OLED Touch Sensor Light Absorbing Pattern Red Subpixel Interference
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Solution Overview
Problem
Internal type touch panels in organic light emitting display devices face challenges in accurately detecting user touches due to weak light intensity and interference from non-touch related light sources, leading to potential touch errors.
Innovation Solution
The design includes a first substrate with pixel units and a second substrate with sensor units, where the pixel units are arranged to minimize direct light interference, and a light absorbing pattern or transparent layer with reflective grooves on the second substrate to prevent stray light from reaching the sensor units, enhancing light recognition performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the photo sensor is placed close to the pixel units for compact design, then the device structure is simplified, but direct light from pixel units interferes with the sensor causing touch errors
Solution Approach 1:
The harmful light from red subpixels is extracted and blocked by introducing a light absorbing pattern unit specifically positioned between the red subpixels and the sensor unit, separating the light source from the sensor path
Solution Approach 2:
A light absorbing pattern unit acts as an intermediary element between the pixel units and sensor unit, selectively absorbing harmful light while allowing the device to maintain its compact structure
2Measurement precision
If light absorbing pattern unit is added to block direct light, then touch detection accuracy is improved, but device complexity increases
Solution Approach 1:
The light absorbing pattern unit is applied locally only in specific regions where red subpixels are located and where light interference occurs, rather than covering the entire device, thus minimizing the increase in device complexity
Solution Approach 2:
The light absorbing pattern unit utilizes black color to absorb light, leveraging optical properties to achieve the desired effect without complex mechanical or electronic components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the accuracy of touch recognition by reducing direct light interference and enhancing the sensitivity of the sensor units, thereby increasing the reliability of touch detection in organic light emitting display devices.
Implementation Method 1
Light emitted from the plurality of pixel units may be absorbed by the light absorbing pattern unit
Implementation Method 2
reflected by the second substrate so as to prevent the light being incident on the sensor unit
Implementation Method 3
Each sensor unit may include a photo sensor absorbing light having a red wavelength
Data Source
AI summary
An organic light emitting display device with a touch screen function, the apparatus including a first substrate including a pixel region and a nonpixel region, a second substrate disposed above the first substrate so as to be spaced apart from the first substrate, a plurality of pixel units disposed in the pixel region, and a sensor unit disposed in the nonpixel region and detecting light, where each of the plurality of pixel units includes a red subpixel, a green subpixel and a blue subpixel, and the red subpixel is arranged so as not to be adjacent to the sensor unit.