Pixel Structure with Storage Capacitor for Voltage Stabilization
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Solution Overview
Problem
Display devices face challenges in reducing power consumption while maintaining image quality, particularly when displaying static images or varying frame frequencies, due to inefficiencies in driving current management and voltage stabilization across pixels.
Innovation Solution
The implementation of a pixel structure that includes a storage capacitor with greater capacitance than a first capacitor, along with specific transistor configurations and timing control, allows for efficient data signal delivery based on capacitance ratios, reducing power consumption and enhancing image quality by compensating for voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the driving frequency is reduced to reduce power consumption, then power consumption is reduced, but image quality and display performance deteriorate
Solution Approach 1:
The patent implements variable frame rate driving where the display device dynamically adjusts the frame rate based on image content. Static images are displayed at lower frame rates to reduce power consumption, while dynamic images maintain higher frame rates for quality. This dynamic adaptation resolves the contradiction by making the system flexible rather than fixed.
Solution Approach 2:
The patent changes the driving frequency parameter adaptively. By detecting whether displayed content is static or dynamic, the system modifies the frame rate parameter accordingly. This parameter change allows optimization of both power consumption and image quality depending on the display conditions.
2Stability of the object's composition
If multiple transistors and capacitors are added to improve voltage stabilization, then voltage stability improves, but device complexity increases
Solution Approach 1:
The storage capacitor performs preliminary action by maintaining voltage before the light-emitting element needs it. The capacitor is charged in advance during the non-emission period, ensuring voltage stability during emission without requiring complex real-time regulation circuits.
Solution Approach 2:
The storage capacitor acts as an intermediary between the data line and the light-emitting element. It buffers voltage fluctuations and provides stable voltage to the LED, simplifying the overall circuit design while improving voltage stability.
3Stability of the object's composition
If the storage capacitor capacitance is increased to improve voltage compensation, then voltage compensation improves, but the area occupied by the capacitor increases
Solution Approach 1:
The patent optimizes the capacitance value parameter of the storage capacitor to achieve effective voltage compensation with minimal area. By carefully selecting the capacitance value based on the driving current and voltage characteristics, the system achieves good compensation without excessive capacitor size.
Data Source
AI summary
A display device includes a pixel, a scan driver supplying first to third scan signals in a first non-emission period and supplying the second scan signal in a second non-emission period, an emission driver supplying an emission control signal in the first and second non-emission periods, and a data driver supplying a data signal in the first non-emission period. The pixel includes a light-emitting element, a first transistor, a second transistor connected between the data line and a second node, a first capacitor connected between the first and second nodes, a third transistor connected between a third power line and the first node, a storage capacitor connected between the first and third nodes, a fourth transistor connected between the third node and a fourth power line, a fifth transistor connected between the first power line and the first transistor, and a sixth transistor supplying a fifth supply voltage.