Shared Data-Line Voltage Compensation in Pentile Displays
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Solution Overview
Problem
Display devices with PENTILE™ pixel structures experience increased power consumption and non-uniform luminance due to differences in voltage levels supplied to data lines connected to sub-pixels emitting different colors, leading to peak current fluctuations.
Innovation Solution
A data compensator adds extension bits to input image data for sub-pixels with different anode lengths, adjusting data voltage levels to equalize luminance between odd and even-numbered pixel rows by compensating for current deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sub-pixels for emitting different colors are connected to the same data line, then device complexity is reduced, but luminance uniformity deteriorates due to different anode lengths requiring different voltage levels
Solution Approach 1:
The patent applies local quality by providing different voltage levels to different regions (odd-numbered and even-numbered pixel rows) connected to the same data line. Specifically, it supplies a first voltage level to odd-numbered pixel rows and a second voltage level to even-numbered pixel rows, allowing each region to receive appropriate voltage compensation based on its specific anode length characteristics, thereby achieving luminance uniformity while maintaining the simplified shared data line structure
Solution Approach 2:
The patent changes the voltage level parameter to compensate for luminance differences. By adjusting the voltage level supplied to data lines based on the pixel row type (odd or even), the system compensates for the luminance variations caused by different anode lengths, enabling uniform display quality without requiring separate data lines for each pixel row
2Illumination intensity
If voltage levels are changed frequently to compensate for anode length differences, then luminance uniformity improves, but power consumption increases due to peak current fluctuations
Solution Approach 1:
The patent applies preliminary action by pre-establishing different voltage levels for odd-numbered and even-numbered pixel rows before actual display operation. The system configures the data driver to supply appropriate voltage levels to different pixel rows in advance, avoiding frequent voltage transitions during operation and thereby reducing peak current fluctuations and power consumption while maintaining luminance uniformity
Data Source
AI summary
A display device includes a data compensator to generate output image data by adding an extension bit to input image data received from an external processor, a data driver to supply a data voltage corresponding to the output image data to each of data lines, and a pixel unit including a plurality of sub-pixels. A first data line for providing a first color data signal is connected to a first sub-pixel disposed in an odd-numbered pixel row through a first anode, and is connected to a second sub-pixel disposed in an even-numbered pixel row through a second anode having a different size than the first anode, and the data compensator is configured to add a first extension bit to the input image data corresponding to the first sub-pixel and add a second extension bit to the input image data corresponding to the second sub-pixel.