Backlight Light Source Groups for Display Visibility
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Solution Overview
Problem
Existing display devices struggle to maintain optimal image visibility in high ambient illuminance conditions, as there is a limit to the increase in image brightness by simply increasing the luminance of light sources overlapping the image.
Innovation Solution
A display device with a backlight comprising multiple light sources arranged in a matrix, where a control circuit adjusts the lighting state based on illuminance thresholds, turning on specific light source groups and peripheral light sources to enhance image luminance and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of light sources overlapping the image region is increased to improve image visibility in high ambient illuminance, then the image brightness is improved, but the power consumption increases significantly
Solution Approach 1:
The backlight is divided into multiple light source groups, each corresponding to a specific image region. The control circuit selectively activates only the light source groups needed for the current display content, rather than illuminating the entire backlight uniformly. This segmentation allows precise control of illumination where needed while leaving other regions dark, resolving the contradiction between image brightness and power consumption.
Solution Approach 2:
Different regions of the backlight are assigned different illumination states based on the display content. When an image is displayed in a specific region, only the corresponding light source group is activated, creating local illumination quality tailored to the display needs. This local quality approach ensures that power is consumed only in the necessary areas, not across the entire backlight.
2Use of energy by moving object
If only the light sources overlapping the image region are turned on to reduce power consumption, then the power consumption is reduced, but the image luminance is insufficient in high ambient illuminance conditions
Solution Approach 1:
The control circuit dynamically adjusts the illumination state of light source groups based on real-time conditions including ambient illuminance levels and display content. When ambient illuminance is high, the system can activate additional light source groups or increase their luminance to compensate. This dynamic adaptation allows the system to maintain adequate image luminance while optimizing power consumption based on actual viewing conditions.
Solution Approach 2:
The system uses an illuminance sensor to detect ambient light conditions and provides feedback to the control circuit. Based on this feedback, the control circuit adjusts the luminance and activation state of light source groups accordingly. This feedback mechanism ensures that image luminance remains sufficient in high ambient illuminance while avoiding unnecessary power consumption when ambient light is already adequate.
3Reliability
If the backlight illuminates the entire display region uniformly, then the image visibility is maintained, but the power consumption increases and heat generation occurs
Solution Approach 1:
The backlight is segmented into multiple independently controllable light source groups corresponding to different display regions. Instead of uniform illumination, only the segments requiring illumination are activated based on the displayed content. This segmentation maintains image visibility in active regions while eliminating power consumption and heat generation in inactive regions.
Solution Approach 2:
The system discards illumination in regions where no image is displayed or where ambient light provides sufficient visibility. By selectively turning off light source groups in inactive regions, the system recovers the energy that would otherwise be wasted, while maintaining adequate image visibility in active regions through targeted illumination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively increases the luminance of image regions, especially in high ambient illuminance, thereby improving image visibility and reducing power consumption by optimizing light source usage.
Implementation Method 1
an illuminance sensor that detects illuminance of incident light
Implementation Method 2
a backlight that is located behind the display panel and illuminates the display panel; the backlight includes multiple light sources arranged in a matrix
Data Source
AI summary
In a display device, a display panel displays a first image in a first image region in a display region. An illuminance sensor detects illuminance of incident light. The backlight includes multiple light sources arranged in a matrix. The plurality of light sources include a first light source group constituted by at least one light source that overlaps the first image region, and a first peripheral light source group constituted by at least one light source located on the periphery of the first light source group. The control circuit allows the backlight to turn on the first light source group when the illuminance is less than a first threshold. The control circuit allows the backlight to turn on the first light source group and at least one light source of the first peripheral light source group, when the illuminance is greater than or equal to the first threshold.