Liquid Crystal Display Gate Line Scan Signal Distribution
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Solution Overview
Problem
Conventional liquid crystal displays suffer from nonuniform luminance due to waveform distortion of scan signals, resulting in varying brightness across the frame, which degrades image quality.
Innovation Solution
A liquid crystal display structure where the scan signal is inputted at the middle of the gate line and transmitted to both extremities, ensuring that thin film transistors near the extremities have similar turn-on times, thereby minimizing waveform distortion and achieving uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the scan signal is transmitted along a conventional scan line to the gate line, then the pixel circuit can be driven, but waveform distortion occurs due to RC effect causing nonuniform luminance
Solution Approach 1:
The gate line is divided into two segments: a first gate line segment from the first extremity to the electrical contact, and a second gate line segment from the electrical contact to the second extremity. The scan line is also segmented with a first scan line segment and a second scan line segment meeting at the electrical contact. This segmentation allows the scan signal to be distributed to both gate line segments simultaneously, reducing the transmission distance and minimizing RC effect-induced waveform distortion.
Solution Approach 2:
The patent introduces a new dimensional approach by adding an electrical contact that branches the signal path. Instead of a single linear transmission path, the signal is distributed in a T-shaped or Y-shaped configuration, effectively adding a spatial dimension to the signal distribution network. This reduces the maximum transmission distance from the full gate line length to approximately half that length, minimizing waveform distortion.
2Ease of operation
If the scan signal travels a long distance along the scan line, then all pixels can be addressed, but signal distortion increases causing different turn-on times for pixels at different positions
Solution Approach 1:
The gate line is divided into two segments meeting at a central electrical contact, allowing the scan signal to be distributed to both segments simultaneously. This reduces the maximum transmission distance and ensures that pixels at both extremities of the gate line receive the scan signal at approximately the same time, improving turn-on time consistency across all pixels.
Solution Approach 2:
The electrical contact serves as an intermediary node that receives the scan signal from the scan line and distributes it to both the first and second gate line segments. This intermediary structure enables simultaneous signal distribution to both gate line segments, ensuring uniform signal arrival time at pixels located at opposite extremities of the gate line.
3Device complexity
If the scan signal is input at one end of the gate line, then the circuit structure is simple, but pixels at the far end receive distorted signals with insufficient charging time
Solution Approach 1:
The gate line is segmented into two equal or approximately equal segments from the electrical contact to each extremity. This segmentation ensures that the scan signal travels equal distances to reach pixels at both ends of the gate line, providing uniform charging time to the liquid crystal capacitors and storage capacitors across all pixels in the row.
Solution Approach 2:
The patent introduces a branching structure at the electrical contact that adds a spatial dimension to the signal distribution. Instead of a single linear path, the signal is distributed along two parallel paths of equal length, ensuring that pixels at both extremities receive the scan signal simultaneously with adequate charging time.
Data Source
AI summary
A liquid crystal display and a liquid crystal display panel thereof. Gates on thin film transistors serving as switches in the same row of pixels are coupled with a gate line. A scan signal is substantially inputted to a middle of the gate line and transmitted to two extremities of the gate line, so that the two thin film transistors, which are coupled with the two extremities of the gate line have substantially the same time for turning on/off. Namely, the pulse waveforms of scan signals received by the two pixels, which are spaced apart by a longest distance, are substantially the same.