OLED Luminance Correction via Segmented Gain and Common Curve
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Solution Overview
Problem
Conventional organic EL displays face challenges in reducing manufacturing costs and complexity due to the need for extensive data processing and memory capacity to correct uneven luminance across pixels, especially as panel size and number of input tones increase, leading to increased time and cost in initial measurements and correction processes.
Innovation Solution
The display device employs a data voltage application type pixel circuit with a first memory for storing luminance gains specific to each pixel and a second memory for storing a representative conversion curve common to all pixels, allowing for simplified measurement and correction processes by converting video signals into luminance signals and then into voltage signals using the common conversion curve, reducing the need for extensive data storage and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods use extensive data processing and large memory capacity to correct uneven luminance across pixels, then luminance uniformity is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent segments the correction data into two parts: a common conversion curve shared by all pixels and individual luminance gain values for each pixel. This segmentation reduces the overall data storage requirement while maintaining correction effectiveness, directly addressing the contradiction between luminance uniformity and device complexity
Solution Approach 2:
The patent changes the parameter representation from storing complete conversion curves for each pixel to storing only luminance gain values alongside a common conversion curve. This parameter change significantly reduces memory capacity requirements while preserving the ability to correct luminance non-uniformity across the display panel
2Adaptability or versatility
If the panel size or number of input tones increases, then display quality is improved, but the time and cost for initial measurement and correction processes increase significantly
Solution Approach 1:
The patent uses a common conversion curve that is copied and applied to all pixels in the display panel, rather than performing separate measurements for each pixel. This copying approach allows the measurement process to be performed once for the entire panel, making the system scalable to larger panels without proportionally increasing measurement time and cost
Solution Approach 2:
The common conversion curve serves as a universal function for all pixels regardless of panel size or number of input tones. This universal approach enables the correction system to handle different panel configurations without requiring additional measurement procedures, thereby maintaining measurement efficiency as the display scales
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the amount of data required for each pixel, lowers manufacturing costs, and simplifies the correction process, achieving uniform display across the screen without the need for large memory capacity or complex data processing.
Implementation Method 1
Image display devices in which organic EL elements (also known as organic light emitting diodes, or OLEDs) are used
Data Source
AI summary
A display device corrects uneven luminance due to uneven element characteristics by simple measurement and correction with a low cost. The display device includes pixels that each include a light emitter and a driver. Data lines supply a voltage signal to the driver of each pixel. A data line driver supplies the voltage signal to each data line. A first memory stores, for each pixel, a luminance gain for adjusting a luminance corresponding to a video signal to a standard luminance. A second memory stores conversion curve information representing a representative conversion curve common to the pixels. A corrector converts, for each pixel, the luminance into a corresponding standard luminance value based on a corresponding luminance gain stored in the first memory, while a converter converts, for each pixel, the corresponding standard luminance into a corresponding voltage signal based on the conversion information stored in the second memory.