Prism-Layer Display Module Eliminates Light Guide Plate
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Solution Overview
Problem
Conventional edge type backlight assemblies require a light guide plate, which increases thickness and makes it difficult to design slim display apparatus, while also requiring higher brightness and uniformity of light, complicating the manufacturing process.
Innovation Solution
A display module without a light guide plate, featuring an upper prism layer and a lower prism layer with specific vertex angles, an adhesive part, and optional diffusive and polarized layers, which are integrated with the display panel to direct and distribute light efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate is used to guide light from the light source toward the display panel, then light distribution is improved, but the thickness of the display apparatus is increased
Solution Approach 1:
The invention extracts and removes the light guide plate from the backlight assembly, replacing it with a direct illumination structure where the light source is positioned adjacent to the display panel. This elimination of the LGP directly reduces the thickness of the display apparatus while maintaining light distribution through alternative means such as diffusive layers and reflective structures.
Solution Approach 2:
The invention changes the spatial arrangement from a vertical stacking configuration (light source-LGP-display panel) to a lateral or integrated configuration where the light source is positioned at the edge or adjacent to the display panel. This dimensional reorganization allows light to reach the display panel without requiring the vertical space previously occupied by the LGP.
2Illumination intensity
If the LGP includes a specific structure or prism to provide higher brightness and uniformity, then light uniformity is improved, but the thickness of the LGP is increased
Solution Approach 1:
The invention removes the need for complex LGP structures by eliminating the LGP itself. Instead of adding prisms or specific structures to thicken the LGP, the design uses simplified optical elements such as diffusive layers and reflective structures that achieve uniform light distribution without increasing thickness.
Solution Approach 2:
The invention applies optical properties locally at specific interfaces and layers rather than throughout a thick LGP. Diffusive layers are positioned strategically between the light source and display panel, and reflective structures are placed at specific locations to redirect light, achieving uniformity through localized optical modifications rather than bulk structural changes.
3Illumination intensity
If the number of light sources is increased to provide light in direct type backlight assembly, then light coverage is improved, but the thickness of the backlight assembly is increased
Solution Approach 1:
The invention segments the illumination function across multiple thin layers and components rather than using multiple thick light sources stacked vertically. The backlight assembly is divided into functional layers including diffusive layers, reflective structures, and positioning elements that distribute light from a single or few light sources across the entire display area through lateral light guidance and reflection.
Solution Approach 2:
The invention transitions from a vertical stacking arrangement of multiple light sources to a lateral light distribution approach. Light from edge-positioned sources is distributed across the display area through reflective surfaces and diffusive layers positioned in the lateral plane, eliminating the need for vertical stacking of multiple light sources that would increase 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
The solution allows for a thinner display apparatus with improved light brightness and uniformity, simplifying the manufacturing process and reducing weight and costs, while maintaining high illumination and uniformity without the need for a light guide plate.
Implementation Method 1
an upper prism layer including a plurality of upper prisms at a lower surface thereof, a lower prism layer including a plurality of lower prisms at a lower surface thereof
Implementation Method 2
an adhesive part which is at a side of the upper prism layer and is adhered to the lower prism layer and the non-display area of the display panel, wherein the adhesive part fixes the upper prism layer and the lower prism layer to each other
Data Source
AI summary
A display module includes a display panel including a display area and a non-display area, an upper prism layer including a plurality of parallel upper prisms at a lower surface thereof, wherein the plurality of the upper prisms are parallel to one another, a lower prism layer including a plurality of lower prisms at a lower surface thereof, wherein the plurality of the lower prisms are parallel to one another and extend in a substantially perpendicular direction to the upper prisms, and an adhesive part which is at a side of the upper prism layer and is adhered to the lower prism layer and the non-display area of the display panel, wherein the adhesive part fixes the upper prism layer and the lower prism layer to each other.