RGBW Display Luminance Control for Pure Color Blocks
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Solution Overview
Problem
Display apparatuses with a pentile RGBW structure face reduced luminance for pure color images due to the white subpixel being turned off, leading to lower luminance levels and increased power consumption.
Innovation Solution
A method to control the luminance of a light source by generating red, green, and blue data, applying color weights to determine pixel luminance, and adjusting the light source based on local information of pure color blocks, such as presence, location, and size, to improve display quality and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the white subpixel is turned off for pure color images in a pentile RGBW structure, then color saturation is improved, but luminance level decreases
Solution Approach 1:
The patent implements dynamic control of the backlight luminance based on the detection of pure color blocks in the displayed image. When pure color blocks are detected (areas where only RGB subpixels are active and white subpixels are off), the system automatically increases the backlight luminance to compensate for the reduced brightness in those regions, thereby maintaining both color saturation and acceptable luminance levels
Solution Approach 2:
The system changes the backlight luminance parameter dynamically based on image content analysis. By detecting the presence, location, and size of pure color blocks, the system adjusts the backlight luminance parameter to maintain overall display quality while preserving the color saturation benefits of turning off white subpixels in pure color regions
2Manufacturing precision
If the white subpixel is turned off for pure color images, then color purity is enhanced, but power consumption increases
Solution Approach 1:
The system applies partial compensation by increasing backlight luminance only in regions containing pure color blocks, rather than uniformly increasing luminance across the entire display. This targeted approach maintains color purity in pure color regions while minimizing the additional power consumption that would result from global luminance increase
Solution Approach 2:
The backlight luminance parameter is dynamically adjusted based on the detected pure color block characteristics (presence, location, size). The system optimizes the balance between color purity and power consumption by applying luminance compensation only where and when pure color blocks are present, rather than maintaining high luminance universally
3Illumination intensity
If the backlight luminance is uniformly increased to compensate for pure color blocks, then viewing quality is improved, but power consumption increases
Solution Approach 1:
The display screen is segmented into different regions based on the detection of pure color blocks. The system identifies specific areas (pure color blocks) where luminance compensation is needed and applies luminance adjustment only to those segmented regions, rather than uniformly increasing luminance across the entire display, thereby reducing overall power consumption
Solution Approach 2:
The system applies different luminance compensation strategies to different regions of the display. Pure color block regions receive increased luminance compensation to maintain viewing quality, while other regions maintain normal luminance levels, optimizing the balance between viewing quality and power consumption through localized quality adjustment
Data Source
AI summary
A method of controlling a luminance of a light source is presented. The method entails generating red, green, blue and white data using red, green and blue data, applying a color weight according to contribution to luminance by each of the red, green, blue and white data to generate pixel luminance data, setting a luminance level of the light source based on the pixel luminance data, determining local information on a pure color block in a frame image by using the pixel luminance data, and adjusting the luminance level of the light source based on the local information on the pure color block. A display device that utilizes such method is also presented.