Overlapping Color Filters Prevent Light Leakage in IPS LCDs
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Solution Overview
Problem
In IPS mode LCD devices, misalignment between the array substrate and the color filter substrate leads to color mixture defects due to the absence of a black matrix, which reduces the aperture ratio and degrades display quality.
Innovation Solution
The adjacent color filters on the color filter substrate overlap each other with a controlled overlapping width, effectively preventing light leakage from non-display regions without the need for a black matrix, thereby maintaining a high aperture ratio and preventing color mixture even during misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a black matrix is used to prevent color mixture defects, then display quality is improved, but aperture ratio is reduced
Solution Approach 1:
The invention extracts and eliminates the black matrix component from the display structure by using overlapping color filters instead, thereby removing the element that blocks light and reduces aperture ratio while still achieving the function of preventing color mixture defects
Solution Approach 2:
The invention merges the functions of the black matrix (light blocking) and color filters (color separation) by making the color filters overlap each other, so that the color filters themselves perform the light blocking function previously requiring a separate black matrix component
2Area of stationary object
If the aperture ratio is increased by removing the black matrix, then light transmission is improved, but color mixture defects occur due to misalignment
Solution Approach 1:
The invention applies preliminary anti-action by designing the color filters to overlap each other in advance, creating a preventive measure against misalignment before it occurs, so that even if substrates shift during assembly, the overlapping region prevents light leakage and color mixture defects
Solution Approach 2:
The overlapping configuration of color filters is established during the manufacturing process as a preliminary action, creating a built-in tolerance mechanism that proactively addresses potential misalignment issues before the display is assembled and used
3Object-affected harmful factors
If a black matrix is used to block light from non-display regions, then light leakage is prevented, but the device complexity increases
Solution Approach 1:
The color filters are given multiple functions: they perform their primary role of color separation while simultaneously serving as light blocking elements for non-display regions through their overlapping configuration, eliminating the need for a separate black matrix structure
Solution Approach 2:
The invention merges the light blocking function previously performed by the black matrix with the color filtering function, so that the overlapping color filters themselves block light from non-display regions, reducing the number of separate components needed
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 solution ensures that color mixture defects are minimized, maintaining high display quality and aperture ratio, even with misalignment, by overlapping adjacent color filters to shield light from non-display regions, and allows for a sufficient aperture ratio without using a black matrix.
Implementation Method 1
an LCD device includes two substrates that are spaced apart and face each other with a liquid crystal material interposed between the two substrates
Implementation Method 2
Alignment of the liquid crystal molecules in the liquid crystal material changes in accordance with the intensity of the induced electric field into the direction of the induced electric field, thereby changing the light transmissivity
Implementation Method 3
The color filter layer 116 includes red, green and blue color filters 116a, 116b and 116c corresponding to the red, green and blue sub-pixel regions
Data Source
AI summary
A liquid crystal display device includes an array substrate including gate and data line on a first substrate to define first and second sub-pixel regions and a thin film transistor in each of the first and second sub-pixel regions; a color filter substrate including a color filter layer including first and second color filters corresponding to the first and second sub-pixel regions, respectively, a portion of the first color filter overlapping a portion of the second color filter over the data line; and a liquid crystal layer between the array substrate and the color filter substrate.