LCD Pixel Structure Opaque Regions Shield Alignment Patterns
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face challenges in maintaining complete darkness in dark states due to light leakage, which causes color-shifting issues, particularly with blue tinting, and differences in light-leaking amounts among RGB sub-pixels.
Innovation Solution
A pixel structure is developed with opaque regions aligned with alignment controlling patterns, such as protrusions and slits, to shield these patterns and reduce light leakage, ensuring that the opaque regions overlap with at least a portion of the alignment controlling patterns in each sub-pixel, thereby minimizing color-shifting by adjusting the shielding areas for each colored sub-pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment controlling patterns (protrusions and slits) are formed in sub-pixels to control liquid crystal alignment, then the alignment precision is improved, but light leakage occurs causing color-shifting in dark states
Solution Approach 1:
An opaque region is introduced as an intermediary element between the alignment controlling patterns and the liquid crystal layer. This opaque region blocks light from leaking through the alignment patterns while allowing the patterns to maintain their alignment function, thus resolving the contradiction between alignment precision and light leakage.
Solution Approach 2:
The sub-pixel structure is segmented into multiple functional regions: the alignment controlling patterns (protrusions and slits) for liquid crystal alignment, and separate opaque regions for light blocking. This segmentation allows each component to perform its specific function without interfering with the other, eliminating color-shifting while maintaining alignment precision.
2Object-generated harmful factors
If opaque regions are added to shield alignment controlling patterns, then light leakage is reduced, but device complexity increases
Solution Approach 1:
The opaque regions are merged with existing structural elements in the LCD stack, such as the color filter layer or black matrix, rather than being added as completely separate components. This integration approach reduces the overall device complexity while still achieving the light-blocking function needed to prevent color-shifting.
Solution Approach 2:
The opaque regions serve multiple functions simultaneously: they block light leakage from alignment patterns, maintains dark state uniformity across different viewing angles, and can be integrated with existing color filter structures. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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
The solution effectively improves the color performance of the display, especially in dark states, by reducing light leakage and maintaining color accuracy, with experimental results showing improved chromaticity coordinates that align closer to the white state, thus enhancing the display's color representation.
Implementation Method 1
a plurality of opaque regions formed in the first, second and third sub-pixels, and substantially aligned with at least portion of the alignment controlling patterns, so that the opaque regions are substantially overlapped with at least portion of the alignment controlling patterns
Data Source
AI summary
A pixel structure of a display including a first substrate, a second substrate, and a liquid crystal (LC) layer disposed therebetween. The pixel structure comprises a plurality of first, second, and third sub-pixels; a plurality of alignment controlling patterns, respectively formed in the first, second and third sub-pixels for controlling alignment direction of LC molecules of the LC layer; a plurality of opaque regions, respectively formed in the first, second, and third sub-pixels, and substantially aligned with the portion of the alignment controlling patterns, so that the alignment controlling patterns are shielded by the substantially corresponded opaque regions having different areas in at least two of the colored sub-pixels.