Backlight Module Ridge Groove Independent Luminance Control
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Solution Overview
Problem
Existing backlight modules face challenges in precisely locating an illumination target region distant from the light source during dimming, especially for one-sided lighting, and suffer from brightness interference between adjacent regions in two-sided lighting configurations, leading to inefficient power consumption and reduced contrast ratios.
Innovation Solution
A backlight module design featuring a ridge-shaped groove on the light guide plate, dividing it into independent light source domains with a driving circuit controlling the luminance of each light source unit, allowing for dynamic brightness adjustment based on predetermined luminance values and functions to minimize power consumption and enhance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light source is disposed on one side of the light guide plate, then the device complexity is reduced, but the precision of locating illumination target region distant from light source during dimming deteriorates
Solution Approach 1:
The light guide plate is divided into multiple light guide regions (first light guide region and second light guide region) separated by a groove. Each region can be independently controlled by its own light source, enabling precise localization of illumination target regions even during dimming operations.
2Illumination intensity
If light sources are disposed on two sides of the light guide plate, then the illumination uniformity is improved, but the brightness of adjacent regions interferes with each other during dimming
Solution Approach 1:
A groove is formed in the light guide plate to divide it into separate light guide regions. This physical segmentation prevents light from one region from interfering with adjacent regions, allowing independent dimming control of each region without brightness interference.
Solution Approach 2:
The groove acts as an intermediary barrier between adjacent light guide regions. It blocks the propagation of light between regions, preventing the harmful interference effect while maintaining the ability to provide uniform illumination within each region.
3Use of energy by moving object
If the light guide plate is divided into independent light source domains, then the power consumption efficiency is improved, but the device complexity increases
Solution Approach 1:
The light guide plate is segmented into multiple independent light guide regions by grooves, allowing each region to be controlled independently. This enables precise power management where only necessary regions are illuminated, significantly improving power consumption efficiency.
Solution Approach 2:
Each light guide region can have different luminance characteristics and control parameters tailored to its specific requirements. This local quality approach allows optimized power distribution across different regions, improving overall energy efficiency while maintaining structural simplicity.
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 enables precise control of luminance domains, reducing unnecessary power consumption and improving image contrast by allowing each light source unit to operate independently, effectively addressing the limitations of prior art.
Implementation Method 1
When light hits the diffusing structure of the bottom surface, the reflected light will spread out all over, destroy the total internal reflection, and emit from the front surface of the light guide plate
Implementation Method 2
The diffusing structure disposed at the bottom surface of the light guide plate guides the light to become a uniformly distributed planar light source
Data Source
AI summary
A backlight module capable of dynamically adjusting brightness is proposed. According to the present invention, a backlight module comprises a light guide plate for guiding light, a first light source unit, and a second light source unit. A ridge-shaped groove is disposed on the middle of the bottom surface of the light guide plate. The first light source unit and the second light source unit are respectively disposed at the opposite sides of the light guide plate. Both of the first light source unit and the second light source unit comprises at least one light source. Each of the light sources of the first light source unit is symmetrically arranged with each of the light sources of the second light source unit on a one-on-one basis. The ridge-shaped groove divides the backlight module into two independent luminance domains, each dividing into multiple subdomains. Actual luminance of each subdomain is adjustable based on its predetermined brightness and distributions, reducing power consumption and enhance an image contrast.