RGBW LCD Data Conversion Using Uniform Gain Control
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Solution Overview
Problem
RGBW type LCD devices face challenges in maintaining color realization ratio and light efficiency due to varying brightness amplification factors for 3-color image signals, leading to differences in perceived images compared to RGB type displays, and require complex operation circuits for converting 3-color to 4-color image signals.
Innovation Solution
An apparatus and method for driving an LCD device that includes a liquid crystal panel with 4-color sub-pixels, a data driver, a gate driver, and a data conversion part that generates a gain value by analyzing 3-color source data to convert it into 4-color data, simplifying the operation and ensuring synchronized application of 4-color data with scan pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a 3-color image signal is converted into a 4-color image signal using gain curves with varying brightness amplification factors, then the color area is extended and brightness is increased, but the perceived image becomes different from the original RGB display and the operation circuit becomes complex
Solution Approach 1:
The patent applies parameter changes by using a single uniform gain value for all color channels (R, G, B, W) instead of different gain curves for each channel. The gain value is dynamically adjusted based on the luminance of the input image, allowing brightness enhancement while maintaining color consistency and simplifying the operation circuit to only require single-channel gain control.
Solution Approach 2:
The patent uses a universal gain application approach where a single gain value controls the brightness amplification of all four color channels (R, G, B, W) simultaneously. This multi-functional approach replaces the need for separate gain curves for each channel, simplifying the operation circuit while achieving uniform brightness enhancement across the entire image.
2Adaptability or versatility
If a 3-color image signal is converted into a 4-color image signal using gain curves, then the color area is extended, but the perceived image becomes different from the original RGB display
Solution Approach 1:
The patent maintains image consistency by applying the same gain value to all color channels, ensuring that the relative luminance relationships between different colors are preserved. This uniform parameter application prevents color distortion while still extending the color area through the addition of the white sub-pixel, achieving both adaptability and manufacturing precision.
Solution Approach 2:
The patent applies homogeneity by using a uniform gain value across all color channels (R, G, B, W) rather than different gain curves for each channel. This homogeneous treatment ensures that the perceived image remains consistent with the original RGB display while still benefiting from the extended color area provided by the white sub-pixel.
3Ease of manufacture
If color filters are arranged in each sub-pixel of red, green, and blue, then color display is achieved, but light efficiency is significantly reduced
Solution Approach 1:
The patent applies segmentation by dividing the pixel structure into multiple sub-pixels (R, G, B, W) with different functions. The white sub-pixel is specifically designed without a color filter to maximize light transmission and efficiency, while the R, G, B sub-pixels maintain color display functionality. This segmented approach allows the display to achieve both color capability and high light efficiency by letting the white sub-pixel contribute to overall brightness without the light loss associated with color filters.
Data Source
AI summary
An apparatus for driving a liquid crystal display (LCD) device includes a liquid crystal panel including 4-color sub-pixels, a data driver to provide video data signals to each sub-pixel, a gate driver to provide a scan pulse to each sub-pixel, a data conversion part to generate a gain value by analyzing a ratio of an achromatic color signal to a chromatic color signal of 3-color source data inputted from an external source and convert the 3-color source data into 4-color data using the generated gain value, and a timing controller to provide the 4-color data received from the data conversion part to the data driver and control the gate driver and the data driver.