TFT Drive Circuit Logic Compensation for Scan Signal Delay
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Solution Overview
Problem
Existing Thin Film Transistor (TFT) liquid crystal display devices suffer from delay distortion of scan signals due to series RC circuits, leading to degraded display quality, area flickering, and crosstalk, with existing scan line design schemes either simple but flawed or complex and power-intensive.
Innovation Solution
A TFT drive circuit with logic circuits connected to scan lines and control signal lines, where an enabling signal is loaded for a first preset duration and the output control signal is inverted for a second preset duration to improve the voltage level of the scan signal, reducing delay distortion by managing the voltage level of the enabling signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If unilateral driving is used for scan lines, then the circuit design is simple, but delay distortion occurs in the scan signal
Solution Approach 1:
A compensation circuit is introduced as an intermediary component between the scan signal source and the display panel. This compensation circuit receives the scan signal and generates a compensated scan signal by adding a leading edge, thereby mediating the delay distortion caused by the scan line's series RC circuit without requiring complex bilateral or interlaced driving schemes
Solution Approach 2:
The patent changes the temporal parameters of the scan signal by adding a leading edge (pre-charging the scan line before the actual scan signal). This parameter modification compensates for the delay distortion that occurs during signal transmission through the scan line's series RC circuit
2Manufacturing precision
If bilateral driving is used for scan lines, then delay distortion is improved, but power consumption increases and reliability decreases
Solution Approach 1:
The patent extracts the compensation function from the complex bilateral driving scheme and implements it through a dedicated compensation circuit that adds only a leading edge to the scan signal. This approach achieves delay distortion compensation without requiring the complex bidirectional signal transmission and synchronization mechanisms of bilateral driving, thereby reducing power consumption and improving reliability
3Ease of manufacture
If the scan signal is transmitted through series RC circuits, then the scan line can be formed, but delay distortion and area flickering occur
Solution Approach 1:
The compensation circuit performs preliminary action by adding a leading edge to the scan signal before it is transmitted through the scan line's series RC circuit. This pre-charging action ensures that the scan line is already at the correct voltage level when the actual scan signal arrives, preventing delay distortion and area flickering while maintaining the simplicity of the scan line structure
Data Source
AI summary
The invention discloses a thin film transistor drive circuit and a drive method thereof and a liquid crystal display device. The thin film transistor drive circuit includes a plurality of scan lines, a scan signal output port configured to sequentially apply a scan signal to each of the scan lines, and a plurality of logic circuits. Each of the logic circuits is connected with one of the scan lines and a control signal line. The logic circuits are added to a drive circuit, and an input control signal corresponding to a truth table of the logic circuit is input for a preset duration by using a logic relationship of the logic circuit, so that an output control signal output to a scan line can be obtained to improve a scan signal on the scan line, to improve a delay distortion at the time of being turned off.