Display Pixel Circuit Layout With Narrow Dummy Circuit Area
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Solution Overview
Problem
Existing display device layouts face challenges in reducing the arrangement area of transistors, particularly in the dummy circuit area, which occupies unnecessary space.
Innovation Solution
The display device incorporates a dummy pixel circuit with a reduced width and area by arranging it in a manner that overlaps with multiple pixel circuits, thereby minimizing the overall dummy circuit area without compromising functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dummy pixel circuit is provided in the dummy circuit area to drive the third light emitting element, then the third light emitting element can be driven properly, but the dummy circuit area occupies unnecessary space and increases the overall device area
Solution Approach 1:
The dummy pixel circuit is merged with adjacent pixel circuits by making its width smaller than the width of pixel circuits in the display area. This allows the dummy pixel circuit to be integrated into the existing pixel circuit structure, sharing common elements such as scan lines and reducing the need for separate dedicated space for the dummy circuit.
Solution Approach 2:
The dummy pixel circuit is positioned in the dummy circuit area which is adjacent to the display area, utilizing the space in the non-display region. By reducing the width of the dummy pixel circuit in the second direction (crossing the first direction), the design effectively uses the available space in the dummy circuit area without expanding the overall device footprint.
2Ease of manufacture
If the dummy pixel circuit has the same width as regular pixel circuits, then it is easier to manufacture with uniform processes, but it increases the dummy circuit area and reduces space utilization
Solution Approach 1:
The dummy pixel circuit is designed with different dimensions than regular pixel circuits. Specifically, its width in the second direction is made smaller than the width of pixel circuits in the display area, while its length in the first direction remains comparable. This local variation in dimensions allows for optimized space utilization in the dummy circuit area while maintaining compatibility with the overall manufacturing process.
3Area of stationary object
If the dummy pixel circuit area is reduced by making the dummy pixel circuit narrower, then space utilization is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The dummy pixel circuit shares common elements with regular pixel circuits, such as scan lines and transistor structures. By using the same basic building blocks and process steps for both dummy and regular pixel circuits, the manufacturing precision requirements are standardized. The width reduction of the dummy pixel circuit is achieved through standard layout design rules rather than requiring special high-precision manufacturing processes.
Data Source
AI summary
A display device includes: a first light emitting element; a third light emitting element adjacent to the first light emitting element in a first direction; second light emitting elements respectively adjacent to the first and third light emitting elements in a second direction crossing the first direction; first pixel circuits respectively under the first and third light emitting elements; second pixel circuits respectively under the second light emitting elements; and a dummy pixel circuit in a dummy circuit area adjacent to a display area in which the first, second, and third light emitting elements and the first and second pixel circuits are arranged and connected to the third light emitting element, wherein the dummy pixel circuit has a width smaller than a width of each of the first pixel circuits in the second direction.