Pixel Circuit Using Reference Voltage to Cut Display Power
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Solution Overview
Problem
Conventional pixel circuits drive the light emitting element based on a difference between a first power voltage and a data voltage, resulting in high power consumption.
Innovation Solution
The pixel circuit determines the driving current based on a reference voltage lower than the first power voltage, using a difference between the reference voltage and the data voltage to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving current is determined based on the difference between the first power voltage and the data voltage, then the light emitting element can be driven, but the power consumption is high
Solution Approach 1:
The patent introduces a reference voltage that is lower than the first power voltage, and determines the driving current based on the difference between the reference voltage and the data voltage. This changes the voltage parameter from using the first power voltage directly to using the reference voltage, thereby reducing the driving current and power consumption while maintaining the light emitting element's operation
2Use of energy by moving object
If the reference voltage is lower than the first power voltage, then the power consumption is reduced, but additional switching elements are required
Solution Approach 1:
The patent introduces a reference voltage as an intermediary between the first power voltage and the data voltage. This reference voltage serves as a mediator to determine the driving current, allowing the circuit to achieve lower power consumption while managing the complexity through structured voltage reference management
Data Source
AI summary
A pixel circuit includes a light emitting element, a first switching element including a control electrode connected to a first node, a first electrode connected to a second node and a second electrode connected to a third node and applying a driving current to the light emitting element, a second switching element applying the data voltage to the second node in response to a writing gate signal, a third switching element connecting the first node and the third node in response to a compensation gate signal, a capacitor including a first electrode connected to the first node and a second electrode connected to a fourth node, an eighth switching element including a first electrode receiving a reference voltage and a second electrode connected to the fourth node and a ninth switching element including a first electrode receiving a first power voltage and a second electrode connected to the fourth node.