Liquid Crystal Display Light Blocking Member Design
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Solution Overview
Problem
Liquid crystal displays face issues with light leakage due to arrangement errors and performance degradation of thin film transistors, particularly in vertically aligned mode displays, where light blocking members are not effectively positioned to prevent leakage and maintain transistor performance.
Innovation Solution
A liquid crystal display design that includes a color filter and light blocking members on the thin film transistor array panel, with a second light blocking member extending along the gate line to cover the transistors and overlap with the first light blocking member, effectively preventing light leakage and maintaining transistor performance without additional thin film compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking member is disposed on the thin film transistor array panel to prevent light leakage, then light leakage due to arrangement error is prevented, but the performance characteristic of the thin film transistor deteriorates due to additional thin film
Solution Approach 1:
The light blocking member is divided into two separate members: a first light blocking member disposed on the data line to prevent light leakage, and a second light blocking member disposed on the color filter to block light from reaching the thin film transistor. This segmentation allows each light blocking member to be positioned optimally for its specific function without compromising transistor performance.
Solution Approach 2:
The second light blocking member acts as an intermediary element positioned between the color filter and the thin film transistor. It mediates the light path to prevent light from reaching the transistor while not directly contacting or adding thickness to the transistor structure itself, thus protecting transistor performance.
2Object-affected harmful factors
If the light blocking member is provided on the thin film transistor array panel, then light leakage is prevented, but the thin film transistor cannot be efficiently repaired during manufacturing
Solution Approach 1:
By separating the light blocking function into two distinct members, the first light blocking member on the data line can be maintained for light leakage prevention, while the second light blocking member on the color filter can be selectively removed or modified during manufacturing to allow transistor repair access.
Solution Approach 2:
The light blocking structure is optimized locally: the first light blocking member maintains full coverage on the data line for continuous light leakage prevention, while the second light blocking member on the color filter provides localized light blocking that can be selectively adjusted or removed in specific repair areas without compromising overall light leakage prevention.
3Object-affected harmful factors
If a color filter and light blocking member are disposed on the thin film transistor array panel, then light leakage due to arrangement error is prevented, but the device complexity increases
Solution Approach 1:
The second light blocking member disposed on the color filter serves multiple functions: it blocks light from reaching the thin film transistor, provides structural support in the display panel, and can be integrated with the color filter manufacturing process. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The light blocking function is merged with existing panel structures: the first light blocking member is integrated with the data line structure, and the second light blocking member is combined with the color filter assembly. This merging approach avoids adding completely separate components and reduces overall 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
The design effectively prevents light leakage and maintains the performance characteristics of thin film transistors by positioning light blocking members to cover the transistors, thereby improving the contrast ratio and side visibility of the display.
Implementation Method 1
a light blocking member is disposed at a position where a thin film transistor or the like is disposed to effectively prevent leakage current of a channel layer due to light
Implementation Method 2
when both a color filter and the light blocking member are disposed on a thin film transistor array panel, light leakage due to arrangement error of two display panels, which may occur in the case where the color filter and the light blocking member are disposed on a common electrode display panel, may be effectively prevented
Data Source
AI summary
A liquid crystal display includes: a first insulation substrate; a gate line disposed on the first insulation substrate; a first data line and a second data line disposed on the first insulation substrate; a color filter disposed on the first insulation substrate and disposed between the first data line and the second data line; a first light blocking member disposed on the first data line and the second data line; and a second light blocking member disposed on the color filter and the first light blocking member, extending in the same direction as the gate line, and overlapping the first light blocking member on the first data line and the second data line.