Pixel Circuit Gray Scale Control via Time-Varying Storage Voltage
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Solution Overview
Problem
Micro LED display technology faces challenges in achieving commercialization due to issues like color coordinate deviation at different currents, which complicates the control of gray scales and requires additional elements, making it difficult to achieve efficient and cost-effective display solutions.
Innovation Solution
A pixel circuit with a light-emitting driving circuit, storage circuit, and data writing circuit that generates a control voltage changing with time to control the turn-on time of the light-emitting driving circuit, allowing for gray scale control under fixed voltage without additional elements, using transistors and capacitors to manage the light-emitting time of Micro LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional elements are added to control gray scales in Micro LED displays, then gray scale control precision is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the control signal time-dependent. A triangular wave signal is used as the control signal, which dynamically changes over time during the light-emitting phase. This dynamic control allows the pixel circuit to control gray scales through the duration of transistor conduction rather than requiring additional static control elements, thereby achieving precise gray scale control without increasing device complexity
Solution Approach 2:
The patent changes the parameter of control from static voltage levels to dynamic time-dependent signals. By using a triangular wave control signal that varies with time, the system controls gray scales through the integration effect over time rather than through multiple discrete voltage levels, reducing the need for additional control elements while maintaining precision
2Use of energy by moving object
If Micro LED display technology is applied to smart phones and wearable devices, then power consumption is reduced and brightness is improved, but control of gray scales becomes more difficult
Solution Approach 1:
The patent applies self-service through the integration effect where the capacitor automatically integrates the current over time based on the triangular wave control signal. This self-integration mechanism eliminates the need for complex external control circuits, allowing the system to easily control gray scales while maintaining low power consumption and high brightness characteristics of Micro LED
Solution Approach 2:
The patent uses periodic triangular wave signals to control the light-emitting phase. This periodic action allows for simple and easy control of gray scales by adjusting the duty cycle or frequency of the periodic signal, while maintaining the energy efficiency and brightness of Micro LED displays in portable devices
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
This solution enables the control of gray scales and reduces color coordinate deviations in Micro LED displays by managing the light-emitting time of Micro LEDs, achieving a simple and cost-effective display driving scheme that enhances display brightness and efficiency.
Implementation Method 1
the storage circuit comprises a capacitor
Data Source
AI summary
A pixel circuit and a driving method thereof, a display panel, and a display device are provided. The pixel circuit includes a light-emitting driving circuit, a storage circuit, and a data writing circuit, a first terminal of the storage circuit is respectively electrically connected to the data writing circuit and the light-emitting driving circuit, a second terminal of the storage circuit is configured to receive a control signal, and the storage circuit is configured to receive and store the first data voltage, to generate a first control voltage, that changes with time, according to the control signal and the first data voltage, and to cause the first control voltage to be applied to the light-emitting driving circuit to control a turn-on time of the light-emitting driving circuit; and the light-emitting driving circuit is configured to drive the light-emitting element to emit light under control of the first control voltage.