Pixel Circuit Layout With Integrated Scan Signals and Lower Power
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Solution Overview
Problem
Existing light emitting display devices have complex circuit configurations that can lead to increased power consumption and reduced efficiency due to the need for multiple scan signals and driving circuits, which also occupy significant non-display area on the panel.
Innovation Solution
A simplified circuit configuration for light emitting display devices using a reduced number of scan signals and integrated gate driving circuits, reducing the number of transistors and capacitors per pixel, thereby minimizing power consumption and non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex circuit configuration with multiple scan signals and driving circuits is used, then the display device can provide complete pixel control functionality, but the power consumption increases and the non-display area expands
Solution Approach 1:
The patent combines multiple scan signals (gate scan signal and emission scan signal) into a single integrated scan signal that is transmitted through one data line. The pixel circuit integrates multiple transistors (first transistor for gate control, second transistor for emission control, third transistor for compensation) into a unified circuit structure that receives and processes the integrated scan signal, thereby reducing the number of separate driving circuits and minimizing power consumption while maintaining complete pixel control functionality.
Solution Approach 2:
The integrated scan signal serves multiple functions simultaneously: it acts as both a gate scan signal for selecting pixels and an emission scan signal for controlling light output. The single data line that transmits this integrated signal replaces multiple separate data lines, and the pixel circuit is designed to interpret different portions of the integrated signal for different control purposes, achieving multi-functionality with reduced complexity.
2Reliability
If multiple scan signals and driving circuits are used, then comprehensive pixel control is achieved, but the non-display area increases
Solution Approach 1:
The patent merges multiple separate driving circuits into a single integrated gate driving circuit that generates and transmits both gate scan signals and emission scan signals through one data line. This consolidation eliminates the need for separate driving circuit modules, thereby reducing the non-display area occupied by driving circuits while maintaining comprehensive pixel control functionality through the integrated circuit's ability to generate multiple signal types.
Solution Approach 2:
The patent transitions from a multi-dimensional signal structure (multiple separate scan signals through multiple data lines) to a single-dimensional integrated signal structure (one integrated scan signal through one data line). This dimensional reduction allows the same control functionality to be achieved with fewer physical components, thereby minimizing the non-display area required for driving circuits and data lines.
3Use of energy by moving object
If a simplified circuit configuration with reduced transistors and capacitors per pixel is used, then power consumption is reduced and non-display area is minimized, but circuit functionality must be maintained
Solution Approach 1:
The patent extracts and eliminates redundant circuit elements from the traditional pixel structure. Specifically, it removes unnecessary capacitors and reduces the number of transistors by integrating control functions into fewer components. The remaining transistors are designed with enhanced multi-functionality, where each transistor performs multiple control tasks, thereby reducing overall component count and power consumption while maintaining necessary circuit functionality.
Solution Approach 2:
The patent changes the operational parameters of the remaining transistors and capacitors to compensate for the reduced component count. By optimizing the electrical characteristics (such as threshold voltages, capacitance values, and switching timing) of the simplified circuit elements, the patent ensures that the reduced circuit configuration maintains adequate control functionality despite having fewer components, thereby achieving lower power consumption without sacrificing essential pixel control capabilities.
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 simplified circuit configuration enhances display quality by reducing power consumption and preventing the increase in non-display area, while maintaining fast response speed and improved efficiency.
Implementation Method 1
a light emitting display device displays an image by using a light emitting diode that generates light through the recombination of electrons and holes
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A pixel in a display device includes a light emitting element connected to a first power line, a first transistor connected between a cathode of the light emitting element and a second power line, a second transistor connected between a second node and a data line, a first capacitor connected between a first node and the second node, a third transistor connected between the first electrode of the first transistor and the first node, a second capacitor connected between the second node and the first power line, and a fourth transistor that initializes the second node in response to a second scan signal during an initialization period.