RGBW Display Gain Control for Chromatic Sharpness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
RGBW type display devices experience reduced sharpness of chromatic colors due to uneven luminance increase between chromatic and achromatic colors, as they apply the same pixel gain to all data, leading to chromatic colors appearing relatively darker.
Innovation Solution
A display device with an image processing unit that converts three-color input images into four-color data, applying different gains based on luminance and saturation values, and using block interpolation to adjust pixel weights and gains, thereby improving color contrast and sharpness by modifying gain values for chromatic and achromatic areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same pixel gain is applied to all pixels in RGBW type display device, then the calculation process is simple, but the sharpness of chromatic colors is reduced because luminance increase of chromatic color is more than luminance increase of achromatic color
Solution Approach 1:
The patent applies different pixel gains to different regions of the display based on local color characteristics. Specifically, it identifies chromatic color regions and achromatic color regions, and applies different gain values to each region to compensate for the uneven luminance increase. This local differentiation resolves the contradiction by maintaining calculation simplicity through automated region classification while achieving precise sharpness control for chromatic colors.
Solution Approach 2:
The patent dynamically changes the pixel gain parameter based on the color characteristics of different regions. By calculating saturation values and classifying regions as chromatic or achromatic, the system adjusts the gain parameter locally to optimize sharpness. This parameter adaptation allows the system to maintain simplicity in the overall process while achieving precise control over chromatic color sharpness through localized parameter modification.
2Manufacturing precision
If different pixel gains are applied to chromatic and achromatic areas, then the sharpness of chromatic colors is improved, but the device complexity increases due to additional gain calculation and region classification
Solution Approach 1:
The patent segments the display image into chromatic color regions and achromatic color regions based on saturation value calculations. This segmentation allows the system to apply different processing rules to different regions without requiring complex overall processing. The segmentation approach simplifies the complexity by creating clear, manageable regions that can be processed independently with appropriate gain values.
Solution Approach 2:
The system performs self-service by automatically classifying regions and determining appropriate gain values without requiring external intervention or complex manual configuration. The saturation calculation and region classification are performed autonomously by the image processing unit, which then applies the appropriate gains. This self-service mechanism reduces the perceived complexity by making the system self-regulating and adaptive.
3Manufacturing precision
If block gain calculation using position information is implemented, then the luminance of achromatic areas adjacent to chromatic areas is enhanced, but the processing time and computational load increase
Solution Approach 1:
The patent performs preliminary actions by pre-calculating saturation values and classifying regions before applying the final gain adjustment. The block gain calculation uses position information and scaled luminance values that are prepared in advance. This preliminary processing allows the system to efficiently determine which regions need enhanced luminance without adding significant processing time during the actual display update cycle.
Data Source
AI summary
Provided are a display device and an image processing method thereof. In an embodiment, the display device includes a display panel including a plurality of pixels formed of red, green, blue, and white sub pixels, and an image processing unit for converting a three-color input image supplied to the red, green, blue, and white sub pixels into four-color image data and outputting an output image by applying a final gain calculated using a frame gain, a pixel gain, and a block gain of the pixels. The display device also includes a timing controller for outputting the output image from the image processing unit to the display panel. The block gain may be calculated using scaled versions of luminance values determined by converting a luminance of the three-color input image and position information of the pixels.