LCD Panel Sub-Pixel Segmentation for Color Washout
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Solution Overview
Problem
Liquid crystal displays (LCDs) suffer from limited viewing angles due to the varying light transmittance caused by the orientational alignment of liquid crystal molecules, leading to color washout issues, which restrict their applications.
Innovation Solution
The LCD panel design incorporates multiple scanning lines and data lines with specific transistor configurations and capacitors, including coupling capacitors, to apply delayed scanning signals, resulting in distinct voltages at the main and sub-pixel electrodes during different frame periods, enhancing color washout performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystal molecules are aligned in a fixed orientation for light transmittance control, then light transmittance can be controlled, but viewing angle is limited
Solution Approach 1:
The pixel electrode is divided into a main pixel electrode and a sub-pixel electrode, which are independently controlled by different scanning signals. This segmentation allows different voltage levels to be applied to different parts of the pixel, creating multiple brightness levels that improve color washout and expand the effective viewing angle range.
Solution Approach 2:
The patent introduces a time dimension by applying delayed scanning signals to the sub-pixel electrode relative to the main pixel electrode. This temporal dimension creates distinct voltage states at different times within each frame period, enabling multiple brightness levels from a single pixel structure and improving viewing angle characteristics.
2Device complexity
If conventional single scanning signal is used per pixel row, then device complexity is low, but color washout performance is poor
Solution Approach 1:
Each pixel row is divided into two independently controllable groups: main pixel elements controlled by scanning signal gn and sub-pixel elements controlled by scanning signal gn-CS. This segmentation of the scanning signal allows independent voltage control of main and sub-pixel electrodes, improving color washout performance while maintaining relatively simple device architecture.
Solution Approach 2:
The patent employs periodic scanning signals with a frame period TFP, where each frame period contains distinct time intervals for applying voltages to main and sub-pixel electrodes. This periodic action with delayed timing creates multiple brightness levels per pixel, significantly improving color washout performance without substantially increasing 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
This configuration improves color washout by achieving multiple brightness levels per pixel, extending the image display from conventional 8 domains to 12 domains, making the gamma curve closer to gamma 2.2 and enhancing overall image quality.
Implementation Method 1
Since the functionality of LCDs is based on the birefringence effect, the transmittance of light will vary with different viewing angles.
Data Source
AI summary
An LCD panel with color washout improvement. In one embodiment, the LCD panel includes a plurality of pixels spatially arranged in a matrix form, each pixel defined between a respective pair of scanning lines (Gn, Gn<sub2>—</sub2>CS) and two neighboring data lines Dm and Dm+1, comprising a pixel electrode, a first transistor electrically coupled to the scanning lines Gn, the date line Dm and the pixel electrode, and a second transistor electrically coupled to the scanning lines Gn<sub2>—</sub2>CS and the pixel electrode such that when N pairs of scanning signals to the N pairs of scanning lines {Gn, Gn<sub2>—</sub2>CS} and a plurality of data signals to the data lines, the pixel electrode of each pixel has a first voltage at the first duration of a frame period, and a second voltage at the second duration of the frame period, respectively. The first and second voltages are substantially different from each other.