Display Device Duty Cycle Optimization for Luminous Efficiency
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Solution Overview
Problem
Conventional display devices using pulse amplitude modulation (PAM) control for driving display panels face challenges in achieving optimal luminous efficiency, requiring improved methods to enhance light-emitting performance.
Innovation Solution
A display device and driving method that involve a controller receiving characteristic information of light-emitting elements to derive relationship curves between current density, luminous efficiency, and duty cycle, allowing the selection of an optimal duty cycle for maximum luminous efficiency, which is then used by the driver to regulate the light-emitting time of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PAM control is used to drive the display panel, then circuit design and driving method are simple, but luminous efficiency is lower
Solution Approach 1:
The patent changes the control parameter from simple amplitude modulation to a combined approach where duty cycle is optimized based on the relationship between duty cycle and accumulated power consumption. By adjusting the duty cycle parameter according to the derived relationship curve, the system achieves maximum luminous efficiency while maintaining PAM control's simplicity.
2Loss of energy
If PWM control is used to drive the display panel, then luminous efficiency is improved, but circuit design and driving method become complex
Solution Approach 1:
The patent introduces an intermediary approach by deriving a relationship curve between duty cycle and accumulated power consumption based on light-emitting element characteristics. This curve serves as a mediator that guides duty cycle selection to achieve optimal luminous efficiency without requiring the complex PWM circuitry, thus bridging the gap between simple PAM control and efficient PWM control.
3Loss of energy
If duty cycle is increased to improve luminous efficiency, then accumulated power consumption increases
Solution Approach 1:
The patent applies dynamics by making the duty cycle adjustable and optimized based on the derived relationship curve rather than using a fixed duty cycle. The controller dynamically selects the optimal duty cycle from the relationship curve between duty cycle and accumulated power consumption, achieving maximum luminous efficiency while managing power consumption effectively.
Data Source
AI summary
A display device and a driving method thereof are provided. The display device includes a display panel, a controller, and a driver. The display panel includes a plurality of light-emitting elements. The controller receives characteristic information of the light-emitting elements, and obtains a first relationship curve between current density information and luminous efficiency information according to the characteristic information. The controller obtains a second relationship curve between duty cycle information and accumulated current consumption information or accumulated power consumption information according to the first relationship curve. The controller finds a selected duty cycle corresponding to a maximum luminous efficiency according to the second relationship curve. The driver activates the light-emitting elements according to the selected duty cycle.