Backlight Assembly with Asymmetric LED Arrangement
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Solution Overview
Problem
Display apparatuses using liquid crystal or electrophoretic panels suffer from color defects due to the limited orientation angle of light-emitting diodes (LEDs), resulting in discontinuous color patterns on the display area.
Innovation Solution
A display apparatus design featuring a light source part with alternately arranged first and second light sources of different colors, and a light guide plate with varying distances between light sources and the incident surface, ensuring a wider light coverage area to prevent color defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LEDs with uniform orientation angle are used as light source, then the device complexity is reduced, but the light emitted area coverage is limited causing color defects
Solution Approach 1:
The light source is segmented into multiple LEDs with different orientation angles arranged in a specific pattern. Instead of using a single type of LED, the patent divides the light source into first and second LEDs that emit light in different directions, thereby expanding the overall light coverage area while maintaining a relatively simple structure.
Solution Approach 2:
The patent employs asymmetric arrangement of LEDs with different orientation angles. The first and second LEDs are positioned and oriented asymmetrically to ensure that their light emission patterns complement each other, covering areas that a single symmetric LED configuration could not achieve, thus solving the color defect problem.
2Stability of the object's composition
If alternating arrangement of different color LEDs is used, then color uniformity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by assigning different orientation angles and positions to different LEDs based on their specific locations in the array. Each LED's orientation is optimized for its local position, with edge LEDs having different orientations compared to center LEDs, thereby achieving overall color uniformity while allowing for practical manufacturing tolerances.
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 prevents color defects on the display panel, enhancing display quality by ensuring uniform light distribution and mixing of colors across the display area.
Implementation Method 1
a light guide plate guiding the light from the light source part
Implementation Method 2
a light guide plate guiding the light from the light source part
Data Source
AI summary
A display apparatus includes a light source part, a light guide plate, and a display panel. The light source part includes first light sources and second light sources alternately arranged to emit a light having a color different from a color of a light emitted from the second light sources. The light guide plate includes an incident surface having at least one light incident surface facing the light source to guide the light. The display panel receives the light from the light guide plate to display an image. A distance between end portions of the incident surface and the first and second light sources disposed and corresponding to each end portion of the light incident surface is different from a distance between a center portion of the light incident surface and the first and second light sources disposed and corresponding to the center portion.