RGBW LCD Data Conversion for Brightness and Color Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
RGBW type liquid crystal display devices face limitations in displaying original images without color difference due to the influence of the white sub-pixel on adjacent red, green, and blue sub-pixels, and struggle to balance brightness and color accuracy.
Innovation Solution
A liquid crystal display device with a mode selector that allows switching between RGB and RGBW modes, incorporating a data converting part that performs color correction and gamma conversion to convert RGB input data into RGBW data in RGBW mode, and outputs RGB input data with a W sub-pixel off signal in RGB mode to maintain color accuracy and enhance brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If RGBW data conversion is performed to increase brightness, then the brightness of displayed images increases, but color difference appears due to the influence of the white sub-pixel on adjacent color sub-pixels
Solution Approach 1:
The patent applies dynamics by making the data conversion process adaptive rather than static. The conversion method dynamically adjusts the contribution of the white sub-pixel based on the luminance characteristics of the displayed image. When the image requires high brightness, the white sub-pixel is utilized more; when color accuracy is paramount, the conversion algorithm reduces white sub-pixel dependency, thus resolving the contradiction between brightness and color accuracy
Solution Approach 2:
The patent changes the conversion parameters based on image characteristics. By analyzing the luminance values and color composition of the input image, the conversion algorithm adjusts the weighting factors and conversion coefficients dynamically. This parameter adjustment allows the system to optimize between brightness enhancement and color fidelity depending on the specific display requirements
2Illumination intensity
If the white sub-pixel is used to display white images without additional color filters, then brightness increases, but the white sub-pixel influences adjacent red, green and blue sub-pixels causing color difference
Solution Approach 1:
The patent introduces an intermediary data conversion process that mediates between the white sub-pixel output and the adjacent color sub-pixels. The conversion algorithm acts as a buffer, calculating appropriate drive signals for each sub-pixel type based on the desired output color and the known optical crosstalk characteristics. This intermediary processing prevents the white sub-pixel from directly causing color interference while maintaining its brightness benefit
Solution Approach 2:
The patent applies preliminary anti-action by pre-compensating for the color interference that the white sub-pixel would cause. The conversion algorithm calculates and applies counteracting signals to the adjacent color sub-pixels before the actual display occurs. This preemptive measure neutralizes the harmful optical crosstalk effect, allowing the white sub-pixel to operate at full brightness without degrading color accuracy
Data Source
AI summary
A liquid crystal display device includes: a liquid crystal panel including a pixel having red, green, blue and white sub-pixels; a mode selector selecting one from an RGB mode and an RGBW mode as a driving mode; an RGBW mode signal generating part performing a color correction on RGB input data corresponding to the pixel and converting the RGB input data into RGBW data in the RGBW mode; and an output controlling part outputting RGBW output data by performing a gamma conversion on the RGBW data in the RGBW mode and outputting the RGB input data and a W data for turning off the W sub-pixel as the RGBW output data in the RGB mode.