Display Backlight Non-Uniform Light Source Arrangement
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Solution Overview
Problem
Conventional display apparatuses face challenges in achieving uniform light emission across the entire screen due to non-uniform light source arrangements, leading to brightness differences and increased manufacturing costs and thickness.
Innovation Solution
The display apparatus employs a printed circuit board with light sources arranged in a non-uniform pattern, including two rows in a zigzag pattern, and utilizes a first and second reflecting unit with a parabolic curved surface to ensure even light distribution, eliminating the need for a light-guide plate, thereby reducing manufacturing costs and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light source is located at a side of the display panel, then the structure is simplified, but light cannot be emitted uniformly to all regions of the display panel, causing brightness differences
Solution Approach 1:
The patent applies local quality by arranging light sources non-uniformly across the display panel - with greater density at edges and corners rather than uniform distribution. This local variation in light source density compensates for the natural light decay from edge-to-center, achieving uniform overall brightness while maintaining structural simplicity
Solution Approach 2:
The patent employs asymmetry in the light source arrangement pattern, specifically positioning more light sources at the periphery and corners compared to the center region. This asymmetric distribution optimizes light coverage across the display panel surface, eliminating brightness non-uniformity without requiring a complex symmetric array of light sources
2Ease of manufacture
If conventional uniform light source arrangement is used, then manufacturing is simplified, but brightness variations occur across the screen
Solution Approach 1:
The patent implements local quality by varying the density and positioning of light sources in different regions of the display panel. Specifically, light sources are arranged with higher density at edges and corners where light intensity naturally diminishes, while using lower density in the center region, thereby achieving uniform brightness across the entire screen through region-specific optimization
3Illumination intensity
If a light-guide plate is used to achieve uniform light distribution, then light uniformity is improved, but manufacturing cost and thickness increase
Solution Approach 1:
The patent applies the extraction principle by completely removing the light-guide plate component from the backlight assembly. Instead of using a light-guide plate to achieve uniform light distribution, the invention directly arranges multiple light sources in a non-uniform pattern on the display panel, thereby achieving the desired light uniformity without the additional thickness and manufacturing cost of a light-guide plate
Solution Approach 2:
The patent uses a reflection plate as an intermediary component between the light sources and the display panel. This reflection plate redirects and distributes light from the non-uniformly arranged light sources to achieve uniform illumination across the screen, replacing the traditional light-guide plate function with a different optical mechanism that reduces overall assembly thickness
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 ensures uniform light emission across the display panel, reducing brightness variations and manufacturing costs while maintaining a thinner profile.
Implementation Method 1
the plurality of light sources are disposed at the focal point of the parabola of the reflecting surface
Data Source
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AI summary
A display apparatus includes a plurality of light sources that are arranged in several rows at different intervals so that light emitted from the plurality of light sources may reach all regions of a display panel uniformly. Accordingly, a uniform dispersion of the light incident on the display panel may be achieved. Furthermore, distribution of light generated from the plurality of light sources on the display panel may be facilitated through a reflecting unit without the use of a light-guide plate or the like.