm tempered glassReduce the reflection and refraction caused by the air layer, and improve the display clarity and writing experience. Compared with the air gap structure, the zero-fit scheme makes the spatial distance between the pen tip, the touch layer and the display image smaller, which is also the key process to reduce the parallax of the interactive flat panel.

Qtenboard Zero-Bonding 零贴合结构剖面图触控层与显示面板零间隙贴合降低视差

Qtenboard Zero-Bonding zero-bonding structure profile: the touch layer and the display panel are bonded with zero gap, and 1mm tempered glass is matched to reduce parallax and reflection caused by air layer.

For writing, the value of Zero-Bonding zero-fit is not just to make the screen thinner, but to minimize the spatial distance between the pen tip, touch layer and the displayed image. When the user is writing or drawing quickly, the smaller structure spacing helps to reduce the visual "floating feeling" and make the handwriting closer to the real pen position.

Procurement Checklist:① Confirm whether the parallax, bonding structure and glass specifications are written in the specification; ② Write several strokes at the front and oblique side of the site, and observe the coincidence degree between the nib and the handwriting; ③ Test the edge and center of the screen respectively, and the edge is often the most obvious position of parallax.

How do the three indicators together determine the writing experience?

Precision, delay and parallax are indispensable

By matching the problems encountered by users in actual use with the three indicators, you can more intuitively judge the "problem" of an interactive whiteboard ":

Problems encountered by users	Main related indicators	Typical manifestations
Write Position Offset	Touch accuracy	The nib does not coincide with the line
Handwriting is backward when writing fast	Touch Delay	Line tailing, broken
The nib and lines have a sense of suspension	Parallax	The handwriting appears under the glass
Screen edge difficult to write accurately	Accuracy Calibration	Deviation or blind area at the corner
Many people write at the same time and lose some.	Multi-point controller system performance	Missing line, object misselection
Touch the screen with the palm of your hand	palm suppression algorithm	Extra lines or misoperation
Poor performance after system change	Driver Firmware Protocol	Android and Windows experiences are inconsistent
Touch drift after a period of use	Structural Stability Calibration	Requires recalibration or repair

Natural writing experience = touch accuracy × low latency response × low parallax structure × stable system and software synergy. The multiplication concept is used to make the point that when any one item approaches zero, the overall experience drops significantly.

Procurement perspective:When accepting, don't just look at whether a single parameter is "up to standard", but use "real writing experience" to connect all indicators to verify. No matter how beautiful the paper data of a parameter is, if it is not written with the hand and does not coincide, it is not up to standard for users.

Qtenboard how to verify the three indicators?

Not only look at the specifications, but also verify them in real writing.

1. Accuracy test

Full-screen grid point calibration, center area test, four corners and edge test; Straight, circular and diagonal writing; Multi-point simultaneous positioning; Touch blind area detection; False touch detection; Palm suppression test.

Factory Process:After the touch module is assembled, the screen enters the calibration station. The engineers detected the center, edge and four corners according to standard procedures, and verified the stability of touch coordinates through straight line, curve, circle and multi-point tests. Only the whole machine that has passed the calibration and functional verification will enter the subsequent aging and factory inspection.

2. Delay testing

Fast continuous writing, fast drawing circles, slashes and curves; Multiple people writing at the same time; Multi-finger zoom and rotation; Android/Windows dual system; Whiteboard software and third-party software; Video conference annotation; High load operation.

3. Parallax test

Writing on the front of the screen, writing at a squint angle, standing writing at different heights; writing at the center and edge of the screen; testing of different nib types; verification after the installation of the bonding layer and protective glass.

4. Simulate real classroom and office environment

Qtenboard touch performance testing is not only conducted under ideal darkroom conditions, but also includes realistic writing, multi-touch and anti-touch verification in simulated classroom and office lighting environments. The test scenarios include: bright classroom, conference room ceiling light, side natural light, screen reflective conditions, lecturer fast writing, simultaneous annotation by many people, simultaneous contact of stylus and palm, and long-term continuous use.

5. Re-verification after aging

Touch module 48 hours high temperature aging test (72 hours for some items)After the test, check whether there is touch drift, response drop or edge abnormality, record the parameter changes before and after aging, repair and retest the abnormal products, and associate the test results with the serial number and batch to form a traceable quality record.

Qtenboard Shenzhen factory touch calibration station and 48-hour high-temperature aging test room: each device undergoes full-screen calibration, multi-point test and retest after aging to ensure that the accuracy, delay and parallax meet the standards.

Procurement perspective:The supplier is required to provide test conditions, test data and calibration records for the specific model. The test methods are different, and the results are not comparable. Only the data that clearly states "what environment, what method and what judgment standard" can be used for batch project acceptance.

How should different customers set acceptance criteria?

B2B project acceptance cannot only write "touch sensitive"

Suggestions on Acceptance of Education Projects

Teachers write quickly, students write at the same time
Simultaneous operation of stylus and finger
Line drawing, circle, formula and graphic writing
Four corner and edge accuracy
Long-term classroom use stability
Android and Windows software compatible
Palm suppression and false touch

Suggested documents:Touch specifications, description of touch points, accuracy and delay test methods, burn-in test records, factory calibration reports, after-sales maintenance and spare parts list.

Suggestions on Project Acceptance of Enterprise Meeting

Annotate after wireless screen projection
Test sharing and tagging in conference software
Drag, zoom in, and annotate multiple people at the same time
Connect an external camera, microphone, and OPS
Touch performance after switching between different input sources
Remote management, system upgrade and permission control

Proposal for acceptance of OEM/ODM project

Lock-in touch technology and vendors
Lock Touch Points, Latency, and Precision Definitions
Confirm parallax, fit structure and glass specifications
Clear Android, Windows and driver versions
Establish acceptance criteria for first piece confirmation, batch sampling and mass production
Clarify alternative materials and engineering change procedures
Keep traceability records of touch module, motherboard and whole machine

B2B acceptance form (can be directly used for project acceptance)

Acceptance Items	Suggested confirmation content	Result
Touch accuracy	Center, corner, edge deviation	Qualified/Unqualified
Touch Delay	Single-point and multi-point writing response	Qualified/Unqualified
Parallax	Does the nib coincide with the line	Qualified/Unqualified
Multi-touch	Actual number of simultaneous touches	Qualified/Unqualified
palm inhibition	Whether the palm touches by mistake	Qualified/Unqualified
System compatibility	Performance under Android/Windows	Qualified/Unqualified
Strong light environment	Touch stability under different light	Qualified/Unqualified
Aging test	Verify again after continuous operation	Qualified/Unqualified
Traceability Record	Serial number, lot, calibration data	Qualified/Unqualified

Reminder:It is recommended that the test method, determination criteria and acceptance process be written into the contract or purchase agreement to avoid acceptance disputes caused by vague expressions such as "touch sensitive.

Qtenboard product and technology advantages

From touch frame to machine calibration, Qtenboard how to create a more natural writing experience

Infrared multi-touch

The Qtenboard infrared touch scheme supports 20-50 point touch with a touch accuracy of 1.5mm. It is suitable for K-12 classrooms, enterprise conferences, large-scale education and government projects, and provides a scalable touch scheme in 65-110 inch products.

Low latency touch response

Single point response time 7ms, multi-point response time 10-15ms. The touch controller, motherboard, system firmware and display processing link are tested together to avoid the pursuit of a local parameter alone, but ignore the overall response in real writing.

Zero-Bonding zero-fit low parallax structure

The combination of infrared touch and Zero-Bonding zero fit reduces the structural distance between the touch layer and the display image, improves the visual coincidence between the nib and the handwriting, and reduces the impact of multi-layer reflection on the writing experience. With 1mm tempered glass, to achieve close to the real pen writing feeling.

Multi-system compatible

Android native touch, Windows OPS touch, Windows HID Digitizer compatible; Support double pen, palm suppression and gesture recognition; Adapt to teaching software and conference software.

Verification of the whole process of the factory

Incoming inspection of touch module → assembly of screen and touch frame → full screen calibration → single point and multi-point test → strong light environment test → 48 hours high temperature aging test (72 hours for some items) → retest before leaving factory → binding of serial number and test record.

Manufacturing Strength and Quality Assurance

Established in 2005 with 20 years of manufacturing experience; 330,000 ㎡ industrial park, 16 factories and 8 full-automatic production lines; SMT patch speed 120,000 components/hour; Class 10,000 clean room completes touch panel manufacturing and optical bonding; The one-time pass rate of the whole machine is ≥ 97%, and the aging abnormality rate is <1.5; Service 110 + countries, after-sales response ≤ 4 hours.

International and Regional Accreditation:CEFCCRoHSISO9001CCCEDLA (Google GMS)Anatel (Brazil)

OEM/ODM perspective:Qtenboard supports white brand, full OEM, structural ODM and CKD/SKD export assembly modes, locks BOM, test methods and acceptance rules, cooperates with serial number and batch traceability, and is suitable for mass delivery of overseas distributors, brand customers and government projects.

How do different customers choose their own touch solutions?

Different projects have different priorities for the three indicators.

Project type	The highest priority indicator	Recommended Concerns	Qtenboard Programme
K-12 classroom	Precision Multiplayer Touch	Edge precision, palm suppression, 40-touch, durability	Infrared touch 20-50 points
University Seminar Room	Accuracy Delay	Complex charts, multi-person labeling, software compatibility	Infrared Touch Zero-Bonding
Corporate Conference Room	delayed parallax	Meeting annotation, wireless screen projection, remote collaboration	Infrared touch dual system
Design Review	precision parallax	Fine line writing, electromagnetic pen, pressure sensing	Electromagnetic hybrid scheme optional
Medical training	Low precision reflective	Detail annotation, glass, cleaning and software	Capacitance scheme optional
Large training room	Accuracy Visibility	Screen size, rear reading, multiplayer touch	75-110 inch full size
Government project	three comprehensive	Batch consistency, acceptance documents, after-sales traceability	MES traceback serial number binding
OEM/ODM Project	Indicator definition consistency	BOM Lock, Test Method, Substitute Control	Independent OEM production line indicator lock

Recommended decision path

Determine usage scenario and screen sizeClassroom, conference room and training room have different requirements for size and touch points.

Determine if multiple people are required to write at the same timeDetermine the number of touch points and multi-point stability requirements.

Identify Android, Windows, or dual system requirementsConfirm touch-driven and software eco-compatibility.

Setting Accuracy and Delay Test MethodsClear measurement definition and acceptance scenario.

Evaluate parallax, glass and laminated structuresInfluence writing naturalness and display effect.

Prototype testing under real content and real lightDo on-site real-write verification in the target scene.

Validation of production calibration, aging and traceability processesEnsure batch consistency and traceability.

Lock key technical indicators and acceptance rules in the contractTest methods and criteria are written into the protocol.

★

Real Project Case: How to Landing Three Indicators

The following cases are quoted from Qtenboard official public case materials to help purchasers understand the actual requirements for writing experience in different scenarios.

Qtenboard interactive whiteboards in educational programs: Multiple students write, annotate and drag at the same time, testing multi-touch stability and palm suppression.

Education and K-12

Singapore International School: Digital Transformation of 30 Classrooms

The school's original 30 classrooms rely on old-fashioned projection, no interactive ability, student participation decline. After 4 weeks of prototype testing, the whole school deployed 32 Qtenboard 75 "EDLA certified interactive whiteboards, teachers use Google Classroom integration, screen flipping classroom and multi-touch collaboration tools.

Student participation increased by 40%Lesson preparation time reduced by 60%95% teacher satisfaction after 3 monthsRecommended to 12 league schools

Enterprise · Mixed Meeting

German multinational consulting firm: five office synergies

Customer deploys in five European offices 24 Qtenboard 86-inch dual-system interactive whiteboards, integrated Microsoft Teams and Zoom, built-in wireless screen projection and real-time annotation, instead of multi-supplier assembly scheme, unified conference collaboration experience.

Reduce cross-office travel costs by 50%Three times faster cross-team decision-makingRecovery of investment within 8 months

Enterprise meeting scenario: Qtenboard data annotation on the interactive whiteboard to collaborate with wireless screen projection.

OEM · Latin American Market

Brazil Education Distributor: Government "Digital Classroom" Project OEM Supply

Brazilian education technology distributors need to have Anatel CertificationThe interactive display product, which supplies government projects covering 200 public schools. Qtenboard Delivery Customization 65-inch and 75-inch interactive whiteboards, complete Portuguese UI localization, custom packaging and full Anatel customs clearance documents.

5-year government supply contract for approximately $2.4 million per yearOn-time delivery rate 99.2 per centZero certification clearance delayExpand to 3 Latin American countries in 12 months

Dynamic cooperation:In August 2026, Qtenboard established a strategic cooperation with a Thai project integrator to participate in a 2,000-unit government bidding project (source: Qtenboard Official News). Batch project customers can book a visit to the Shenzhen/Guangzhou factory to verify accuracy, delay and parallax at the prototype stage, and confirm mass production calibration, aging testing, quality traceability and after-sales support solutions.

FAQ: The most frequently asked questions about purchasing interactive whiteboards

Frequently asked questions around touch accuracy, latency, parallax and acceptance methods

1. How much is the touch accuracy of the interactive whiteboard? How to check and accept when purchasing?

The common specifications in the industry are ± 1mm to ± 2mm, and the Qtenboard infrared touch scheme is 1.5mm. Don't just look at this number during acceptance, but confirm the measurement conditions: full screen measurement or only the central area, single point or multi-point, factory or long-term operation. It is recommended to write straight lines and circles at the center, four corners and edges respectively, and let many people write at the same time to observe whether the coordinates are stable.

2. What is the appropriate touch delay for the interactive whiteboard? Is "touch response ≤ 6ms" equal to low writing delay?

Not equal to. The "touch response time" usually only represents the speed of the touch detection link. The complete writing delay also includes the system, application, GPU, refresh rate and display response. Qtenboard single-point response time is 7ms, multi-point response time is 10-15ms, and real experience is guaranteed through dual-system and high-load scenario testing. When purchasing, be sure to ask the supplier to explain the measurement definition, and quickly draw circles, quickly draw lines, measure and chirality on site.

3. Why is there a delay in writing on the interactive whiteboard? Which link is the main card in?

Write latency comes from the entire link: touch detection speed, transmission and drive, system and application load, display refresh. The common reason is that the whole machine factory only optimizes the touch module and ignores the collaboration of the system, software and display terminal. Judgment method: on the same device, use the system's own whiteboard and high-load software to write separately, and compare the difference with the chirality to locate the bottleneck.

4. What does the interactive whiteboard parallax mean? Why does the nib and handwriting not coincide?

Parallax is the visual deviation between the pen tip position, the touch layer and the display image due to the structural distance or viewing angle. The thicker the glass, the larger the air gap, and the farther the touch layer is from the display layer, the more obvious the parallax is. Zero-Bonding zero-fit with thin glass (such as Qtenboard 1mm tempered glass) can significantly reduce parallax. At the time of acceptance, write a few strokes on the screen and the oblique side to observe the coincidence.

5. Which is more suitable for classroom and conference scenarios, infrared touch or capacitive touch?

Infrared touch supports 20-50 points of multi-touch, can be written with fingers/stylus/arbitrary obstructions, and is the mainstream scheme for large-size educational whiteboards and conference tablets. Capacitive touch accuracy and fine-line writing perform well, which are common in scenes with high requirements for detail labeling such as medical training. Select the key to see the use of the scene, touch points and budget, the Qtenboard can provide infrared, capacitive, electromagnetic hybrid and other programs.

6. Why does interactive whiteboard multi-person writing lose points and break lines? How to test?

Many people write lost points and broken lines at the same time, which is usually related to the upper limit of touch points, the processing power of the controller and the performance of the system. Test method: let 4-5 people write and drag on the screen at the same time to observe whether the lines are complete; Then overlay video conference, multi-window and other high-load scene retest. The Qtenboard supports 20-50 touch control and has been tested in multi-person writing and multi-point zoom rotation scenarios.

7. What is the difference between optical bonding (zero bonding) and ordinary air gap structure?

The air gap structure has an air layer between the touch layer and the display panel, which is prone to multi-layer reflection, reduced definition and increased parallax; zero-fit/optical fit closely fits each layer, reduces the air layer, reduces reflection and refraction, and improves parallax and display permeability. Qtenboard Zero-Bonding zero fit with 1mm tempered glass structurally reduces the visual distance between the nib and the handwriting.

8. Under what conditions are the Qtenboard 1.5mm accuracy and 7ms response time measured? Is batch consistent performance guaranteed?

The Qtenboard performs full-screen touch calibration and function verification after the whole machine is assembled. The accuracy and delay data come from the mass production whole machine inspection under standard test conditions, and the batch consistency is controlled through fixed BOM, standard assembly process, calibration software and retesting after 48 hours (72 hours for some items) of high temperature aging. It is recommended to specify the test method and judgment standard in the contract for batch projects, and carry out the first piece confirmation and batch sampling inspection.

9. How long does the interactive whiteboard burn-in test take? Why do purchases look at the burn-in record?

The common practice in the industry is continuous aging for 24-72 hours, and the Qtenboard standard is 48 hours of high temperature aging (72 hours for some items). After aging, the touch accuracy, response and edge performance are retested, and the results are associated with serial numbers and batches. Aging records can reflect whether the product drifts or performance attenuation after long-term operation, which is an important basis for judging the stability of the whole machine and batch consistency.

Conclusion: Let the handwriting keep up with the train of thought, is the real value of touch technology

Touch precision solves "where to write", touch delay solves "how long to appear", and parallax solves "whether it looks natural". Together, the three indicators determine the willingness of teachers, conference participants, and professional users to use interactive whiteboards over the long term.

For interactive whiteboards, touch accuracy, latency, and parallax are never isolated parameters. Precision lets the handwriting fall in the right place, low latency lets the handwriting keep up with the user's movements, and low parallax makes the nib and the line look truly coincident. Only when all three are controlled at the same time, the interactive whiteboard will not just be a touchable display, but will become a real collaboration tool for teachers, conference teams and professional users.

Backed by 20 years of manufacturing experience, 330,000 ㎡ industrial park and Zero-Bonding zero-fit technology, the Qtenboard provides interactive whiteboard solutions with different sizes, systems, touch points and delivery modes for education, conferences, training and OEM/ODM projects. For batch projects, customers can verify accuracy, delay and parallax at the prototype stage, and further confirm production calibration, burn-in testing, quality traceability and after-sales support.

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The accuracy, delay and other indicators in this paper are the reference values under the Qtenboard standard test conditions, and the specific model is subject to the specification and contract agreement.