Display Panel On-Pixel Rate Compensation for Luminance Distortion
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Solution Overview
Problem
In display devices, the non-ideal power supply causes variations in current supplied to pixels, leading to changes in pixel luminance and distorted color coordinates, especially when displaying bright images, due to increased load on the power supply.
Innovation Solution
A data signal processing device calculates an on-pixel rate (OPR) based on image data signals and positional weight values, which are determined by the locations of pixels and voltage drops, to compensate for luminance distortions caused by frame luminance loads. This involves a load calculator, a compensation processor, and gamma signal processing to adjust gamma signals using compensation factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power supply is used to drive pixels in a display device, then the display device can function, but the current supplied to each pixel changes as the total driving current changes, causing luminance distortion and color coordinate distortion
Solution Approach 1:
The system performs preliminary calculation of the on-pixel rate (OPR) based on image data signals and positional weight values before actual display occurs. This pre-calculated OPR is then used to generate compensation factors that adjust gamma signals in advance, preventing luminance distortion before it happens rather than correcting it after occurrence.
Solution Approach 2:
The system incorporates feedback mechanisms by measuring actual voltage drops at pixel locations and using this information to adjust the positional weight values. The measured voltage drops are fed back into the OPR calculation, allowing the system to dynamically compensate for power supply variations and maintain consistent luminance across different display conditions.
2Illumination intensity
If the display device displays bright images, then the luminance increases, but the load on the power supply increases causing current variations and luminance distortion
Solution Approach 1:
The system changes the parameter of gamma signal values by introducing compensation factors derived from the on-pixel rate. When bright images are displayed and power supply load increases, the compensation factors adjust the gamma signals to offset the expected luminance drop, maintaining stable perceived luminance despite changing electrical conditions.
3Manufacturing precision
If positional weight values are determined based on voltage drop, then luminance distortion is compensated, but the system complexity increases due to measurement and interpolation requirements
Solution Approach 1:
The system creates a simplified model of the power supply network by using positional weight values that represent voltage drop characteristics. Instead of directly measuring and compensating for each pixel's actual voltage drop in real-time, the system uses pre-determined positional weight values that copy the essential voltage drop patterns, reducing measurement and computational complexity while maintaining compensation effectiveness.
Data Source
AI summary
A data signal processing device includes a load calculator and a compensation processor. The load calculator calculates an on-pixel rate (OPR) based on image data signals and positional weight values. The positional weight values are determined based on locations of pixels in a display panel. The OPR is proportional to a frame luminance load, which corresponds to a sum of driving currents for the pixels to emit light in each of a plurality of frames. The compensation processor compensates distorted luminance caused by the frame luminance load based on the OPR.