Pixel Driving Circuit Boost Module for Display Brightness
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Solution Overview
Problem
Existing self-emitting displays have relatively low light emitting brightness due to the limitations of the hardware of the data driving chip.
Innovation Solution
A pixel driving circuit is introduced, which includes a driving transistor connected in series with a light emitting element, a data transistor, and a boost module. The boost module boosts the gate voltage of the driving transistor from a first voltage to a second voltage, allowing for increased driving current and improved light emitting brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate-source voltage of the driving transistor is kept low to satisfy data driving chip hardware limitations and compensation requirements, then the threshold voltage compensation and image uniformity are improved, but the light emitting brightness becomes relatively low
Solution Approach 1:
The patent applies periodic action by dividing the light emitting phase into two stages: a first light emitting stage with a first gate-source voltage for normal operation, and a second light emitting stage with a second gate-source voltage (higher than the first) for brightness enhancement. This periodic switching between different voltage levels allows the system to achieve both good image uniformity during normal operation and high brightness when needed, resolving the contradiction between reliability and illumination intensity.
Solution Approach 2:
The patent implements dynamics by making the gate-source voltage adjustable rather than fixed. The driving transistor operates with different gate-source voltages at different times: a lower voltage during the first light emitting stage to maintain image quality, and a higher voltage during the second light emitting stage to boost brightness. This dynamic voltage adjustment enables the system to optimize both image uniformity and light emitting brightness at different moments.
2Illumination intensity
If the gate-source voltage of the driving transistor is increased to improve light emitting brightness, then the brightness is improved, but the threshold voltage compensation and image uniformity are affected
Solution Approach 1:
The patent uses periodic action to switch between two operating modes: during the first light emitting stage, a lower gate-source voltage is applied to maintain excellent threshold voltage compensation and image uniformity; during the second light emitting stage, a higher gate-source voltage is applied to achieve high brightness. This time-division approach ensures that high brightness is achieved without compromising the compensation and uniformity performance during normal operation.
Solution Approach 2:
The patent applies dynamics by dynamically adjusting the gate-source voltage based on operational requirements. The system transitions from a static, fixed gate-source voltage to a dynamic, time-varying voltage that is optimized for different functions at different times, thereby achieving both good image uniformity and high brightness without trade-offs.
3Reliability
If the data driving chip hardware is designed for low gate-source voltage operation, then the compensation performance is optimized, but the maximum achievable brightness is limited
Solution Approach 1:
The patent resolves this contradiction by implementing periodic action with two distinct operating phases. During the first light emitting stage, the system operates at the lower gate-source voltage optimized for compensation performance. During the second light emitting stage, the system switches to a higher gate-source voltage that enables maximum brightness. This periodic switching allows the display to achieve both excellent compensation performance and high maximum brightness, overcoming the limitation of the data driving chip hardware design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The boost module effectively increases the driving current through the light emitting element, thereby enhancing the light emitting brightness of the display panel.
Implementation Method 1
a first capacitor, wherein a first electrode plate of the first capacitor is loaded with a first signal, and a second electrode plate of the first capacitor is electrically connected to the input terminal of the boost module to be loaded with the boost input signal; and a second capacitor, wherein a first electrode plate of the second capacitor is electrically connected to the input terminal of the boost module to be loaded with the boost input signal, and a second electrode plate of the second capacitor is electrically connected to the gate of the driving transistor
Data Source
AI summary
The present disclosure provides a pixel driving circuit and a display panel, including a driving transistor connected in series with a light emitting element between a first power supply line and a second power supply line; a data transistor electrically connected to a gate of the driving transistor; a boost module configured to be loaded with a boost input signal, where an output terminal of the boost module is electrically connected to the gate of the driving transistor to enable the voltage of the gate of the driving transistor to boost from the first voltage to the second voltage, and the first capacitor and the second capacitor are connected in series between the first wiring and the gate of the driving transistor.