Thin Film Transistor Array Panel with Inclined Branch Electrodes
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Solution Overview
Problem
As liquid crystal displays increase in size, erroneous alignment of display panels during manufacturing can lead to deterioration of contrast ratio and mixed color phenomena, which is compensated by increasing the width of the black matrix, thereby decreasing the aperture ratio of pixels.
Innovation Solution
A thin film transistor array panel design featuring a substrate with gate lines, data lines, thin film transistors, color filters, a common electrode, and pixel electrodes, where the pixel electrodes have branch electrodes inclined at an angle and a passivation layer that covers the common electrode's opening, maintaining the aperture ratio while preventing erroneous alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the width of the black matrix is increased to compensate for erroneous alignment, then alignment tolerance is improved, but the aperture ratio of pixels decreases
Solution Approach 1:
The invention introduces a new dimensional approach by forming color filters on upper parts of gate lines, data lines, and thin film transistors rather than only in pixel areas. This spatial redistribution maintains aperture ratio while providing alignment tolerance through the extended color filter coverage that compensates for panel misalignment.
Solution Approach 2:
The color filters are selectively positioned on upper parts of specific structures (gate lines, data lines, and thin film transistors) rather than uniformly across the entire panel. This localized placement optimizes the balance between maintaining aperture ratio in pixel areas and providing alignment compensation in non-pixel areas.
2Illumination intensity
If the aperture ratio is maintained, then light transmittance is improved, but alignment tolerance deteriorates
Solution Approach 1:
By extending color filter formation to upper parts of gate lines, data lines, and thin film transistors, the invention creates an additional spatial dimension for alignment compensation. This allows the pixel aperture area to remain large for high light transmittance while the extended color filter regions provide the necessary alignment tolerance.
3Adaptability or versatility
If branch electrodes are inclined at an angle, then viewing angle is improved, but electrode complexity increases
Solution Approach 1:
The pixel electrodes are designed with branch electrodes that are asymmetrically inclined at specific angles rather than being symmetric or perpendicular. This asymmetric configuration optimizes light viewing angles in different directions while the inclination angle is carefully selected to balance performance improvement with manufacturing feasibility.
Data Source
AI summary
A thin film transistor array panel includes a substrate; a plurality of gate lines that are formed on the substrate; a plurality of data lines that intersect the gate lines; a plurality of thin film transistors that are connected to the gate lines and the data lines; a plurality of color filters that are formed on upper parts of the gate lines, the data lines, and the thin film transistors; a common electrode that is formed on the color filters and that includes a transparent conductor; a passivation layer that is formed on an upper part of the common electrode; and a plurality of pixel electrodes that are formed on an upper part of the passivation layer and that are connected to a drain electrode of each of the thin film transistors.