Corner Cut LCD Panel and Backlight for HMD Distortion
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Solution Overview
Problem
Head-mounted displays (HMDs) face challenges with distortion at wide field angles due to optical elements, making the corners of rectangular electronic displays undesirable, which limits the utilization and space for other components within the HMD.
Innovation Solution
The implementation of a liquid crystal display (LCD) device with a corner cut profile shape and a backlight featuring light guide portions of different widths, allowing for corner cut profiles that exclude distorted areas and provide open regions for component placement, while ensuring uniform illumination through strategically positioned LEDs and light guides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a rectangular electronic display is used in an HMD, then the display area is maximized, but distortion occurs at the corners due to optical elements at wide field angles
Solution Approach 1:
The patent extracts and removes the distorted corner portions from the rectangular display by implementing a corner cut profile. This eliminates the harmful distortion effect while preserving the useful central display area, directly resolving the contradiction between maximizing display area and eliminating corner distortion.
Solution Approach 2:
The patent applies asymmetry by cutting the corners of the rectangular display to create an asymmetric shape. This asymmetric corner cut profile eliminates the symmetric distortion pattern that occurs at all four corners, providing a practical solution to the distortion problem while maintaining adequate display area.
2Object-affected harmful factors
If corner portions of rectangular displays are excluded to eliminate distortion, then distortion issues are resolved, but the display area and space for components are reduced
Solution Approach 1:
The patent applies partial action by selectively removing only the corner portions that suffer from distortion while preserving the majority of the display area. This partial removal strategy eliminates the harmful distortion effect without excessively reducing the overall display area, achieving a balanced solution.
3Area of stationary object
If corner portions are removed to provide open regions for components, then space for components is increased, but the structural complexity of the display and backlight assembly increases
Solution Approach 1:
The patent merges the corner cut design into both the display panel and the backlight assembly, creating integrated corner cut profiles. By combining these features across multiple components, the patent simplifies the overall structure compared to adding separate complexity-creating elements, while still providing the necessary open regions for component placement.
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 enhances the usability of HMDs by eliminating distortion issues at the corners, providing additional space for components or the user's nose, and ensuring consistent illumination across the LCD panel, thereby improving the overall user experience and design efficiency.
Implementation Method 1
a first light guide portion of a light guide disposed behind the first portion of the LCD panel, the first light guide portion having the first width; a first light emitting diode (LED) disposed along a side surface of the first light guide portion to emit first light in a first direction along the first width of the first light guide portion, the first light guide portion receiving the first light from the first LED and directing the first light in a second direction toward the first portion of the LCD panel
Data Source
AI summary
A corner cut liquid crystal display (LCD) device including a LCD panel and a backlight. The LCD panel includes adjacent panel portions of different width that collectively define a corner cut profile shape for the LCD panel. The backlight includes a light guide and light sources that emit light into the light guide. The backlight directs the light from the light sources toward the LCD panel. The light guide includes adjacent light guide portions of different width that define the corner cut profile shape. Each light guide portion illuminates a corresponding LCD panel portion. The LCD device can be incorporated into a head-mounted display (HMD). The corner cut profile shapes of two adjacent LCD devices, one for the left eye and one for the right eye, may define an open region for placement of other components or parts of the user, such as the user's nose when wearing the HMD.