Reflective LCD Panel 1:2:4:8 Pixel Structure for Gray Scale
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Solution Overview
Problem
Reflective liquid crystal display panels face limitations in achieving adequate gray scale levels, resulting in poor visual effects, especially when displaying color graded images, due to an insufficient number of gray scales.
Innovation Solution
A reflective liquid crystal display panel design featuring a specific structure with a 1:2:4:8 reflection area ratio for its pixel structures, utilizing a combination of substrates, signal lines, active components, and a liquid crystal layer to achieve 16 gray scale levels, along with a thin-film transistor integrated gate driver for efficient operation and cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reflective liquid crystal display panel uses a conventional pixel structure with uniform reflection area, then the device complexity is low and manufacturing is simple, but the number of gray scale levels is insufficient resulting in poor visual effect
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first, second, third, and fourth sub-pixel electrodes) with different reflection area ratios. This segmentation allows each sub-pixel to contribute differently to the overall gray scale, enabling 16 gray scale levels through various combinations of the four sub-pixels while maintaining a manageable structural complexity.
2Manufacturing precision
If the display panel increases the number of pixel structures to achieve more gray scales, then the visual effect improves, but the manufacturing cost and device complexity increase
Solution Approach 1:
Different sub-pixel electrodes are designed with different reflection area ratios (1:2:4:8) to create local variations in light reflection properties. This allows the system to achieve 16 gray scale levels through combinations of these locally differentiated sub-pixels rather than requiring 16 separate full-sized pixel structures, significantly reducing manufacturing complexity and cost.
3Manufacturing precision
If the pixel structures have different reflection area ratios to enable gray scale display, then the visual effect improves, but the area of each pixel structure varies causing layout complexity
Solution Approach 1:
The patent transitions from a single-dimension approach (one pixel per gray scale level) to a multi-dimensional approach by dividing each pixel into four sub-pixels with different reflection areas. The gray scale is achieved through the dimensional combination of these sub-pixels (2^4 = 16 levels), effectively using the combinatorial dimension to expand gray scale capability without proportionally increasing the physical area of each complete pixel structure.
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 design effectively enhances the visual effect by achieving 16 gray scale levels, avoiding issues related to charge retention and manufacturing costs, while maintaining low power consumption.
Implementation Method 1
a liquid crystal layer (120) is disposed between the first substrate (100) and the second substrate (110)
Implementation Method 2
a reflective liquid crystal display panel having a display area and a periphery area surrounding the display area
Data Source
AI summary
A reflective liquid crystal display panel including a plurality of pixel units is provided. Each pixel unit includes first and second substrates, one first signal line, four second signal lines, a liquid crystal layer, a first pixel structure, a second pixel structure, a third pixel structure and a fourth pixel structure. The first and second signal lines are disposed on the first substrate. The first, second, third, and fourth pixel structures are electrically connected to one of the four second signal lines respectively and electrically connected to the first signal line, where the first, second, third, and fourth pixel structures respectively include an active component and a reflective pixel electrode electrically connected to the active component, and a reflection area ratio of the first, second, third, and fourth pixel structures is 1:2:4:8. The second substrate is located opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. The display panel displays 16 gray scales to achieve good visual effect.