Pixel Driving Circuit Threshold Compensation and Sensor Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pixel driving devices face issues with brightness differences and increased power consumption due to varying threshold voltages of driving transistors and the need for complex circuitry when incorporating optical sensors.
Innovation Solution
A pixel driving device incorporating a driving transistor, pixel driving circuit, optical sensor circuit, and reset and reading circuit, which receives sweep signals and driving signals to reset and compensate nodes, control the driving transistor, and perform sensing processes, thereby reducing voltage differences and simplifying circuit implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional pixel driving devices use driving transistors with different threshold voltages, then the devices can drive light emitting devices, but brightness differences and uneven display images occur
Solution Approach 1:
The patent applies preliminary action by performing threshold voltage compensation before the light emitting device operates. The pixel driving circuit stores compensation data that compensates for threshold voltage differences of driving transistors in advance, so that when the transistor drives the light emitting device, the brightness uniformity is already corrected, preventing display unevenness before it occurs.
2Illumination intensity
If a large driving current is used to make micro light emitting devices emit light, then the light emission is sufficient, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by adjusting the voltage parameters in the pixel driving circuit to optimize the driving current. By changing the voltage levels and compensation parameters, the circuit achieves sufficient light emission while reducing the overall power consumption of the pixel driving device.
3Adaptability or versatility
If an optical sensor is added to a pixel driving device, then sensing functionality is achieved, but the device becomes too complicated and difficult to implement
Solution Approach 1:
The patent applies merging by integrating the optical sensor circuit directly into the pixel driving circuit structure. The sensor circuit shares common components and signal lines with the driving circuit, such as using the same node connections and control signals, which reduces the overall circuit complexity while achieving both driving and sensing functions in a unified structure.
Solution Approach 2:
The patent applies universality by designing the pixel driving circuit to perform multiple functions. The same circuit nodes and components are used for both driving the light emitting device and sensing optical signals, making the circuit multi-functional and reducing the need for separate dedicated sensing circuits.
4Power
If a voltage difference is too large between two power supply voltages, then driving current can be generated, but brightness differences and increased power consumption occur
Solution Approach 1:
The patent applies parameter changes by optimizing the voltage parameters and compensation values in the pixel driving circuit. By adjusting these parameters, the circuit generates sufficient driving current while minimizing energy loss and power consumption.
Data Source
AI summary
A pixel driving device includes a driving transistor, a pixel driving circuit, an optical sensor circuit, and a reset and reading circuit. Driving transistor controls a light emission device. Pixel driving circuit is connected to the driving transistor and resets according to a first sweep signal. Pixel driving circuit compensates according to a second sweep signal. Pixel driving circuit controls the driving transistor according to a driving signal to drive light emission device. Optical sensor circuit includes a node. Optical sensor circuit resets the node to a voltage level of the driving signal. Light sensing circuit performs sensing to generate a light sensing signal. Reset and reading circuit is connected to the driving transistor, the pixel driving circuit, and the optical sensor circuit. Reset and reading circuit receives a reset and reading signal so as to reset the pixel driving circuit and to read out the light sensing signal.