Grayscale Adjustment Circuit for Micro LED Luminous Efficiency
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Solution Overview
Problem
Micro Light Emitting Diode (Micro LED) displays face low luminous efficiency and limited adjustable grayscales due to low current density, especially when modulating low grayscales, which restricts display brightness and resolution.
Innovation Solution
A grayscale adjustment circuit comprising an input sub-circuit, driving sub-circuit, switching time control sub-circuit, switching control sub-circuit, and light-emitting sub-circuit, which controls the voltage/current between the light-emitting chip's terminals and light-emitting time to modulate grayscale, allowing for adjustable parameters like the number of light-emitting chips and light-emitting time to enhance luminous efficiency and grayscale modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If low current density is used in Micro LED, then power consumption is reduced, but luminous efficiency deteriorates
Solution Approach 1:
The patent applies periodic action by using pulse width modulation (PWM) to control the Micro LED. The circuit switches the LED on and off at high frequency, varying the duty cycle to control perceived brightness. This allows the LED to operate at high current density during on-periods (maintaining high luminous efficiency) while achieving low average power consumption through reduced on-time proportion.
Solution Approach 2:
The patent implements dynamics by introducing a grayscale adjustment circuit that dynamically controls the current density to the Micro LED. The circuit includes switching elements and capacitors that can rapidly adjust the current level, enabling the system to adapt between high current density (for high brightness and efficiency) and low current density (for low power consumption) based on display requirements.
2Use of energy by stationary object
If low current density is used to modulate low grayscale, then power consumption is reduced, but the number of adjustable grayscales is limited
Solution Approach 1:
The patent applies segmentation by dividing the grayscale control into multiple independent control paths. The grayscale adjustment circuit includes multiple switching elements (first switching element, second switching element) and capacitors that can be independently controlled. This segmentation allows for fine-grained adjustment of current density, enabling precise control over a large number of grayscale levels while maintaining low power consumption.
Solution Approach 2:
The patent introduces another dimension to grayscale control by adding temporal control through PWM in addition to current density control. The circuit can adjust both the magnitude of current (amplitude modulation) and the duration of current flow (pulse width modulation), creating a two-dimensional control space that dramatically increases the number of可调 grayscale levels beyond what current density alone could achieve.
3Illumination intensity
If current density is increased to improve luminous efficiency, then brightness is improved, but power consumption increases
Solution Approach 1:
The patent uses periodic action through PWM control to achieve high brightness perception without continuous high power consumption. The Micro LED is driven at high current density during brief on-periods to produce maximum brightness, then turned off during off-periods. The human eye's persistence of vision integrates these pulses into a perceived steady brightness, while the average power consumption remains low due to the duty cycle being less than 100%.
4Device complexity
If simple current control is used, then device complexity is reduced, but grayscale modulation precision deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the control circuit into modular functional blocks: input sub-circuit with switching elements, driving sub-circuit with capacitors for charge storage, and output sub-circuit connected to the Micro LED. Each module performs a specific function (switching, charge storage, current regulation), allowing for precise grayscale control through coordinated operation of simple, well-defined components rather than a single complex control mechanism.
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 circuit stabilizes current density and increases the ratio of maximum to minimum brightness, enabling a higher number of adjustable grayscales and improved luminous efficiency, particularly by adjusting the number of light-emitting chips and light-emitting time, thus overcoming the limitations of low grayscale modulation in Micro LED displays.
Implementation Method 1
a first capacitor, a gate electrode of each of the at least one second transistor is coupled to the second electrode of the first transistor, and a first electrode of each second transistor is coupled to the first voltage terminal
Data Source
AI summary
A grayscale adjustment circuit, a driving method thereof and a display device are provided. The circuit includes: an input sub-circuit configured to output a signal of a data signal terminal to a driving sub-circuit under a control of the scanning signal terminal, the driving sub-circuit configured to store an output signal of the input sub-circuit and output a signal of the first voltage terminal to a switching control sub-circuit under a control of the output signal of the input sub-circuit, a switching time control sub-circuit configured to output a signal of each switching time signal terminal to the switching control sub-circuit under a control of each switching time control terminal, the switching control sub-circuit configured to output an output signal of the driving sub-circuit to the light-emitting sub-circuit under a control of an output signal of the switching time control sub-circuit to control the light-emitting sub-circuit to emit light.