4-Color Data Conversion for Display Sharpness Control
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Solution Overview
Problem
Existing display apparatuses that enhance sharpness by converting 3-color input data into 4-color data often suffer from excessive sharpness enhancement, leading to picture quality deterioration, such as ringing artifacts, and require unnecessary conversion steps between luminance and RGB components.
Innovation Solution
An apparatus that generates 4-color data for each unit pixel with red, green, blue, and white sub-pixels, using a sharpness enhancer to correct white data based on luminance variations of adjacent pixels, and calculates a sharpness gain value to adjust edge correction, thereby enhancing sharpness without deteriorating picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sharpness enhancement is applied by correcting luminance components of edge portions, then sharpness is improved, but picture quality deteriorates due to excessive sharpness enhancement and ringing artifacts
Solution Approach 1:
The patent applies different processing to different regions: only edge portions are subjected to sharpness enhancement by correcting luminance components, while non-edge regions remain unchanged. This localized approach prevents excessive sharpness enhancement in areas where it is not needed, thereby avoiding ringing artifacts and picture quality deterioration.
Solution Approach 2:
The patent performs partial action by selectively enhancing only the edge portions of the image rather than applying sharpness enhancement to the entire image. By using edge detection to identify boundary regions and applying correction only to those specific areas, the patent achieves sharpness improvement without the excessive action that would cause harmful artifacts.
2Measurement precision
If RGB 3-color data is converted to luminance components and re-converted back to RGB data, then sharpness enhancement can be applied, but device complexity increases due to unnecessary conversion steps
Solution Approach 1:
The patent extracts only the necessary component for sharpness enhancement - the luminance information at edge portions - from the RGB data. Instead of converting the entire RGB data to luminance and back, it extracts edge information directly from the RGB components and applies enhancement only where needed, eliminating unnecessary conversion steps and reducing device complexity.
Solution Approach 2:
The patent performs preliminary edge detection on the RGB data to identify edge portions before applying sharpness enhancement. This preliminary action allows the system to prepare a mask or selection map that guides subsequent enhancement operations, avoiding the need for complete RGB-to-luminance conversion and enabling direct processing of only the relevant edge regions.
Data Source
AI summary
Disclosed is an apparatus for converting data capable of enhancing sharpness without deterioration of picture quality, and a display apparatus using the same, wherein the apparatus for converting data is provided in the display apparatus with a plurality of unit pixels, each unit pixel with red, green, blue and white sub-pixels, and the apparatus for converting data includes a 4-color data generator for generating 4-color data of red, green, blue and white colors for each unit pixel based on 3-color input data of red, green and blue colors of an input image; and a sharpness enhancer for enhancing sharpness of the input image by correcting white sub-pixel data of the unit pixel corresponding to an edge portion of the input image by a luminance variation of adjacent unit pixels based on white sub-pixel data for each unit pixel.