Backlight Substrate Depth Sensor Segmentation
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Solution Overview
Problem
Conventional backlight substrates with integrated depth sensors suffer from deteriorated imaging quality due to films used for light uniformization, which affect the precision of depth detection.
Innovation Solution
A backlight substrate design that includes a base substrate with first light emitting elements, second light emitting elements, and depth sensors, where a diffusion layer directly contacts the light emitting surfaces to diffuse the first light, and a shielding structure with an optical filter and lens on the light receiving side of the depth sensor, allowing for accurate depth information calculation without interfering with the imaging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniformizing films are added to the backlight substrate, then display brightness uniformity is improved, but imaging quality of the depth sensor deteriorates
Solution Approach 1:
The backlight substrate is segmented into distinct functional regions: a first region containing light emitting elements for display illumination, and a second region containing depth sensors for imaging. This spatial segmentation allows the display region to use uniformizing films for brightness uniformity while the imaging region remains free from such films, preserving imaging quality.
Solution Approach 2:
Different regions of the backlight substrate are assigned different optical properties and structures. The display region incorporates uniformizing films to achieve brightness uniformity, while the imaging region maintains optical clarity without such films, allowing each region to have the local quality needed for its specific function.
2Adaptability or versatility
If multiple functional components are integrated into the backlight substrate, then device versatility is improved, but device complexity increases
Solution Approach 1:
The patent merges the display backlight function and the depth sensing function into a single integrated backlight substrate. Light emitting elements and depth sensors are combined on the same substrate, allowing the device to perform both display illumination and 3D depth detection simultaneously, thereby improving versatility without requiring separate independent systems.
Solution Approach 2:
The backlight substrate is designed as a multi-functional component that serves both as a light source for display and as a platform for depth sensing. By integrating both functions into one universal structure, the device achieves adaptability for both display and human-computer interaction applications.
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 enhances the precision of depth detection by eliminating the impact of uniformizing films on the depth sensor, enabling both effective display and human-computer interaction functions while maintaining display brightness uniformity.
Implementation Method 1
a diffusion layer in direct contact with light emitting surfaces of the plurality of first light emitting elements and configured to diffuse the first light emitted from the plurality of first light emitting elements
Implementation Method 2
configured to receive the second light emitted from the plurality of second light emitting elements and reflected by an object and determine depth information of the object based on the received second light
Data Source
AI summary
The present disclosure provides a backlight substrate, a manufacturing method thereof, and a display device. The backlight substrate includes: a base substrate; a plurality of first light emitting elements on the base substrate and configured to emit first light; a plurality of second light emitting elements on the base substrate and configured to emit second light having a different wavelength from the first light; a plurality of depth sensors on the base substrate and configured to receive the second light emitted from the plurality of second light emitting elements and reflected by an object and determine depth information of the object based on the received second light; and a diffusion layer in direct contact with light emitting surfaces of the plurality of first light emitting elements and configured to diffuse the first light emitted from the plurality of first light emitting elements.