KR101939990B1 - Low power LVDS video transmission device, system and method - Google Patents

Abstract

Provided are a device, a system, and a method for transmitting a low power low voltage differential signaling (LVDS) image which can reduce the power consumption compared to that of the existing LVDS technology. According to an embodiment of the present invention, the device for transmitting a low power LVDS image comprises: a receiving unit receiving image data from the outside to control a flow of the image data by using a preset value; and a transmitting unit receiving the image data in which the flow is controlled in the receiving unit to transmit the image data to the outside, and set to a transmitting mode or a power saving mode according to whether the image data are transmitted by the receiving unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a low power LVDS video transmission device,

The present invention relates to an LVDS image transmission apparatus, system and method, and more particularly, to a low power LVDS image transmission apparatus, system, and method that can reduce power consumption in an image transmission process using LVDS of a small system including a thermal camera.

Low Voltage Differential Signaling (LVDS) technology is an electrical signal system that can operate at a high speed on cheap twisted-pair copper cables, and has become widely used in computers and has become a form of high-speed network and computer bus. This LVDS is especially effective for the transmission of high-capacity raw video, which is used in cameras, as well as a long distance to support it. It also has the advantage of high power efficiency (approx. 400mW) compared to high capacity data transmission of up to 2Gb / s Has come.

This LVDS technology has been continuously used because of its low development period and low power consumption ratio compared to other data transmission methods. However, due to technological advancement, a serial transmission system specialized for small systems such as MIPI has been developed and the power consumption rate is higher than that of MIPI Problems are beginning to emerge.

KR 1172389 B

In order to solve the problems of the related art as described above, an embodiment of the present invention is to provide a low power LVDS image transmission apparatus, system and method with reduced power consumption compared to the conventional LVDS technology.

According to an aspect of the present invention, there is provided a low power LVDS image transmission apparatus. The low power LVDS image transmission apparatus includes: a receiving unit that receives image data from the outside and controls the flow of the image data using a predetermined value; And a transmission unit that receives the image data whose flow is controlled by the reception unit and transmits the image data to the outside, wherein the transmission unit is set to a transmission mode or a power saving mode depending on whether the image data is transmitted from the reception unit.

Wherein the receiver comprises: a transmission buffer for determining a mode of the transmitter; A control module for controlling a flow of the image data transmitted from the outside and controlling a mode of the transmission buffer; And a memory module for storing the image data for a predetermined time according to the control of the control module and transmitting the stored image data to the transmitter, wherein the transmission buffer is set to an on mode or an off mode, Is a low-Z state in which the transmission buffer has a low impedance, and the off mode may be in a Hi-Z state in which the transmission buffer has a high impedance.

The control module controls the transmission of the frame stored in the memory module every time one frame of the image data is stored to the transmission unit and changes the mode of the transmission buffer from the off mode to the on mode .

The transmission unit receives the frame from the memory module, generates a conversion signal including LVDS electrical characteristics, and transmits the conversion signal to the outside. The transmission unit is set to the transmission mode when the transmission buffer is in the ON mode, And may be set to the power saving mode when the buffer is in the off mode.

According to an aspect of the present invention, a low power LVDS image transmission system is provided. The low-power LVDS image transmission system includes a thermal imaging camera for photographing an image using infrared rays; A receiving unit which receives the image data photographed using the thermal image camera and controls the flow of the image data by using a predetermined value; And a transmission unit that receives the image data whose flow is controlled by the reception unit and transmits the image data to the outside, wherein the transmission unit is set to a transmission mode or a power saving mode depending on whether the image data is transmitted from the reception unit.

Wherein the receiver comprises: a transmission buffer for determining a mode of the transmitter; A control module for controlling a flow of the image data transmitted from the thermal image camera and controlling a mode of the transmission buffer; And a memory module for storing the image data for a predetermined time according to a control of the control module and transmitting the stored image data to the transmitter, wherein the transmission buffer is set to an on mode or an off mode, Is a low-Z state in which the transmission buffer has a low impedance, and the off mode may be in a Hi-Z state in which the transmission buffer has a high impedance.

The control module controls the transmission of the frame stored in the memory module every time one frame of the image data is stored to the transmission unit and changes the mode of the transmission buffer from the off mode to the on mode .

The transmission unit receives the frame from the memory module, generates a conversion signal including LVDS electrical characteristics, and transmits the conversion signal to the outside. The transmission unit is set to the transmission mode when the transmission buffer is in the ON mode, And may be set to the power saving mode when the buffer is in the off mode.

According to an aspect of the present invention, a low power LVDS image transmission method is provided. The low power LVDS image transmission method is a low power LVDS image transmission method for transmitting image data using a low power LVDS image transmission apparatus or system, Receiving the image data from the outside by the receiving unit; Controlling the flow of the image data using the predetermined value and transmitting the control signal to the transmitter; And transmitting the image data to the outside through the transmission unit. The transmission unit is set to a transmission mode when the stored image data is received, and is set to a power saving mode when the stored image data is not received do.

Wherein the step of transmitting the image data to the transmission unit includes the steps of: the receiver unit storing the image data frame by frame; And controlling the mode of the transmission buffer and transmitting the stored frame to the transmission unit, wherein the mode of the transmission buffer is set to an on mode or an off mode, Is a low-Z state having a low impedance, and the off mode may be a Hi-Z state in which the transmission buffer has a high impedance.

The controlling of the mode of the transmission buffer by the receiving unit may be set to change the mode of the transmission buffer from the off mode to the on mode when the stored frame is transmitted to the transmitting unit.

Wherein the transmitting unit receives the stored frame from the receiving unit to generate a converted signal including the LVDS electrical characteristic and transmits the converted signal to the outside, Mode is set to the transmission mode, and when the transmission buffer is in the off mode, the power saving mode can be set.

The low power LVDS image transmission apparatus, system and method according to an embodiment of the present invention can reduce the power consumption compared to the conventional LVDS technology.

In addition, the low-power LVDS image transmission apparatus and system according to an embodiment of the present invention has an effect that it can be easily manufactured by adding a configuration to a circuit of an existing LVDS apparatus and a system.

In addition, the thermal camera of the low power LVDS image transmission system according to the embodiment of the present invention can save about 13% of the total power of the camera module and about 21% of the power consumption of the digital board.

1 is a block diagram briefly showing a low-power LVDS image transmission apparatus according to an embodiment of the present invention.
2 is a block diagram briefly illustrating a low power LVDS image transmission system in which a thermal camera is coupled to a low power LVDS image transmission apparatus according to an embodiment of the present invention.
3 is a flowchart briefly showing a method of transmitting a low power LVDS image according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a block diagram briefly showing a low-power LVDS image transmission apparatus according to an embodiment of the present invention. 1, a low power LVDS image transmission apparatus 100 according to an exemplary embodiment of the present invention includes a receiving unit 110 for receiving image data from the outside and a transmitting unit 130 for transmitting image data to the outside do.

The receiving unit 110 receives the image data from the outside and controls the flow of the image data using a predetermined set value. For this, the receiving unit 110 may include a control module 111, a memory module 113, and a transmission buffer 115.

The control module 111 is provided to control a flow of image data received from the outside and a mode of a transmission buffer to be described later. When the control module 111 receives the image data, the control module 111 controls the flow of the image data using the predetermined process value and transmits the controlled image data to the transmission unit 130. At this time, May be controlled on a frame-by-frame basis.

For example, when the receiving unit 110 receives image data from the outside, the control module 111 stores the received image data in the memory module 113, which will be described later, for a predetermined time, When the storage of the frame is completed, the frame is transmitted to the transmitter 130 so that the flow of the image data can be controlled.

The memory module 113 stores image data under the control of the control module 111. [ The memory module 113 stores the video data received from the outside for a predetermined time according to the preset value stored in the control module 111 and transmits the stored video data to the transmitting unit 130 under the control of the control module 111 .

The transmission buffer 115 determines a mode of the transmission unit 130. [ The transmission buffer 115 may be set to the on mode or the off mode through the control of the control module 111, thereby determining the mode of the transmission unit 130.

The mode setting of the transmission buffer 115 may be changed using an impedance constituting the transmission buffer 115. [ The ON mode of the transmission buffer 115 can be formed such that the transmission buffer 115 has a low impedance (Low-Z) to supply power to the transmission buffer 115, and the OFF mode of the transmission buffer 115 , The power supplied to the transmission buffer 115 can be reduced by having the transmission buffer 115 having a high impedance (Hi-Z).

The transmission unit 130 receives image data from the reception unit 110 and transmits the image data to the outside. At this time, the transmission unit 130 may be set to a transmission mode or a power saving mode according to the setting of the transmission buffer 115 of the reception unit 110. For example, when the transmission buffer 115 is set to the ON mode, the transmission unit 130 may set the transmission mode to transmit the image data to the outside. When the transmission buffer 115 is set to the OFF mode, It is possible to reduce the power consumption by stopping the operation because the power is not supplied. At this time, the transmitter 130 may further generate a conversion signal for transmitting the image data to the outside, and the conversion signal is formed so as to include the LVDS electrical characteristic in the image data received by the transmitter 130. [

In this case, the receiving unit 110 may be configured with a parallel stream data interface driven by a clock of 85 MHz or less, and the parallel stream data may be a maximum of 24 bits.

In addition, the transmitter 130 may be configured with a stream data interface driven by a fixed clock of 85 MHz, and the parallel stream data may be fixed to 4 bits. Accordingly, the low power LVDS image transmission apparatus 100 according to the embodiment of the present invention can buffer the difference between the clock and the driving speed between the receiving unit 110 and the transmitting unit 130 by having the transmission buffer 115 therein .

Meanwhile, FIG. 2 illustrates a low power LVDS image transmission system according to an embodiment of the present invention. 2, a low power LVDS image transmission system 200 according to an embodiment of the present invention includes a photographing unit 210 in a receiving unit 110 of the low power LVDS image transmitting apparatus 100 of FIG. And a description of the low power LVDS image transmission apparatus 100 will be omitted for the sake of explanation.

The photographing unit 210 photographs an image and transmits the image data including the photographed image information to the receiving unit 110. [ In this case, the photographing unit 210 may be an infrared camera that generates infrared rays or images an image using moonlight, or may be a thermal camera that photographs far-infrared rays generated from heat included in an object.

FIG. 3 illustrates a low power LVDS image transmission method using the low power LVDS image transmission apparatus and system according to an embodiment of the present invention shown in FIGS. 1 and 2. Referring to FIG. 3 is a flowchart briefly showing a method of transmitting a low power LVDS image according to an embodiment of the present invention.

Referring to FIG. 3, the low power LVDS image transmission method 300 according to an exemplary embodiment of the present invention includes receiving image data (S310), controlling the flow of image data, and transmitting the image data to a transmitter (S320) And transmitting the received image data to the outside (S330). Hereinafter, the image transmission method of the present invention will be described using the low power LVDS image transmission apparatus and system of FIG. 1 and FIG.

First, the receiving unit receives image data (step S310). The receiving unit receives image data from an external or thermal image camera.

Next, the reception unit controls the flow of the input image data and transmits the image data to the transmission unit (step S320). In this case, step S320 may include storing the image data on a frame basis (S321), controlling the mode of the transmission buffer, and transmitting the stored frame to the transmission unit (S323).

The receiving unit stores the received video data on a frame-by-frame basis (step S321). At this time, the receiving unit may store the image data in the memory module for a predetermined time, and may preferably store the image data in units of frames.

Thereafter, the receiver controls the mode of the transmission buffer and transmits the stored frame to the transmitter (step S323). The receiving unit can set the mode of the transmission buffer to the on mode or the off mode. At this time, in the ON mode, the transmission buffer has a low impedance state, and in the OFF mode, the transmission buffer has a high impedance, so that power can not be supplied.

The receiving unit may preferably transmit the stored image data to the transmitting unit on a frame-by-frame basis, and at the same time, set the mode of the transmitting buffer to the ON mode to supply power to the transmitting unit.

Finally, the transmitting unit transmits the received video data to the outside (step S330). The transmitting unit may generate the converted signal including the LVDS electrical characteristic of the image data transmitted in frame units, and may transmit the generated converted signal to the outside. At this time, when the mode of the transmission buffer is ON, the transmission unit is set to the transmission mode to receive the conversion signal, and when the mode of the transmission buffer is OFF mode, the transmission unit is set to the power saving mode It may not consume power.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Low power LVDS image transmission device
110: Receiver 111: Control module
113: memory module 115: transmission buffer
130: Transmission unit 200: Low power LVDS image transmission system
210:

Claims (12)

An infrared camera for capturing an image using infrared rays;
A receiving unit which receives image data photographed by the infrared camera and controls the flow of the image data by using a predetermined value,
And a transmitting unit for receiving the image data whose flow is controlled by the receiving unit and transmitting the image data to the outside,
The transmitter may further comprise:
A transmission mode or a power saving mode is set according to whether the image data is transmitted from the receiving unit,
The receiver may further comprise:
A transmission buffer for determining a mode of the transmission unit;
A control module for controlling the flow of the image data transmitted from the outside and setting and controlling a mode of the transmission buffer;
And a memory module for storing the image data for a predetermined time under the control of the control module and transmitting the stored image data to the transmitter,
The transmission buffer includes:
On mode or an off mode, and in the on mode, the transmission buffer is set to a low-Z state having a low impedance so that electric power can be supplied to the transmission buffer, and in the off mode, The transmission buffer is set to a high-Z (Hi-Z) state having a high impedance so that power is not supplied to the buffer,
The control module includes:
And changing the impedance of the transmission buffer to change the transmission buffer to an on mode or an off mode,
The control module includes:
Wherein the control unit controls the transmission and reception of the video data to be transmitted and received in units of frames and controls transmission of the frame stored in the memory module to the transmission unit every time one frame of the video data is stored, When the one frame is transmitted to the outside through the transmission unit, the mode of the transmission buffer is changed from the on mode to the off mode,
The transmitter may further comprise:
Wherein the transmission module receives the frame from the memory module to generate a conversion signal including LVDS electrical characteristics and transmits the conversion signal to the outside, and sets a transmission mode in which power is supplied to the transmission unit when the transmission buffer is in the ON mode, The power saving mode in which power supply to the transmission unit is stopped when the transmission buffer is in the off mode,
The receiver may further comprise:
And a parallel stream data interface driven by a clock of 85 MHz or less. The parallel stream data may be configured with a maximum of 24 bits,
The transmitter may further comprise:
And a stream data interface driven by a fixed clock of 85 MHz. The parallel stream data is fixed to 4 bits,
The control module includes:
Wherein the transmission buffer is configured to buffer a difference between a clock and a driving speed of the receiving unit and a clock and a driving speed of the transmitting unit using the transmission buffer.
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