Liquid Crystal Display Storage Capacitor Integration
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Solution Overview
Problem
Liquid crystal displays face challenges in maintaining a high contrast ratio and aperture ratio due to misalignment between display panels and the formation of storage capacitors, which reduces color reproducibility and increases the complexity of the display.
Innovation Solution
The solution involves forming light blocking members on the thin film transistor array panel, which function as both light blocking and storage electrodes, overlapping with pixel electrodes and an interlayer insulating layer to create storage capacitors, thereby reducing alignment errors and increasing the aperture ratio while maintaining a high contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a storage electrode is formed to increase the capacitance of a storage capacitor, then the capacitance is improved, but the aperture ratio is decreased
Solution Approach 1:
The invention merges the light blocking member and storage electrode into a single integrated structure. The light blocking member is formed to overlap with the pixel electrode, creating both light blocking functionality and storage capacitor functionality simultaneously. This eliminates the need for a separate storage electrode that would further reduce aperture ratio, as the storage electrode function is combined with the existing light blocking structure.
Solution Approach 2:
The light blocking member is given multiple functions: it blocks light from non-controlled regions to improve contrast ratio, and simultaneously serves as the storage electrode to maintain pixel voltage. By making the light blocking member multi-functional, the invention avoids adding extra structures that would reduce aperture ratio while still achieving both light blocking and voltage storage requirements.
2Ease of manufacture
If misalignment between pixel electrodes and color filters occurs during assembly, then manufacturing complexity is reduced, but color reproducibility and contrast ratio are decreased
Solution Approach 1:
The invention moves the light blocking function from the opposite panel (where alignment precision is critical) to the same panel as the pixel electrodes. By forming the light blocking member on the same panel that contains the pixel electrodes, the alignment reference is established in one dimension rather than requiring precise alignment between two separate panels, thereby reducing the impact of assembly misalignment on color reproducibility and contrast ratio.
3Illumination intensity
If light blocking members are formed around pixel boundaries, then contrast ratio is improved, but alignment error between panels increases the risk of decreased color reproducibility
Solution Approach 1:
The invention combines the light blocking member formation with the pixel electrode structure on the same panel. The light blocking member is formed to overlap with the pixel electrode, ensuring that the light blocking function is precisely aligned with the pixel boundaries without requiring high-precision alignment between separate panels. This maintains high contrast ratio while eliminating the alignment error problem between panels.
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 voltage maintaining ability of liquid crystal capacitors, improves color reproducibility, and increases the aperture ratio by effectively forming storage capacitors and preventing light leakage, thus addressing the issues of misalignment and capacitance in liquid crystal displays.
Implementation Method 1
Field generating electrodes generate an electric field of varying intensity thereby varying the arrangement of liquid crystal molecules and changing the polarization of light passing through the liquid crystal layer
Implementation Method 2
the liquid crystal layer, which is an electro-optic active layer, is charged and the charge is maintained until the next time that a gate-on voltage is applied
Implementation Method 3
A storage capacitor reduces the range of the fluctuation to maintain the pixel voltage constantly
Implementation Method 4
light blocking members block light that passes through portions of the liquid crystal layer that are not controlled by pixel electrodes to improve the contrast ratio
Data Source
AI summary
A liquid crystal display is provided with a first substrate, a color filter formed on the first substrate, a first electrode formed on the color filter, an interlayer insulating layer formed on the first electrode, a light blocking member formed on the interlayer insulating layer and partially overlapping the first electrode, a second substrate facing the first substrate, a second electrode formed on the second substrate, and a liquid crystal layer interposed between the first and second substrates, wherein the light blocking member and the first electrode may be overlap each other, with the interlayer insulating layer interposed therebetween to form a storage capacitor.