Pixel Circuit With Single-Switch Multi-Emission Control
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Solution Overview
Problem
Current pixel circuits face issues with insufficient luminous brightness and uneven brightness due to variations in transistor threshold voltage, leading to reduced display quality, especially in low grayscale conditions, and require a simplified structure to reduce power consumption.
Innovation Solution
A pixel circuit design incorporating a light-emitting element, drive current generator, pulse width signal generator, and multiple lighting controller to adjust pulse width signals, reducing the number of switches on the drive current path and minimizing the impact of threshold voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transistors and capacitor elements are used in the pixel circuit, then the circuit can achieve multi-emission control, but the layout difficulty increases and power consumption increases
Solution Approach 1:
The patent merges the functions of multiple switches into a single switch located in the drive current path. The multiple lighting controller adjusts the pulse width signal to control the single switch, which in turn controls the drive current to the light-emitting element. This combining of multiple control functions into one switch reduces layout difficulty and simplifies the circuit structure while maintaining multi-emission control capability.
Solution Approach 2:
The single switch in the drive current path serves multiple functions: it controls the drive current for different emission periods, implements multi-emission control, and replaces what would traditionally require multiple separate switches. The multiple lighting controller provides the universal control signal that adapts the pulse width to achieve different lighting patterns, making the single switch a multi-functional component.
2Adaptability or versatility
If multiple transistors are used in the pixel circuit, then multi-emission control is achieved, but power consumption increases
Solution Approach 1:
The patent combines multiple switch functions into one switch in the drive current path, reducing the total number of active components that consume power. By controlling a single switch with adjusted pulse width signals from the multiple lighting controller, the circuit achieves multi-emission control with lower power consumption compared to using multiple separate switches.
Solution Approach 2:
The patent extracts and eliminates redundant switches from the traditional multi-emission circuit structure. By removing unnecessary switches and capacitor elements, the design reduces the number of components that consume power during operation, thereby decreasing overall power consumption while maintaining the multi-emission functionality through pulse width adjustment.
3Device complexity
If transistor threshold voltage variations are present, then the circuit structure remains simple, but luminous brightness becomes insufficient and uneven
Solution Approach 1:
The multiple lighting controller implements feedback control by adjusting the pulse width signal based on the actual lighting conditions and the control signal. This feedback mechanism compensates for transistor threshold voltage variations, ensuring that the drive current maintains the expected value and produces uniform luminous brightness across different emission periods, all while keeping the circuit structure relatively simple.
Solution Approach 2:
The patent uses dynamic pulse width adjustment to compensate for threshold voltage variations. The multiple lighting controller dynamically modifies the pulse width signal in response to different control signals, allowing the drive current to adapt to transistor variations. This dynamic control ensures consistent luminous brightness without requiring a complex circuit structure with multiple compensation components.
Data Source
AI summary
Disclosed is a pixel circuit. A pulse width signal generator provides a pulse width signal to a control terminal of a light-emitting control switch on a drive current path of a drive current generator. A multiple lighting controller adjusts the pulse width signal provided by the pulse width signal generator according to a multiple emission control signal to allow a light-emitting element to perform multi-emission.