Optical Sheet Fixing Structure for Rotating LCD Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display apparatuses face issues with non-uniform expansion of optical sheets due to rotation, leading to creases on the screen.
Innovation Solution
A display apparatus structure that fixes the optical sheet using a sheet fixer with elastic projections and deformable parts, allowing uniform expansion even when the display is rotated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a liquid crystal display device is turned off, then power consumption is reduced, but the liquid crystal molecules remain in a tilted state causing image retention and requiring higher voltage to switch
Solution Approach 1:
The patent applies preliminary action by introducing a pre-tilt layer that pre-orients liquid crystal molecules at a specific angle (different from the normal tilt angle) before voltage is applied. This pre-orientation facilitates easier switching when power is restored, reducing the voltage required and improving switching performance after the device has been off. The pre-tilt layer prepares the molecules in advance for the upcoming switching operation, resolving the contradiction between power savings and switching reliability.
2Use of energy by moving object
If a liquid crystal display device is turned off for a long period, then power saving is achieved, but the liquid crystal molecules remain in a tilted state causing image retention phenomena
Solution Approach 1:
The pre-tilt layer performs preliminary orientation of liquid crystal molecules at a controlled angle, which facilitates rapid and uniform switching when power is restored. This pre-prepared state prevents the molecules from remaining in random tilted positions that cause image retention, thereby eliminating the harmful effect while maintaining power savings.
Solution Approach 2:
The patent changes the orientation parameter of liquid crystal molecules by introducing a pre-tilt layer with a specific tilt angle different from the normal operating tilt angle. This parameter change ensures that molecules are pre-positioned for optimal switching behavior, preventing image retention phenomena after prolonged power-off periods while maintaining energy efficiency.
3Ease of operation
If a pre-tilt layer is introduced to facilitate switching, then switching ease is improved, but device structure becomes more complex
Solution Approach 1:
The pre-tilt layer is merged with the existing liquid crystal display structure, integrating the preliminary orientation function into the standard device architecture. By combining the pre-tilt layer with the liquid crystal layer and alignment layers, the patent achieves improved switching ease without significantly increasing overall device complexity, as the pre-tilt functionality is incorporated within the existing structural framework.
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
Prevents creasing of the optical sheet by enabling uniform expansion, maintaining image quality regardless of the display's orientation.
Implementation Method 1
a pre-tilt layer for pre-orienting the liquid crystal molecules in the liquid crystal layer at a predetermined tilt angle
Implementation Method 2
liquid crystal display devices utilize the characteristics of liquid crystal molecules that change their orientation in response to changes in voltage applied thereto
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a display apparatus having a structure of fixing an optical sheet to allow the optical sheet to expand uniformly even when a display is rotated. The display apparatus includes a liquid crystal panel; a backlight unit arranged to supply light to the liquid crystal panel; an optical sheet provided between the liquid crystal panel and the backlight unit and having a hole formed therein; and a sheet fixer configured to fix the optical sheet, wherein the sheet fixer includes: an anti-deviation projection inserted in the hole of the optical sheet to restrict movement of the optical sheet in a first direction, and a supporting projection contacting the optical sheet to restrict movement of the optical sheet in a second direction opposite the first direction.