Free-Form Display Backlight Cavities for Borderless Light Uniformity
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Solution Overview
Problem
Free-form display devices face challenges in achieving homogeneous illumination with matrix backlights, as the backlight often extends beyond the display area, leading to light leakage and the need for black printing, which conflicts with the goal of a borderless design.
Innovation Solution
A display device with a reflector having regularly shaped cavities in a grid and irregularly shaped cavities in edge regions, where light sources are arranged to match the free form of the panel, allowing for reduced installation space and adjustable brightness to ensure uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a matrix backlight with regularly shaped grid-arranged cavities is used, then the installation space is sufficient and light sources can be evenly distributed, but the backlight extends beyond the display area causing light leakage and requiring black printing
Solution Approach 1:
The patent applies local quality by differentiating the cavity shapes based on their position: regularly shaped cavities in the central region and irregularly shaped cavities in the edge regions. This allows the backlight to adapt locally to the display panel's freeform shape, preventing light leakage at edges while maintaining even light source distribution in the center.
Solution Approach 2:
The reflector is segmented into different cavity types (regular and irregular shapes) arranged in a grid pattern. This segmentation allows different regions of the backlight to serve different functions: central regions provide uniform illumination while edge regions conform to the display boundaries, eliminating the need for black printing.
2Object-generated harmful factors
If black printing is used on the cover glass to prevent light leakage, then light leakage is prevented, but the borderless design is compromised
Solution Approach 1:
The patent implements preliminary action by pre-shaping the cavities in the reflector to match the display panel's freeform geometry before light emission occurs. The irregularly shaped cavities in edge regions are designed in advance to confine light within the display boundaries, eliminating the need for subsequent black printing and preserving the borderless design.
3Shape
If irregularly shaped cavities are used in edge regions to match the display shape, then the borderless design is achieved and installation space is reduced, but homogeneous illumination becomes more difficult
Solution Approach 1:
The patent maintains illumination homogeneity through local quality by combining regular cavities in the center (for even light distribution) with irregular cavities at edges (for shape conformity). The regular central cavities ensure uniform light source spacing and intensity, while the irregular edge cavities adapt to the display boundaries without compromising overall homogeneity.
Solution Approach 2:
The backlight is segmented into central and edge regions with different cavity geometries. This segmentation allows each region to optimize its function: the central region prioritizes uniform illumination through regular cavities, while edge regions prioritize shape conformity through irregular cavities, achieving both homogeneity and borderless design.
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 provides more homogeneous illumination and reduces light leakage, enabling a borderless design by optimizing the reflector's cavity design and light source arrangement, ensuring consistent brightness across irregularly shaped display areas.
Implementation Method 1
a reflector with a plurality of regularly shaped and grid-arranged reflectively designed cavities
Implementation Method 2
a plurality of light sources arranged in the cavities
Data Source
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AI summary
The present invention relates to a display device (1) and a means of transportation with such a display device (1). The display device (1) comprises a display panel and a backlight (3) for the display panel. The backlight (3) comprises a reflector (30) with a plurality of regularly shaped, reflectively designed cavities (31) arranged in a grid. In at least one edge region (300), the reflector (30) has irregularly shaped, reflectively designed cavities (31'). Furthermore, the backlight (3) comprises a plurality of light sources (32, 32') arranged in the cavities (31).