OLED Photosensor Area Layout for Reflected Color and Low Visibility
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Solution Overview
Problem
Current light emitting display devices face challenges in optimizing the transmittance of component areas to improve reflected colors while maintaining sensor functionality, particularly when sensors are positioned on the rear surface, and in minimizing user perception of these components.
Innovation Solution
The design incorporates a light emitting display device with a first and second photosensor area, where the first photosensor area allows light to pass through and the second does not, using a black pixel definition layer and light blocking layer to adjust transmittance and reflection colors, ensuring the sensor can detect the front surface while blending with the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a sensor is positioned on the rear surface of the display area, then the camera or optical sensor can be accommodated as display size increases and bezel size decreases, but the component area may become visible from the front surface affecting display aesthetics
Solution Approach 1:
The patent applies local quality by differentiating the optical properties of different regions within the component area. Specifically, first photosensor areas are designed with different transmittance characteristics than second photosensor areas, allowing selective optimization of visibility in different local regions while maintaining sensor functionality throughout the component area.
Solution Approach 2:
The patent changes optical parameters (transmittance) of the component area to control visibility. By adjusting the transmittance of the first photosensor areas differently from the second photosensor areas, the patent optimizes the balance between sensor operation and aesthetic appearance, making the component area less visible from the front surface.
2Ease of manufacture
If the transmittance of the component area is increased to reduce visibility, then the aesthetic appearance improves, but the sensor operation may be affected due to insufficient light reaching the sensor
Solution Approach 1:
The patent divides the component area into different photosensor regions with distinct transmittance properties. First photosensor areas have optimized transmittance for visibility reduction, while second photosensor areas maintain higher transmittance for adequate light reception, ensuring both aesthetic appearance and reliable sensor operation are achieved in different local regions.
Solution Approach 2:
The component area is segmented into multiple photosensor areas (first and second photosensor areas) with different optical characteristics. This segmentation allows the patent to optimize different portions of the component area for different functions: some regions prioritize aesthetic appearance while others prioritize sensor functionality.
3Reliability
If the transmittance of the component area is decreased to improve sensor light reception, then sensor operation is enhanced, but the component area becomes more visible from the front surface
Solution Approach 1:
Different regions of the component area are assigned different transmittance values to balance visibility and sensor operation. First photosensor areas with lower transmittance reduce visibility, while second photosensor areas with higher transmittance ensure adequate light reception for sensor operation, achieving both goals simultaneously in different local regions.
4Ease of manufacture
If uniform transmittance is applied across the entire component area, then manufacturing is simplified, but optimal performance for both visibility and sensor operation cannot be achieved simultaneously
Solution Approach 1:
The patent implements local quality by assigning different transmittance characteristics to different photosensor areas within the component area. This allows each region to be optimized for its specific function while maintaining a relatively simple overall structure that does not significantly complicate manufacturing processes.
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 enhances the reflection color of the component area, allowing the sensor to operate effectively while preventing user recognition of the component, thereby improving display quality and functionality.
Implementation Method 1
a light blocking layer positioned on a front surface of the first sub-photosensor area and that includes an opening that overlaps the first sub-photosensor area
Data Source
AI summary
A light emitting display device includes: a display area; a first component area positioned within the display area and that includes a plurality of pixels, each pixel of the plurality of pixels respectively includes a pixel circuit part, and the first component area further includes a first photosensor area and a second photosensor area between the plurality of pixels. The first photosensor area includes: a first sub-photosensor area positioned between adjacent pixel circuit parts; and a light blocking layer positioned on a front surface of the first sub-photosensor area and that includes an opening that overlaps the first sub-photosensor area on a plane. The second photosensor area includes: a second sub-photosensor area positioned between the adjacent pixel circuit parts; and the light blocking layer positioned on a front surface of the second sub-photosensor area and that overlaps the second sub-photosensor area.