Image Display Apparatus Thermal Deformation Control
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Solution Overview
Problem
Existing image display apparatuses face challenges in efficiently suppressing thermal deformation of planar optical members, leading to image quality deterioration and increased noise from cooling units, particularly in larger displays with narrower bezels.
Innovation Solution
The implementation of a protruding portion with first and second protruding members that define small and large allowance regions for the planar member, allowing controlled displacement and preventing excessive bending, combined with a deformation amount detection element and control unit to manage the illumination and cooling units based on detected deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bezel size is reduced to achieve a narrower frame, then the display screen size is increased, but the optical member cannot accommodate thermal expansion and bends excessively
Solution Approach 1:
The support structure is segmented into multiple spacer pins arranged at different positions and heights. The first spacer pins support the peripheral portion while the second spacer pins support the central portion, allowing differential accommodation of thermal expansion across different regions of the optical member.
Solution Approach 2:
Different regions of the optical member are provided with different support characteristics. The peripheral portion is supported by first spacer pins at a first height, while the central portion is supported by second spacer pins at a second height, creating local variations in support stiffness to manage thermal deformation patterns.
2Stability of the object's composition
If the optical member is constrained to prevent bending, then thermal deformation is suppressed, but the bezel must be sufficiently large to accommodate expansion
Solution Approach 1:
The support structure is designed to be dynamically adaptive to thermal conditions. The multiple spacer pins at different heights allow the optical member to deform locally in response to thermal expansion while maintaining overall flatness, rather than providing rigid uniform constraint that would require larger bezel accommodation.
Solution Approach 2:
The solution moves from a two-dimensional planar support problem to a three-dimensional vertical arrangement of support pins at different heights. This vertical dimensionality allows the system to accommodate thermal expansion in the thickness direction while maintaining planar flatness, reducing the need for large bezel areas.
3Temperature
If the optical member is allowed to extend freely, then thermal expansion is accommodated, but the optical member bends and image quality deteriorates
Solution Approach 1:
The deformation detection element continuously monitors the deformation state of the optical member and provides feedback to the control unit. The control unit adjusts the illumination unit's light output based on this feedback, compensating for thermal effects and maintaining image quality despite thermal expansion.
Solution Approach 2:
The system dynamically changes the illumination parameters (light output) in response to detected thermal deformation. By adjusting illumination intensity and distribution, the system compensates for the effects of thermal expansion on image quality without physically constraining the optical member.
4Temperature
If cooling units are operated at high power to suppress thermal deformation, then temperature control is improved, but noise increases
Solution Approach 1:
The deformation detection element provides real-time feedback on optical member deformation, allowing the control unit to operate the illumination and cooling units only when and to the extent necessary. This feedback-based control reduces unnecessary high-power operation, lowering noise while maintaining effective temperature management.
Solution Approach 2:
The system uses the deformation detection information to self-regulate the illumination and cooling unit operation. Rather than continuous high-power operation, the system activates and adjusts these units based on actual thermal conditions, achieving temperature control with minimal noise generation.
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 effectively limits thermal deformation, maintains image quality, and reduces noise from cooling units by allowing controlled displacement and adjusting the driving of illumination and cooling units in response to detected deformations, ensuring efficient temperature management.
Implementation Method 1
The optical member extends in a planar direction thereof due to thermal expansion resulting from a temperature rise.
Data Source
AI summary
In an image display apparatus, a protruding portion is fixed to a chassis on a back side Z2 of a planar member and protrudes towards the planar member. The protruding portion has one or more first protruding members and one or more second protruding members and defines a small allowance region and a large allowance region for the planar member. In the small allowance region, an amount of displacement of the planar member towards the chassis side is regulated at most to a first predetermined value by the one or more first protruding members. In the large allowance region, an amount of displacement of the planar member towards the chassis side is regulated at most to a second predetermined value larger than the first predetermined value by the one or more second protruding member.