Square Sub-Pixel Aperture Ratio via Coupled Electrodes
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Solution Overview
Problem
Conventional display devices with a red, green, and blue (RGB) sub-pixel configuration suffer from low brightness and visibility issues due to limited aperture ratio and poor liquid crystal molecule orientation when adapted for square sub-pixel configurations.
Innovation Solution
The display device incorporates a substrate with staggered gate and data lines defining sub-pixels, each comprising a first and second pixel electrode, a coupling electrode, and transistors, arranged in a square configuration to reduce the number of common electrode wires and improve aperture ratio, while maintaining adequate electrode sizes to prevent poor liquid crystal orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If pixel electrodes are vertically arranged in a rectangular sub-pixel configuration, then the sub-pixel structure is suitable for rectangular shapes, but the aperture ratio is greatly reduced and liquid crystal molecule orientation becomes poor when adapted to square sub-pixel configurations
Solution Approach 1:
The sub-pixel is divided into two distinct regions (first region and second region) with pixel electrodes arranged horizontally rather than vertically. This segmentation allows each electrode to maintain adequate size while fitting within a square sub-pixel configuration, thereby improving the aperture ratio while maintaining proper liquid crystal orientation.
2Area of stationary object
If the number of common electrode wires is reduced to enable square sub-pixel configuration, then the aperture ratio improves, but the electrode structure becomes more complex
Solution Approach 1:
The coupling electrode is capacitively coupled to both the first pixel electrode and the second pixel electrode, merging the electrical connection function into a single shared component. This reduces the total number of electrode wires needed while maintaining proper electrical connections, thus improving aperture ratio without proportionally increasing structural complexity.
3Device complexity
If conventional RGB sub-pixel configuration is used, then the display structure is simple, but the brightness and visibility are limited due to restricted aperture ratio
Solution Approach 1:
The patent transitions from a vertical electrode arrangement to a horizontal arrangement, and from rectangular to square sub-pixel configuration. This dimensional change allows the aperture ratio to be maximized within the same pixel pitch, thereby improving brightness and visibility while maintaining a relatively simple display structure through the use of shared coupling electrodes.
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 enhances the aperture ratio and prevents poor liquid crystal orientation, resulting in improved brightness and visibility, particularly in high ambient light conditions.
Implementation Method 1
The coupling electrode is disposed in the first region, and is capacitively coupled to the first pixel electrode
Data Source
AI summary
A display device includes a number of sub-pixels. A main region and a sub region are defined in each sub-pixel, and correspond to a first pixel electrode and a second pixel electrode respectively. The first and the second pixel electrodes are separated from each other and thereby forming a gap between the first and the second pixel electrodes substantially perpendicular to the gate lines. Each sub-pixel includes a coupling electrode, a first switching transistor, a second switching transistor and a sharing transistor. The coupling electrode is capacitively coupled with the first pixel electrode. The first switching transistor and the second switching transistor are electrically connected to a gate line, a data line, and respectively connected to the first and the second pixel electrodes. The sharing transistor is electrically connected to another gate line, the coupling electrode and the second pixel electrode.