Broken Scanning Lines for Display Signal Delay and Short Circuit Prevention
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Solution Overview
Problem
Existing liquid crystal display devices face issues with signal delay and potential short circuits due to the timing mismatch between drive signal pulses from the first and second scanning circuits, especially as the number of scanning lines increases, leading to potential display output failures.
Innovation Solution
The display device incorporates a configuration with broken scanning lines and a specific timing control for the first and second scanning circuits, ensuring the pixel and common electrodes become equipotential before inversion drive, stabilizing the potential difference and preventing signal delay and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of scanning lines is increased to improve display resolution, then the display quality is improved, but signal delay of drive signal pulses occurs and short circuit between first and second scanning circuits may occur
Solution Approach 1:
The scanning lines are divided into two groups: first scanning lines driven by the first scanning circuit and second scanning lines driven by the second scanning circuit. This segmentation allows independent timing control for each group, preventing signal delay and short circuit issues while maintaining high display resolution through increased total scanning line count.
2Reliability
If inversion drive is performed to maintain pixel potential stability, then display output reliability is improved, but timing mismatch between first and second scanning circuits causes short circuit
Solution Approach 1:
The pixel electrode and common electrode are set to be equipotential right before the inversion drive timing. This preliminary action ensures that when inversion drive occurs, there is no potential difference that could cause short circuit, while still maintaining the stability benefits of inversion drive.
3Reliability
If the timing of drive signal pulses from first and second scanning circuits is shifted to prevent short circuit, then short circuit risk is reduced, but signal delay occurs
Solution Approach 1:
By segmenting the scanning lines into two independently controlled groups, the system can apply drive signal pulses at different timings to each group without causing short circuits. The first scanning circuit drives first scanning lines at one timing, while the second scanning circuit drives second scanning lines at a different timing, eliminating both short circuit risk and signal delay.
Data Source
AI summary
A display device includes a plurality of scanning lines extending in a first direction, a plurality of signal lines extending in a direction intersecting the first direction, a first scanning circuit coupled to first coupling end parts of the scanning lines, a second scanning circuit coupled to second coupling end parts of the scanning lines, the second coupling end parts being opposite the first coupling end parts of the scanning lines, the first coupling end parts coupled to the first scanning circuit, and a signal output circuit configured to supply image signals to the signal lines. The scanning lines each have a broken part.