OLED Pixel Circuit Shunt Sub-Circuit Multi-Gray Scale Control
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Solution Overview
Problem
Current OLED display panels can only achieve simple gray scale display by turning the light-emitting diode on and off, making it difficult to realize multi-gray scale display due to limitations in pixel circuit layout and latch sub-circuit characteristics.
Innovation Solution
A pixel circuit comprising a control sub-circuit, a shunt sub-circuit, and a light emitting sub-circuit, where the control sub-circuit outputs data signals to the latch sub-circuit in response to scan signals, the latch sub-circuit latches and outputs signals to the light emitting sub-circuit to enable light emission, and the shunt sub-circuit adjusts light emitting brightness by shunting the second level signal, using transistors and capacitors to control current and achieve varied gray scale displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light-emitting diode is controlled to turn on and off by the switch signal line, then the simple gray scale display is realized, but the multi-gray scale display cannot be realized
Solution Approach 1:
The pixel circuit is divided into functional sub-circuits: control sub-circuit, latch sub-circuit, light emitting sub-circuit, and shunt sub-circuit. Each sub-circuit performs a specific function, allowing independent optimization and control of different aspects of the display operation.
Solution Approach 2:
The shunt sub-circuit introduces dynamic control capability by adjusting the shunt ratio through variable resistance elements, enabling continuous modulation of the light emitting current to achieve multi-gray scale display rather than simple binary on/off control.
2Manufacturing precision
If the switch signal line controls the light emitting diode to turn on and off, then the circuit layout is simplified, but the gray scale control precision is insufficient
Solution Approach 1:
The shunt sub-circuit acts as an intermediary between the latch sub-circuit and the light emitting sub-circuit, providing fine-grained control of the current by shunting excess current away from the light emitting diode, thereby achieving precise gray scale control.
Solution Approach 2:
The circuit utilizes variable resistance parameters in the shunt sub-circuit to dynamically adjust the current division ratio, enabling precise control of the light emitting current magnitude to achieve different gray scale levels.
3Adaptability or versatility
If additional sub-circuits are added to achieve multi-gray scale display, then the gray scale control is improved, but the pixel circuit area increases
Solution Approach 1:
Multiple functional elements are merged into integrated sub-circuits. For example, the shunt sub-circuit combines switching elements, resistive elements, and capacitive elements into a unified structure that performs both switching and current regulation functions.
Solution Approach 2:
The shunt sub-circuit serves multiple functions: it acts as a current regulator, a gray scale controller, and a signal distribution element, thereby achieving multi-gray scale capability without proportionally increasing circuit area.
Data Source
AI summary
A pixel circuit, a method for driving a pixel circuit and a display panel are provided. The pixel circuit includes a control sub-circuit, a shunt sub-circuit, a light emitting sub-circuit and a latch sub-circuit, where the control sub-circuit is configured to output to the latch sub-circuit a data signal from a data signal line in response to a scan signal from a scan signal line; the latch sub-circuit is configured to latch a first level signal and a second level signal in response to the data signal and the scan signal, and output the second level signal to light emitting sub-circuit in response to a switch signal from a switch signal line, to enable the light emitting sub-circuit to emit light; and the shunt sub-circuit is configured to shunt, in response to a control signal from a control signal line, the second level signal input to the light emitting sub-circuit, to adjust a light emitting brightness of the light emitting sub-circuit.