Display Device Feedback Line Crosstalk Compensation
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Solution Overview
Problem
Display devices experience horizontal crosstalk due to changes in constant voltage caused by coupling between data lines and constant voltage lines, leading to incorrect light emission and luminance issues.
Innovation Solution
A display device with a feedback line coupled to the constant voltage line allows the display driver to sense changes in constant voltage and generate compensated image data, which are then provided to the pixels, reducing or eliminating horizontal crosstalk by adjusting the data voltages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data lines transfer data voltages to pixels, then image data is delivered to display, but coupling between data lines and constant voltage line causes constant voltage to change, resulting in horizontal crosstalk and incorrect luminance
Solution Approach 1:
The patent introduces a feedback mechanism where the display driver senses the actual constant voltage through a feedback line and generates compensated image data based on the sensed voltage change amount. This closed-loop feedback system automatically adjusts the image data to compensate for constant voltage fluctuations caused by coupling, thereby maintaining reliable display performance while preserving high-speed data transfer capability.
2Reliability
If the constant voltage line transfers constant voltage to pixels, then pixels receive stable voltage for proper operation, but coupling with data lines during voltage changes causes the constant voltage to fluctuate, leading to horizontal crosstalk
Solution Approach 1:
The feedback line enables the display driver to continuously monitor the constant voltage level and detect changes caused by coupling with data lines. Based on the detected change amount, the driver generates compensated image data that counteracts the voltage fluctuation effects, thereby eliminating horizontal crosstalk while maintaining stable pixel operation.
Solution Approach 2:
The patent dynamically adjusts the image data parameters (compensation values) based on the sensed constant voltage change amount. By changing the image data parameters in response to voltage fluctuations, the system compensates for the harmful effects of coupling and maintains correct luminance output despite constant voltage variations.
3Adaptability or versatility
If data voltages are changed to update image content, then display content is refreshed, but the coupling between data lines and constant voltage line induces constant voltage changes, causing luminance errors
Solution Approach 1:
During each frame update when data voltages change to refresh display content, the feedback line senses the resulting constant voltage changes. The display driver uses this feedback information to generate compensated image data that maintains luminance accuracy despite the voltage fluctuations induced by content updates.
Solution Approach 2:
The system dynamically modifies image data parameters by adding compensation values based on the sensed constant voltage change amount. This parameter adjustment ensures that luminance accuracy is maintained even as display content changes and data voltages fluctuate during operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces or eliminates horizontal crosstalk, ensuring that pixels emit light with desired luminance by compensating for voltage changes induced by data line coupling.
Implementation Method 1
the constant voltage may be changed by a coupling between data lines that transfer the data voltages and a constant voltage line that transfers the constant voltage
Data Source
AI summary
The present disclosure relates to a display device. The display device includes a display panel, data lines, a constant voltage line, a feedback line, and a display driver. The display panel includes pixels. The data lines transfer data voltages to the pixels. The constant voltage line transfers a constant voltage to the pixels. The feedback line is coupled to the constant voltage line. The display driver is configured to sense a change amount of the constant voltage through the feedback line, generate compensated image data by compensating image data according to the sensed change amount of the constant voltage, and provide the data voltages corresponding to the compensated image data to the pixels.