Signal Compensation for LCD Gate Drive Impedance
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Solution Overview
Problem
Inconsistent drive capabilities of gate drive circuits in liquid crystal display panels due to varying wire impedances lead to horizontal stripes in the display, affecting display quality.
Innovation Solution
A signal compensation system comprising a level conversion module, a determination module, and a compensation module that adjusts the output voltage of control signals based on calculated compensation coefficients to ensure consistent voltages at each gate, addressing the impedance differences caused by varying wire lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wires of different lengths are used to connect drive circuits to gates on the substrate, then the drive circuit can cover more gates, but the impedances of the wires become different causing inconsistent drive capabilities
Solution Approach 1:
The patent applies local quality by assigning different compensation coefficients to different wire groups based on their specific impedance characteristics. The compensation module adjusts output voltages locally for each gate according to its corresponding wire's impedance, rather than using a uniform compensation approach. This resolves the contradiction by allowing the drive circuit to cover more gates with varying wire lengths while maintaining consistent drive capabilities through localized impedance compensation.
2Productivity
If wire lengths are made inconsistent to accommodate more gates, then productivity increases, but horizontal stripes appear due to inconsistent drive capabilities
Solution Approach 1:
The patent implements preliminary anti-action by pre-calculating and applying compensation coefficients to counteract the impedance effects of wires with different lengths before the control signals are transmitted to the gates. The compensation module proactively adjusts the output voltages based on the known wire characteristics, preventing the formation of horizontal stripes before they can occur. This allows the system to maintain high productivity with varied wire lengths while eliminating the harmful display artifacts.
3Ease of manufacture
If external ICs are replaced with GOA technology, then production cost decreases, but wire impedance variations cause drive capability inconsistency
Solution Approach 1:
The patent applies feedback by using the detected target row number information to determine appropriate compensation coefficients, which are then fed back to adjust the output voltages of the drive circuit. This closed-loop approach ensures that despite the wire impedance variations inherent in GOA technology, the drive capability remains consistent across all gates. The feedback mechanism maintains reliability while preserving the cost advantages of GOA technology.
Data Source
AI summary
The present application provides a signal compensation system, which includes a level conversion module, a determination module and a compensation module. The level conversion module is for receiving a timing signal and converting the timing signal into a control signal. The determination module is for detecting a target row number of a gate corresponding to the control signal and determining a compensation coefficient according to the target row number. The compensation module is for compensating an output voltage of the control signal according to the compensation coefficient, thereby voltages at gates are consistent when the control signal is sent to each of the gates. The present application also provides a signal compensation method.