CN-115622625-B - Optical signal transmitting apparatus, optical signal receiving apparatus, optical communication system and method

CN115622625BCN 115622625 BCN115622625 BCN 115622625BCN-115622625-B

Abstract

An optical signal transmitting device, an optical signal receiving device, an optical communication system and a method, wherein the optical signal transmitting device comprises a control circuit and a driving back plate, the control circuit comprises a control sub-circuit, a first signal processing sub-circuit and a second signal processing sub-circuit, the driving back plate comprises a plurality of light emitting device units, the control sub-circuit is configured to generate a first driving signal, the first signal processing sub-circuit is electrically connected with the control sub-circuit and is configured to generate a second driving signal according to the first driving signal, the second signal processing sub-circuit is electrically connected with the first signal processing sub-circuit and is configured to process a signal swing of the second driving signal, generate a third driving signal and generate a light emitting driving signal according to the third driving signal, and the driving back plate is electrically connected with the second signal processing sub-circuit and is configured to emit the light signal according to the light emitting driving signal.

Inventors

YU MENGXIA
LI WEI
ZHONG XIN
QU FENG

Assignees

京东方科技集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20221110

Claims (12)

1. An optical communication system is characterized by comprising an optical signal transmitting device and an optical signal receiving device; The optical signal transmitting device comprises a control circuit and a driving backboard, wherein the control circuit comprises a control sub-circuit, a first signal processing sub-circuit and a second signal processing sub-circuit, and the driving backboard comprises a plurality of light emitting device units; The control sub-circuit is configured to generate a first drive signal, and the first drive signal is a digital signal; the first signal processing sub-circuit is electrically connected with the control sub-circuit and is configured to generate a second driving signal according to a first driving signal, and comprises an amplifying sub-circuit, wherein the second driving signal is an analog signal; the second signal processing sub-circuit comprises an attenuation sub-circuit and an alternating current-direct current coupling sub-circuit; The attenuation sub-circuit is electrically connected with the amplifying sub-circuit of the first signal processing sub-circuit and is configured to process the signal swing of the second driving signal to generate a third driving signal, wherein the third driving signal is an analog signal and is an alternating current signal; the attenuation sub-circuit comprises a first attenuation resistor, a second attenuation resistor, a third attenuation resistor, an attenuation capacitor and a second operational amplifier, wherein the first end of the attenuation capacitor is electrically connected with the amplifier sub-circuit, the second end of the attenuation capacitor is electrically connected with the first end of the first attenuation resistor, the second end of the first attenuation resistor is respectively electrically connected with the inverting input end of the second operational amplifier and the first end of the second attenuation resistor, the second end of the second attenuation resistor is electrically connected with the output end of the second operational amplifier, the first end of the third attenuation resistor is electrically connected with the non-inverting input end of the second operational amplifier, and the second end of the third attenuation resistor is electrically connected with the first power supply sub-circuit or the second power supply sub-circuit; The AC-DC coupling sub-circuit is electrically connected with the attenuator circuit and is configured to generate a light-emitting driving signal according to a third driving signal, and comprises a bias sub-circuit, wherein the bias sub-circuit comprises a bias capacitor and a bias oscillator, a first end of the bias capacitor is used as an alternating current input end and is electrically connected with the attenuator circuit, a second end of the bias capacitor is used as an output end and is electrically connected with the first end of the bias oscillator, a second end of the bias oscillator is used as a direct current input end and is electrically connected with a third power signal, and the third power signal is a direct current signal; The driving backboard is electrically connected with the second signal processing sub-circuit and is configured to emit an optical signal according to the light-emitting driving signal; the optical signal receiving device comprises a photoelectric conversion sub-circuit and a third signal processing sub-circuit; The photoelectric conversion sub-circuit is configured to receive an optical signal and convert the received optical signal into a first electrical signal, wherein the first electrical signal is an analog signal and is a differential signal; The third signal processing sub-circuit is electrically connected with the photoelectric conversion sub-circuit, is configured to convert the first electric signal into a second electric signal, and comprises a clock signal; The third signal processing sub-circuit comprises a clock reset sub-circuit which comprises a reset control chip, wherein the reset control chip comprises an active power pulse output pin and a reactive power pulse output pin, and the active power pulse output pin and the reactive power pulse output pin are electrically connected to form a frequency acquisition control loop.
2. The system of claim 1, wherein the first signal processing subcircuit further comprises a digital-to-analog conversion subcircuit; the digital-to-analog conversion sub-circuit is electrically connected with the control sub-circuit and is configured to perform digital-to-analog conversion on the first driving signal to form a first analog driving signal; the amplifying sub-circuit is electrically connected with the digital-to-analog conversion sub-circuit and is configured to amplify the first analog driving signal to generate a second driving signal; the light emission driving signal is an analog signal.
3. The system of claim 2, further comprising a first power supply sub-circuit and a second power supply sub-circuit; The first power supply sub-circuit is respectively and electrically connected with the control sub-circuit, the digital-to-analog conversion sub-circuit, the amplifying sub-circuit, the attenuation sub-circuit, the alternating current-direct current coupling sub-circuit and the driving backboard and is configured to provide a first power supply signal; The second power supply subcircuit is electrically connected with the direct current input end of the alternating current-direct current coupling subcircuit and is configured to provide a second power supply signal, and the first power supply signal and the second power supply signal are direct current signals.
4. The system of claim 3, wherein the digital-to-analog conversion sub-circuit comprises a digital-to-analog converter and the amplifying sub-circuit comprises a first operational amplifier.
5. The system of any one of claims 2 to 4, wherein the drive back plate further comprises a drive circuit configured to drive the light emitting device unit to emit light, the drive circuit comprising a first light emitting resistor, a second light emitting resistor, a third light emitting resistor, a light emitting capacitor, and a light emitting transistor; The first power supply sub-circuit is respectively and electrically connected with a first pole of the light emitting device unit and a first end of the second light emitting resistor, a second pole of the light emitting device unit is electrically connected with a first pole of the light emitting transistor, a control pole of the light emitting transistor is respectively and electrically connected with the alternating current-direct current coupling sub-circuit, the first end of the first light emitting resistor and a second end of the second light emitting resistor, a second pole of the light emitting transistor is respectively and electrically connected with a first end of the third light emitting resistor and a first end of the light emitting capacitor, and a second end of the first light emitting resistor, a second end of the third light emitting resistor and a second end of the light emitting capacitor are grounded; the light emitting transistor is an N-channel enhanced metal oxide semiconductor field effect transistor.
6. The system of claim 1, further comprising a third power supply sub-circuit electrically connected to the photoelectric conversion sub-circuit and the third signal processing sub-circuit, respectively, and configured to provide a third power supply signal.
7. The system of claim 6, wherein the photoelectric conversion sub-circuit comprises a photoelectric converter and a transimpedance amplifier; The photoelectric converter is electrically connected with the transimpedance amplifier and is configured to convert a received optical signal into an initial electrical signal, wherein the initial electrical signal is a current signal; The transimpedance amplifier is electrically connected with the third signal processing sub-circuit and is configured to convert the initial electric signal into a voltage signal and amplify the voltage signal to generate a first electric signal.
8. The system of claim 7, wherein the optical signal transmission means comprises a control sub-circuit; the third signal processing sub-circuit is also electrically connected to the control sub-circuit and is configured to transmit a second electrical signal to the control sub-circuit.
9. The system of claim 8, wherein the reset control chip further comprises a positive analog input pin, a negative analog input pin, a first digital power pin, a second digital power pin, a first analog power pin, a second analog power pin, a positive digital output pin, a negative digital output pin, a positive clock output pin, a negative clock output pin, a digital ground pin, and an analog ground pin, wherein the first digital power pin, the second digital power pin, the first analog power pin, and the second analog power pin are electrically connected to a third power sub-circuit, the positive analog input pin and the negative analog input pin are electrically connected to a transimpedance amplifier, the positive digital output pin, the negative digital output pin, the positive clock output pin, and the negative clock output pin are electrically connected to the control sub-circuit, and the digital ground pin and the analog ground pin are grounded.
10. The system of claim 9, wherein the clock reset sub-circuit further comprises an input processing sub-circuit and an output processing sub-circuit, the input processing sub-circuit comprising first to fourth resistors and first to fourth capacitors, the output processing sub-circuit comprising fifth to sixteenth resistors and fifth to eighth capacitors; The first end of the first capacitor and the first end of the second capacitor are electrically connected with the transimpedance amplifier, the second end of the first capacitor is electrically connected with the first end of the first resistor and the first end of the fourth resistor respectively, the second end of the second capacitor is electrically connected with the first end of the first resistor and the negative analog input pin respectively, the first end of the third capacitor is electrically connected with the second end of the first resistor, the first end of the second resistor, the first end of the third resistor and the second end of the fourth resistor respectively, the second end of the third capacitor and the second end of the second resistor are grounded, the first end of the fourth capacitor is electrically connected with the active power pulse output pin, the second end of the fourth capacitor is electrically connected with the reactive power pulse output pin, and the second end of the third resistor is electrically connected with the third power supply sub-circuit; The first end of the fifth capacitor, the first end of the sixth capacitor, the first end of the seventh capacitor and the first end of the eighth capacitor are electrically connected with the control sub-circuit, the second end of the fifth capacitor is electrically connected with the first end of the fifth resistor and the first end of the ninth resistor respectively, the second end of the sixth capacitor is electrically connected with the first end of the sixth resistor and the first end of the tenth resistor respectively, the second end of the seventh capacitor is electrically connected with the first end of the seventh resistor and the first end of the eleventh resistor respectively, the second end of the eighth capacitor is electrically connected with the first end of the eighth resistor and the first end of the twelfth resistor respectively, the second end of the fifth resistor is electrically connected with the first end of the thirteenth resistor and the negative digital output pin respectively, the second end of the seventh resistor is electrically connected with the first end of the fifteenth resistor and the first end of the negative clock output pin respectively, the second end of the eighth resistor is electrically connected with the first end of the sixteenth resistor and the first end of the clock output pin respectively, the second end of the thirteenth resistor, the thirteenth resistor and the thirteenth end of the thirteenth resistor and the sixteenth resistor are connected with the sixteenth resistor and the sixteenth resistor.
11. The system of claim 1, further comprising signal processing means; the signal processing device is electrically connected with the optical signal transmitting device and is configured to filter the signal received by the optical signal transmitting device.
12. An optical communication method, characterized in that it is applied to an optical communication system according to any one of claims 1 to 11, wherein the process of emitting an optical signal includes: generating a first drive signal; Generating a second drive signal from the first drive signal; Processing the signal swing of the second driving signal to generate a third driving signal, and generating a light-emitting driving signal according to the third driving signal; Emitting an optical signal according to the light-emitting driving signal; The process of receiving an optical signal includes: receiving an optical signal, and converting the received optical signal into a first electrical signal, wherein the first electrical signal is an analog signal and is a differential signal; The first electrical signal is converted to a second electrical signal, which is a digital signal and includes a clock signal.

Description

Optical signal transmitting apparatus, optical signal receiving apparatus, optical communication system and method Technical Field The present disclosure relates to the field of optical communications technologies, but is not limited to, and in particular, to an optical signal transmitting apparatus, an optical signal receiving apparatus, an optical communication system, and an optical communication method. Background The visible light communication technology is an emerging wireless optical communication technology, which uses high-speed bright-dark flickering signals which are not visible to the naked eye and are emitted by luminous components such as fluorescent lamps or light-emitting diodes to transmit information, and receives optical signals through photoelectric elements and converts the optical signals into electric signals to realize signal receiving and conversion. The visible light communication technology has the characteristics of wide range, practicability, confidentiality, high speed, wide frequency spectrum and the like, can fill up the blind area of the current wireless communication, can realize communication only in a light place, and can be applied to various fields. The current scheme of combining the display panel and the optical communication, although capable of realizing the optical communication, affects the service life of the backlight. Disclosure of Invention The following is a summary of the subject matter of the detailed description of the application. This summary is not intended to limit the scope of the claims. In a first aspect, the present disclosure provides an optical signal transmitting apparatus, including a control circuit including a control sub-circuit, a first signal processing sub-circuit, and a second signal processing sub-circuit, and a driving back plate including a plurality of light emitting device units; The control sub-circuit is configured to generate a first drive signal; The first signal processing sub-circuit is electrically connected with the control sub-circuit and is configured to generate a second driving signal according to the first driving signal; The second signal processing sub-circuit is electrically connected with the first signal processing sub-circuit and is configured to process the signal swing of the second driving signal, generate a third driving signal and generate a light-emitting driving signal according to the third driving signal; the driving backboard is electrically connected with the second signal processing sub-circuit and is configured to emit an optical signal according to the light-emitting driving signal. In an exemplary embodiment, the first signal processing sub-circuit comprises a digital-to-analog conversion sub-circuit and an amplifying sub-circuit, and the second signal processing sub-circuit comprises an attenuation sub-circuit and an alternating current-direct current coupling sub-circuit; The digital-to-analog conversion sub-circuit is electrically connected with the control sub-circuit and is configured to perform digital-to-analog conversion on the first driving signal to form a first analog driving signal, and the first driving signal is a digital signal; The amplifying sub-circuit is electrically connected with the digital-to-analog conversion sub-circuit and is configured to amplify the first analog driving signal to generate a second driving signal, and the second driving signal is an analog signal; The attenuation sub-circuit is electrically connected with the amplifying sub-circuit and is configured to process the signal swing of the second driving signal to generate a third driving signal, wherein the third driving signal is an analog signal and is an alternating current signal; An ac/dc coupling sub-circuit electrically connected to the attenuator circuit and configured to generate a light emission driving signal according to a third driving signal, where the light emission driving signal is an analog signal; the AC/DC coupling sub-circuit comprises an AC input end and a DC input end, and the attenuator circuit is electrically connected with the AC input end of the AC/DC coupling circuit. In an exemplary embodiment, the power supply further comprises a first power supply sub-circuit and a second power supply sub-circuit; The first power supply sub-circuit is respectively and electrically connected with the control sub-circuit, the digital-to-analog conversion sub-circuit, the amplifying sub-circuit, the attenuation sub-circuit, the alternating current-direct current coupling sub-circuit and the driving backboard and is configured to provide a first power supply signal; The second power supply sub-circuit is electrically connected with the direct current input end of the alternating current-direct current coupling sub-circuit respectively and is configured to provide a second power supply signal, and the first power supply signal and the second power supply signal are direct current signals. In an exempl