Display Substrate Alignment Using Peripheral Light Emitting Film
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Solution Overview
Problem
Conventional methods for attaching a protection plate to a display substrate often result in misalignment due to the difficulty in recognizing and correcting shifts during the attachment process, and lighting the display area before shipping is undesirable.
Innovation Solution
A manufacturing method that involves forming an island-like light emitting film on the display substrate outside the display area, aligning the protection plate with the substrate using the light emitting film, and attaching the protection plate while folding back the light emitting film to ensure accurate positioning without illuminating the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external alignment is used to attach the protection plate to the display substrate, then the alignment process can be performed, but it is difficult to recognize and correct shifts during attachment
Solution Approach 1:
The patent uses a light-emitting film that changes from a non-light-emitting state to a light-emitting state to create visual contrast for alignment detection. The light-emitting film emits light in a specific color (e.g., green) that is distinct from the surrounding areas, enabling easy visual recognition and precise alignment of the protection plate with the display substrate during the attaching process.
2Measurement precision
If the display area is lit to enable alignment based on position, then alignment can be achieved, but lighting the display area before shipping should be avoided
Solution Approach 1:
The patent divides the light-emitting function into two separate components: the display area (which should remain off) and the light-emitting film (which is activated for alignment). The light-emitting film is positioned in the peripheral area outside the display area, allowing alignment to be performed using only the light-emitting film without activating the display area, thus avoiding premature display activation while achieving precise alignment.
3Reliability
If the light emitting film is formed in the peripheral area, then alignment can be performed without lighting the display area, but the light emitting film requires additional formation process
Solution Approach 1:
The patent merges the formation of the light-emitting film with the existing organic light-emitting film formation process for the display pixels. Both the light-emitting film in the peripheral area and the organic light-emitting films in the display area are formed using the same vacuum deposition process, eliminating the need for separate manufacturing steps and reducing overall process complexity while ensuring alignment reliability.
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
Enables accurate attachment of the protection plate to the display substrate without lighting the display area, allowing for precise alignment and quality determination of the organic light emitting film during the process.
Implementation Method 1
the light emitting film is made to emit light by turning on electricity
Implementation Method 2
the light emitting film is made to emit light by being irradiated with external light
Data Source
AI summary
A manufacturing method of a display device according to an embodiment of the present invention includes: the display device including a protection plate having a light transmitting part facing an input or output device, and a display substrate having a display area, a light emitting film forming the step of forming an island-like light emitting film containing a light emitting material, in an area other than the display area in the display substrate; an alignment step of aligning the protection plate and the display substrate with each other; and an attaching step of attaching the protection plate to the display substrate.