Scan Circuit Bidirectional Scanning Signal Timing
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Solution Overview
Problem
Existing OLED display panels with gate driver circuits cannot perform forward and backward scan functions effectively, leading to improper initialization and compensation of pixel circuits, resulting in abnormal image display during backward scanning.
Innovation Solution
A scan circuit with a switch control circuit and a gate driver circuit that outputs drive signals through signal output terminals, where the switch control circuit transmits the first scan signal followed by the second scan signal in both forward and backward directions, ensuring consistent initialization and compensation of pixel rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gate driver circuit scans backward, then the display can show content in backward direction, but the pixel circuits receive scan signals in wrong sequence causing initialization after compensation
Solution Approach 1:
The patent inverts the signal transmission path by introducing a switch control circuit that redirects scan signals. During backward scanning, the first scan signal is transmitted to the current row while the second scan signal is transmitted to the previous row, effectively reversing the signal flow sequence to match the reversed scanning direction and ensure proper initialization before compensation.
Solution Approach 2:
The switch control circuit acts as an intermediary between the gate driver circuit and the pixel circuits. It receives scan signals from the gate driver circuit and intelligently redistributes them to appropriate row electrodes based on scanning direction, ensuring that pixel circuits always receive initialization signals before compensation signals regardless of scanning direction.
2Productivity
If the gate driver circuit outputs drive signals sequentially to each row, then data can be written to pixel circuits, but during backward scan the same row receives compensation signal before initialization signal
Solution Approach 1:
The patent introduces dynamic signal routing through the switch control circuit that can change its behavior based on scanning direction. The circuit dynamically adjusts which row receives which scan signal depending on whether forward or backward scanning is active, maintaining precise timing relationships while accommodating bidirectional operation.
Data Source
AI summary
A scan circuit, a display panel, and a display device are provided. The scan circuit includes a switch control circuit in addition to a gate driver circuit with forward and backward scan functions, where the switch control circuit is configured to transmit a second scan signal to a corresponding row of pixels, and a first scan signal to its next row of pixel in a scan direction when the gate driver circuit outputs a drive signal at each of the signal output terminals. In this way, no matter whether the gate driver circuit performs forward or backward scanning, the switch control circuit controls the gate driver circuit to transmit firstly the first scan signal and then the second scan signal to the corresponding row of pixels.