Reflective Pixel Circuit Layout for Higher Light-Output Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving effective light emission and efficient manufacturing processes, particularly in the integration of light emitting diodes (LEDs) into display elements.
Innovation Solution
A display device structure is proposed, comprising a substrate with a display element layer and a pixel circuit layer. The display element layer includes a light emitting element connected to contact electrodes and a reflective layer that reflects light emitted from the light emitting element towards the substrate's surface. This structure enhances light emission efficiency and simplifies the manufacturing process by reducing the number of required masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional display device structure is used, then the manufacturing process requires multiple masks, but this increases manufacturing complexity and costs
Solution Approach 1:
The patent combines multiple functional layers into a single integrated structure. The display element layer is formed to simultaneously provide light emission functionality and define the pixel structure, eliminating the need for separate mask patterns for different functions. This merging of functions reduces the number of manufacturing masks required while maintaining device performance.
Solution Approach 2:
The display element layer serves multiple purposes: it acts as both the light emitting structure and the pixel definition structure. By making this layer multi-functional, the patent eliminates the need for separate dedicated layers for each function, thereby reducing manufacturing complexity and the number of masks needed in the fabrication process.
2Productivity
If light is emitted directly from the light emitting element, then the structure is simple, but light emission efficiency is insufficient
Solution Approach 1:
The patent introduces a reflective layer as an intermediary component between the light emitting element and the external environment. This reflective layer redirects light that would otherwise be lost, directing it toward the viewing direction. The addition of this intermediate layer significantly improves light emission efficiency while adding minimal structural complexity.
3Ease of manufacture
If the display element layer and pixel circuit layer are integrated, then manufacturing is simplified, but light emission effectiveness may be compromised
Solution Approach 1:
The patent applies local quality by positioning the reflective layer specifically beneath the light emitting element in the display element layer, while the pixel circuit layer remains integrated above. This localized enhancement of light reflection occurs only where needed for light emission, without interfering with the integrated manufacturing structure. The local application of the reflective function maintains both manufacturing simplicity and light emission effectiveness.
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 proposed structure effectively enhances light emission by utilizing a reflective layer to direct light towards the substrate's surface, improving the display device's performance and reducing manufacturing complexity and costs.
Implementation Method 1
The reflective layer may reflect the light emitted from the light emitting element toward a second surface of the substrate
Data Source
AI summary
A display device includes a substrate, a display element layer disposed on a first surface of the substrate and including a light emitting element that emits light, and a pixel circuit layer disposed on the display element layer and including a transistor electrically connected to the light emitting element. The display element layer includes a first contact electrode electrically connected to a first end of the light emitting element, and a second contact electrode electrically connected to a second end of the light emitting element. The pixel circuit layer includes a reflective layer disposed on the display element layer and overlapping the light emitting element. One of the first contact electrode and the second contact electrode is electrically connected to the transistor. The reflective layer reflects the light emitted from the light emitting element toward a second surface of the substrate.