Pixel Structure for Under-Display Sensors
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Solution Overview
Problem
Existing display technologies face challenges in achieving a high screen-to-body ratio due to the presence of sensors under the display screen, which requires a low-resolution region for sensing functions, leading to differences in display image quality and limitations in using the area for high signal transmittance sensors like cameras or light sensors.
Innovation Solution
A pixel structure with a first region and a second region, where the first region has a higher density of first pixel units and the second region has a lower density of second pixel units, allowing for equal light-emitting areas and gray scale values for sub-pixels, enabling consistent white balance and improved signal transmittance for under-screen sensing functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensors are disposed under the display screen, then the screen-to-body ratio is improved, but the display image quality deteriorates due to low-resolution regions
Solution Approach 1:
The patent divides the display area into a first region (normal display area) and a second region (sensing area) with different pixel densities. The first region maintains high pixel density for normal display quality, while the second region has reduced pixel density to improve signal transmittance for under-screen sensors. This local differentiation resolves the contradiction by allowing high screen-to-body ratio while maintaining display quality where needed.
Solution Approach 2:
The display screen is segmented into distinct functional regions: a first region for normal high-quality display and a second region for sensing functions with lower resolution. This segmentation allows each region to be optimized independently, enabling the screen-to-body ratio to be improved through sensor integration while preserving display image quality in the first region.
2Use of energy by moving object
If pixel density is reduced in the second region, then signal transmittance is improved, but display resolution deteriorates
Solution Approach 1:
Different pixel densities are applied to different regions based on their functional requirements. The second region has reduced pixel density to improve signal transmittance for sensors, while the first region maintains high pixel density for display quality. This local quality differentiation resolves the contradiction between signal transmittance and display resolution.
3Stability of the object's composition
If sub-pixel areas are adjusted for equal light-emitting areas, then white balance consistency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent adjusts the physical areas of different colored sub-pixels (first, second, and third color sub-pixels) to achieve equal light-emitting areas. By changing the area parameter of sub-pixels rather than their positions or colors, the patent achieves consistent white balance across different regions while using a relatively simple manufacturing approach suitable for OLED technology.
Data Source
AI summary
The pixel structure includes a plurality of first pixel units disposed in a first region and at least one second pixel unit disposed in a second region. A distribution density of the plurality of first pixel units is greater than that of the at least one second pixel unit. Each second pixel unit includes a first color sub-pixel, a second color sub-pixel, and at least two third color sub-pixels. In the second region, the at least one first color sub-pixel and the at least one second color sub-pixel are located in a same row, and the at least two third color sub-pixels are located in a same column. A straight line where geometrical centers of the at least two third color sub-pixels are located intersects with a straight line where geometrical centers of the at least one first color sub-pixel and the at least one second color sub-pixel are located.