LCD Screen Heating Subsystem for Cold-Start Image Stability
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Solution Overview
Problem
Virtual and augmented reality headsets, particularly those with LCD screens, experience image inconsistencies such as blurring and double images due to decreased pixel response times at lower temperatures, leading to a sub-optimal user experience in colder conditions.
Innovation Solution
A heating subsystem is introduced that accelerates the heating of LCD screens by increasing the operating speed of electronic components and using a thermally conductive layer to efficiently distribute heat, raising the screen temperature above a threshold to maintain optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the LCD screen operates at lower temperatures, then power consumption is reduced, but pixel response time decreases leading to blurred or double images
Solution Approach 1:
The system performs preliminary heating of the LCD screen using heating elements before normal operation begins. This preliminary action ensures the screen reaches optimal temperature range, preventing pixel response issues during actual use while allowing the system to operate efficiently at lower temperatures during normal function.
Solution Approach 2:
The system dynamically adjusts the operating temperature of the LCD screen by controlling heating elements based on detected temperature and usage conditions. This allows the screen to be warmer when needed for optimal pixel response and cooler when not in use to reduce power consumption, creating a dynamic balance between the two requirements.
2Reliability
If a heating subsystem is added to accelerate heating of the LCD screen, then image consistency is improved, but device complexity increases
Solution Approach 1:
The heating elements are integrated into the existing display structure, combining the heating function with the display assembly. This merging approach adds heating capability while minimizing the increase in overall device complexity by sharing structural components and integration pathways with the existing display system.
Solution Approach 2:
The system uses its own electronic components and processing unit to control the heating subsystem, rather than requiring external control systems. The processor that already manages display content also manages heating control, allowing the system to serve its own temperature control needs without adding independent control infrastructure.
3Speed
If the operating speed of electronic components is increased to generate additional heat, then heating rate is improved, but energy consumption increases
Solution Approach 1:
The system uses periodic or pulsed operation of electronic components to generate heat in controlled intervals rather than continuous operation. This allows the components to generate necessary heat for warming the LCD screen while having rest periods that reduce overall energy consumption, creating a periodic pattern that balances heating needs with energy efficiency.
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 solution rapidly brings the LCD screens to desirable operating temperatures, reducing or eliminating image inconsistencies and enhancing user experience in various environments, including colder conditions.
Implementation Method 1
a thermally conductive layer disposed between the at least one electronic component and the LCD screen
Implementation Method 2
The heating element may be include a portion of a heating film overlapping at least a portion of a surface of the LCD screen
Data Source
AI summary
A display system may include 1) a plurality of electronic components, 2) an LCD screen that is heatable at a base heating rate by operation of the LCD screen and one or more of the plurality of electronic components, and 3) a heating subsystem for heating the LCD screen at an accelerated heating rate that is greater than the base heating rate to raise a temperature of the LCD screen above a threshold screen temperature. A head-mounted-display device may include 1) a display housing, 2) a plurality of electronic components disposed within the display housing, 3) an LCD screen disposed within the display housing, and 4) a heating subsystem for heating the LCD screen at an accelerated heating rate. Various other apparatuses, systems, and methods are also disclosed.