Backlight Luminance Control Using Pre-stored Pattern Data
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Solution Overview
Problem
Existing display devices with liquid crystal panels require complex processing systems and high manufacturing costs due to the need for dedicated algorithms and ICs for local dimming control to detect peak luminance values in each display area, increasing system complexity and cost.
Innovation Solution
A display device with a storage unit that associates luminance information with image patterns and light sources, allowing for luminance control of each light source based on pre-stored data, eliminating the need for real-time peak luminance detection and dedicated ICs for local dimming control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If local dimming control is implemented to secure dynamic range, then image display quality is improved, but device complexity and manufacturing cost increase due to dedicated algorithms and ICs
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing luminance information for multiple image patterns in advance. Instead of performing real-time peak luminance detection and processing during operation, the system stores the results of luminance calculations for various predefined image patterns. When an image is displayed, the system simply retrieves the corresponding pre-stored luminance information and applies it to control the backlight units, thereby maintaining high image quality while eliminating the need for complex real-time processing algorithms and dedicated ICs.
2Measurement precision
If real-time peak luminance detection is performed for each display area, then local dimming control accuracy is improved, but processing time and computational load increase
Solution Approach 1:
The patent eliminates real-time processing by performing luminance detection and calculation in advance for multiple image patterns. The peak luminance values and corresponding backlight control data are computed beforehand and stored in memory. During actual operation, the system only needs to retrieve the pre-computed data based on the current image pattern being displayed, reducing processing time from real-time calculation to simple data lookup and application.
3Measurement precision
If dedicated ICs for local dimming control are provided, then control precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent makes the general control IC perform multiple functions: it handles both the storage of luminance information and the control of backlight units based on that information. By integrating these functions into a standard control IC rather than requiring dedicated specialized ICs, the system achieves the same control precision while reducing manufacturing costs and simplifying the overall device architecture.
Solution Approach 2:
The patent uses pre-stored luminance information data as a substitute for real-time computational processes. Instead of using expensive dedicated hardware to perform complex calculations, the system copies and applies pre-computed luminance data that corresponds to different image patterns, achieving accurate luminance control through data retrieval rather than computational hardware.
Data Source
AI summary
Provided is a display device with which a suitable image can be displayed with a simple device configuration. The display device has: a display panel which displays an image on the basis of a plurality of image patterns; a plurality of light sources which illuminate, from the back surface, respective regions of the display panel that has been divided into a plurality of regions; a storage unit which stores luminance information in which the respective image patterns and the luminance of the respective light sources in the image pattern are associated with each other; and a luminance control unit which controls the luminance of each of the light sources on the basis of the luminance information. The luminance control unit gradually changes the luminance of the light sources from the luminance of the light source before a change to the luminance of the light source after the change.