How is the quality of the touch screen panel?

How is the quality of the touch screen panel?

 

As the core interactive component of modern electronic devices, the quality of touch screens directly determines the smoothness, accuracy, and durability of user experience. Whether it's smartphones, tablets, industrial control panels, or self-service terminals, the quality of touch screens needs to meet the needs of different scenarios. This article will explore in depth how to evaluate the quality of touch screens from the perspectives of technical principles, performance indicators, common problems, and industry applications.

• Core evaluation indicators for touch screen quality

1. Sensitivity and response speed

Sensitivity: Can the touch screen accurately recognize operations such as light touch, sliding, and multi touch.

Response speed: The delay time from touch operation to screen feedback (in milliseconds), low delay (such as<10ms) can improve fluency.

Testing method: Evaluate through professional tools (such as touch testers) or subjective experiences (such as quick scrolling of web pages, game operations).

 

2. Touch accuracy and linearity

Accuracy: The deviation between the touch point and the actual operating position (usually requiring an error of<1mm).

Linearity: The consistency of touch between the edge and center of the touch panel, avoiding sluggish response in the edge area.

 

3. Anti interference capability

Waterproof and oil resistant: Whether it supports wet hands or glove operation (depending on touch technology, such as capacitive screens requiring special design).

Electromagnetic interference (EMI): Can it work stably in complex electromagnetic environments such as factories and medical equipment.

 

4. Durability and reliability

Scratch resistance: Surface glass hardness (such as Corning Gorilla Glass reaching Mohs hardness level 7).

High/Low Temperature Resistance: Suitable for extreme temperature ranges (industrial grade touch screens typically support -20 ° C to 70 ° C).

Service life: The click life of the touch screen panel (such as over 10 million times).

 

5. Optical performance

Transmittance: The influence of touch layer on screen display effect (high-quality capacitive screen transmittance>90%).

Reflection control: Does the anti glare coating effectively reduce ambient light reflection.

• Quality differences of touch screens of different technology types

1. Capacitive touch screen

Advantages: high sensitivity, support for multi touch, high light transmittance, long lifespan.

Disadvantages: High cost, requiring bare finger or dedicated stylus operation (some support glove mode).

Quality key: uniformity of ITO (indium tin oxide) conductive layer, optimization of controller algorithm.

 

2. Infrared touch screen

Advantages: No obstruction, support for large sizes, strong resistance to storms (suitable for outdoor or industrial scenes).

Disadvantages: susceptible to strong light interference, low edge touch accuracy.

Quality key: infrared sensor density, ambient light filtering algorithm.

 

• Key factors affecting the quality of touch screens

1. Materials and processes

Conductive layer materials: ITO (traditional), metal mesh, nano silver wire (higher flexibility and transparency).

Bonding technology: Full bonding (optical adhesive bonding) reduces reflection and improves display effect; Non compliant and prone to dust ingress.

 

2. Controller and firmware

Controller chip: High performance chips such as Xinsi Technology and Duntai Solution can improve signal processing speed and noise resistance.

Firmware algorithm: Optimize touch trajectory prediction and prevent accidental touches (such as palm suppression).

 

3. Environmental adaptability design

Industrial grade protection: IP65/67 dustproof, waterproof, and chemical corrosion resistant coating.

Wide temperature operation: special materials and circuit design to adapt to extreme temperatures.

 

• How to determine the quality of a touch screen?

1. Intuitive testing

Slide test: Quickly slide icons or web pages to observe if they follow your hand.

Multi touch: Draw multiple lines simultaneously to check if the trajectory is coherent.

Edge touch: Click on the four corners of the screen to confirm if the response is consistent.

 

2. Professional testing tools

Touch testing software: such as Touch Test Touchscreen Calibration Tool。

Optical detector: measures parameters such as transmittance and reflectance.

 

3. Brand and Certification

Choose well-known brands such as Chenhong Technology TPK, OFILM, 3M.

View certification standards: CE, FCC, IP protection level, etc.

 

The quality of a touch screen is a vivid reflection of technology, materials, and craftsmanship. Users need to consider application scenarios when making purchases, with a focus on core indicators such as sensitivity, durability, and environmental adaptability. With the advancement of technology, touch screens are developing towards higher precision, stronger durability, and intelligent interaction, which will bring revolutionary experiences in more fields in the future.