Pixel Circuit Segmentation for Display Stability
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Solution Overview
Problem
Existing display devices face challenges in maintaining reliable display quality due to changes in transistor characteristics, such as mobility and threshold voltage, which can affect the consistency and efficiency of light emission.
Innovation Solution
The display device incorporates a specific pixel structure that includes a light emitting device, driving and scan transistors, capacitors, and shared transistors, connected in a manner that allows for independent control of the driving current and light emission, regardless of transistor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel structure with simple transistor connections is used, then the device complexity is low, but the display quality reliability deteriorates due to transistor characteristic changes
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks: a driving transistor for current control, a scan transistor for signal input, a shared transistor for capacitance control, and separate capacitors (first capacitor connected to data line, second capacitor connected to reference voltage line). This segmentation allows each component to independently manage specific functions, ensuring display quality reliability despite transistor characteristic variations.
Solution Approach 2:
The first and second capacitors act as intermediary elements that store and maintain voltage levels independently of transistor characteristics. The first capacitor maintains the data signal voltage, while the second capacitor maintains the reference voltage, serving as mediators that decouple the light emitting device from direct dependence on transistor performance variations.
2Adaptability or versatility
If transistors with fixed characteristics are used, then the manufacturing precision is easier to maintain, but the adaptability to transistor characteristic changes deteriorates
Solution Approach 1:
The circuit implements feedback through the shared transistor and capacitor arrangement. The shared transistor controls the connection between the first capacitor and second capacitor based on the actual voltage levels, automatically adjusting to compensate for transistor characteristic changes. This feedback mechanism enables the circuit to adapt to manufacturing variations without requiring high precision transistor characteristics.
3Ease of operation
If multiple separate control circuits are used for each transistor, then the control precision is high, but the device complexity increases
Solution Approach 1:
The scan transistor and shared transistor share a common control electrode that receives the scan signal, merging their control functions. Additionally, the first and second capacitors work together in a coordinated manner to maintain both data and reference voltages, reducing the need for separate control circuits while maintaining control precision through the shared control mechanism.
Data Source
AI summary
Disclosed is a display device, which includes a display panel including a plurality of pixels, and one of the plurality of pixels includes a light emitting device connected to a first reference node and that emits light, a driving transistor connected between a power supply line receiving a power supply voltage and the first reference node, a scan transistor connected between a data line receiving a data signal and the driving transistor and that receives a scan signal, a first capacitor connected between the first reference node and a second reference node, a shared transistor connected between the first reference node and the second reference node and that receives a shared control signal, and the first capacitor and the shared transistor are connected in series between the first reference node and the second reference node, and a control electrode of the driving transistor is connected to the second reference node.