Pixel Circuit Layout With Fewer Scan Drivers and Lower Dead Space
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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 that includes specific transistors and capacitors, connected to power and scan lines, and emission control lines, reducing the number of scan driving circuits and minimizing dead space in the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pixel circuit configuration is simplified by reducing the number of transistors and capacitors, then the device complexity is reduced, but the display quality and response speed may deteriorate
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks with specific transistors (first through fourth transistors) and capacitors (first through third capacitors) performing distinct functions. This segmentation allows each component to be optimized for its specific role while maintaining overall circuit simplicity and display quality.
Solution Approach 2:
The emission control transistor serves multiple functions by controlling both the current flowing to the light emitting element and the charging/discharging of capacitors based on emission control signals. This multi-functionality reduces the total number of components needed while maintaining circuit performance.
2Device complexity
If the number of scan driving circuits is reduced, then the device complexity is reduced, but the area coverage and display quality may worsen due to increased dead space
Solution Approach 1:
Multiple scan driving functions are merged into a single scan driving circuit that can generate and output multiple scan signals (first scan signal, second scan signal, third scan signal) to different pixel rows. This consolidation reduces the number of separate driving circuits while maintaining full display area coverage without increasing dead space.
Data Source
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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.