Rollable Display Burn-In Prevention via Dynamic Emission Shifting
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Solution Overview
Problem
Existing rollable display devices face challenges in preventing the burn-in phenomenon, which can lead to a reduced lifespan of the display.
Innovation Solution
The implementation of a rollable display device design that utilizes multiple rollers and motors to adjust the emission area of the display panel, allowing for partial views without causing burn-in, and maintaining a constant display area height to prevent image retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a rollable display device displays images in a rolled state, then the display area is reduced and portability is improved, but the burn-in phenomenon occurs more frequently
Solution Approach 1:
The display device dynamically adjusts the display area using multiple rollers and motors to move the emitting region. By making the display area movable rather than fixed, the system can shift the emission region to different areas of the flexible substrate, preventing static burn-in while maintaining reduced volume when rolled.
Solution Approach 2:
The flexible substrate is divided into multiple potential display regions. Instead of using the entire substrate as one fixed display area, the system segments the usable display space and can selectively activate different regions, allowing the emission area to be redistributed and preventing localized burn-in accumulation.
2Adaptability or versatility
If the emission area is adjusted to prevent burn-in, then display flexibility is improved, but device complexity increases
Solution Approach 1:
Multiple rollers and motors are combined into an integrated drive system that works together to adjust the display area. The rollers are positioned at different locations (first roller at lower end, second roller at upper end, third roller for extending sheet) and coordinated through control circuits to achieve display area adjustment without requiring separate independent mechanisms for each function.
Solution Approach 2:
The roller and motor system serves multiple functions: it adjusts the display area size, positions the emitting region to prevent burn-in, and enables the display to maintain constant height during adjustment. This multi-functionality reduces the need for additional separate mechanisms, managing complexity while achieving adaptability.
3Reliability
If the display area height is kept constant, then image retention is prevented, but the adjustment range is limited
Solution Approach 1:
The system maintains constant display height in the vertical dimension while achieving area adjustment through horizontal positioning and width modification. By constraining one dimension (height) and operating in another (horizontal area distribution), the system prevents image retention while still providing adjustable display areas through the roller mechanisms.
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 effectively suppresses the burn-in phenomenon, thereby improving the lifespan of the display device and allowing for flexible adjustment of the display area.
Implementation Method 1
a first torsion spring that is wound around a rotary shaft of the first roller to be installed in the housing unit
Implementation Method 2
a display panel that is formed on a flexible substrate and includes an organic light emitting diode
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A display device according to an exemplary embodiment of the present disclosure includes a display panel having a display area, a back cover disposed on a rear surface of the display panel, a first roller which winds or unwinds the back cover and the display panel, and a second roller which is disposed above the first roller to move in a vertical direction, the back cover and the display panel being overlaid, the emission area is flexibly adjusted during the partial view to suppress the burn-in issue and improve the lifespan.