OLED Luminance Controller for Power and Clarity
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Solution Overview
Problem
Conventional OLED display devices increase power consumption and degrade image clarity and readability by uniformly enhancing luminance across the entire display area, leading to inefficient power use and reduced lifespan of OLED elements.
Innovation Solution
A luminance controller that calculates minimum and maximum gray level values from primary RGB data, determines compensation and gain values, and applies these to generate secondary RGB data, focusing on improving achromatic color luminance while restricting luminance increase in dark areas to enhance image clarity and sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If luminance of the entire display area is improved uniformly, then luminance efficiency is improved, but power consumption increases and image clarity degrades
Solution Approach 1:
The patent applies different luminance enhancement strategies to different regions of the display based on local image characteristics. Achromatic regions (grayscale areas) receive targeted luminance improvement through gamma correction and lookup tables, while chromatic regions maintain their original luminance properties. This localized approach improves overall luminance efficiency without uniformly increasing power consumption across the entire display area.
Solution Approach 2:
The display image is segmented into achromatic and chromatic regions through color space conversion and analysis. By separating these regions and applying different processing techniques to each, the system can improve luminance where needed (achromatic areas) while avoiding unnecessary power consumption in chromatic areas, thus resolving the contradiction between luminance improvement and power consumption.
2Illumination intensity
If luminance of the entire display area is improved uniformly, then luminance efficiency is improved, but clarity and readability of dark images degrade
Solution Approach 1:
The patent applies luminance enhancement selectively to achromatic regions while preserving the luminance characteristics of chromatic regions. This localized enhancement maintains the contrast and detail in dark images by avoiding uniform brightness increases that would wash out image details, thereby improving clarity while still achieving luminance improvement in appropriate areas.
Solution Approach 2:
Instead of uniformly increasing luminance across the entire display, the patent inverts the approach by selectively enhancing only achromatic regions and leaving chromatic regions unchanged. This inverted strategy prevents the degradation of image clarity that would result from uniform enhancement, as chromatic regions maintain their original contrast and detail properties.
3Illumination intensity
If luminance of the entire display area is improved uniformly, then luminance efficiency is improved, but lifespan of OLED elements is reduced
Solution Approach 1:
The patent implements luminance enhancement only in achromatic regions where it is most beneficial, rather than uniformly across the entire display area. This localized approach reduces the total power consumption and cumulative stress on OLED elements, thereby extending their operational lifespan while still achieving the desired luminance improvement in critical grayscale display areas.
Solution Approach 2:
The patent applies luminance enhancement partially - only to achromatic regions and not to chromatic regions - rather than excessively enhancing the entire display area. This partial action achieves sufficient luminance improvement for grayscale content while avoiding the excessive power consumption and element stress that would result from full-area enhancement, thus preserving OLED element lifespan.
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
Reduces power consumption and improves image clarity and readability by selectively enhancing luminance, particularly at edges and achromatic areas, thereby extending the lifespan of OLED elements and maintaining high luminance efficiency.
Implementation Method 1
An OLED display device is a self-emissive device in which light is emitted from an organic emission layer by recombination of electrons and holes
Data Source
AI summary
A luminance controller of an OLED device and the OLED device including the luminance controller include a peaking processor for calculating a minimum gray level value by filtering low gray level data from primary RGB data and determining a compensation gain value corresponding to the minimum gray level value; a boosting processor for calculating a maximum gray level value by filtering high gray level data from the primary RGB data, calculating a gain value corresponding to the maximum gray level value, and calculating a coloring ratio coefficient using the minimum gray level value and the maximum gray level value; and a secondary RGB generator for generating secondary RGB data by applying the compensation gain value, the coloring ratio coefficient, and the gain value to the primary RGB data.