LCD Pixel Electrodes Bridge Electrode Light Leakage
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Solution Overview
Problem
Conventional multi-domain vertical alignment liquid crystal displays suffer from insufficient viewing angles and light leakage due to unstable liquid crystal alignment and the use of single bridge electrodes, which affect the uniformity and stability of the display.
Innovation Solution
The design incorporates a capacitor positioned corresponding to the main slit between pixel electrodes and includes bridge electrodes with a shrinking pattern to reduce light leakage and improve liquid crystal alignment, enhancing the aperture ratio and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bridge electrode is used to connect pixel electrodes, then the device complexity is reduced, but light leakage occurs and liquid crystal alignment becomes unstable
Solution Approach 1:
The single bridge electrode is divided into multiple bridge electrodes (first bridge electrode and second bridge electrode) that are spatially separated and positioned at different locations within the pixel. This segmentation allows each bridge electrode to independently control liquid crystal alignment in its respective region, preventing light leakage while maintaining structural complexity at an acceptable level.
Solution Approach 2:
Different regions of the pixel are assigned different bridge electrode structures with specific orientations and positions. The first bridge electrode is positioned to control one region while the second bridge electrode controls another region, allowing each region to have optimized local alignment properties that prevent light leakage.
2Area of stationary object
If the aperture ratio is increased to improve display quality, then the viewing angle improves, but light leakage increases due to insufficient liquid crystal alignment control
Solution Approach 1:
The pixel electrode is divided into multiple regions by the main slit, with each region controlled by a separate bridge electrode. This segmentation enables precise control of liquid crystal alignment in each sub-region, preventing light leakage even when the overall aperture ratio is increased for better display quality.
3Ease of manufacture
If conventional capacitor positioning is used corresponding to protrusions, then manufacturing is simplified, but light leakage occurs and contrast is reduced
Solution Approach 1:
The capacitor is extracted from its conventional position corresponding to the protrusions and repositioned to correspond to the main slit between the pixel electrodes. This extraction and repositioning allows the capacitor to address light leakage in the main slit region without complicating the manufacturing process, as the new position still follows a systematic design rule.
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 reduces light leakage, stabilizes liquid crystal alignment, and increases the transmittance and usability of pixels, addressing the limitations of conventional designs by improving the viewing angle and display quality.
Implementation Method 1
a liquid crystal layer 16 having negative liquid crystals disposed between the top substrate 12 and the bottom substrate 14
Implementation Method 2
The first pixel electrode 20 and the second pixel electrode 28 are separated by a main slit 26 and connected to each other by a rectangular bridge electrode 24
Implementation Method 3
The capacitor 32 is composed of a top capacitor electrode 38, a bottom capacitor electrode 34, and a dielectric layer 36 disposed between the top capacitor electrode 38 and the bottom capacitor electrode 34
Data Source
AI summary
A liquid crystal display panel includes a first substrate, a second substrate, a pixel disposed on the second substrate, a bottom capacitor electrode, a top capacitor electrode, a liquid crystal layer disposed between the first substrate and the second substrate, and a plurality of protrusions disposed on the first substrate. The pixel includes a first pixel electrode and a second pixel electrode, in which a main slit is formed between the first pixel electrode and the second pixel electrode. The bottom capacitor electrode is disposed on the second substrate and overlaps a portion of the main slit, and the top capacitor electrode is disposed on the second substrate and forms a capacitor with the bottom capacitor electrode.