Pixel Driving Circuit Boost Module for Higher Display Brightness
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Solution Overview
Problem
Current display panels with current-driven light-emitting elements suffer from low luminous brightness due to the limitations of data driving chip hardware, which restricts the gate-source voltage of the driving transistor, leading to insufficient current flow through the light-emitting elements.
Innovation Solution
A pixel driving circuit incorporating a boost module with capacitors to increase the gate voltage of the driving transistor from a first to a second stage, using a boost input signal to enhance the driving current and thereby improve light-emitting brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the gate-source voltage of the driving transistor is kept low during the light-emitting stage to maintain uniformity, then picture uniformity is improved, but luminous brightness deteriorates
Solution Approach 1:
The patent applies dynamics by making the gate voltage time-dependent. The gate voltage dynamically changes from a first voltage during the data writing stage to a second voltage during the light-emitting stage. This temporal variation allows the system to optimize for uniformity during writing and for brightness during emission, resolving the contradiction between these two requirements.
Solution Approach 2:
The patent changes the voltage parameter of the gate electrode between different operational stages. By switching from a first voltage to a second voltage, the system adjusts the electrical parameters to achieve different optimization goals at different times - uniformity during data writing and brightness during light emission.
2Illumination intensity
If the gate-source voltage is increased to improve luminous brightness, then luminous brightness is improved, but hardware limitations of the data driving chip are exceeded
Solution Approach 1:
The patent introduces a time dimension to the voltage control strategy. Instead of attempting to increase brightness through hardware upgrades that would exceed chip limitations, the system uses temporal sequencing - applying different voltages at different times - to achieve high brightness during light emission without requiring hardware that exceeds the data driving chip's capabilities.
3Power
If the gate voltage is increased during the light-emitting stage, then driving current increases, but the data driving chip hardware is exceeded
Solution Approach 1:
The patent uses dynamic voltage adjustment where the gate voltage is low during data writing (respecting hardware limits) and high during light emission (achieving high driving current). This temporal separation allows the system to achieve high power output without requiring hardware that can continuously sustain such high voltages.
Solution Approach 2:
The patent implements periodic action by cycling the gate voltage between different levels according to the operational stage. The voltage periodically switches from a first level during data writing to a second level during light emission, enabling high driving current only when needed while respecting hardware constraints during other phases.
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 modulates the gate voltage of the driving transistor, increasing the driving current through the light-emitting element, thus enhancing the luminance of the display panel.
Implementation Method 1
the boost module includes: a first capacitor, wherein a first plate of the first capacitor is electrically connected to an input terminal of the boost module to load the boost input signal, and wherein a second plate of the first capacitor is electrically connected to the gate electrode of the driving transistor; and a second capacitor, wherein a first plate of the second capacitor is electrically connected to the gate electrode of the driving transistor
Data Source
AI summary
A pixel driving circuit and a display panel are provided. The pixel driving circuit includes 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 electrode of the driving transistor, a boost module configured to load a boost input signal. An output terminal of the boost module is electrically connected to the gate electrode of the driving transistor to increase a voltage of the gate electrode of the driving transistor from a first voltage to the second voltage. A connection point between a first capacitor and a second capacitor is connected to the gate electrode of the driving transistor.