Flexible Display Transparent Window Bending Reliability
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Solution Overview
Problem
Conventional flexible display apparatuses suffer from defects in the light-emitting elements due to cracking of the insulating layer when bent, leading to reduced yield and reliability, especially in areas where OLEDs are disposed on both bending and non-bending surfaces.
Innovation Solution
A flexible display apparatus design featuring a first display unit on one surface with a transparent area at the bending area, allowing light from a second display unit on the opposing surface to pass through, utilizing a transparent window defined in the insulating layer, and including LEDs in the second display unit to enhance reliability and image display capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the insulating layer and light-emitting element are disposed on the flexible substrate at the bending area, then the display area is increased, but the insulating layer may be damaged by cracking during bending
Solution Approach 1:
The patent extracts the light-emitting function from the first display unit at the bending area by creating a transparent area where the insulating layer is removed or made transparent. This allows light to pass through from the second display unit on the opposite surface, eliminating the need for the first display unit's light-emitting elements at the bending area and preventing insulating layer cracking while maintaining display functionality.
Solution Approach 2:
Instead of having the first display unit emit light at the bending area, the patent inverts the approach by having the second display unit on the opposite surface emit light that passes through the transparent area of the first display unit. This reversal of the light emission direction allows the bending area to function without the structural constraints that cause cracking.
2Reliability
If the first display unit is made transparent at the bending area to allow light transmission, then the reliability is improved, but the light transmission capability must be maintained through the insulating layer
Solution Approach 1:
The patent extracts or removes the insulating layer at the transparent area of the first display unit located at the bending area. By taking out the insulating layer in this specific region, light can pass through freely from the second display unit without being blocked or scattered by the insulating material, thereby maintaining light transmission capability while improving reliability.
3Adaptability or versatility
If the second display unit is disposed at the transmission area to emit light, then the image display capability is enhanced, but the structural complexity increases
Solution Approach 1:
The patent applies multi-functionality by having the second display unit serve dual purposes: it displays images on the second surface and simultaneously provides light for transmission through the transparent area of the first display unit. This universal approach eliminates the need for separate light-emitting elements in the first display unit at the bending area, reducing overall structural complexity while enhancing image display capability.
Solution Approach 2:
The patent merges the light-emitting function and image display function into a single second display unit. By combining these functions, the patent reduces the number of separate components needed, particularly eliminating the need for light-emitting elements in the first display unit at the bending area, thereby reducing structural complexity while maintaining enhanced image display capability.
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 design improves the reliability and yield of flexible display apparatuses by reducing defects in the bending area and enabling effective light transmission and image display, even when the first display unit does not emit light, thereby enhancing the overall performance and durability.
Implementation Method 1
a transmission area at which light from the flexible substrate passes through the first display unit to outside the first display unit
Implementation Method 2
a first light-emitting element which generates light of the first display unit
Implementation Method 3
a second light-emitting element which is disposed at the transmission area of the first display unit and generates light of the second display unit
Data Source
AI summary
A flexible display apparatus includes: a flexible substrate including a first surface and a second surface which is opposite to the first surface; a first display unit which displays an image with light and is on the first surface of the flexible substrate, the first display unit including a transmission area at which light from the flexible substrate passes through the first display unit to outside the first display unit; and a second display unit which displays an image with light and is on the second surface of the flexible substrate, the second display unit disposed corresponding to the transmission area of the first display unit on the first surface of the flexible substrate.