Photosensor Light Shielding Walls for OLED Brightness Uniformity
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Solution Overview
Problem
In OLED display apparatuses, the non-uniform brightness caused by light emitted from adjacent subpixels affecting photosensor readings leads to inaccurate brightness compensation, resulting in uneven brightness across the display panel.
Innovation Solution
A display apparatus with a counter substrate featuring photosensors and light shielding walls on a base substrate, where the light shielding walls partially or completely shield the lateral sides of the photosensors from light emitted by adjacent subpixels, ensuring accurate brightness detection and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photosensors are disposed to detect brightness of each subpixel, then brightness compensation capability is improved, but measurement precision deteriorates due to light interference from adjacent subpixels
Solution Approach 1:
A light shielding wall is introduced as an intermediary element between adjacent subpixels and photosensors. This light shielding wall blocks stray light from adjacent subpixels from reaching the photosensor, thereby eliminating the interference that degrades measurement precision while preserving the photosensor's ability to detect brightness for compensation purposes.
Solution Approach 2:
The display structure is segmented by introducing light shielding walls that physically divide and isolate the optical paths between adjacent subpixels and photosensors. This segmentation prevents cross-talk between neighboring pixels, ensuring that each photosensor only detects light from its corresponding subpixel, thus maintaining high measurement precision while enabling accurate brightness compensation across the entire display.
2Measurement precision
If light shielding walls are added to shield photosensors, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Instead of implementing a comprehensive shielding system across the entire display, light shielding walls are strategically placed only at specific locations where photosensors are positioned. This localized approach provides precise shielding exactly where needed to improve measurement precision, while avoiding unnecessary structural complexity in other regions of the display device.
Solution Approach 2:
The light shielding wall serves as a simple intermediary element that can be integrated into the existing display structure without requiring fundamental redesign. By placing these walls between adjacent subpixels and photosensors, the system achieves improved measurement precision through a relatively simple structural addition rather than complex system-level changes.
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 light emitting brightness values detected by photosensors, leading to enhanced brightness uniformity across the OLED display panel by preventing interference from adjacent subpixels.
Implementation Method 1
a respective one of the plurality of light shielding walls is configured to at least partially shield a lateral side of a respective one of the plurality of photosensors from light emitted from adjacent subpixels
Implementation Method 2
an optical compensation device on the base substrate configured to adjust light emitting brightness values of the plurality of subpixels to target brightness values respectively, the optical compensation device comprising a plurality of photosensors configured to respectively detect light emitting brightness values of the plurality of subpixels
Data Source
AI summary
A display apparatus having a plurality of subpixels is provided. The display apparatus includes an array substrate and a counter substrate facing the array substrate. The counter substrate includes a base substrate; an optical compensation device on the base substrate configured to adjust light emitting brightness values of the plurality of subpixels to target brightness values respectively; and a plurality of light shielding walls on the base substrate. The optical compensation device include a plurality of photosensors configured to respectively detect light emitting brightness values of the plurality of subpixels. A respective one of the plurality of light shielding walls is configured to at least partially shield a lateral side of a respective one of the plurality of photosensors from light emitted from adjacent subpixels.