Shared Data Line and Boost Capacitor for Dual-Emission OLED Panels
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Solution Overview
Problem
Organic electroluminescent display devices with dual emission capabilities face challenges in sharing data lines and power supply voltage lines between main and sub display panels, leading to increased cost and power consumption due to separate drivers and voltage requirements.
Innovation Solution
The implementation of a shared data line and power supply voltage line for main and sub pixels, utilizing a novel sub pixel structure with a boost capacitor to equalize drive current and luminance, allowing the main and sub display panels to operate with the same driver and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate drivers and voltage lines are used for main and sub display panels, then each panel can operate independently with dedicated control, but device complexity and power consumption increase
Solution Approach 1:
The patent merges the data line and power supply voltage line into a single shared line that serves both main and sub display panels. The data line carries data signals for both panels, and the power supply voltage line provides power to both panels through a common voltage application transistor, thereby reducing the number of separate drivers and voltage lines while maintaining independent operation capability through time-division multiplexing
Solution Approach 2:
The shared data line and power supply voltage line are designed to perform multiple functions: they can selectively serve the main display panel or the sub display panel based on the scan signal state. The voltage application transistor and storage capacitor work together to universally provide data and power to either panel, making the shared infrastructure capable of handling different operational modes without requiring separate dedicated lines for each panel
2Reliability
If separate drivers and voltage lines are used for main and sub display panels, then each panel can be independently controlled, but power consumption increases
Solution Approach 1:
By merging the power supply voltage lines into a single shared line with a common voltage application transistor, the patent eliminates redundant power delivery paths. The storage capacitor maintains voltage levels during idle periods, and the transistor selectively activates power delivery only when needed, reducing overall power consumption compared to having separate powered lines for each panel
Solution Approach 2:
The system uses periodic scan signals to sequentially activate either the main or sub display panel. During periods when one panel is inactive, the shared power supply line remains in a low-power state, and the storage capacitor maintains necessary voltage levels without requiring continuous power delivery. This periodic activation pattern significantly reduces average power consumption compared to continuous separate power supply
3Device complexity
If main and sub pixels share the same data line and power supply voltage line, then device complexity and power consumption are reduced, but drive current and luminance equalization becomes difficult
Solution Approach 1:
The patent introduces a boost capacitor that changes the voltage parameter dynamically based on the operational state. When the scan signal transitions from low to high level, the boost capacitor charges and increases the gate voltage of the voltage application transistor, thereby adjusting the drive current to compensate for differences between main and sub pixels. This parameter change enables equalization of luminance while maintaining the shared infrastructure
Solution Approach 2:
The storage capacitor and boost capacitor act as intermediary elements between the shared data line and the pixel circuits. These capacitors mediate the voltage and timing differences between main and sub pixels, ensuring that both pixel types receive appropriate drive signals despite sharing common infrastructure. The capacitors buffer and regulate the shared signal to maintain precision in drive current control
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
This solution enables the main and sub display panels to emit light at the same luminance with the same data voltage, reducing costs and power consumption by sharing drivers and voltage lines, while enhancing the aperture ratio.
Implementation Method 1
An electroluminescent display device (hereinafter referred to an EL display device) is an emissive device in which a fluorescent material emits light when electrons and holes recombine
Implementation Method 2
a storage capacitor having a first electrode connected to the power supply voltage line and a second electrode connected to the gate terminal of the drive transistor for temporarily storing the data voltage for a constant time
Implementation Method 3
a boost capacitor connected between the scan line and the second electrode of the storage capacitor for increasing a voltage of the gate terminal of the drive transistor in response to the scan signal converted to a high level
Data Source
AI summary
In an organic electroluminescent (EL) display device, a main display panel and a sub display panel share a data line and a power supply voltage line. The organic EL display device has a top emission type main display panel and a bottom emission type sub display panel in a single display panel. The main display panel is composed of main pixels, each having a compensation circuit for compensating a threshold voltage, and the sub pixel display is composed of basic sub pixels without any compensation circuit. Each of the sub pixels has a boost capacitor which increases a data voltage, and which is disposed between a scan line and a storage capacitor so as to use the same voltage and power supply voltage as the main pixels. The sub pixels having the boost capacitor are disposed in the sub display panel, so that the main and sub display panels share the data line and the power supply voltage line.