Backlight Control for Display Power Reduction
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Solution Overview
Problem
High-performance display devices with increased screen definition and color reproduction range lead to higher power consumption, necessitating techniques to reduce energy usage while maintaining image quality.
Innovation Solution
A display device comprising an image display panel with subpixels for primary colors and a fourth color to enhance luminance, along with a control unit that calculates required luminance values, determines light source lighting amounts, and generates output signals to drive the subpixels, optimizing backlight control for reduced power consumption and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the screen definition and color reproduction range are increased to improve display performance, then image quality is improved, but power consumption increases
Solution Approach 1:
The display surface is divided into multiple blocks, and the backlight is segmented into multiple independently controllable light sources corresponding to each block. This allows selective illumination of only those blocks that require high luminance, rather than illuminating the entire display surface at maximum brightness, thereby reducing overall power consumption while maintaining high definition and color reproduction where needed.
Solution Approach 2:
Different luminance levels are applied to different blocks based on the local image content requirements. Blocks displaying dark or low-luminance images receive reduced backlight intensity, while blocks requiring high luminance for displaying bright or vivid content receive full intensity. This local quality adjustment maintains image quality in critical areas while saving energy in less demanding areas.
2Use of energy by moving object
If the luminance of the backlight is decreased to reduce power consumption, then energy usage is reduced, but image quality deteriorates
Solution Approach 1:
The backlight luminance is dynamically adjusted based on the actual image content being displayed. The control unit analyzes the luminance distribution of the input image and dynamically modifies the backlight intensity for each block in real-time. This dynamic adjustment ensures that the backlight provides sufficient luminance only when and where needed, preventing both energy waste and image quality degradation.
Solution Approach 2:
The system incorporates feedback mechanisms where the control unit continuously monitors the image content and adjusts the backlight luminance accordingly. By analyzing the luminance distribution information of the displayed image, the system provides feedback to optimize backlight performance, ensuring that image quality is maintained while minimizing power consumption through intelligent luminance regulation.
3Ease of manufacture
If uniform backlight luminance is applied across the entire display surface, then manufacturing is simplified, but power consumption increases and image quality is compromised
Solution Approach 1:
The backlight is divided into multiple independently controllable segments or light sources, each corresponding to a specific block of the display surface. This segmentation enables selective control of luminance in different regions, allowing the system to simplify manufacturing by using standard components while achieving sophisticated luminance management through independent control of each segment, thereby reducing power consumption without compromising image quality.
4Manufacturing precision
If the luminance of each pixel is precisely controlled to improve image quality, then image quality is improved, but device complexity increases
Solution Approach 1:
The display surface is divided into multiple blocks, and the backlight is segmented into corresponding light sources. This segmentation simplifies the control system by reducing the granularity of control from individual pixels to block-level regions. Each light source controls the luminance of its corresponding block, which contains multiple pixels. This approach maintains sufficient luminance control precision for image quality while significantly reducing device complexity compared to controlling each pixel individually.
Data Source
AI summary
In a display device, pixels each including first to fourth subpixels that respectively display first to third primary colors and fourth color are arranged on an image display panel. A lighting unit emits light to the panel from the rear thereof. A control unit calculates a required luminance value for each block of the display surface of the panel based on an input image signal, determines a light source lighting amount of the lighting unit based on luminance distribution information on the lighting unit so as to satisfy the required luminance value, generates luminance information on each pixel based on the luminance distribution information and light source lighting amount, generates an output image signal that drives the subpixels based on the luminance information and input image signal, controls the lighting unit by the light source lighting amount, and controls the panel by the output image signal.