Display Device Backlight Segmentation for Power Saving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices face challenges in reducing power consumption while maintaining display quality, particularly in adjusting luminance and contrast ratio efficiently.
Innovation Solution
The display device incorporates a data driver with multiple source driving circuits and light source units, allowing for a power-saving mode by turning off certain light sources during black image display and adjusting luminance through buffer groups and dimming signals, thereby reducing power consumption and enhancing contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight unit emits light at high luminance to maintain display quality, then the contrast ratio and visibility are improved, but the power consumption increases
Solution Approach 1:
The backlight unit is divided into multiple independently controllable blocks, each capable of operating at different luminance levels. This segmentation allows selective dimming of specific regions while maintaining high luminance in others, reducing overall power consumption while preserving display quality where needed.
Solution Approach 2:
The backlight system dynamically adjusts the luminance of different blocks based on the displayed image content and viewing conditions. The controller modulates block luminance in real-time, transitioning between high and low luminance states to optimize the balance between power consumption and display quality.
2Use of energy by moving object
If the backlight unit operates at low luminance to reduce power consumption, then the power consumption is reduced, but the contrast ratio and display quality deteriorate
Solution Approach 1:
By segmenting the backlight into multiple blocks with independent control, the system can maintain low overall luminance for power saving while selectively activating specific blocks at high luminance when needed for display quality, preventing uniform dimming that would degrade contrast ratio.
Solution Approach 2:
Different regions of the backlight unit are assigned different operational characteristics. Some blocks operate at low luminance for power saving, while other blocks can operate at high luminance to maintain contrast ratio in specific display regions, creating local quality variations that optimize both power consumption and display performance.
3Illumination intensity
If all light sources are turned on to maintain display quality, then the luminance and contrast ratio are improved, but the power consumption increases
Solution Approach 1:
The backlight unit is divided into multiple independently controllable blocks, allowing selective operation of only those blocks necessary for current display requirements. This segmentation enables the system to turn off unnecessary light sources while maintaining adequate luminance in active regions, reducing overall power consumption.
Solution Approach 2:
Instead of activating all light sources, the system applies partial action by enabling only the necessary subset of blocks required for current display content. This partial activation reduces power consumption while maintaining sufficient luminance and contrast ratio for the displayed image.
Data Source
AI summary
A display device includes a display panel, a timing controller, a data driver, and a light source unit. The display panel includes a plurality of data lines. The timing controller receives a control signal and image data, and outputs a data control signal, converted image data, and a mode selection signal. The data driver receives the data control signal, the converted image data, and the mode selection signal from the timing controller, outputs a data voltage to the plurality of data lines, and operates in a first mode which is a power saving mode or a second mode which is a normal driving mode in response to the mode selection signal. The light source unit includes a light source part that operates in association with a source driving circuit included in the data driver.