Liquid Crystal Display Aperture Ratio Adjustment via Light Shielding
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Solution Overview
Problem
Liquid crystal display apparatuses with a multi-domain structure face a decrease in effective contrast value and display quality due to the formation of low contrast regions during chromaticity adjustment of white color, especially when the aperture ratio of certain subpixels is decreased.
Innovation Solution
The apparatus includes a light shielding layer that overlaps the gate wire, source wire, and bent portion of specific subpixels to lower their aperture ratio, preventing the formation of low contrast regions and maintaining effective contrast by adjusting the ratio of aperture ratios of red, green, and blue subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chromaticity adjustment of white color is performed by decreasing the aperture ratio of certain subpixels, then the chromaticity of white color is adjusted to desired chromaticity, but low contrast regions are formed and effective contrast value decreases
Solution Approach 1:
The patent applies local quality by introducing a light shielding layer at specific locations (bent portions of electrodes) within subpixels to create non-uniform light transmission. This allows chromaticity adjustment to be achieved locally at bent portions without uniformly decreasing the aperture ratio of entire subpixels, thereby maintaining effective contrast in the opening regions while adjusting white color chromaticity.
Solution Approach 2:
The light shielding layer acts as an intermediary element that mediates between the electrode structure and the liquid crystal layer. It selectively blocks light at bent portions where low contrast regions form, preventing these regions from degrading overall display contrast while still allowing chromaticity adjustment to occur.
2Adaptability or versatility
If a multi-domain structure is adopted to improve viewing angle, then viewing angle is improved, but low contrast regions are formed at bent portions of electrodes
Solution Approach 1:
The patent addresses the multi-domain structure issue by applying local quality - the light shielding layer is strategically placed only at bent portions of electrodes where domain boundaries create low contrast regions. This localized approach allows the multi-domain structure to maintain its wide viewing angle advantage while compensating for contrast degradation at specific problem locations.
3Manufacturing precision
If the aperture ratio of subpixels is decreased to adjust chromaticity, then the chromaticity adjustment is achieved, but the brightness and light transmission are reduced
Solution Approach 1:
Instead of uniformly decreasing aperture ratio across entire subpixels, the patent uses local quality by placing light shielding layers only at bent portions. This achieves chromaticity adjustment through localized light blocking while preserving brightness in the majority of each subpixel's opening region, avoiding the brightness penalty of uniform aperture ratio reduction.
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 solution effectively prevents a decrease in effective contrast value and display quality by minimizing the overlapping region of opening and low contrast areas, even when chromaticity adjustment of white color is performed, thereby enhancing the display quality.
Implementation Method 1
a light shielding layer which overlaps the gate wire, the source wire and the bent portion formed on a first subpixel included in the plurality of subpixels in a plan view, and makes an aperture ratio of the first subpixel lower than an aperture ratio of a second subpixel
Implementation Method 2
an orientation direction of the liquid crystal molecules included in the liquid crystal layer is changed by an applied electric field, and a light transmission amount of the liquid crystal panel is changed by the applied electric field
Data Source
AI summary
One of pixel electrodes and a common electrode of the liquid crystal display apparatus is a first electrode, and the other one of the pixel electrodes and the common electrode is a second electrode which is disposed between the first electrode and a liquid crystal layer. The second electrode includes linear portions which are formed on each subpixel. Each linear portion includes a bent portion which changes an extension direction of the linear portion. A light shielding layer overlaps a gate wire, a source wire and the bent portion formed on a first subpixel included in a plurality of subpixels in a plan view, and makes an aperture ratio of the first subpixel lower than an aperture ratio of a second subpixel included in a plurality of subpixels and belonging to a pixel identical to a pixel to which the first subpixel belongs.