Display Pixel Luminance Compensation via Stack Count Adjustment
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Solution Overview
Problem
Current display devices face challenges in maintaining consistent luminance across pixels due to variations in the number of effective light sources, leading to potential display quality deterioration and reduced pixel lifespan.
Innovation Solution
A display device and method that include a compensator to adjust data voltages based on stack number information, which indicates the number of effective light sources for each pixel, allowing for compensation of grayscale values to maintain consistent luminance and reduce stress on pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of stacks (light emitting elements) in pixels is increased to improve luminance, then the luminance output is improved, but the manufacturing precision and consistency across pixels deteriorate due to variations in effective light source count
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the driving current based on the detected number of effective stacks in each pixel. The compensator modifies the driving parameters (current magnitude) according to the actual effective light source count, thereby compensating for manufacturing variations and achieving consistent luminance output across pixels with different stack configurations
Solution Approach 2:
The patent implements feedback by detecting the number of effective stacks in each pixel and using this information to adjust the driving current. The system continuously monitors the actual effective light source count and feeds this information back to the compensator, which then adjusts the driving parameters to maintain uniform luminance despite variations in stack effectiveness
2Illumination intensity
If the number of stacks is increased to improve luminance, then the luminance output is improved, but the lifespan of pixels deteriorates due to increased stress on light emitting elements
Solution Approach 1:
The patent applies dynamics by making the driving current adaptive rather than fixed. The system dynamically adjusts the driving current magnitude based on the actual number of effective stacks detected in each pixel. This dynamic adjustment allows the system to optimize luminance output while simultaneously reducing stress on light emitting elements by avoiding excessive current application, thereby extending pixel lifespan
3Device complexity
If uniform driving voltage is applied to all pixels, then the device complexity is reduced, but the display quality deteriorates due to luminance variations from different effective stack counts
Solution Approach 1:
The patent applies local quality by implementing pixel-specific driving current adjustment based on individual pixel characteristics. Instead of applying a uniform driving voltage to all pixels, the system detects the number of effective stacks in each pixel and applies locally optimized driving parameters. This localized approach ensures that each pixel receives the appropriate current magnitude to achieve uniform luminance output across the display
Data Source
AI summary
A display device includes: a display unit including pixels, wherein each of the pixels includes stacks connected in series and each of the stacks includes a light emitting element; a storage to store pieces of stack number information, wherein each of the pieces of the stack number information indicates the number of stacks constituting an effective light source from among the stacks for each of the pixels; a compensator to generate compensated data by compensating image data based on the pieces of the stack number information; and a data driver to generate data voltages based on the compensated data and to provide the data voltages to the display unit. The pixels are to emit light with luminances corresponding to the data voltages.