OLED Emission Control Driver Using Scan Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional emission control drivers for OLEDs require external control signals and separate fabrication, leading to increased production costs, complexity, and power consumption, as well as the need for different transistor types for the pixel and emission control circuits.
Innovation Solution
An emission control driver that generates emission control signals using scan signals from the scan driver without external control signals, utilizing the same type of transistors as the pixel portion, integrated into the OLED panel, simplifying the fabrication process and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an emission control driver is separately fabricated and mounted using TCP or similar methods, then the emission control function is achieved, but the production yield decreases, fabrication process becomes complicated, and production cost increases
Solution Approach 1:
The emission control driver is integrated directly into the OLED panel by fabricating the emission control circuit on the same substrate as the pixel circuits. This merging of separate components into a unified structure eliminates the need for separate fabrication and mounting processes, thereby improving production yield while maintaining the emission control function.
2Reliability
If an emission control driver is separately fabricated and mounted using TCP or similar methods, then the emission control function is achieved, but the fabrication process becomes complicated
Solution Approach 1:
The emission control driver is integrated directly into the OLED panel by fabricating the emission control circuit on the same substrate as the pixel circuits. This merging of separate fabrication processes into a single unified process simplifies the overall fabrication workflow while maintaining the emission control function.
3Reliability
If an emission control driver is separately fabricated and mounted using TCP or similar methods, then the emission control function is achieved, but the production cost increases
Solution Approach 1:
The emission control driver is integrated directly into the OLED panel by fabricating the emission control circuit on the same substrate as the pixel circuits. This merging eliminates the need for separate manufacturing steps and associated costs, thereby reducing production cost while maintaining the emission control function.
4Ease of operation
If a shift register is used as the emission control driver, then the emission control signal can be generated, but many external control signals such as CLK or CLKB are required, making the layout complicated and increasing power consumption
Solution Approach 1:
The emission control circuit is designed to generate the emission control signal autonomously using only the scan signal as input, without requiring external control signals such as clock signals. This self-service approach simplifies the layout by eliminating external signal connections while maintaining the emission control function.
5Ease of operation
If a shift register is used as the emission control driver, then the emission control signal can be generated, but external control signals are required, increasing power consumption
Solution Approach 1:
The emission control circuit is designed to generate the emission control signal autonomously using only the scan signal as input, without requiring external control signals. This eliminates the power consumption associated with external control signal generation and transmission, thereby reducing overall power consumption while maintaining the emission control function.
6Device complexity
If the emission control driver is integrated into the panel, then the fabrication process is simplified, but the emission control driver must use different transistor types from the pixel portion
Solution Approach 1:
The emission control circuit is designed to use the same p-type thin film transistor technology as the pixel circuits. This homogeneity in transistor type allows both the pixel portion and emission control driver to be fabricated using the same process, achieving both fabrication simplification and transistor type compatibility.
Data Source
AI summary
An emission control driver that applies an emission control signal for controlling an emission operation of a pixel circuit is provided. The emission control driver includes an emission control circuit with a plurality of transistors and a capacitor placed between a positive power supply voltage and a negative power supply voltage. When the driver is fabricated in an organic light emitting display (OLED), the transistors send a high level or low level emission control signal to a pixel circuit in response to a scan signal, and can be the same type transistors as the pixel circuit transistors. Further, the emission control driver may include a transistor for interrupting the positive power supply voltage in response to an initializing signal to initialize a capacitor of the pixel circuit.