Pixel Driving Circuit Voltage Conversion for Low Power Display
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Solution Overview
Problem
Conventional display devices using mini LED technology face issues with high power consumption and flickering when displaying low grayscale images due to the need for increased voltage to prevent influence on detection results, which complicates internal compensation schemes.
Innovation Solution
A pixel driving circuit and display panel design that includes a light emitting device, driving module, data writing module, voltage conversion module, and potential coupling modules, allowing the voltage of the light emitting device to be reduced, thereby reducing power consumption and enhancing compensation range without increasing the voltage of the first voltage terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage of the negative terminal of the light emitting diode is increased to prevent its influence on detection results, then internal compensation can be achieved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by performing compensation operations before the light emitting device emits light. The detection signal is generated and processed in advance during the compensation period, allowing the compensation to be completed before the actual light emission phase begins. This timing arrangement enables accurate detection without requiring elevated negative terminal voltage during operation, thereby reducing power consumption while maintaining detection accuracy.
2Reliability
If the voltage of the negative terminal of the light emitting diode is increased to prevent its influence on detection results, then internal compensation can be achieved, but the circuit complexity increases
Solution Approach 1:
The patent implements self-service by enabling the pixel circuit to perform its own compensation operations using internally available signals and components. The light emitting device itself generates the detection signal during the compensation period, and the compensation is executed within the same pixel circuit without requiring external compensation circuits or additional chips. This self-contained approach achieves accurate detection while avoiding the circuit complexity associated with external compensation schemes.
3Use of energy by moving object
If the refresh rate is reduced to display low grayscale pictures, then power consumption decreases, but picture flickering and scanning line failures occur
Solution Approach 1:
The patent applies periodic action by implementing a dual-mode driving scheme that alternates between compensation periods and light emission periods. During the compensation period, detection signals are generated and processed; during the light emission period, the display operates at the required refresh rate. This periodic structure enables low grayscale display at lower power consumption while maintaining display stability through the structured timing that prevents flickering and scanning line failures.
Data Source
AI summary
The present application provides a pixel driving circuit and a display panel. The pixel driving circuit includes a light emitting device, a voltage conversion module electrically connected to the light emitting device via a first node, a driving module electrically connected to the light emitting device via a second node, a data writing module electrically connected to the driving module via a fourth node, a first potential coupling module electrically connected to the second node and the third node, a second potential coupling module, and a first voltage terminal. Before the driving module controls a moment when the light emitting device starts to emit light, the voltage conversion module controls the potential of the first node to change from a first voltage to a second voltage, first potential coupling module couples potential of the third node, and second potential coupling module couples potential of the fourth node.