Pixel Driving Circuit Low-Grayscale Brightness Control
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Solution Overview
Problem
Existing display technologies, such as Micro-LED, Mini-LED, and OLED, face challenges in achieving accurate low-grayscale brightness values due to limited data voltage step size, which restricts their ability to fully realize display functions at low grayscales.
Innovation Solution
A pixel driving circuit comprising a driving module and a grayscale adjustment module, which generate and adjust driving currents based on gate voltage and power source voltages to enable accurate low-grayscale display by utilizing transistors with varying width-to-length ratios and energy storage modules to maintain potential control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a minimum data step is used to control driving current, then the IC can be simplified, but the low-grayscale brightness values cannot be accurately achieved
Solution Approach 1:
The patent segments the grayscale display into two distinct modes: first grayscale mode for low brightness values and second grayscale mode for high brightness values. Each mode uses different driving current control mechanisms, allowing the system to achieve fine granularity at low grayscales without requiring complex IC architecture for all operating conditions.
Solution Approach 2:
The patent dynamically switches between first and second driving currents based on the required grayscale level. The switching mechanism allows the system to adaptively select the appropriate driving current mode, enabling accurate low-grayscale display when needed while using simpler control for high-grayscale display.
2Reliability
If a high current density is used to ensure luminous efficiency, then the light-emitting element performance is improved, but the data voltage step size becomes insufficient for low grayscales
Solution Approach 1:
The patent changes the driving current parameter based on the grayscale level. For low grayscales, it uses a first driving current with smaller current density steps to achieve fine brightness control. For high grayscales, it switches to a second driving current with larger current density steps, maintaining both luminous efficiency and display precision across all grayscale ranges.
Data Source
AI summary
The present disclosure provides a pixel driving circuit and a display panel. The pixel driving circuit includes a driving module and a grayscale adjustment module. The driving module is configured to generate a first driving current corresponding to a first grayscale range under the control of a potential at a gate voltage end and a first power source voltage, and transmit the first driving current to a light-emitting element. The grayscale adjustment module is configured to adjust the driving module under the control of the first power source voltage and a first data voltage, so that the driving module generates a second driving current corresponding to a second grayscale range under the control of the potential at the gate voltage end and the first power source voltage, and transmits the second driving current to the light-emitting element.