Planar Light Source Device Resin Frame Gaps Heat Dissipation
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Solution Overview
Problem
Planar light source devices using point light sources face issues with heat dissipation and uneven luminance, leading to reduced reliability and display quality due to the large frame size, increased number of parts, and dislocation of light sources from the desired positions on the light guide plate.
Innovation Solution
A planar light source device configuration that includes a light guide plate, a light source substrate with point light sources arranged at a predetermined interval, and a resin frame that sandwiches the substrate and bottom case, featuring gaps at positions facing the point light sources to enhance heat dissipation and maintain even luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of point light sources is increased to enhance luminance, then the luminance of the display screen is improved, but heat generated by each point light source causes the periphery to be excessively hot, lowering luminous flux and shortening service life
Solution Approach 1:
The frame is divided into multiple sections with gaps positioned between adjacent point light sources. These segmented gaps allow heat to escape from specific regions without compromising the structural integrity of the frame, enabling effective heat dissipation while maintaining device stability.
Solution Approach 2:
The frame structure is designed with non-uniform characteristics: gaps are strategically positioned only between adjacent point light sources where heat accumulation occurs, while other regions maintain continuous frame structure for structural support. This local modification allows heat dissipation precisely where needed without weakening the overall frame.
2Temperature
If gaps are provided in the frame between adjacent point light sources for heat dissipation, then heat dissipation is improved, but the frame structure becomes more complex and the number of parts increases
Solution Approach 1:
The frame is segmented into multiple sections with gaps positioned between adjacent point light sources. These gaps are integrated directly into the frame structure rather than being separate components, allowing heat dissipation without increasing the number of parts.
Solution Approach 2:
The heat dissipation function is merged into the frame structure itself by incorporating gaps directly into the frame. This eliminates the need for separate heat dissipation components, maintaining structural simplicity while achieving effective heat management.
3Illumination intensity
If point light sources are arranged discretely to form a light source, then the light source can be formed, but unevenness in luminance occurs between the proximity to a point light source and the proximity to the area between adjacent point light sources
Solution Approach 1:
The frame is designed with non-uniform gap positioning: gaps are strategically placed between adjacent point light sources where luminance uniformity needs improvement, while maintaining continuous frame structure in other regions. This local modification addresses luminance unevenness without requiring complete frame redesign.
Solution Approach 2:
The gaps in the frame act as intermediaries that mediate between the discrete point light sources. By positioning gaps between adjacent light sources, the frame structure helps distribute light more evenly across the display surface, reducing luminance unevenness while maintaining the discrete arrangement of point light sources.
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 dissipates heat from point light sources, prevents dislocation, and reduces luminance unevenness between proximity to point light sources and areas between adjacent sources, thereby improving the reliability and display quality of the device.
Implementation Method 1
a resin frame 3 that sandwiches the light source substrate 2 and the side portion of the bottom case 8 and holds the light guide plate 4
Implementation Method 2
the resin frame 3 includes a plurality of gaps 3a at positions facing the point light sources 1
Implementation Method 3
A planar light source device using a light guide plate reflects light emitted from a side light part composed of a linear light source such as a CCFL (Cold Cathode Fluorescent Lamp) or a point light source such as an LED (Light Emitting Diode) inside a light guide plate
Implementation Method 4
causes the light to be diffused in a dot pattern provided inside the light guide plate thus emitting the light in a planar shape
Data Source
AI summary
A planar light source device includes: a plurality of point light sources, each of which emits a light; a light guide plate that includes a first surface, and a second surface perpendicular to the first surface, and that is configured to guide the emitted lights incident from the first surface to be emitted from the second surface; a bottom case including a side portion substantially parallel to the first surface; a light source substrate that includes the plurality of point light sources arranged thereon at a predetermined interval, and that is arranged at a side of the first surface; a frame that sandwiches the light source substrate and the side portion of the bottom case and holds the second surface and that includes a plurality of gaps at positions facing the point light source.