Application Cases

Experiment Name: One-to-Many Driving in Carrier-Free Mode

Experiment Content: In this work, a method is proposed to control the driving frequency range of devices through a carrier-free injection device structure, using different frequency signals to select and drive different structural devices. The device structure, photoelectric properties, and frequency characteristics were analyzed and studied. The carrier-free operation mode is used to optimize the display driving panel to reduce the required driving row and column lines, addressing the challenge of the increasing number of driving lines needed for high-resolution displays.

Research Direction: Carrier-Free Injecting Light-Emitting Devices

Testing Equipment: ATA-122D power amplifier, signal generator, oscilloscope, light flux meter, photodetector, etc.

Figure 1: Schematic diagram of the experimental setup

Experiment Process: The theoretical model of the device and the driving circuit model were constructed. A sine signal was generated by the signal generator, amplified by the ATA-122D amplifier, and then connected to the driving circuit. The input voltage was detected using an oscilloscope, and the brightness of the device was measured using a light flux meter and a colorimeter. Measurements were taken at different driving frequencies to determine the optimal operating frequencies for different structural LEDs, ultimately achieving the driving of multiple LEDs with a single signal line.

Experiment Results:

Figure 2: Experimental Results

Carrier-free LEDs exhibited good frequency-selective characteristics. Red, green, and blue LEDs achieved maximum brightness at different center frequencies, verifying that different LEDs can be controlled by adjusting the driving frequency. By measuring the phase difference between the brightness peak and the input voltage peak, differences in phase were found at different frequencies. A zero phase difference can be achieved by changing the driving conditions, making the LED brightness response consistent with the input signal. Finally, a control scheme for three LEDs with a single data line was realized through frequency characteristics, effectively reducing the number of row and column electrodes required for the display panel and providing a more simplified circuit design for high-resolution displays.

Power Amplifier Recommendation: ATA-1372A Broadband Amplifier

Figure: Specifications of the ATA-1372A Broadband Amplifier