Pixel Illumination Compensation for Display Devices
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Solution Overview
Problem
In electroluminescent display panels, the accuracy of data voltage compensation is compromised due to coupling capacitance between detection lines, leading to inaccurate display effects.
Innovation Solution
A pixel compensation method and apparatus that alternately charge detection lines for sub-pixel columns during specific display frames to isolate and determine accurate detection voltages, eliminating the influence of coupling capacitance by charging one column with an additional voltage in one frame and not in the next, allowing for precise calculation of detection voltages for each sub-pixel column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If detection lines are charged simultaneously for all sub-pixel columns, then the compensation process is completed faster, but the detected voltages become inaccurate due to coupling capacitance interference
Solution Approach 1:
The patent divides the detection process into separate stages for different sub-pixel columns (first sub-pixel column and second sub-pixel column). During each stage, only one column is charged and detected while others remain uncharged, eliminating coupling capacitance interference. This segmentation enables accurate voltage detection for each column independently.
Solution Approach 2:
The patent implements periodic alternating charging of different sub-pixel columns across multiple display frames. In odd frames, the first column is charged; in even frames, the second column is charged. This periodic action allows systematic measurement of each column's voltage characteristics while maintaining temporal separation to avoid interference.
2Productivity
If detection is performed during active display frames, then the process is more efficient, but display quality deteriorates due to coupling capacitance effects
Solution Approach 1:
The patent performs voltage detection and compensation measurements during blanking periods before the actual display content is rendered. By conducting detection operations in advance during these idle periods, the system obtains accurate voltage data without interfering with the subsequent display quality, ensuring both efficiency and reliability.
3Reliability
If all sub-pixel columns are charged with additional voltage simultaneously, then the compensation coverage is more complete, but the voltage measurements become inaccurate due to mutual coupling effects
Solution Approach 1:
The patent extracts and measures the coupling capacitance effect separately by charging one sub-pixel column while keeping others uncharged. This isolation technique allows the system to detect the pure coupling voltage without the confounding influence of other columns being charged, enabling accurate separation and compensation of coupling effects.
Solution Approach 2:
The patent applies different charging states to different sub-pixel columns at different times. During each detection stage, only the target column receives additional charging voltage while other columns maintain their normal state. This local differentiation enables precise measurement of each column's characteristics and coupling effects independently.
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
This approach improves the accuracy of detected voltages and data voltages for sub-pixels, enhancing the display effect by eliminating the impact of coupling capacitance on voltage measurements.
Implementation Method 1
coupling capacitance between detection lines
Data Source
AI summary
A pixel compensation method, pixel compensation apparatus and display device are provided. In the blanking section of (2n−1)th display frame, the detection line corresponding to the first sub-pixel column of the same color sub-pixels in the nth row is charged with an additional detection voltage, such that the detected voltage on this detection line is the sum of the detection voltage and a coupling voltage. The detection line corresponding to the second sub-pixel column of the same color sub-pixels is not charged with the additional detection voltage, such that the detected voltage on this detection line is the coupling voltage. The detection voltage corresponding to the first sub-pixel column is obtained according to the voltage on the detection line corresponding to each of the same color sub-pixels. Similarly, in the blanking section of (2n)th display frame, the detection voltage corresponding to the second sub-pixel column may be obtained.