Display Panel Gate Shift Timing Compensation
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Solution Overview
Problem
In display apparatuses, the propagation delay of data voltage can lead to insufficient charging rates of pixels, resulting in deteriorated display quality if the gate shift value for delaying the gate signal is not accurately determined.
Innovation Solution
A display apparatus and method that determine a gate shift value by considering a compensation image, allowing for accurate shifting of the gate signal output time to enhance pixel charging rates and display quality, involving a driving controller that inserts a compensation image into the image data to generate second image data and adjusts the gate signal timing based on data and compensation counting values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gate shift value is determined without considering propagation delay, then the gate signal timing is simple to control, but the pixel charging rate becomes insufficient and display quality deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating the gate shift value based on the known propagation delay characteristics of the data lines before actual image display. The driving controller determines the appropriate gate shift value in advance by considering the distance between data driver and pixels, and by using compensation images during initialization to measure actual propagation delays. This pre-determined gate shift value is then applied during normal operation, avoiding the need for complex real-time adjustments while ensuring accurate pixel charging timing.
2Productivity
If the gate shift value is increased to compensate for propagation delay, then the pixel charging rate improves, but the timing synchronization between gate signal and data voltage becomes difficult to maintain
Solution Approach 1:
The patent implements feedback by using compensation images during an initialization phase to measure the actual propagation delay in the data lines. The driving controller applies a gate signal with a predetermined shift value during this phase, displays the compensation image, and measures the actual timing characteristics. Based on this measured feedback information, the controller optimizes the gate shift value to achieve the best synchronization between gate signals and data voltages. This feedback mechanism ensures that the gate shift value accurately compensates for propagation delay while maintaining proper timing synchronization.
Data Source
AI summary
A display apparatus includes a display panel, a driving controller, a gate driver and a data driver. The driving controller is configured to insert a compensation image to first image data including a normal image to generate second image data. The gate driver is configured to shift an output time of a gate signal and to output the gate signal having a shifted output time to the display panel. The data driver is configured to generate a data voltage based on the second image data and to output the data voltage to the display panel. A gate shift amount when the compensation image is applied is substantially the same as a gate shift amount immediately before the compensation image is applied.