Arched Light Bar for LCD Corner Illumination
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from vignetting, or dark corners, due to the limited light emission angle of LED light sources, which affects viewing and processing of content at the corners of the screen.
Innovation Solution
The light bar in the backlight module is inclined or arched relative to the back plate, allowing light emitted by the light emitting units to be shifted to the corners of the display panel, with a preset angle between the optical normal and the frame plane, and heat dissipation material is used between the light bar and the back plate to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED light sources are positioned on a straight circuit board to form a light bar, then the manufacturing process is simple and the structure is easy to assemble, but the light emitted cannot reach the corners of the display panel, causing vignetting (dark corner) effect
Solution Approach 1:
The light bar is designed with an arched shape instead of a straight configuration. This curvature allows the light emitting units to be positioned at different angles and distances relative to the display panel, enabling light to reach the corner regions more effectively and eliminate the vignetting effect while maintaining manufacturing simplicity
Solution Approach 2:
The light bar transitions from a one-dimensional straight line to a two-dimensional arched structure. This dimensional change allows the light emitting units to cover a broader spatial area and redirect light paths to reach corner regions that would be inaccessible from a straight configuration
2Illumination intensity
If the light bar is made arched or inclined, then the light coverage to corners is improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The light bar adopts a simple arched shape that can be easily formed during manufacturing. This curved design improves corner illumination by redirecting light paths without requiring complex multi-component structures, maintaining manufacturing feasibility while achieving better light distribution
Solution Approach 2:
The invention optimizes parameters such as the arch radius, light emitting unit spacing, and inclination angles to achieve optimal corner coverage. By carefully selecting these parameters within specific ranges, the system achieves improved illumination without excessive structural complexity
3Illumination intensity
If the light emitting units are positioned to cover corners, then the display uniformity is improved, but the heat dissipation becomes more challenging
Solution Approach 1:
Heat dissipation material is introduced as an intermediary between the light bar and back plate. This material facilitates thermal transfer from the light emitting units to the back plate, effectively managing the heat generated by the LEDs while allowing the arched light bar configuration to maintain optimal positioning for corner coverage
Solution Approach 2:
The back plate serves multiple functions: it provides structural support, enables heat dissipation through thermal contact with the light bar, and acts as a mounting surface. The heat dissipation material enhances the thermal management function while the overall design maintains the improved light distribution geometry
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 effectively avoids dark corner areas, improving the display effect and making it more conducive to viewing and observing by ensuring uniform light coverage across the display panel.
Implementation Method 1
the light emitting units near two ends of the back plate on the light bar are correspondingly in arc-shaped distribution, and the portions of light emitted by the light emitting units near two ends of the back plate are shifted to corners
Implementation Method 2
heat dissipation material is filled between the light bar and the back plate
Data Source
AI summary
A display device is provided. The display device includes a display panel, a frame including a back plate therein, a backlight module including a light source used for emitting light to the display panel. The light source includes a light bar with a plurality of light emitting units. The light bar is fixed on the back plate, and the light bar is oppositely disposed on the back plate, so that portions of light emitted by the light emitting units near two ends of the back plate on the light bar are shifted to corners of the display panel correspondingly.