Active Matrix Substrate Transparent Electrode Aperture Ratio
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Solution Overview
Problem
The aperture ratio of sub-pixels in active matrix liquid crystal display panels is limited due to the presence of light shielding gate lines, leading to suboptimal image quality and increased power consumption.
Innovation Solution
The configuration includes an auxiliary capacitor with a transparent electrode, pixel electrode, and capacitor insulating film, where switching elements are connected to different source lines for each pair of sub-pixels, and transparent electrodes are shared between adjacent sub-pixels, allowing for reduced light shielding and improved aperture ratio without the need for frequent polarity inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light shielding gate lines are provided to cross the center section of each sub-pixel, then switching elements can be properly positioned, but the aperture ratio of each sub-pixel deteriorates
Solution Approach 1:
The patent moves capacitor lines from the horizontal direction (parallel to gate lines) to the vertical direction (perpendicular to gate lines). This dimensional change allows capacitor lines to pass through wide spaces between gate lines without requiring additional light shielding structures, thereby improving aperture ratio while maintaining proper switching element positioning.
Solution Approach 2:
The gate lines serve dual functions: as switching control lines and as structural references for positioning capacitor lines in the vertical direction. The wide spaces between gate lines are utilized as routing channels for capacitor lines, making the gate line arrangement serve multiple purposes in the overall circuit layout.
2Reliability
If capacitor lines are provided for each gate line, then auxiliary capacitors can be properly formed, but the number of capacitor lines increases leading to reduced aperture ratio
Solution Approach 1:
Adjacent capacitor lines that serve neighboring sub-pixels are merged into single shared capacitor lines. Each capacitor line is positioned in a wide space between gate lines and serves multiple sub-pixels, reducing the total number of capacitor lines from being equal to the number of gate lines to being significantly fewer, thereby improving aperture ratio while maintaining proper auxiliary capacitor formation.
3Reliability
If polarity inversion is performed frequently to reduce image degradation, then image quality improves, but panel driving power increases
Solution Approach 1:
The patent extracts the polarity inversion requirement from the driving scheme by providing auxiliary capacitors with proper charge retention. The auxiliary capacitors maintain charge during periods when polarity inversion is not performed, allowing the display to operate with reduced polarity inversion frequency, thereby lowering driving power while maintaining image quality.
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 aperture ratio, reduces image degradation, and decreases panel driving power by minimizing the number of capacitor lines and optimizing voltage application, resulting in improved display quality and reduced power consumption.
Implementation Method 1
an auxiliary capacitor of each of sub-pixels includes a transparent electrode, a pixel electrode, and a capacitor insulating film provided between the transparent electrode and the pixel electrode
Data Source
AI summary
An auxiliary capacitor (6) of each of sub-pixels (P) includes a transparent electrode, a pixel electrode, and a capacitor insulating film between the transparent electrode and the pixel electrode. Switching elements (5a) are connected, for every predetermined sub-pixel(s) (P) along a column direction of the sub-pixels (P) arranged in rows and columns, to the source lines (15a) different from each other. A plurality of transparent electrodes are each shared by a pair of the sub-pixels (P) which are adjacent to each other in a predetermined direction and are arranged in a corresponding one of the wide spaces each provided between adjacent two of gate lines (13). The transparent electrodes adjacent to each other in the row direction receive different signals.