Four-Color Display Text Readability via Local Sub-Pixel Driving
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Solution Overview
Problem
Four-color display devices face reduced readability when implementing ClearType technology, as it is based on a three-color display system, leading to deteriorated display quality.
Innovation Solution
A display device with an image processor that detects text and performs image processing to drive specific sub-pixels in a light-emitting state, adjusting luminance and grayscale values to enhance readability, including converting image signals to appropriate formats for red, white, blue, and green sub-pixels, and relocating data to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ClearType technology is applied in a four-color display device, then text readability is improved, but display quality deteriorates
Solution Approach 1:
The patent applies different processing strategies to different regions of text. The image processor identifies left edges, right edges, and central parts of text, and applies specific sub-pixel driving patterns to each region. For left edges, white/blue/green sub-pixels are driven; for right edges, red/white/blue sub-pixels are driven; and for central parts, appropriate sub-pixels are driven based on the original ClearType pattern. This localized processing maintains readability improvement while preserving overall display quality.
Solution Approach 2:
The patent changes the parameters of image signal processing by converting RGB grayscale data to YCbCr color space, then adjusting luminance and chrominance components differently for edge and central regions. The image processor modifies the driving signals for different sub-pixel types (red, green, blue, white) based on their specific positions and functions in text rendering, thereby achieving both improved readability and maintained display quality through parameter optimization.
2Measurement precision
If ClearType is realized in a four-color display device, then text rendering is enhanced, but color accuracy is reduced
Solution Approach 1:
The patent applies different color processing to different text regions. For left edges, the image processor drives white, blue, and green sub-pixels with specific grayscale values; for right edges, it drives red, white, and blue sub-pixels; and for central parts, it drives appropriate sub-pixels based on the original ClearType pattern. This localized color management ensures both enhanced text rendering and maintained color accuracy by optimizing sub-pixel driving patterns for each region's specific requirements.
Solution Approach 2:
The patent transforms the image signal from RGB color space to YCbCr color space, allowing independent adjustment of luminance (Y) and chrominance (Cb, Cr) components. The image processor then adjusts these parameters differently for edge and central regions, converting back to RGBW grayscale data with optimized values for each sub-pixel type. This parameter transformation and optimization maintains color accuracy while enhancing text rendering through region-specific signal processing.
Data Source
AI summary
A display device is proposed. The display device includes unit pixels in which red, white, blue, and green sub-pixels are sequentially arranged, and includes an image processor configured to detect text from an image signal input from outside, perform image processing on the text, and output the text, wherein in the unit pixels respectively corresponding to both edges of the text, the image processor may perform image processing so that predetermined sub-pixels adjacent to a central part of the text are driven in a light-emitting state.