Display Device Data Line Load Sensing and Timing Control
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Solution Overview
Problem
In display devices, the delay time of data signals to pixels increases with distance from the data driver, leading to a decrease in pixel voltage charging rate and deteriorated display quality due to increased distance from the data driver.
Innovation Solution
A display device with a dummy data unit at one end of the data line and a sensing unit at the opposing end, which determines the data line load using a dummy data signal, and a timing controller that adjusts the supply timing of the data signal based on this load to ensure proper pixel voltage charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the data line length increases to cover larger display areas, then the display area is improved, but the delay time of data signal increases and charging rate decreases
Solution Approach 1:
The patent applies preliminary action by sending a dummy data signal through the data line before the actual data signal to measure and calculate the data line load in advance. Based on this pre-measured load, the system determines the appropriate delay time and adjusts the supply timing of the data signal accordingly, ensuring that pixels at different distances from the data driver receive data at the optimal time for complete charging.
2Area of stationary object
If the data line length increases to cover larger display areas, then the display area is improved, but the charging rate of pixel voltage decreases
Solution Approach 1:
The system performs preliminary measurement by sending a dummy data signal through the data line to calculate the data line load before actual data transmission. Based on this pre-calculated load information, the timing controller adjusts the supply timing of the data signal to ensure that pixels receive sufficient charging time regardless of their distance from the data driver, thereby maintaining adequate charging rate across the entire display area.
3Reliability
If the data signal supply timing is adjusted to compensate for distance, then the display quality is improved, but the system complexity increases
Solution Approach 1:
The patent implements feedback by using the dummy data signal to measure the actual data line load, calculating the delay time based on this measured load, and then adjusting the data signal supply timing accordingly. This closed-loop feedback mechanism ensures that the system automatically compensates for variations in data line characteristics, maintaining high display quality without requiring manual calibration or complex external adjustment mechanisms.
Data Source
AI summary
A display device includes: a dummy data unit connected to one end portion of a data line, where the dummy data unit supplies a dummy data signal to the data line; a sensing unit connected to an opposing end portion of the data line, where the sensing unit determines a load of the data line based on the dummy data signal supplied thereto through the data line; and a timing controller which controls a supply timing of a data signal to be supplied to the data line, based on the load.