Multiple Cell Gap Transreflective LCD Chromatic Dispersion
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Solution Overview
Problem
Conventional transreflective liquid crystal displays (LCDs) face challenges with chromatic dispersion and reduced brightness due to complications in adapting to different wavelengths of primary colors, particularly in achieving consistent transmission rates for red, green, and blue lights.
Innovation Solution
The implementation of multiple cell gaps with varying thicknesses, achieved through the use of dielectric and photosensitive organic layers, allows for the formation of distinct cell gaps between substrates for different color pixels, enabling adjustment based on wavelength and minimizing chromatic dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple cell gaps LCD comprising bumps with various thicknesses is used to adapt wavelengths of three primary colors, then chromatic dispersion is improved, but device complexity increases
Solution Approach 1:
The invention divides the pixel area into multiple sub-pixel areas (first, second, third sub-pixel areas) corresponding to different colors (red, green, blue). Each sub-pixel area has a different cell gap thickness formed by selectively removing dielectric layers. This segmentation allows each color to have an optimized cell gap for its wavelength, reducing chromatic dispersion while maintaining a relatively simple overall structure without requiring complex external components.
2Object-affected harmful factors
If two compensative films (1/4 wavelength and 1/2 wavelength) are attached to outer surfaces of substrates, then chromatic dispersion is improved, but device complexity and brightness are reduced
Solution Approach 1:
The invention extracts the chromatic dispersion compensation function from external compensative films and integrates it directly into the cell gap structure. By forming different thickness dielectric layers (first, second, and third dielectric layers with different thicknesses) in different sub-pixel areas, the cell gap itself provides the wavelength adaptation needed for each color, eliminating the need for additional compensative films and their associated complexity.
3Object-affected harmful factors
If compensative films are attached to substrates, then chromatic dispersion is improved, but LCD brightness is reduced
Solution Approach 1:
The invention merges the functions of cell gap formation and chromatic dispersion compensation into a single integrated structure. The dielectric layers serve dual purposes: they define the cell gap boundaries and simultaneously provide the thickness variation needed for wavelength adaptation. This consolidation eliminates the need for separate compensative films that would add optical interfaces and reduce brightness, while achieving the same chromatic dispersion compensation effect.
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 transmission rates for various color lights, maintaining consistency across different applied voltages and reducing chromatic dispersion, while avoiding the brightness reduction associated with previous solutions.
Implementation Method 1
a photosensitive organic layer is formed on the first substrate and then exposed, wherein the photosensitive organic layer has first, second, and third exposing depths respectively on the first, the second, and the third pixel areas
Data Source
AI summary
A LCD having multiple cell gaps and a method producing the same are provided. By stacking various numbers of dielectric layers and/or a photosensitive organic layer with various thicknesses on a display array substrate, various cell gaps for pixels of various colors can be obtained.