Display Border Reduction via Masking Layer Repositioning
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Solution Overview
Problem
Incorporating displays into electronic device housings can result in bulkiness and increased size and weight due to large borders, affecting aesthetics and functionality.
Innovation Solution
The implementation of a liquid crystal display with upper and lower polarizer layers, including a color filter layer, thin-film transistor layer, and backlight structures, along with an opaque masking layer along the peripheral edge of the lower polarizer and optical films, separated by an air gap, to minimize border size and enhance display efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display structure is used in an electronic device housing, then the display can be mounted and function properly, but the housing size and weight increase due to large borders
Solution Approach 1:
The patent moves the opaque masking layer from the traditional position at the edge of the active display area to the peripheral edge of the lower polarizer, utilizing the space in the third dimension (depth/thickness) of the display structure. This dimensional repositioning allows the masking function to be performed without increasing the lateral footprint or border size of the display, thereby preventing housing enlargement while maintaining display functionality.
2Reliability
If a conventional display structure with large borders is used, then the display components can be properly contained and protected, but the device aesthetics are compromised
Solution Approach 1:
By relocating the opaque masking layer to the peripheral edge of the lower polarizer in the depth dimension of the display structure, the patent enables full containment and protection of display components without extending the lateral boundaries of the display. This eliminates or minimizes visible borders, significantly improving device aesthetics while maintaining proper component containment and protection.
3Device complexity
If the lower polarizer is made matte to serve as a diffuser layer, then the number of separate optical layers is reduced, but the polarization performance may be affected
Solution Approach 1:
The patent combines multiple functions into the lower polarizer layer by applying a matte coating that enables it to serve simultaneously as a polarizing element and a diffuser layer. This merging of functions reduces the total number of separate optical layers in the display structure while maintaining both polarization performance and light diffusion capabilities, as the matte surface properties are applied to the existing polarizer rather than requiring a separate diffuser layer.
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 configuration reduces the inactive border region, allowing for a more compact and aesthetically pleasing electronic device design while maintaining display performance.
Implementation Method 1
The matte materials in the lower polarizer may allow the lower polarizer to serve as a diffuser layer
Implementation Method 2
The optical films may include brightness enhancing films and a diffuser layer
Data Source
AI summary
An electronic device may be provided with a display such as a liquid crystal display having upper and lower polarizer layers, a color filter layer, a liquid crystal layer, and a thin-film transistor layer. The display may have backlight structures that include a light guide plate, a reflector, and optical films. An opaque masking layer may be formed in a strip that runs along a peripheral edge of the lower polarizer in the display. The lower polarizer and the optical films may be separated by an air gap. The uppermost optical film may be a brightness enhancing film. The lower polarizer may be a matte polarizer layer, a polarizer film attached to an achromatic polarizing compensating film, or a matte polarizer that is attached to an achromatic polarizing compensating film coated with a matte coating.