Transflective LCD Pixel Sub-pixel Segmentation for Reflectivity
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Solution Overview
Problem
Transflective liquid crystal display (LCD) panels face challenges in achieving sufficient reflectivity without degrading color quality, particularly in the reflection areas of the pixel structure.
Innovation Solution
The introduction of an additional sub-pixel area with a colorless or partially colorless filter segment, which can be entirely reflective or partially reflective, allows for enhanced reflectivity control and brightness adjustment, computed using algorithms based on environmental brightness or user preference, thereby improving color quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If voids or colorless filters are used in the reflection areas to increase reflectivity, then the reflectivity is improved, but the color image quality deteriorates
Solution Approach 1:
The pixel is divided into multiple sub-pixels (red, green, blue, and white sub-pixels), with each sub-pixel having its own reflection and transmission areas. This segmentation allows independent optimization of each sub-pixel's reflectivity without compromising the overall color quality, as each color component can be controlled separately.
Solution Approach 2:
Different sub-pixels are assigned different properties: the white sub-pixel has high reflectivity with a colorless filter, while the color sub-pixels (R, G, B) have color filters for accurate color reproduction. This local differentiation allows the white sub-pixel to provide enhanced reflectivity without affecting the color accuracy of the colored sub-pixels.
2Illumination intensity
If the overall reflectivity in reflection areas is increased to produce desired color density, then the color density is improved, but the color quality deteriorates
Solution Approach 1:
The introduction of a dedicated white sub-pixel segments the reflectivity function from the color reproduction function. The white sub-pixel handles high-reflectivity requirements for brightness and density, while the color sub-pixels maintain color accuracy through their respective color filters.
Solution Approach 2:
The color filter structure uses a composite approach where the white sub-pixel employs a colorless filter material that allows high reflectivity, while color sub-pixels use colored filter materials. This composite filtering strategy enables simultaneous achievement of high reflectivity and color quality.
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 increases reflectivity in transflective LCD panels without compromising color quality, enabling better image performance across varying light conditions.
Implementation Method 1
The reflective electrode 842 also serves as a reflector and is made from one or more highly reflective metals such as Al, Ag, Cr, Mo, Ti and AlNd
Implementation Method 2
The color filter for use with a pixel 10 has three color filter sections R, G, B corresponding to the color sub-pixels 12R, 12G, 12B of the pixel 10
Implementation Method 3
a liquid crystal layer 900 disposed between the layer structures
Data Source
AI summary
The pixel in a transflective color LCD panel of the present invention has an additional sub-pixel area. The pixel is divided into three or more color sub-pixels in R, G, B and at least one sub-pixel M. Each of the color sub-pixels is divided into a transmission area and a reflection area to display color image data. The sub-pixel M can be entirely reflective or partially reflective for displaying a further image data. Two or more algorithms are used to compute the further image data based on the color image data. A selector is used to select one of the algorithms for displaying the further image data. The algorithm selection can be used by a user or automatically selected according to the brightness of ambient light. The transflective LCD panel can be used in a reflective mode when the ambient light reaches a brightness level.