Backlight Module Grating Light Shielding for Display Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display devices face poor display effects due to nonuniform backlight caused by the larger viewing angle of light emitted from backlight modules, which is challenging for under-screen sensing technologies, especially in full-screen designs where sensors like fingerprint sensors and cameras are integrated.
Innovation Solution
A backlight module with a first optical element that can switch between transparent and scattering states, combined with a light-shielding layer featuring gratings arranged at intervals, is used to control the light path to the liquid crystal display panel, ensuring a narrower viewing angle and improving backlight uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a backlight module with a large viewing angle is used to enable under-screen sensing, then the sensing function is achieved, but the backlight uniformity deteriorates and display effect worsens
Solution Approach 1:
The backlight module is divided into two independent light source components: a first light source component for the sensing area and a second light source component for the non-sensing area. This segmentation allows each component to be optimized for its specific function, with the first component providing sufficient light for sensing while the second maintains display quality, thereby resolving the contradiction between sensing capability and backlight uniformity
Solution Approach 2:
Different optical elements are applied to different areas of the backlight module. The first optical element is designed specifically for the sensing area to enable under-screen sensing, while the second optical element is designed for the non-sensing area to maintain display quality. This local differentiation allows each region to have optimized properties for its specific function, resolving the uniformity issue
2Illumination intensity
If the viewing angle of light emitted to the liquid crystal display panel is reduced, then backlight uniformity is improved, but the light distribution changes
Solution Approach 1:
The patent employs optical elements with specific viewing angle parameters to control light distribution. By selecting optical elements with appropriate viewing angle characteristics, the system achieves narrow viewing angle light emission that improves backlight uniformity while maintaining proper light distribution across the display panel through parameter optimization
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 reduces the viewing angle of light emitted to the liquid crystal display panel, enhancing the display effect and uniformity of backlight, thereby improving the performance of liquid crystal display devices, especially in areas with integrated sensors.
Implementation Method 1
the first optical element can switch between a transparent state and a scattering state
Implementation Method 2
the light-shielding layer is disposed on a light path of light emitted from the first light sources to the liquid crystal display panel and includes a plurality of gratings arranged at intervals
Data Source
AI summary
A backlight module and a liquid crystal display device are provided. The backlight module includes a first optical element which can switch between a transparent state and a scattering state, first light sources, and a light-shielding layer disposed on a light path of light emitted from the first light sources to a liquid crystal display panel. The light-shielding layer includes a plurality of gratings arranged at intervals, each of the gratings is made of a light-shielding material, and one light transmission gap is formed between any two adjacent gratings, thereby improving uniformity of backlight.