Curved LCD Backlight Stepped Light Source Array
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Solution Overview
Problem
Existing curved-surface liquid crystal display devices face challenges in achieving uniform light distribution due to the difficulty in processing curved mechanical and optical components, leading to non-uniform brightness.
Innovation Solution
A backlight design with a backplane featuring stepped surfaces and light sources arranged on these surfaces, where the distance between light sources and the base plate varies to match the curvature of the display screen, allowing for uniform light distribution without bending mechanical or optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If curved mechanical structures and curved optical components are used in the backlight, then the curved-surface LCD display screen can be realized, but the fabrication difficulty increases and manufacturing precision deteriorates
Solution Approach 1:
The backlight is divided into multiple independent linear light sources arranged in an array, with each light source positioned at a different height through independent supporting members. This segmentation allows each component to be manufactured separately with standard linear components, avoiding the need to fabricate complex curved mechanical structures and curved optical components as a single integrated unit.
Solution Approach 2:
The patent introduces a vertical dimension (height) to the arrangement of light sources, positioning them at different heights above the display screen rather than arranging them in a simple planar array. This dimensional change allows linear light sources to create a curved light distribution pattern when viewed from the front, achieving the curved-surface effect without requiring the light sources themselves to be curved.
2Shape
If curved optical components are used in the backlight, then the curved-surface LCD display screen can be illuminated, but the light uniformity deteriorates
Solution Approach 1:
Each linear light source in the array is positioned at a specifically calculated height above the display screen, creating local variations in light intensity distribution. The supporting members are designed with different heights for different positions, allowing each region of the display to receive optimized illumination. This local quality adjustment compensates for the natural falloff in light intensity and achieves uniform overall illumination across the curved-surface display.
Solution Approach 2:
The patent changes the positional parameter (height) of the light sources to optimize light distribution. By adjusting the height of each supporting member and corresponding light source, the light intensity and angle of incidence are modified to compensate for curvature effects, achieving uniform illumination without requiring curved optical components that would distort light propagation.
3Ease of manufacture
If linear light sources are arranged at different heights, then the fabrication difficulty is reduced, but the device complexity increases
Solution Approach 1:
The supporting members serve multiple functions: they position the light sources at different heights, provide structural support for the entire backlight assembly, and define the vertical spacing between light sources and the display screen. This multi-functionality reduces the need for separate components, simplifying the overall structure despite the varied heights of individual elements.
Solution Approach 2:
The patent uses a repeated modular structure where identical supporting members and light source assemblies are copied across multiple positions in the array. Each module is standardized and manufactured independently, then assembled in a systematic pattern. This copying approach reduces design complexity by reusing the same components and simplifies manufacturing through standardization, even though the final arrangement creates a curved light distribution pattern.
Data Source
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AI summary
The present invention relates to a display device, and particularly to a backlight for a curved-surface liquid crystal display device and a curved-surface liquid crystal display device. The backlight comprises: a backplane which matches a curved-surface LCD display screen of the curved-surface liquid crystal display device; a supporting member which comprises a plurality of stepped surfaces parallel with a base plate of the backplane; and light sources which are arranged on each of the stepped surfaces, wherein the plurality of light sources form a curved surface projecting to one direction, and the projecting direction of the curved surface is the same as that of the curved-surface LCD display screen. In the above technical solution, due to the stepped structure, the optical distribution of light sources along the curved surface is realized without bending mechanical structures and optical components of the backlight, and the fabrication difficulty of the backlight is reduced. Meanwhile, the light sources are horizontally arranged on the stepped surfaces in the same direction, so that the light sources have the same light exiting direction, enabling the backlight to provide more uniform light, which improves the display effect of the display device.