RGBW LCD White Brightness Control via Average Picture Level
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional RGBW liquid crystal display devices experience reduced light efficiency and cause user eye strain due to excessively high white brightness, especially when used as multi-function monitors, as they fail to effectively control image brightness according to the average picture level and chromatic color/achromatic color ratio.
Innovation Solution
An apparatus and method for driving a liquid crystal display device that includes a liquid crystal panel with 4-color sub-pixels, a data driver, a gate driver, and a data converter that detects the average picture level and chromatic/achromatic color ratio to generate a gain value, converting 3-color source data into 4-color data and controlling the display to adjust white brightness naturally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If RGBW type liquid crystal display device is used to improve light efficiency and white brightness, then light efficiency is improved, but white brightness becomes excessively high causing user eye strain
Solution Approach 1:
The patent applies dynamics by making the white brightness adjustable and adaptive. The system dynamically adjusts the white brightness level based on the average picture level (APL) of the displayed image, transitioning from a fixed high brightness state to a variable brightness state that adapts to different viewing conditions, thereby reducing eye strain while maintaining light efficiency
Solution Approach 2:
The patent changes the parameter of white brightness based on the average picture level (APL). By detecting the APL and adjusting the white brightness accordingly, the system optimizes the balance between light efficiency and user comfort, preventing excessive brightness that causes eye strain while maintaining the advantages of RGBW display
2Illumination intensity
If conventional RGBW liquid crystal display device displays high white brightness, then white brightness is high, but image brightness cannot be controlled according to average picture level
Solution Approach 1:
The patent implements feedback by detecting the average picture level (APL) of the displayed image and using this information to adjust the white brightness. This closed-loop control system continuously monitors the image characteristics and automatically adjusts brightness parameters, enabling precise control of image brightness according to APL while maintaining high white brightness when needed
Solution Approach 2:
The system performs preliminary detection of the average picture level (APL) before adjusting the white brightness. By analyzing the image characteristics in advance and pre-adjusting the brightness parameters accordingly, the system ensures optimal display performance is achieved automatically without requiring manual intervention or post-adjustment
Data Source
AI summary
An apparatus for driving a liquid crystal display, which is capable of controlling image brightness according to an Average Picture Level (APL) in a red-green-blue-white (RGBW) type display, and a driving method using the same is disclosed. The apparatus for driving a liquid crystal display device includes: a liquid crystal panel including 4-color sub-pixels; a data driver for providing video data signals to each sub-pixel; a gate driver for providing a scan pulse to each sub-pixel A data converter determines an Average Picture Level (APL) of 3-color source data, and generates a gain value corresponding to the average picture level. The 3-color source data is converted into 4-color data using the generated gain value; and a timing controller for communicates the 4-color data received through the data converter to the data driver.