Voltage Supply Circuit for OLED Pixel Internal Compensation
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Solution Overview
Problem
Conventional display devices lack a simple pixel circuit capable of internal compensation and an efficient voltage supply circuit to provide driving voltage, hindering the realization of simplified pixel structures and high pixel density.
Innovation Solution
A voltage supply circuit comprising a first node control circuit, a first control node control circuit, a second node control circuit, and a driving voltage output circuit, which control node potentials based on input signals and clock signals to output driving voltage, enabling internal compensation and high pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display device structure is used, then the device can be manufactured with existing technology, but the pixel circuit cannot achieve internal compensation and the pixel density is limited
Solution Approach 1:
The voltage supply circuit is divided into multiple independent control modules: a first node control circuit controlling a first node, a first control node control circuit controlling a first control node, and a second node control circuit controlling a second node. Each module independently controls specific nodes to generate the driving voltage waveform, enabling internal compensation while maintaining modular complexity management.
Solution Approach 2:
The circuit performs preliminary voltage preparation by controlling the first node to output a first voltage signal and the second node to output a second voltage signal before these signals are used to generate the final driving voltage. This preliminary action enables internal compensation by pre-establishing the necessary voltage conditions.
2Productivity
If pixel circuit structure is simplified for high pixel density, then the pixel density increases, but the voltage supply capability for internal compensation is insufficient
Solution Approach 1:
The voltage supply circuit performs multiple functions: it generates driving voltages for pixel circuits, provides internal compensation signals, and outputs carry signals for cascaded stages. The first node control circuit, second node control circuit, and driving voltage output circuit work together to simultaneously achieve high pixel density support and robust voltage supply capability for internal compensation.
Solution Approach 2:
The first control node acts as an intermediary element controlled by the first control node control circuit. This intermediary node mediates between the input signals and the final driving voltage output, enabling the circuit to achieve both simplified structure for high pixel density and sufficient voltage supply capability through coordinated control of the intermediary node's potential.
3Ease of manufacture
If a simple pixel circuit is used for high pixel density, then the manufacturing cost decreases, but the internal compensation function cannot be realized
Solution Approach 1:
The circuit dynamically controls the potential of various nodes through clock signals and control signals. The first node control circuit responds to clock signals to dynamically adjust the first node's potential, while the second node control circuit dynamically adjusts the second node's potential. This dynamic control enables internal compensation in a relatively simple pixel circuit structure, achieving both ease of manufacture and functional reliability.
Solution Approach 2:
The circuit implements feedback mechanisms where the potential of the first node and second node are controlled based on input signals and clock signals, and these controlled potentials are used to generate the driving voltage. The carry signal output circuit provides feedback by outputting carry signals that can be used in subsequent stages, enabling internal compensation while maintaining simple pixel circuit structure for ease of manufacture.
Data Source
AI summary
A voltage supply circuit, a voltage supply method, a voltage supply module and a display device are provided. The voltage supply circuit includes a first node control circuit, a first control node control circuit, a second node control circuit and a driving voltage output circuit. The first node control circuit controls a potential of the first node; the first control node control circuit controls the potential of the first control node; the second node control circuit controls a potential of the second node; the driving voltage output circuit is electrically connected to the second node, the driving voltage output terminal and the initial voltage terminal respectively, and is configured to control the driving voltage output terminal to output a driving voltage according to the initial voltage provided by the initial voltage terminal under the control of the potential of the second node.