Liquid Crystal Display Pixel Electrode White Sub-Pixel Compensation
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Solution Overview
Problem
Conventional RGBW liquid crystal displays (LCDs) suffer from non-uniform cell gaps, leading to non-uniform transmittance-voltage (T-V) curves, which affect optical properties such as contrast ratio and viewing angles due to the larger cell gap of the white resist pattern compared to the red, green, and blue resist patterns.
Innovation Solution
The implementation of a liquid crystal display with a pixel electrode comprising parallel electrode portions of varying width, angle, and separation distance, specifically in the white sub-pixel, to adjust and compensate for the non-uniform cell gaps, ensuring uniform T-V curves across all color units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If white resist pattern is formed by filling gaps in coating layer, then white sub-pixel can be created, but cell gap becomes non-uniform (larger in white sub-pixel than in color sub-pixels)
Solution Approach 1:
The patent applies local quality by making the pixel electrode structure different in the white sub-pixel compared to color sub-pixels. Specifically, the pixel electrode in the white sub-pixel has a different configuration (different width, angle, or separation distance) to compensate for the larger cell gap, while other sub-pixels maintain their original structure. This localized differentiation resolves the contradiction by allowing the white sub-pixel to have its specific structural characteristics without affecting the uniformity of other sub-pixels.
2Adaptability or versatility
If non-uniform cell gaps occur, then mixed RGBW structure is achieved, but T-V curves become non-uniform affecting contrast ratio and viewing angles
Solution Approach 1:
The patent applies parameter changes by adjusting the geometric parameters (width, angle, separation distance) of the pixel electrode in the white sub-pixel to compensate for the larger cell gap. By changing these parameters, the T-V curve characteristics are normalized across all sub-pixels, ensuring uniform optical properties including contrast ratio and viewing angles while maintaining the mixed RGBW structure.
3Manufacturing precision
If pixel electrode structure is modified in white sub-pixel, then uniform T-V curves are achieved, but device structure becomes more complex
Solution Approach 1:
The patent resolves the contradiction between T-V curve uniformity and device complexity by applying local quality - the pixel electrode structure is modified only in the white sub-pixel while other sub-pixels maintain their original uniform structure. This localized modification achieves uniform T-V curves across all sub-pixels without unnecessarily complicating the entire device structure, thereby balancing precision improvement with complexity control.
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 achieves uniform transmittance-voltage curves by adjusting the width, angle, and separation distance of the pixel electrode portions in the white sub-pixel, thereby enhancing the optical properties and consistency of the display.
Implementation Method 1
FFS-LCDs have high a aperture ratio and transmittance. The FFS-LCD device achieves wider viewing angle by orienting the liquid crystal molecules 320 of the liquid crystal layer 306 to be parallel with the first and second substrates 302 and 304 using an electric field 322 between the pixel electrodes 310 and the common electrode 308
Data Source
AI summary
A liquid crystal display is disclosed. A first substrate and a second substrate correspond to each other. A plurality of first common electrode and a second common electrode are arranged on the first substrate. A plurality of first pixel electrodes and a second pixel electrode correspond to the first common electrodes and the second common electrode separately, and each of the pixel electrodes includes a plurality of electrode portions having a width l, tilted an angle θ, and separated by a distance w. A plurality of first color units and a second color unit are arranged on the second substrate and correspond to the first pixel electrodes and the second pixel electrode separately, wherein at least one of the width l, the distance w and the angle θ in the first color units is different from that in the second color unit.