Display Driver Selective Sensing for Luminance Uniformity
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Solution Overview
Problem
Display devices face issues with luminance deviations due to variations in electrical characteristics of driving transistors, causing image quality deterioration and visually recognizable lines during sensing operations, especially in low brightness images.
Innovation Solution
The display device selectively performs sensing operations based on grayscale values of input image data, adjusting a reference grayscale value to prevent visually recognizable lines by comparing ratios of grayscale values and applying a scale factor or temperature adjustments to the reference value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sensing operation is performed to compensate for electrical characteristic variations of driving transistors, then manufacturing precision of pixel luminance is improved, but horizontal lines become visually recognizable on the display panel, worsening display quality
Solution Approach 1:
The patent changes the grayscale parameter of the sensing operation by applying a scale factor to the input image data before sensing. This parameter transformation ensures that the sensed grayscale values, after compensation, map to appropriate display grayscale values, preventing visual artifacts while maintaining luminance uniformity across pixels
Solution Approach 2:
The patent introduces an intermediate processing step where the input image data is scaled by a scale factor before the sensing operation. This intermediary transformation acts as a mediator between the raw input data and the sensing process, ensuring that the sensing operation operates on transformed data that, when compensated and displayed, does not produce visible horizontal lines
2Measurement precision
If a sensing operation is performed on low brightness images, then electrical characteristics are measured, but horizontal lines are more prominently recognized, worsening user experience
Solution Approach 1:
The patent applies a scale factor transformation to the image data before sensing, which effectively changes the parameter range being sensed. This parameter change ensures that even in low brightness regions, the sensed values after compensation map to appropriate display ranges, preventing prominent visual artifacts while maintaining measurement capability
3Reliability
If sensing operation is continuously performed, then pixel electrical characteristics are compensated, but display quality deteriorates due to visible sensing lines, worsening ease of operation
Solution Approach 1:
The patent continuously performs sensing operations while applying a scale factor transformation to the input data. This parameter change approach allows continuous compensation to maintain image quality consistency while the transformation ensures that the compensated values do not produce visible sensing lines, thereby maintaining user experience quality
Data Source
AI summary
A display device includes a display panel including pixels, and a driver to drive the display panel based on input image data. The driver performs a sensing operation for the pixels, to selectively perform the sensing operation by comparing grayscale values of the input image data and a reference grayscale value, to selectively perform a luminance control operation for controlling luminance of the display panel in response to a luminance control signal, and to adjust the reference grayscale value when the luminance control operation is performed.