OLED Pixel Data Correction for Luminance Uniformity
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Solution Overview
Problem
Existing OLED display panels face challenges in simultaneously correcting variations in light emitting elements and drive current, leading to luminance and color unevenness, which current technologies cannot address with high precision.
Innovation Solution
An image processing apparatus that stores and corrects pixel data based on operating currents of light emitting elements, generating correction information to optimize luminance and color correction, and includes a system to import operating currents synchronously with a pixel clock, eliminating the need for external circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing correction technologies (JP-T-2005-530203, JP-A-2007-65015) are used to correct luminance and color unevenness, then some correction is achieved, but high-precision simultaneous correction of light emitting element variations and drive current variations is not possible
Solution Approach 1:
The patent segments the correction process into two distinct correction values: first correction value for light emitting element variations and second correction value for drive current variations. This segmentation allows each type of variation to be corrected independently and simultaneously, achieving high-precision correction that existing technologies cannot provide.
Solution Approach 2:
The patent changes the correction parameters by introducing separate correction values for different sources of variation (light emitting elements and drive currents). By adjusting these distinct parameters independently, the system achieves simultaneous correction of multiple variation sources, resolving the limitation of existing technologies that use unified correction approaches.
2Illumination intensity
If OLED display panels use different organic materials for each color component to achieve high response speed and wide viewing angle, then image quality is improved, but luminance and color unevenness occur due to degradation differences, reducing product yield and increasing cost
Solution Approach 1:
The patent applies local quality correction by generating correction values tailored to specific pixels or regions of the display panel. Each pixel's correction values are determined based on its specific light emitting element characteristics and drive current conditions, allowing localized correction of luminance and color unevenness while maintaining the overall high image quality enabled by OLED technology.
3Manufacturing precision
If existing correction methods are applied to OLED display panels, then some luminance and color unevenness is reduced, but high-precision correction of both light emitting element variations and drive current variations cannot be achieved simultaneously
Solution Approach 1:
The patent merges two correction functions into a unified correction system that simultaneously applies both first correction values (for light emitting elements) and second correction values (for drive currents). This merging allows the system to achieve high-precision correction of multiple variation sources without requiring separate correction systems, thus managing device complexity while improving manufacturing precision.
Data Source
AI summary
An image processing apparatus which corrects pixel data corresponding to pixels configuring a display image of a display device having light emitting elements includes an information storage unit which, in units of one or a plurality of pixels of the display device, stores information corresponding to operating currents of light emitting elements included in the one or plurality of pixels, and a pixel data correction unit which corrects the pixel data based on the information corresponding to the operating currents stored in the information storage unit.