LED Display Screen Light-Shielding Grid for Uniform Illuminance
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Solution Overview
Problem
Traditional LED large-screen displays suffer from non-uniform brightness distribution and a strong sense of granularity due to the large distance between LED lamp beads, leading to dazzled viewers and suboptimal image quality.
Innovation Solution
The implementation of a matrix light-shielding frame with a hollow grid array, which can be spaced apart from or in contact with a diffusion film, allows light from LED lamp beads to illuminate the diffusion film, thereby increasing illuminance uniformity and pixel filling rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between LED lamp beads is increased, then the pixel size can be reduced, but the brightness distribution becomes non-uniform and granularity increases
Solution Approach 1:
A light-shielding frame with light-transmitting portions is introduced as an intermediary component between the LED lamp beads and the diffusion film. This frame structure selectively transmits light in specific directions while shielding other areas, enabling precise control of light distribution to achieve uniform brightness even with reduced pixel spacing
Solution Approach 2:
The light-shielding frame employs local quality by having different optical properties in different regions: light-transmitting portions allow light passage to illuminate specific areas of the diffusion film, while light-shielding portions block light to create dark regions. This spatial variation in optical properties enables precise local control of brightness distribution across the display screen
2Quantity of substance
If the LED lamp bead size is reduced to increase pixel density, then more pixels can be displayed, but the filling rate decreases and granularity becomes stronger
Solution Approach 1:
The invention transitions from controlling pixel density solely in the horizontal plane to utilizing the vertical dimension through the light-shielding frame structure. By controlling light transmission in the vertical direction through the frame's light-transmitting and shielding portions, the system achieves effective pixel density increase without sacrificing filling rate
Solution Approach 2:
The light-shielding frame is segmented into multiple light-transmitting portions corresponding to individual pixels, with each segment controlling light distribution for its associated LED lamp bead. This segmentation enables independent optimization of each pixel's light output while maintaining overall high pixel density
3Device complexity
If traditional LED arrangement is used, then the structure is simple, but frame-like dark streaks appear and illuminance uniformity deteriorates
Solution Approach 1:
The invention changes the optical parameters of the system by introducing the light-shielding frame with specific light-transmitting portions. This modifies the light distribution pattern from the traditional uniform LED arrangement to a controlled pattern where light intensity and direction are optimized to eliminate frame-like dark streaks while maintaining overall 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
This configuration enhances the uniformity of light distribution across the LED display screen, improving the visual experience by reducing frame-like dark streaks and increasing the pixel filling rate, resulting in a smoother and more uniform display appearance.
Implementation Method 1
a diffusion film arranged at a light-exiting side of the LED array
Implementation Method 2
a matrix light-shielding frame arranged between the LED array and the diffusion film
Data Source
AI summary
Disclosed is an LED display screen, including an LED array including LED light emitting units and arranged on a substrate, a diffusion film arranged at a light-exiting side of the LED array, and a matrix light-shielding frame arranged between the LED array and the diffusion film. A hollow grid array including hollow grids is included. The hollow grids correspond one-to-one to the LED light emitting units and a projection of each hollow grid on the substrate surrounds a corresponding one of the plurality of LED light emitting units. Light emitted from the LED array can pass through a projection region of the matrix light-shielding frame on the diffusion film and exiting therefrom.