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Model:QM-75HY
Release time:2026-09-11
Nature:Manufacturer
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30% more vision than 65 inches, 30% less budget than 86 inches
Covering 80% of the country's standard classroom main size
Compared with 65 inches, the definition of the rear row jumps.
The whole class does not wait for interaction, and collaboration is more leisurely.
30% cheaper than 86 inches, bulk purchase preferred
The perfect integration of 75-inch interactive whiteboard and standard K-12 classroom environment-professional, standard and reliable
The horizontal axis looks at the number of students, the vertical axis looks at the depth of the classroom, and directly locks the screen size suitable for you. The following is the Qtenboard full range of applicable reference matrices.
| Classroom depth ↓/Number of students → | 10-15 people | 15-20 people | 20-30 people | 30–45 people | 45-60 people |
|---|---|---|---|---|---|
| Within 3 meters | 🟢55 inches | 🟢55 inches | 🟡65 inches | 🔴Overcrowded | 🔴Overcrowded |
| 3-4 meters | 🟢55 inches | 🟢65 inches | 🟢65 inches | 🟡75 inches | 🔴Overcrowded |
| 4-5 m | 🟡65 inches | 🟢65 inches | 🟢65 inches | 🟢75 inch⭐ | 🟡86 inches |
| 5-6 m | 🔴Slightly small | 🟡75 inches | 🟢75 inches | 🟢75 inch⭐ | 🟢86 inches |
| 6-7 m | 🔴Slightly small | 🔴Slightly small | 🟡86 inches | 🟢86 inches | 🟢86 inches |
This section covers more than 70% of the K-12 standard classrooms in the country. As a result, 75 inches has become the "main model" for education procurement-not the largest or the smallest, but just right: 30% more field of view than 65 inches, about 30% less budget than 86 inches, and is the size with the best unit area cost of standard classrooms and the best balance between teaching effect and procurement cost.
Figure: Decision Matrix of 55/65/75/86 "Educational Interactive Whiteboard Applicable Classroom Depth and Number of Students (Data Based on Mainstream K-12 Standard Classroom Design Specification)
Figure: 55/65/75/86 inch four interactive whiteboard size comparison
Figure: Schematic of the 2.5-6 m Golden Viewing Area of the 75-inch Interactive Whiteboard in a Standard Classroom
The visual area, resolution, brightness and viewing angle are upgraded in four dimensions, so that each row of students can see clearly and enjoy it.
Visual area: 75 inches is about 30% more than 65 inches and about 70% more than 55 inches.
4K ultra-high definition resolution, 75-inch large screen is still pixel-level clear
High brightness 4000:1 high contrast, standard classroom natural light is still clear
Wide angle of view, the classroom on both sides of the corner of the students can also see the screen content
In the 30-45-person classroom, the last row of students can see the blackboard and courseware clearly without squinting. When displaying complex chemical structures, bioanatomical maps, and geographic contours, the level of detail is clear-this is not a "big point", but an overall leap in the quality of teaching.
Figure: 75-inch 4K large screen shows the details of complex teaching content
Figure: 55 inch → 65 inch → 75 inch visual area step by step comparison
The 75-inch large screen supports the three windows of courseware blackboard writing video to be displayed on the same screen without blocking each other, and the amount of teaching information is doubled-the combination of speaking and practicing, the performance while speaking, and the completion of one screen.
Figure: 75-inch interactive whiteboard three-window split screen (courseware blackboard writing video)
65 inches can comfortably accommodate 5 people to write together, 75 inches can comfortably accommodate 8 people to write together-this is the necessary configuration for 30-45 class to carry out "class-wide interaction.
The 75-inch screen is about 93cm high and 165cm wide, which is equivalent to 6 pieces of A3 paper side by side. 20-50 touch, 6-26ms low delay, 8 students writing/dragging/operation at the same time without interference, writing smooth close to pen and paper experience.
Figure: 55 inches (3 people crowded), 65 inches (5 people just), 75 inches (8 people leisurely) collaboration space comparison
Figure: 75-inch interactive whiteboard supports two groups of students to group PK answer competition
Education procurement involves multi-party decision-making, and Qtenboard 75-inch interactive whiteboard prepares reasons for each type of role.
Concern: the unity of the teaching level of the whole school, the effectiveness of classroom reform
Concerns: Total cost of bulk purchases, useful life
Attention: participation of students in the back row, preservation and sharing of blackboard writing
Concerns: the whole school unified management, system compatibility
Figure: Professional Display Effect of 75-inch Interactive Whiteboard in School Open Class/Observation Class
The level of classroom informatization is becoming an important impression of education evaluation, parents' open days and regional open classes. A professional, unified 75-inch standard configuration makes the school appear professional, reliable and powerful in every "seen" occasion.
Professional team door-to-door, wall hanging standard, mobile matching, ultra-narrow border and classroom environment integration.
Professional wall-mount bracket with a load capacity of up to 100 kg, ensuring safety and stability; installation can be completed in 2–3 hours without disrupting regular teaching schedules.
It is suitable for multi-functional classrooms and class-sharing classrooms, with one machine for multiple purposes and flexible sharing. With universal wheel, where need to push where.
The bottom is about 90cm from the ground, suitable for students of all grades to touch. The whole machine is about 38-42kg (including wall mount) and is installed by a professional team.
Qtenboard pre-installed professional teaching whiteboard software and massive teaching resources to help teachers save lesson preparation time and improve classroom efficiency.
Start-up and use, no additional procurement. One-stop integration of toolbars, subject tools and resource library entrance enables elderly teachers to get started quickly.
Geometer's Sketchpad, chemical molecular editor, physical simulation laboratory, language learning tools... Covering mainstream disciplines, dynamic demonstration makes abstract concepts "visible".
Teachers prepare lessons at home → synchronize with one button at school → automatically save blackboard writing after class; Students' mobile phones/flat-panel scan codes are added to the classroom for real-time answering and pop-up interaction.
These scenes are likely to be your school tomorrow.
Figure: The real application of 75 inch interactive whiteboard in public junior high school, public primary school, education group standard classroom
We used 65 inches before, but the students in the back row could not see clearly. After changing to 75 inches, the students in the last row can also see the small print on the blackboard. The most important thing is that eight students can solve problems on the screen at the same time, and the efficiency of the group presentation in the math class is doubled.
The 75-inch screen is large enough for the whole class to see the details of the picture when putting the picture book. What I like best is the stroke teaching function-students write Chinese characters on stage, the screen recognizes the stroke order in real time, and prompts if they are wrong, which is much better than my demonstration on the blackboard.
We compared 65, 75 and 86 sizes and finally chose 75 inches. 65 inches is really small in a 40-person classroom, 86 inches is nearly 30% more expensive. 75 inches just balance the cost and effect, 60 classrooms unified configuration, unified teaching standards, maintenance is also convenient.
A county-owned primary school has 32 standard classrooms with a total budget of 500000 yuan. After comparative evaluation, it is selected to Qtenboard a 75-inch educational interactive whiteboard and enjoy an 18% batch purchase discount. The final purchase cost is 464000 yuan, which is still lower than the budget. After six months of use, 90 per cent of teachers mastered all operations within one hour, and the equipment failure rate was only 0.3 per cent.
Horizontal contrast four sizes, 75 inch standard level positioning at a glance.
| Comparison dimension | 55 inches | 65 inches | 75 inches (recommended) | 86 inch |
|---|---|---|---|---|
| Number of applicable students | 15-20 people | 20-30 people | 30–45 people | 45-60 people |
| Classroom Depth | 1.5-4 m | 2-5 m | 3-6 m | 4-7 m |
| Visible area (based on 55 inches) | 1x | 1.4x | 1.7x | 2.2x |
| Price Positioning | Entry Level | Mainstream level | Standard class⭐ | High-end level |
| Typical Scene | Counseling Room/Early Education Classes | small class classroom | Standard K-12 Classroom | Large classroom/lecture hall |
| Recommended Index (30-45 classroom) | ⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ ⭐Most recommended | ⭐⭐⭐⭐ |
Figure: 55/65/75/86 inch full series comparison purchase guide, 75 inch highlight recommended
If your classroom has more than 25 people, it is recommended to directly choose 75 inches -65 inches. The visibility in the back row of classrooms with more than 30 people is obviously reduced. It is a good deal to invest about 25% more budget in exchange for 30% increase in visual area and 3-5 years of redundancy.
If your classroom has no more than 45 people, 75 inches is the best solution for cost performance-30% of the budget spent on 86 inches, which is "over-allocated" in a classroom with 30-45 people and will not bring about an equal proportion of experience improvement. According to the 2026 mainstream market budget standard (Qtenboard official procurement guide):65 inches about 12000-18000, 75 inches about 18000-25000, 86 inches about 25000-35000, 75 inches are just stuck in the "dessert area of effect and budget".
Figure: 75 inches -30-45 standard K-12 classroom preferred recommended size
Figure: Path diagram of purchasing decisions based on the number of students
Qtenboard QM-75HY 75-inch interactive education whiteboard as a benchmark.
| Screen size | 75 inches |
|---|---|
| Resolution | 3840 × 2160(4K UHD) |
| pixel pitch | 0.4296mm × 0.4296mm |
| Brightness | 400–450 cd/m² |
| Contrast | 4000:1 (type) |
| Touch Points | 20-50 points (infrared touch zero fit) |
| Touch Delay | 6-26ms, writing delay <20ms |
| Visual Angle | 178° / 178° |
| Overall size (including frame) | About 1710 × 1020 × 80mm |
| Overall weight | 38-42kg |
| Installation method | Wall mount (standard)/mobile stand (optional) |
| System | Android 14 / Windows OPS optional (dual system) |
| Interface | Hdmi×2, USB-C × 1, USB 3.0 × 2, RJ45 × 1, Wi-Fi 6, Bluetooth 5.2 |
| Speaker | 2 x 20W stereo |
| Power consumption | About 160W (standby <0.5W) |
| Life | 60000 hours (typ) |
Figure: HDMI / USB-C / USB / RJ45 interface real shot
Figure: Low Blu-ray/CE/FCC / RoHS authoritative certification
Figure: Three Views of 75-inch Interactive Whiteboard Products (Including Dimensions)
Low blue light/CE/FCC / RoHS
Bulk purchase can be extended to 5 years
Professional team 2-3 hours installed
90% of teachers get started in 1 hour
Far beyond the industry average of 3-5 years
5 years free software upgrade
30-45 people classroom, a 75 inch whiteboard, just right. Let every row of students see clearly and every decision maker rest assured.
Contact information:Online Customer Service Message Form
Qtenboard Shenzhen Qunmao Display Technology Co., Ltd. | Established in 2009, Shenzhen 330000 ㎡ Intelligent Manufacturing Base | Provides bulk procurement and OEM/ODM services to K-12 schools/education groups/integrators nationwide
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