Display Device Horizontal Crosstalk Compensation via Gamma Voltage Adjustment
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Solution Overview
Problem
Display devices, such as OLEDs, experience horizontal crosstalk due to variations in data voltages across pixels in the same row, leading to luminance distortions, where low luminance data results in increased gate load and decreased scan time, and high luminance data results in decreased gate load, causing undesired luminance levels.
Innovation Solution
A display device with a gray group data generator, horizontal crosstalk determiner, and compensator that adjusts gamma reference voltages based on comparisons between current and adjacent row gray group data to compensate for horizontal crosstalk, ensuring accurate luminance levels by generating data voltages corresponding to the adjusted gamma reference voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low luminance data is provided to pixels in the same row, then gate load increases and scan on time decreases, but luminance distortion occurs due to insufficient data voltage storage
Solution Approach 1:
The patent applies local quality by determining horizontal crosstalk occurrence specifically for each row based on pixel data differences, and selectively adjusting gamma reference voltages only for rows where crosstalk is detected. This allows the system to maintain fast scanning for most rows while providing targeted luminance compensation only where needed, resolving the contradiction between scan speed and luminance accuracy.
Solution Approach 2:
The patent changes the parameter of gamma reference voltages dynamically based on detected horizontal crosstalk conditions. By adjusting gamma reference voltages according to the specific row's pixel data characteristics, the system compensates for luminance distortion without compromising the overall scan on time, thus resolving the contradiction between productivity and manufacturing precision.
2Productivity
If high luminance data is provided to pixels in the same row, then gate load decreases and scan on time increases, but luminance distortion occurs due to excessive data voltage storage
Solution Approach 1:
The system determines horizontal crosstalk occurrence for each row based on pixel data differences and selectively applies gamma reference voltage adjustments only to rows where crosstalk is detected. This localized approach maintains fast scanning for rows without crosstalk issues while providing targeted luminance compensation where needed.
Solution Approach 2:
The patent dynamically adjusts gamma reference voltages based on the detected horizontal crosstalk conditions in each row. By modifying this parameter selectively, the system compensates for luminance distortion caused by excessive gate load without compromising the overall scan on time performance.
3Manufacturing precision
If gamma reference voltages are adjusted to compensate for horizontal crosstalk, then luminance accuracy improves, but device complexity increases
Solution Approach 1:
The patent calculates gray group data representing reference gray group distribution before the actual display operation. This preliminary calculation allows the system to determine horizontal crosstalk conditions and prepare appropriate gamma reference voltage adjustments in advance, simplifying the overall compensation mechanism by performing analysis beforehand rather than during the display process.
Solution Approach 2:
The patent uses gray group data that copies and summarizes the distribution characteristics of pixel data into a simplified representation. This copying approach reduces the complexity of processing individual pixel values while maintaining the essential information needed for crosstalk detection and gamma voltage adjustment, thus improving luminance accuracy without proportionally increasing device complexity.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a gray group data generator configured to receive current line data for pixels in a current row, and to generate current row gray group data based on the current line data, a horizontal crosstalk determiner configured to determine whether horizontal crosstalk occurs in the current row, a horizontal crosstalk compensator configured to compare the current row gray group data with adjacent row gray group data when the horizontal crosstalk is determined to occur in the current row, and to selectively adjust a plurality of gamma reference voltages according to a result of the comparison between the current row gray group data and the adjacent row gray group data, and a data driver configured to generate and provide data voltages corresponding to the current line data based on the selectively adjusted plurality of gamma reference voltages.