OLED Pixel Capacitor Transistor Integration for Response Speed
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Solution Overview
Problem
OLED displays face challenges in achieving rapid response times due to delays in reaching target current levels for driving current, which affects the speed at which OLEDs emit light and reach desired luminance.
Innovation Solution
The implementation of a pixel structure that includes a capacitor transistor acting as a capacitor, a first transistor generating the driving current, and additional transistors and capacitors to manage signals and voltages, reducing delays by optimizing the generation and application of driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional pixel structure is used, then the manufacturing process is simpler, but the response speed of OLED is slow due to delays in reaching target current levels
Solution Approach 1:
The patent merges the capacitor function into the transistor structure by utilizing the channel of the capacitor transistor as one electrode and the gate electrode as the other electrode. This integration eliminates the need for separate capacitor structures, thereby improving response speed while avoiding excessive complexity in the pixel design.
Solution Approach 2:
The capacitor transistor serves dual functions: it acts as a switching transistor to control current flow and simultaneously functions as a storage capacitor to maintain voltage levels. This multi-functionality reduces the number of additional components needed, addressing the contradiction between improving response speed and maintaining manufacturing simplicity.
2Speed
If additional capacitors and transistors are added to improve response speed, then the response speed increases, but the manufacturing cost increases
Solution Approach 1:
The invention combines multiple functions into existing transistor structures. The capacitor transistor's channel serves as both a conduction path and a capacitor electrode, eliminating the need for separate capacitor fabrication processes. This merging approach improves response speed without requiring additional manufacturing steps or increasing production complexity.
Solution Approach 2:
The transistor's own channel region is utilized to provide the capacitor function, meaning the structure serves itself. The channel's physical presence and electrical properties are leveraged to create capacitance, eliminating the need for external capacitor components and reducing manufacturing costs while improving performance.
3Speed
If the pixel structure is optimized for faster response, then the response speed improves, but the device complexity increases
Solution Approach 1:
The capacitor transistor performs multiple roles within the pixel circuit: it acts as a switching element for data writing, a storage element for voltage retention, and a control element for current regulation. By making one component multi-functional, the overall circuit complexity is minimized while achieving fast response performance.
Solution Approach 2:
The patent merges the capacitor's storage function with the transistor's switching function in a single integrated structure. The channel of the capacitor transistor serves dual purposes as both a conduction channel and a capacitor electrode, reducing the total number of discrete components and simplifying the overall pixel circuit design.
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 configuration enhances the response speed of OLEDs by minimizing delays in reaching target current levels, thereby improving the speed at which OLEDs emit light and achieve desired luminance without the need for additional manufacturing processes, thus reducing manufacturing costs.
Implementation Method 1
the capacitor transistor may function as a capacitor using the activated channel as a first electrode and the gate electrode of the capacitor transistor as a second electrode
Implementation Method 2
OLEDs emit the light having a wavelength that depends on the type of organic material included in the light-emitting layer of the OLED
Data Source
AI summary
A pixel and organic light-emitting diode (OLED) display are disclosed. In one aspect, the pixel includes an organic light-emitting diode (OLED) configured to emit light based on a driving current. The OLED includes first and second electrodes. The pixel also includes a first transistor configured to generate the driving current. The first transistor includes a gate electrode, a first electrode, and a second electrode. The pixel further includes a capacitor transistor including a gate electrode configured to receive a gate turn-on voltage, a first electrode, a second electrode electrically connected to the first electrode of the first transistor. The capacitor transistor further includes a channel located between the first and second electrodes of the capacitor transistor. The channel of the capacitor transistor is configured to be activated by the gate turn-on voltage.