LCD Peripheral Electrode Segmentation for Light Leakage Control
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Solution Overview
Problem
Conventional liquid crystal displays suffer from light leakage at the peripheral area due to inadequate light-shielding, resulting in reduced display quality and increased brightness differences between the display and peripheral areas, especially when backlight brightness is enhanced.
Innovation Solution
An electronic controlling method is employed to enhance the equivalent optical density of the peripheral area by using a separate electrode controlled by a constant voltage, in conjunction with a light-shielding layer and polarizers, to manage the liquid crystal molecules and reduce light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding layer is disposed at the peripheral area, then light leakage is reduced, but the brightness difference between the display area and peripheral area becomes more apparent when backlight brightness is enhanced
Solution Approach 1:
The electrode structure is segmented into three distinct parts: a common electrode covering the entire display area, a pixel electrode in the display area, and a separate peripheral electrode in the peripheral area. This segmentation allows independent voltage control of the peripheral region, enabling separate optimization of light shielding in the peripheral area without affecting the display area performance
Solution Approach 2:
Different regions are assigned different electrode configurations and voltage controls: the display area uses standard common and pixel electrodes for image display, while the peripheral area uses a separate electrode with constant voltage control specifically optimized for light shielding. This local differentiation allows the peripheral area to achieve high optical density without compromising display quality
2Manufacturing precision
If the peripheral area is controlled to reduce light leakage, then display quality is improved, but the device complexity increases due to additional electrodes and control circuits
Solution Approach 1:
The separate peripheral electrode is merged with the existing common electrode structure, sharing the same substrate and basic fabrication process. The peripheral electrode extends from the common electrode structure, allowing共用 of manufacturing steps and reducing the actual increase in complexity despite the functional differentiation
Solution Approach 2:
The common electrode serves dual functions: it acts as the common electrode for the display area pixels while simultaneously serving as the basis for the separate peripheral electrode structure. This multi-functionality reduces the need for entirely separate components and simplifies the overall device architecture
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 solution effectively reduces light leakage and improves display quality by achieving a higher optical density in the peripheral area, ensuring a consistent dark state and minimizing brightness differences between the display and peripheral regions.
Implementation Method 1
the liquid crystal molecules in the display area 102 are changed from a lying state 114 to a vertical state 112 by an up-and-down electric field effect
Implementation Method 2
The light from the backlight device first pass the lower polarizer, and then pass the vertical liquid crystal molecules 112 but do not pass the upper polarizer
Data Source
AI summary
A system for displaying images includes a liquid crystal display panel. The liquid crystal display panel comprises a color filter substrate having a light shielding layer on a peripheral area and a common electrode on a display area and the peripheral area, and an array substrate having a pixel electrode on the display area and a separate and independent electrode with a fixed voltage on the peripheral area. The liquid crystal display panel further comprises a liquid crystal layer between the color filter substrate and the array substrate.