Display Device Light Blocking Pattern for Transistor Protection
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Solution Overview
Problem
Display devices face degradation due to light exposure, particularly when light advances towards the rear surface, which can affect the performance and longevity of transistors in these devices.
Innovation Solution
A display device design that incorporates a light blocking pattern with a reflective material, positioned between electrodes and light emitting elements, to prevent light from reaching the transistor area, combined with a refractive index mismatch between layers to enhance light directionality and reduce rear surface exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are disposed between patterns in an emission area, then light emission functionality is achieved, but light may advance toward the rear surface causing transistor degradation
Solution Approach 1:
A light blocking pattern is introduced as an intermediary element between the light emitting element and the transistor. This light blocking pattern selectively intercepts light traveling toward the rear surface while allowing light emission functionality to proceed normally, thereby protecting the transistor from light-induced degradation without compromising the display's light emission performance
Solution Approach 2:
The harmful effect of light reaching the transistor is extracted and isolated by placing a dedicated light blocking pattern in the light path. This separates the light emission function from the transistor protection function, allowing each to operate independently - the light emitting element continues to emit light while the light blocking pattern prevents that light from reaching and degrading the transistor
2Reliability
If a light blocking pattern is added to prevent light from reaching transistors, then transistor degradation is prevented, but device structure becomes more complex
Solution Approach 1:
The light blocking pattern is merged with the existing pixel structure by positioning it within the emission area between the light emitting element and the transistor. Rather than adding a separate, standalone component, the light blocking pattern is integrated into the existing layer stack and spatial arrangement, thereby providing protection functionality while minimizing increases in overall device complexity
Solution Approach 2:
The light blocking pattern serves multiple functions simultaneously: it blocks light from reaching the transistor to prevent degradation, it is disposed within the emission area to maintain display functionality, and it can be integrated with existing pixel structures. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
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
The solution effectively prevents transistor degradation by blocking light that could cause damage, thereby improving the longevity and efficiency of the display device while maintaining high light emission directionality.
Implementation Method 1
The light blocking pattern may include a light blocking material which blocks light emitted from the first light emitting element
Implementation Method 2
Each of the first electrode and the second electrode may include a reflective material which reflects light emitted from the first light emitting element
Implementation Method 3
combined with a refractive index mismatch between layers to enhance light directionality and reduce rear surface exposure
Data Source
AI summary
A display device includes a first pattern and a second pattern, which are spaced apart from each other in an emission area. A light emitting element is disposed between the first pattern and the second pattern. A first electrode is disposed on the first pattern. A second electrode is disposed on the second pattern. A light blocking pattern is disposed under the light emitting element and between the first pattern and the second pattern.