OLED Pixel Circuit Layout With Fewer Scan Drivers
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Solution Overview
Problem
Existing display devices face challenges in achieving improved display quality and simplified circuit configurations while maintaining fast response speed and low power consumption.
Innovation Solution
A display device with a simplified pixel circuit configuration, including specific transistors and capacitors, and a reduced number of scan driving circuits, which reduces the non-display area and enhances display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pixel circuit configuration is simplified, then the device complexity is reduced, but the display quality may deteriorate
Solution Approach 1:
The pixel circuit is divided into essential components only (light emitting element, transistor, and capacitor) by eliminating redundant circuits such as compensation circuits and emission control circuits. This segmentation approach maintains the core light emission function while reducing overall circuit complexity to the minimum necessary components.
Solution Approach 2:
Redundant circuit components and functions are extracted and removed from the pixel circuit. Specifically, compensation circuits, emission control circuits, and associated control lines are taken out, leaving only the essential elements required for light emission and basic current control.
2Area of stationary object
If the non-display area is reduced, then the area of the display device is increased, but the circuit configuration becomes more complex
Solution Approach 1:
Gate driving circuits that were previously located in the non-display area are extracted and relocated into the pixel circuit itself. Each pixel incorporates its own transistor and capacitor for scan signal control, eliminating the need for separate external gate driving circuits and thereby reducing the non-display area.
Solution Approach 2:
The gate driving functionality is merged directly into the pixel circuit structure. The scan signal control transistors and capacitors are combined with the light emitting element within the same pixel, creating an integrated design that eliminates separate driving circuit areas.
3Device complexity
If scan driving circuits are reduced, then the device complexity is reduced, but the ease of operation deteriorates
Solution Approach 1:
Each pixel circuit is self-sufficient with its own integrated transistor and capacitor for scan signal control. The pixel circuit autonomously manages the scan signals without requiring external gate driving circuits, enabling each pixel to serve itself and eliminating the need for centralized control infrastructure.
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 achieves improved display quality and reduced power consumption by optimizing the pixel circuit configuration, minimizing the non-display area, and enhancing the efficiency of scan signal utilization.
Implementation Method 1
A light emitting display device among display devices displays images by using a light emitting element that generates a light through the recombination of electrons and holes
Data Source
AI summary
A display device includes: a display panel including a pixel including: a light emitting element including an anode connected to a first power line and a cathode; a first transistor connected between the cathode and a second power line and operating according to a potential of a first node; a second transistor between the first node and a data line and receiving a first scan signal; a third transistor between the first node and a reference voltage line and receiving a second scan signal; and a first emission control transistor connected between the first transistor and the second power line, connected to a third node, and receiving a first emission control signal; a first capacitor between the first node and a second node, to which the first transistor and the first emission control transistor are connected; and a second capacitor connected between the second node and the third node.