Electro-Optical Device With Asymmetric Light Shielding For Brightness Uniformity
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Solution Overview
Problem
Electro-optical devices displaying full-color images face issues with brightness unevenness due to differences in current values supplied to red, green, and blue pixels, leading to varying pixel lifetimes and difficulties in improving brightness uniformity.
Innovation Solution
Incorporating first and second light shielding portions between pixels with different widths to adjust the pixel opening ratio, allowing for increased brightness of the light emitting region while maintaining constant brightness when viewed from a distance, thereby improving brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the area of the light emitting region is increased to improve brightness, then the brightness increases, but the current density decreases which worsens brightness unevenness
Solution Approach 1:
The patent applies local quality by introducing light shielding portions with different widths at different pixel locations. Specifically, pixels with lower current values receive greater light shielding to reduce their light output, while pixels with higher current values receive less shielding. This local differentiation compensates for current variations and achieves uniform brightness across all pixels without requiring uniform light emitting region areas.
2Illumination intensity
If the current value supplied to the light emitting element is increased to improve brightness, then the brightness increases, but the pixel lifetime decreases
Solution Approach 1:
The patent changes the optical parameters (light shielding width) rather than electrical parameters (current value) to control brightness. By adjusting the light shielding portion widths, the system achieves uniform brightness output while maintaining different current values for different pixels, thereby preserving the longer lifetime of low-current pixels.
3Manufacturing precision
If the light emitting region area is decreased to increase current density and improve brightness uniformity, then brightness uniformity improves, but the total brightness decreases
Solution Approach 1:
The patent moves from controlling brightness through area (two-dimensional) to controlling brightness through optical shielding (introducing a third dimension of light control). By adding light shielding portions that selectively block light paths, the system achieves brightness uniformity while maintaining larger light emitting region areas for higher overall brightness.
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 approach enhances brightness uniformity by increasing current density in the pixel with the lowest current value without reducing the light emitting region area, thus extending pixel lifetime and reducing brightness variations.
Implementation Method 1
a first light shielding portion provided between the first pixel and the second pixel, and a second light shielding portion provided between the second pixel and the third pixel
Data Source
AI summary
There is provided an electro-optical device including a first pixel, a second pixel, a third pixel, a first light shielding portion provided between the first pixel and the second pixel, a second light shielding portion provided between the second pixel and the third pixel, in which a width of the first light shielding portion and a width of the second light shielding portion are different.