PENTILE Display Data Compensation for Row Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
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
Implement a data compensator that adds extension bits to input image data for sub-pixels connected to data lines of different lengths, adjusting the data voltage to match the anode capacitance differences, thereby stabilizing luminance across even and odd-numbered pixel rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sub-pixels of different colors are connected to the same data line with different voltage levels supplied for each horizontal period, then the PENTILE™ pixel structure can be implemented, but peak current increases and power consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in a lookup table (LUT) during the programming phase. The compensation values for different anode capacitances are determined in advance and stored, so that during operation, the system only needs to retrieve the appropriate compensation value based on the pixel row identifier, rather than performing complex real-time calculations. This resolves the contradiction by enabling the PENTILE™ structure to function with minimal additional power consumption.
2Adaptability or versatility
If different voltage levels are supplied to data lines for sub-pixels of different colors, then the PENTILE™ pixel structure can be implemented, but peak current increases
Solution Approach 1:
The patent applies local quality by providing different compensation values to different pixel rows based on their specific anode capacitance characteristics. The data compensator identifies the pixel row and retrieves the corresponding compensation value from the lookup table, applying localized compensation rather than a uniform approach. This resolves the contradiction by maintaining the PENTILE™ structure while minimizing peak current through targeted, row-specific compensation.
3Adaptability or versatility
If data lines of different lengths are used to connect sub-pixels in even and odd pixel rows, then the PENTILE™ pixel structure can be implemented, but luminance uniformity deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the data voltage parameter based on the pixel row identifier. The data compensator changes the voltage level dynamically according to whether the pixel row has a longer or shorter anode, compensating for the capacitance difference. This resolves the contradiction by maintaining the PENTILE™ structure while achieving luminance uniformity through parameter adjustment.
4Illumination intensity
If compensation for anode capacitance differences is implemented, then luminance uniformity improves, but device complexity increases
Solution Approach 1:
The patent applies copying by using a lookup table that stores pre-calculated compensation values. Instead of implementing complex real-time calculation circuits, the system copies the appropriate compensation value from the LUT based on the pixel row identifier. This resolves the contradiction by achieving luminance uniformity through a simple table-lookup mechanism rather than complex computational hardware.
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.