Dual Display Light Source Module with Inverse Prism Sheets
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Solution Overview
Problem
Current dual liquid crystal display devices require two sets of backlight modules, leading to increased size, weight, and uneven brightness when viewed from non-normal angles due to the need for separate light guide plates and light sources for each side.
Innovation Solution
A light source module comprising a light guide plate, a light source, and inverse prism sheets with adjustable prisms that refract and reflect light to emit on both sides, allowing for adjustable light angles and improved brightness from non-normal viewing positions, while using a single set of modules for double-sided display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two sets of backlight modules are used for dual display devices, then each side can have independent light control, but the size and weight of the device increase
Solution Approach 1:
The patent combines two separate backlight modules into a single integrated backlight module that can illuminate both display sides. The light guide plate is designed with light incident surfaces and light exit surfaces that enable light to be distributed to both sides of the dual display device, eliminating the need for two independent backlight modules and thereby reducing overall weight.
Solution Approach 2:
The single backlight module is designed to serve multiple functions by providing illumination for both display sides simultaneously. The light guide plate structure enables the same light source to fulfill the lighting requirements for two separate display panels, making the backlight system universal for dual-sided illumination.
2Illumination intensity
If two sets of backlight modules are used for dual display devices, then each side can have independent light control, but the device thickness increases
Solution Approach 1:
The patent merges two separate backlight modules into one integrated unit, where the light guide plate is positioned between the light source and both display sides. This consolidation significantly reduces the overall thickness compared to stacking two independent backlight modules, as the light distribution is achieved through optical design rather than physical layering.
3Device complexity
If the light emitting angles of the two screens are the same, then the optical system is simple, but the brightness is not optimal when viewed from different positions
Solution Approach 1:
The patent applies different prism configurations to different regions of the light guide plate. The first light exit surface has a first prism array with specific emission angles, while the second light exit surface has a second prism array with different emission angles. This local differentiation optimizes brightness for each viewing side without requiring complex overall system design.
Solution Approach 2:
The patent introduces asymmetric prism arrangements where the first and second prism arrays have different geometries and light emitting angles tailored to their respective display sides. This asymmetric design allows each side to be optimized for its specific viewing conditions, improving brightness performance from non-normal angles while maintaining reasonable system complexity.
4Illumination intensity
If a direct type backlight module with LEDs arranged in a two-dimensional array is used, then brightness uniformity is improved, but the module thickness increases
Solution Approach 1:
The patent transitions from a two-dimensional array of LEDs (direct type) to a one-dimensional light source combined with a light guide plate. The light source is positioned at or near the light incident surface of the light guide plate, which then distributes light across the display area. This dimensional change from 2D LED array to 1D light source with optical guidance significantly reduces thickness while maintaining brightness uniformity through the light guide plate's optical properties.
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 enhances brightness from non-normal viewing angles and reduces the thickness and weight of dual display devices by using a single light source module, achieving thinner and lighter designs with improved light distribution on both sides.
Implementation Method 1
The light guide plate has a first light exit surface, a second light exit surface opposite to the first light exit surface, and a light incident surface connected between the first light exit surface and the second light exit surface. The light source is adapted to emit light into the light guide plate through the light incident surface.
Implementation Method 2
The second light exit surface has a plurality of microstructures. The first inverse prism sheet is disposed beside the first light exit surface of the light guide plate. The second inverse prism sheet is disposed beside the second light exit surface of the light guide plate.
Implementation Method 3
The first inverse prism sheet has a first bearing surface and a plurality of first prisms, the plurality of first prisms are disposed on the first bearing surface and face the first light exit surface. Each of the first prisms has a first surface, the first surface is inclined with respect to the first bearing surface and faces away from the light source. A first included angle is formed between the first surface and the first bearing surface.
Implementation Method 4
The first inverse prism sheet has a first bearing surface and a plurality of first prisms, the plurality of first prisms are disposed on the first bearing surface and face the first light exit surface. Each of the first prisms has a first surface, the first surface is inclined with respect to the first bearing surface.
Data Source
AI summary
A light source module includes a light guide plate, a light source, a first inverse prism sheet and a second inverse prism sheet. The light guide plate has a light incident surface and opposite first light exit surface and second light exit surface. The first inverse prism sheet is disposed beside the first light exit surface, and has a first bearing surface and a plurality of first prisms. Each of the first prisms has a first surface. A first included angle is formed between the first surface and the first bearing surface. The second inverse prism sheet is disposed beside the second light exit surface, and has a second bearing surface and a plurality of second prisms. Each of the second prisms has a second surface. A second included angle is formed between the second surface and the second bearing surface. A dual display device is also provided.