LCD Data Line Repair Using Overdrive Look-Up Table
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Solution Overview
Problem
The existing methods for repairing defect lines in LCD panels result in longer repair lines that increase RC loading, leading to longer voltage response times and uneven display images due to the need for external PCBA and repair operational amplifiers.
Innovation Solution
A data line repair apparatus and method utilizing an overdrive look-up table module that receives image data, acquires corresponding relationships between former and present frame data, and outputs voltage to the repair operational amplifier in a scheduled period to reduce RC loading and shorten voltage response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the repair line routes around the whole panel width to connect defect data lines, then the defect line can be repaired, but the RC loading increases and voltage response time becomes longer
Solution Approach 1:
The patent applies overdrive signals in advance to pre-charge the repair line before actual data transmission. The overdrive look-up table module calculates and applies compensation voltages based on previous frame data, reducing the RC loading effect and enabling faster voltage response during normal operation.
Solution Approach 2:
The patent changes the voltage parameter by applying overdrive signals with different voltage levels than normal data signals. The system dynamically adjusts the voltage applied to the repair line based on the difference between current and previous frame data, effectively reducing RC loading effects and shortening response time.
2Reliability
If the repair line routes around the whole panel width, then connectivity is achieved, but display image uniformity deteriorates due to larger RC loading
Solution Approach 1:
The patent dynamically changes the voltage parameter applied to the repair line by using overdrive signals. The overdrive look-up table module calculates compensation voltages based on frame differences, adjusting the voltage level to compensate for RC loading effects and ensure uniform display image quality across the panel.
Solution Approach 2:
The system uses feedback from previous frame data stored in the look-up table to continuously adjust the overdrive signal applied to the repair line. This feedback mechanism ensures that the repair line maintains optimal performance and display uniformity by compensating for RC loading effects in real-time.
Data Source
AI summary
Disclosed are a data line repair apparatus and a method thereof, employed in a LCD panel having a repair line, and a repair operational amplifier coupled to the LCD panel including a first input end, a second input end and an output end, and the output end and the second input end are both coupled to a data line of the LCD panel and the repair line. The data line repair apparatus comprises a receiving module, receiving image data of a present frame from the data line; an acquiring module, acquiring output data corresponding to the image data of the present frame and image data of a former frame from preserved corresponding relationships of the aforesaid data; and an outputting module, outputting a voltage corresponding to the output data acquired by the acquiring module to the first input end in a scheduled period.