Electro-Optical Device Asymmetric Pixel Opening Widths
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Solution Overview
Problem
Existing image display devices face challenges in achieving bright color display without using color filters, as the optical transmittance at certain pixel openings is lower due to inefficient light-gathering spots, leading to potential color mixture and display darkness.
Innovation Solution
The electro-optical device design includes pixels with distinct opening portions for different color beams, where the width of the second and third opening portions is greater than the first, allowing for oblique entry of color beams, thereby reducing transmittance decrease and minimizing color mixture, and the light-shielding portion width is optimized to ensure sufficient transmittance and prevent beam mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the second and third pixel opening portions are arranged with the first pixel opening portions centered therebetween at a predetermined pitch, then color mixture between different color beams is reduced, but optical transmittance decreases and display becomes dark
Solution Approach 1:
The patent applies local quality by making the second and third pixel opening portions wider than the first pixel opening portion. This asymmetric design compensates for the lower optical transmittance at the second and third positions caused by oblique light entry, thereby balancing the brightness across different color beams while maintaining the pitch-based arrangement that prevents color mixture.
Solution Approach 2:
The patent changes the parameter of opening portion width to resolve the contradiction. Specifically, the second and third pixel opening portions are designed with a greater width than the first pixel opening portion. This parameter adjustment compensates for the reduced optical transmittance at the second and third positions, ensuring adequate display brightness while preserving the color separation achieved through the pitch-based arrangement.
2Object-affected harmful factors
If the principal light of the second and third color beams enters the pixel opening portions in an oblique direction, then color mixture with the first color beam is reduced, but light-gathering efficiency decreases and transmittance is lower
Solution Approach 1:
The patent applies local quality by providing different widths for different pixel opening portions. The second and third pixel opening portions are made wider to compensate for the lower optical transmittance caused by oblique light entry at these positions, while the first pixel opening portion maintains a standard width since it receives light in the normal-line direction.
Solution Approach 2:
The patent employs asymmetry by making the second and third pixel opening portions wider than the first pixel opening portion. This asymmetric design addresses the uneven optical transmittance distribution caused by the different angles of light entry, ensuring that all color beams achieve adequate brightness despite the oblique entry at the second and third positions.
3Illumination intensity
If the width of the second and third opening portions is increased to compensate for lower transmittance, then display brightness is improved, but the distance between light-gathering spots increases risking color mixture
Solution Approach 1:
The patent applies local quality by selectively increasing the width of only the second and third pixel opening portions, while maintaining the first pixel opening portion at a standard width. This targeted approach compensates for transmittance losses at specific positions without uniformly increasing all opening widths, thereby controlling the overall pitch and preventing excessive separation of light-gathering spots.
Solution Approach 2:
The patent changes the width parameter of specific pixel opening portions (second and third) to compensate for their lower optical transmittance. By adjusting only these specific parameters rather than all opening portions uniformly, the patent achieves adequate brightness compensation while maintaining control over the overall pitch and preventing color mixture between adjacent pixels.
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 enables bright and beautiful color display without color filters by optimizing the width of each opening portion and light-shielding portion, ensuring efficient light-gathering and reduced risk of color mixture, thus enhancing display brightness and clarity.
Implementation Method 1
a light-gathering element for gathering the color beams; a light-shielding portion that partitions off a first opening portion, a second opening portion, and a third opening portion from one another, the first opening portion corresponding to the first sub pixel, the second opening portion corresponding to the second sub pixel, and the third opening portion corresponding to the third sub pixel
Data Source
AI summary
As an electro-optical device, a liquid crystal device includes micro lenses ML each of which is provided as a light-gathering element for the corresponding one of pixels, and further includes a light-shielding portion. Red (R), green (G), and blue (B) beams enter the micro lens ML at angles different from one another. The light-shielding portion partitions off a first opening portion corresponding to a sub pixel, a second opening portion corresponding to a sub pixel, and a third opening portion corresponding to a sub pixel from one another. When the width of the first opening portion in the predetermined direction (X direction) is defined as L1 and when the width of the second opening portion or the third opening portion in the predetermined direction is defined as L2, a relationship of L1<L2 holds true.