Backlight LED Layout for Uniform Display Edge Brightness
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Solution Overview
Problem
Existing display devices suffer from surrounding dark regions and uneven brightness due to the arrangement of light emitting elements in the backlight module, which negatively impacts display quality.
Innovation Solution
A display device design where the backlight module overlaps the display module, featuring a light emitting region with a larger area than the display region, and includes a plurality of light emitting diodes arranged to enhance brightness uniformity by expanding the light emitting region beyond the display region's edges, and varying the density and control of light emitting diodes in different unit regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light emitting elements are arranged within the display region boundaries, then the device complexity is reduced and manufacturing is simplified, but surrounding dark regions and uneven brightness occur
Solution Approach 1:
The patent extends the light emitting region from a two-dimensional plane within the display region boundaries into a third spatial dimension by projecting light outward beyond the edges. This dimensional expansion allows light to reach edge regions that would otherwise remain dark, solving the brightness uniformity problem while keeping the LED arrangement simple within the display region.
Solution Approach 2:
The patent applies different light emission characteristics to different regions: the central display region receives direct light from LEDs arranged within its boundaries, while the edge regions receive light projected outward from these same LEDs. This local differentiation ensures each region receives appropriate illumination without requiring complex additional LED arrangements.
2Illumination intensity
If the light emitting region is expanded beyond the display region, then brightness uniformity is improved and surrounding dark regions are eliminated, but the area of the backlight module increases
Solution Approach 1:
The patent introduces optical films as intermediary elements between the LEDs and the display region. These optical films redirect and distribute light from the compact LED arrangement within the display region to the edge regions, effectively expanding the light emitting region without physically expanding the backlight module area.
Solution Approach 2:
The patent uses optical films to redirect light in new directions beyond the original display region boundaries. This allows the same physical LED array to illuminate a larger effective area by changing the propagation dimension of light, rather than expanding the physical footprint of the backlight module.
3Illumination intensity
If more light emitting diodes are added to increase light output, then brightness is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent optimizes the parameters of existing LEDs (such as luminous intensity, emission angle, and wavelength) and their spatial arrangement within the display region to maximize light output and distribution. This approach achieves high brightness without increasing the number of LEDs, thereby avoiding increased device complexity.
Solution Approach 2:
The patent employs optical films as intermediaries to enhance and distribute the light from a limited number of LEDs. These optical films amplify and redirect light efficiently, allowing a smaller number of LEDs to achieve the brightness equivalent of many more LEDs arranged in complex patterns.
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 improves brightness uniformity by increasing the brightness of edge regions, addressing the issues of surrounding dark areas and uneven brightness, with the light emitting region's area difference contributing to over 50% improvement in brightness uniformity.
Implementation Method 1
The backlight module is overlapped with the display module and includes a plurality of light emitting diodes. The plurality of light emitting diodes form a light emitting region.
Data Source
AI summary
A display device including a display module and a backlight module is provided. The display module has a display region. The backlight module is overlapped with the display module and includes a plurality of light emitting diodes. The plurality of light emitting diodes form a light emitting region. The light emitting region is overlapped with the display region, and an area of the light emitting region is larger than an area of the display region.