Display Backlight Optical Sheets Mask Scratches
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Solution Overview
Problem
Existing display apparatuses face issues with appearance deterioration due to small scratches and foreign substances on light guide plates in edge-type backlight units, and high power consumption and optical hot spots in direct-type backlight units, leading to increased costs and suboptimal display quality.
Innovation Solution
A display apparatus design featuring a light source module with light sources spaced apart from the light guide plate at regular intervals, using a printed circuit board and fixing rail to prevent dislocation, and a bottom chassis with an extension portion to support optical sheets, creating an optical distance between the light guide plate and optical sheets to improve light distribution and hide defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light guide plate is used in edge-type backlight unit, then light can be guided to display panel, but small scratches and foreign substances on light guide plate become directly visible on screen
Solution Approach 1:
The patent introduces optical sheets as intermediary elements between the light guide plate and display panel. These optical sheets act as a mediating layer that diffuses and redistributes light, thereby masking the visibility of scratches and foreign substances on the light guide plate while maintaining effective light guidance to the display panel.
Solution Approach 2:
The patent creates an optical distance (separation) between the light guide plate and the display panel by positioning optical sheets in between. This dimensional separation allows light to spread and diffuse before reaching the display panel, transforming the direct line-of-sight relationship into an indirect optical path that hides defects.
2Illumination intensity
If direct-type backlight unit with many light emitting diodes is used, then light can be directly transmitted to display panel, but power consumption increases
Solution Approach 1:
The patent segments the backlight system into distinct functional components: edge-type light emitting diodes for light generation, light guide plate for light distribution, and optical sheets for light diffusion. This segmentation allows the use of fewer, more efficiently positioned light emitting diodes compared to direct-type configurations, reducing overall power consumption while maintaining illumination quality.
3Illumination intensity
If direct-type backlight unit is used, then light can be directly transmitted to display panel, but optical distance must be secured to remove hot spots on lenses
Solution Approach 1:
The patent uses optical sheets as intermediary elements that naturally diffuse light and eliminate hot spots without requiring large optical distances. The optical sheets perform the hot spot removal function through their light-diffusing properties, allowing for a more compact device design compared to direct-type backlight units.
4Ease of manufacture
If edge type backlight unit is used, then light can be guided through light guide plate, but package and transportation costs increase to prevent scratches
Solution Approach 1:
The patent introduces optical sheets that serve as a protective preliminary layer between the light guide plate and display panel. This preliminary optical element not only masks visible scratches but also provides a buffer that reduces the need for extremely careful packaging and handling of the light guide plate during transportation.
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 design reduces the visibility of scratches and foreign substances, decreases power consumption, and enhances display quality by ensuring uniform light distribution, thereby reducing manufacturing costs and improving the appearance of the display.
Implementation Method 1
The light guide plate may change the direction of light emitted from the light emitting diodes and guide it to a display panel
Implementation Method 2
optical sheets disposed between the light guide plate and the display panel
Data Source
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AI summary
A display apparatus includes a display panel, a light guide plate configured to guide light to the display panel, a light source module configured to emit light toward the light guide plate, optical sheets disposed between the display panel and the light guide plate, a bottom chassis, on which the light guide plate is seated, and configured to support the optical sheets to be spaced apart from the light guide plate forming an optical distance between the optical sheets and the light guide plate, and a plurality of supporters fixed to the bottom chassis and configured to support the optical sheets to prevent the optical sheets from sagging.