Display Signal Delay Compensation via Non-Linear Voltage Adjustment
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Solution Overview
Problem
Large-scale display panels with high-resolution displays face signal delay issues due to increased line resistance, leading to degraded display quality as the distance between the signal source and the driver increases, causing differences in target and actual grayscale across the display device.
Innovation Solution
A display apparatus with a compensating circuit and voltage generating circuit that non-linearly vary gate-on and gate-off voltages over time, preventing signal distortion and improving driving reliability and display quality by maintaining constant voltage levels across the display panel regardless of position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel is made large-scale with high-resolution, then the display quality and resolution are improved, but the line resistance of signal lines increases causing signal delay
Solution Approach 1:
The patent applies preliminary action by generating compensation signals in advance that predict and counteract the signal delay effects. The compensation signals are generated based on expected delay characteristics before the actual signal transmission occurs, allowing the system to pre-correct for the anticipated signal degradation in large-scale display panels.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the compensation signal parameters (such as voltage levels and timing) based on the position-dependent signal delay characteristics. The compensation circuit modifies signal parameters to counteract the increased line resistance effects in large-scale panels, transforming the fixed signal characteristics into adaptive ones that compensate for scale-related delays.
2Length of stationary object
If the distance between signal supply source and driver increases, then the signal delay time increases, but the target grayscale and actual grayscale become different
Solution Approach 1:
The patent applies local quality by implementing position-dependent compensation signals that are tailored to specific regions of the display panel. Different compensation parameters are applied to different local areas based on their distance from the signal source, ensuring that each region receives appropriate correction for its specific delay characteristics, thereby maintaining grayscale accuracy across the entire large-scale panel.
Solution Approach 2:
The patent implements feedback mechanisms where the compensation circuit continuously monitors and adjusts compensation signals based on the actual signal delay effects observed. This closed-loop approach allows the system to refine compensation parameters in response to measured grayscale differences, improving accuracy over time and adapting to variations in signal transmission characteristics.
3Reliability
If the signal delay increases according to position, then the gate signal becomes distorted, but the driving reliability and display quality are degraded
Solution Approach 1:
The patent applies preliminary action by pre-generating compensation signals that anticipate and prevent gate signal distortion before it occurs. The compensation circuit prepares corrected signals in advance based on known delay characteristics, ensuring that distorted gate signals are replaced with pre-corrected versions that maintain proper timing and voltage levels throughout the display panel.
Data Source
AI summary
A display apparatus includes a controller which generates control signals and outputs image data, a compensating circuit which receives a portion of the control signals from the controller and generates a compensation signal, a voltage generating circuit which converts an input voltage to a driving voltage and increases or decreases a voltage level of the driving voltage in a frame period in response to the compensation signal, a driving part which receives the control signals and the image data from the controller and receives the driving voltage from the voltage generating circuit to generate a panel driving signal, and a display panel which receives the panel driving signal from the driving part to display an image.