Display Panel Pre-Charging Module for Brightness Transition
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Solution Overview
Problem
Current display panels face challenges in achieving high brightness and reducing the time required for light emitting elements to start emitting light, especially when switching from low to high brightness, due to the initial low potential of the anode in light emitting elements.
Innovation Solution
The display panel incorporates a pixel circuit with a pre-charging module that increases the voltage of a first node to a first voltage in the non-light emitting stage, which is less than the light emitting threshold voltage, thereby reducing the charging time required for the light emitting element to reach the threshold voltage and start emitting light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the anode potential of the light emitting element is reset in the non-light emitting stage, then the light emitting element can be prepared for the light emitting stage, but the light emitting element needs to be charged for a period of time in the light emitting stage, resulting in low overall brightness during transition from low to high brightness
Solution Approach 1:
The patent applies preliminary action by introducing a pre-charging module that performs partial charging of the light emitting element's anode before the light emitting stage begins. The pre-charging module increases the voltage of the first node to a first voltage (less than the light emitting threshold voltage) during the non-light emitting stage, so that when the light emitting stage starts, the anode already has some charge, reducing the charging time required to reach the threshold voltage and improving the overall brightness during transition.
2Speed
If the light emitting element is charged from low potential in the light emitting stage, then the light emitting element can start emitting light, but the charging process takes time, causing delay in light emission
Solution Approach 1:
The pre-charging module performs preliminary charging action during the non-light emitting stage by increasing the voltage of the first node to a first voltage that is closer to the light emitting threshold voltage. This preliminary action reduces the voltage gap that needs to be bridged during the light emitting stage, thereby reducing the charging time and increasing the speed of light emission.
Solution Approach 2:
The charging process is segmented into two stages: a pre-charging stage during the non-light emitting stage where the voltage is increased to a first voltage (less than the threshold voltage), and a main charging stage during the light emitting stage where the voltage is increased from the first voltage to the light emitting threshold voltage. This segmentation allows the charging process to be divided into a preparation phase and an execution phase, optimizing the timing and speed of light emission.
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 pre-charging module significantly shortens the charging time for the light emitting element, allowing it to start emitting light earlier and improving the overall brightness of the display panel, especially during the transition from low to high brightness.
Implementation Method 1
The pre-charging module being configured to increase a voltage of a first node to a first voltage in a non-light emitting stage, the first node being electrically connected to the light emitting control module and the light emitting element
Data Source
AI summary
The present application provides a display panel and a display apparatus. The display panel includes a plurality of pixel units arranged in an array, each of the pixel units includes a pixel circuit and a light emitting element; the pixel circuit includes a data writing module, a driving module, a light emitting control module and a pre-charging module; the data writing module is configured to provide a data signal to the driving module; the driving module is configured to provide a driving current to the light emitting element; the light emitting control module is configured to selectively allow the light emitting element to enter a light emitting stage; and the pre-charging module is configured to increase a voltage of a first node to a first voltage in a non-light emitting stage, in which the first voltage is less than a light emitting threshold voltage of the light emitting element.