Bootstrap Capacitor Translucent Portions for Seal Inspection
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Solution Overview
Problem
In display devices with monolithically formed shift registers, the narrow flame region makes it difficult to inspect the seal between substrates, as the shift register elements, such as large output transistors and capacitors, obstruct the view of the seal, especially when using amorphous silicon or large panels, leading to potential adhesion issues and defective displays.
Innovation Solution
Incorporating translucent portions in the bootstrap capacitor, such as cutouts or openings in the electrodes, allows for easier inspection of the seal from the array substrate side, even with light-shielding members present, and ensures proper curing of the sealing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a shift register is monolithically formed on the array substrate with large output transistors and capacitors, then the driving capability is improved, but the flame region becomes narrow making seal inspection difficult
Solution Approach 1:
The capacitor electrode is divided into multiple segments, with certain segments removed to create light-transmitting portions. This segmentation allows light to pass through the capacitor structure, enabling inspection of the seal beneath while maintaining the capacitor's electrical functionality through the remaining electrode segments
Solution Approach 2:
The capacitor structure is modified locally by removing specific electrode segments only in regions where seal inspection is needed, while maintaining the complete electrode structure in other regions. This creates localized light-transmitting portions that enable inspection without compromising the overall capacitor performance
2Illumination intensity
If a black matrix is present on the counter substrate for light shielding, then display quality is improved, but the seal becomes invisible from the array substrate side
Solution Approach 1:
The light-transmitting portions in the capacitor electrode structure serve as an intermediary that allows light to pass through from the array substrate side, enabling visualization of the seal beneath without compromising the light shielding function of the black matrix on the counter substrate
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
Facilitates easy inspection and ensures sufficient curing of the seal, preventing adhesion failures and display defects by allowing light to penetrate and cure the sealing material effectively, while maintaining a narrow flame region.
Implementation Method 1
the first electrode provided with at least one of a first cutout and a first opening, and the second electrode provided with at least one of a second cutout and a second opening facing the at least one of the first cutout and the first opening
Data Source
AI summary
The present invention provides a display device in which a seal is easily inspected. The present invention provides a display device including: a first substrate; a second substrate; and a seal, wherein the first substrate includes a shift register monolithically formed on an insulating substrate, and a plurality of bus lines, the shift register includes a plurality of cascade-connected unit circuits, the plurality of unit circuits each include a clock terminal, an output, an output transistor having one of a source and a drain connected to the clock terminal and the other of the source and the drain connected to the output terminal, and a bootstrap capacitor having a first terminal connected to a gate of the output transistor and a second terminal connected to the output terminal, the output capacitor includes a first electrode, an insulating layer on the first electrode, and a second electrode on the insulating layer, the first electrode is provided with at least one of a first cutout and a first opening, and the second electrode is provided with at least one of a second cutout and a second opening facing the at least one of the first cutout and the first opening.