Pixel Driving Circuit Boost Module for Display Brightness
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Solution Overview
Problem
Current current-driven displays have low light emitting brightness due to hardware limitations of the data driving chip, which restricts the gate-source voltage of the driving transistor, resulting in a small driving current and low brightness.
Innovation Solution
A pixel driving circuit is introduced, featuring a driving transistor connected in series with a light emitting element, a data transistor, and a boost module that modulates the gate voltage of the driving transistor from a first voltage to a second voltage, increasing the driving current through the light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the gate-source voltage of the driving transistor is increased to improve light emitting brightness, then the driving current increases and brightness improves, but the hardware limitations of the data driving chip prevent achieving sufficiently high gate-source voltage
Solution Approach 1:
The patent introduces a bootstrap transistor as an intermediary component between the data driving chip and the driving transistor. This bootstrap transistor acts as a voltage amplifier that takes the limited voltage output from the data driving chip and boosts it to a higher voltage level suitable for driving the light emitting element at high brightness. The bootstrap transistor thus mediates the conflict between the hardware limitations of the data driving chip and the requirement for high gate-source voltage to achieve high brightness.
2Illumination intensity
If the data driving chip is designed with higher voltage output capability to improve brightness, then light emitting brightness increases, but the chip complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the voltage boosting function into a separate bootstrap transistor component rather than integrating it into the data driving chip itself. This segmentation allows the data driving chip to remain simple and easy to manufacture with standard voltage output capabilities, while the voltage amplification function is handled by the additional bootstrap transistor. The segmentation thus resolves the contradiction by separating the complex voltage boosting function from the manufacturing process of the data driving chip.
3Ease of manufacture
If the gate-source voltage is kept low to simplify the data driving chip design, then chip manufacturing is easier, but the driving current becomes small and brightness is reduced
Solution Approach 1:
The bootstrap transistor serves as an intermediary voltage amplifier that allows the data driving chip to operate with simple, low-voltage output design while still achieving high gate-source voltage at the driving transistor. The bootstrap transistor takes the simple low-voltage signal from the data driving chip and transforms it into a high-voltage signal, thus resolving the contradiction between ease of chip manufacturing and light emitting brightness.
Data Source
AI summary
The present disclosure provides a pixel driving circuit and a display panel, including a data transistor connected to a data line, a driving transistor connected in series with a light emitting element between a first power supply line and a second power supply line, and a boost module of which an input terminal is loaded with a boost input signal. A source and a gate of the driving transistor are respectively electrically connected to the light emitting element and the data transistor, and 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 a first voltage to a second voltage.