WO2012034523A1

WO2012034523A1 - Data transmission method and data receiving device

Info

Publication number: WO2012034523A1
Application number: PCT/CN2011/079675
Authority: WO
Inventors: 李照华
Original assignee: 深圳市明微电子股份有限公司
Priority date: 2010-09-16
Filing date: 2011-09-15
Publication date: 2012-03-22
Also published as: CN101964171B; CN101964171A

Abstract

A data transmission method and a data receiving device are provided. The data receiving device receives data from a data line and contains M-numbered data ports (10), wherein each data port (10) contains a memory area with N-numbered data bits. When n bits of data are required to be transmitted to each data port (10), the data transmission method comprises the following steps: S01, the t-th M bits of data are transmitted to the (N-t+1)-th data bit of each of the M-numbered data ports (10), the data receiving device sends the (N-t+1)-th bit of data latching signal; S02, with the setting t=t+1, step S01 is repeated until t is equal to n; and S03, the data receiving device sends the entire data latching signal. By the method of transmitting the same number of data bits of data via different ports at the same time, the actual required data volume is transmitted. Therefore, when the transmission data volume is reduced, only the corresponding data volume needs to be transmitted; and compared with the traditional data transmission method, the data transmission rate is increased.

Description

Data transmission method and data receiving device

The present invention relates to the field of data transmission methods and data receiving devices, and more particularly to data transmission and devices for driving devices of flat panel displays. Background technique

Compared with a flat picture carrier such as a printed matter, a display control device such as a flat panel display device has the advantage of constantly changing characters, graphics or colors, and has gradually become a new favorite of advertising media and household consumption. The constant change of the picture is realized by continuously updating the drive data of the flat panel display device. For a flat panel display device such as a monochrome screen, the data is controlled to realize the brightness of the pixel that the human eye can perceive to update the screen. For a relatively complex full-color screen, people need the pixel not only to achieve the light or the light that the human eye can perceive, but also to display different brightness to achieve different color display.

There are currently two ways to achieve control over the brightness of this pixel. They are analog dimming and pulse width modulated pulse dimming. Analog dimming means that the amount of current flowing through the LED (Light Emitting Diode) is adjusted by the written data to change the brightness of the LED. Pulse width modulation pulse dimming refers to adjusting the time width of the LED on or off for a period of time. When the LED is turned on, it is driven by a fixed current and can be set by an external resistor. When the LED is turned off, no current flows. Thus, the display effect in a certain period of time is that the brightness of the lamp has changed. And the longer the light is on during this fixed time, the overall effect is that the light is brighter. This can achieve the purpose of brightness adjustment of the LED in a certain period of time. Both of these methods require the writing of the required data in the drive of the pixel. When the speed requirement is met, the fewer the data lines, the lower the cost and the easier the system design. The common practice now is the way serial data is entered. For cost and system optimization considerations, typically one drive drives more than one LED. For example, the general configuration of driving LED screens on the market today is: A driver chip drives sixteen LEDs or sixteen strings of LEDs, or sixteen pixels.

Now the data transmission of the universal LED screen driver chip uses the three-line Daisy-Chain topology. Figure 1. The data line (SDI) is a cascaded line. Clock line (DCLK) And the latch line (LE) is a shared line. The data line (SDI) cooperates with the clock line (DCLK) to obtain the required data; the latch line (LE) cooperates with the clock line (DCLK) to obtain the desired control command. For example, the high-speed time of the latch line, the number of rising edges of the clock line (DCLK), as the control command category. As shown in Figure 2. The advantage of this method is that it can achieve a high data transfer rate and is easy to control.

Based on the above transmission protocol, referring to Figure 3, the traditional data transmission process is as follows: Serial input data through the data line SDI, when the N-bit data of the first port is sent, it is latched to the corresponding port. In this way, when the N-bit data of the Mth port is sent out, it is latched to the corresponding port, and at the same time, the overall latch instruction is sent to perform overall data latching. This data is used for output display. Where N is the display accuracy of each pixel and also determines the gray level. For example, if N=16, then the gray level is ²¹⁶ = ⁶⁵⁵³⁶ . M is the number of pixels that each drive device can drive. For example, M=16, then the drive can drive 16 pixels.

If the display accuracy is not lowered, the N-bit data precision is shown in the above example, and the transmitted data is applied to the display of the drive port, that is, each bit of data is valid. However, in applications, such drives may be applied to static screens or to dynamic screens. There are also differences in the requirements for display accuracy. For example, when used in a dynamic screen, the accuracy requirements for display data are reduced, for example, from 16-bit data precision (65536 gray scale) to 12-bit data precision (4096 gray scale), but The traditional three-wire transmission protocol has the following drawbacks: If the required data accuracy is reduced to twelve bits, the transmitted data still needs to be in the format of sixteen bits of data per port. Since the lower four bits are not required, the lower four bits are captured. In the case of 0, the amount of data transferred is still 16*16=256 bits. Thus, according to this transmission process, it is necessary to add some invalid data, so that in the case where the accuracy of the data is lowered, the amount of data transmitted is not different from the previous one, that is, the accuracy is lowered and the data transmission rate is unchanged. These drawbacks become more and more obvious as people become more and more demanding for the versatility of the drive and the speed of the system. People need a more efficient method of data transmission. When the display accuracy is lowered, there is no need to send invalid data, that is, the accuracy is lowered and the data transmission rate is increased. Summary of the invention

In order to solve the above problem, an embodiment of the present invention provides a data transmission method, which is characterized by The data receiving device receives data from the data line, the data receiving device includes M data ports, each data port includes a storage area of N bits of data bits, when each data port needs to transmit n bits of data, wherein The method includes the steps of:

501. Transmit the t-th group M-bit data to the (N-t+1)-bit data bits of the M data ports, and the data receiving apparatus receives the (N-t+1)-bit data latch signal.

502, set t=t+l, repeat step S01 until t=n;

503. The data receiving device receives an overall data latch signal.

Where M, N, and n are positive integers, and n<=N, t>=l.

Another aspect of an embodiment of the present invention also provides a computer program for performing the above data transmission method.

Another aspect of an embodiment of the present invention also provides a computer readable medium having computer executable components for carrying a computer program for performing the data transfer method described above.

In addition, an embodiment of the present invention further provides a data receiving apparatus using the above method, the apparatus comprising: at least one data port for storing received data and providing data to an external system, including a first data latch a unit and a second data latch unit, the first data latch unit including at least one bit of data, wherein the same data bit of each data port is connected by a same bit latch signal, the second data latch The unit is configured to store data latched from the first data latch unit;

The control instruction unit sends a control instruction to the first data latch unit through the bit latch signal, and sends a control command to the second data latch unit through the overall data latch signal;

The data transfer unit receives data from the data line and transmits the data to the first data latch unit.

According to the data transmission method of the present invention, the amount of data actually required is transmitted by the same method of transmitting data of the same data bit of different ports, so that when the amount of transmitted data becomes small, only the corresponding amount of data is transmitted, compared with the conventional The three-wire transmission increases the data transfer rate. In the application of the flat panel display driving data transmission, when the amount of transmitted data becomes small, the transmission rate is increased, and in the case of ensuring the refresh rate of the entire screen, the system can control more chips by using the method of the invention, so that the whole screen Less system data transmitting means is required.

The additional aspects and advantages of the invention will be set forth in part in the description which follows. 酎3⁄4 instructions

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

Figure 1 shows a schematic diagram of a data transmission system for three-wire transmission;

Figure 2 shows a data transmission waveform diagram of a three-wire transmission;

Figure 3 shows the three-wire transmission protocol flow;

Figure 4 is a flow chart showing the data transmission of the three-wire transmission embodiment;

FIG. 5 illustrates a transport protocol flow according to an embodiment of the present invention;

FIG. 6 shows a flow chart of data transmission according to an embodiment of the present invention; FIG.

FIG. 7 shows a data transmission receiving apparatus according to an embodiment of the present invention. detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

For the traditional three-wire transmission, in the case of reduced data accuracy, the same amount of data still needs to be transmitted, so the accuracy is lowered and the data transmission rate is unchanged. The present invention provides a data transmission method and a data receiving apparatus. In the case where the data precision is lowered, only a corresponding amount of data is transmitted, thereby increasing the rate of data transmission.

For the purpose of realizing the present invention, the present invention proposes a data transmission method, the data receiving apparatus receives data from a data line, the data receiving apparatus includes M data ports, and each data port includes storage of N-bit data bits. Zone, when each data port needs to pass n bits of data, the method includes the steps:

502, set t=t+l, repeat step S01 until t=n;

503. The data receiving device receives an overall data latch signal. Where M, N, and n are positive integers, and n<=N, t>=l.

In the following, the method of the present invention and the traditional three-wire transmission will be described in detail by using 16 ports, each port has 16 data bits, but each port only needs to transmit 12 bits of data, and is used for displaying data transmission of the driving device. In the embodiment, there are 16 display drive ports for each drive device, and the data precision that each port can achieve is 16 bits, but the data precision required to be implemented this time is 12 bits.

Referring to FIG. 5 and FIG. 6, the first group of 16 data is received from the data line, and the data line can transmit data in serial transmission, to the 16th bit of 16 ports, and receive the 16th bit data latch. Signal, and then continue to receive the second set of 16 data, transmit to the 15th bit of the 16 ports, and receive the 15th bit data latch signal, continue to repeat this step until receiving the twelfth set of 16 data, It is transmitted to the 5th bit of 16 ports, and receives the bit data latch signal of the 5th bit. At the same time, it receives the whole data latch signal, so that all the required data is received, and the amount of data transmitted is 12*16 . In turn, the 12-bit data for each port can be transferred to an external system. In an embodiment applied to display drive data transmission, the external system can be a port display processing unit, such as a PWM processing unit.

For the conventional three-wire transmission, referring to FIG. 3 and FIG. 4, 16-bit data is serially transmitted to the first port through the data line, and the latch signal of the first port is transmitted, and then 16-bit data is transmitted to the second port. And send the latch signal of the second port, repeat this step, until the data of 16 ports is transmitted, send the whole data latch signal. The overall data latch is used directly for the output display. Among the 16-bit data of each port, only 12 bits are valid data, and the other lower 4 bits are complemented by 0. The amount of data transmitted is 16*16, and the effective data is 12*16. Due to the addition of invalid data, the amount of data transferred does not change and the transmission speed does not change when the required amount of data becomes small. Compared with the traditional three-wire transmission method, in the data transmission method of the embodiment of the present invention, the required data amount becomes small, and only the corresponding data amount is transmitted, and the data transmission rate is improved, and further, the refresh rate of the entire screen is ensured. Next, using the method of the present invention, the system can control more chips, so that the entire screen requires fewer system data transmitting devices.

The above is the data transmission whose required data amount is smaller than the actual data bit of the port. For the data transmission where the required data amount is equal to the actual data bit of the port, for example, each port has 16 data bits and each port needs to pass 16 bits of data, There is no difference in the amount of data transferred between the two methods. The method of data transmission, the present invention also proposes a method for performing data transmission in the above embodiment by a computer program.

Based on the above method of data transmission, the present invention also provides a computer readable medium having computer executable means for carrying a computer program for executing the data transmission method in the above embodiment.

Furthermore, the present invention also provides a data receiving apparatus using the above method. Referring to Figure 7, the data transmission receiving apparatus includes at least one data port 10, a control command unit 20, and a data transmission unit 30.

Specifically, the cooperation between the various parts is as follows:

At least one data port 10 for storing received data and providing data to an external system, including a first data latch unit and a second data latch unit, the first data latch unit including at least one bit of data bits, The same data bit of each data port is connected by the same bit latch signal, and the second data latch unit is used for storing data latched from the first data latch unit.

Specifically, since the bit latch is updated for one data bit of each port, for each port, when the data is incoming, the upper bit may be the updated data, and the lower bit is the last display data. For the correct display of the port, the data stored in the update process should be buffered between the port display and the port display. The first data latch unit is the buffer unit for displaying the data before the display, and can pass some RAM. Unit construction. The second data latch unit stores data latched from the first data latch unit and can be directly transmitted to an external system for application.

The control command unit 20 transmits a control command to the first data latch unit through the bit latch signal, and transmits a control command to the second data latch unit through the overall data latch signal. The control command unit is used to decompose the control commands that the system needs to transmit. It can be obtained by counting the rising edge of the clock line in the high level of the latch signal. In the embodiment of the present invention, there are bit latches and integral latches, and may also include other instruction decoding, and corresponding instructions may be generated by a unit such as a counter or a monostable flip-flop.

The data transfer unit 30 receives data from the data line and transmits it to the first data latch unit. The data transfer unit 30 may include a serial-to-parallel converter, which may be serially connected by a D flip-flop or the like.

The data received by the data line is transmitted in serial mode.

The port can be connected to the external system 40 via a second data latch unit. Applied to flat In an embodiment of the data transmission of the drive device of the board display, the external system 40 includes a port display processing unit for synchronously displaying data from the data port, the display processing unit may include a PWM processing unit, and may be digitally compared by the storage unit Modules such as drives and drive units are built.

The data transmission method and the data receiving apparatus of the present invention have been described in detail above, and the actual amount of data required is transmitted by the same method of transmitting data of the same data bit of different ports, so that when the amount of transmitted data becomes small, only By sending the corresponding amount of data, the data transfer rate is increased relative to the conventional three-wire transmission. In the application of the flat panel display driving data transmission, when the amount of transmitted data becomes small, the transmission rate is increased, and in the case of ensuring the refresh rate of the entire screen, the system can control more chips by using the method of the invention, so that the whole screen Less system data transmitting means is required.

A person skilled in the art can understand that all or part of the steps carried by the method of the foregoing embodiment can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. , including one or a combination of the steps of the method embodiments.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as separate products, may also be stored in a computer readable storage medium.

The above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

The above description is only an embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

Claim

What is claimed is: 1. A data transmission method, characterized in that: a data receiving device receives data from a data line, the data receiving device comprises M data ports, each data port comprising a storage area of N-bit data bits, when each data When the port needs to pass n bits of data, the method includes the steps:

502, set t=t+l, repeat step S01 until t=n;

503. The data receiving device receives an overall data latch signal.

Where M, N, and n are positive integers, and n<=N, t>=l.

2. The method of claim 1, after the step S03, further comprising transmitting n-bit data of the data port to an external system.

3. The method of claim 1 wherein the manner of receiving data from the data line is a serial transmission.

4. The method of claim 1 wherein the data received from the data line comprises at least n*M bit data.

A computer program, characterized by the method for performing the display control according to any one of claims 1 to 4.

A computer readable medium having computer executable components, characterized by a computer program for carrying a method of performing display control according to any one of claims 1 to 4.

7. A data receiving device, the device comprising:

At least one data port for storing the received data and providing data to an external system, including a first data latch unit and a second data latch unit, the first data latch unit including at least one bit of data bits, wherein The same data bit of each data port is connected by the same bit latch signal, the second data latch unit is used for storing data latched from the first data latch unit; the control command unit is latched by bit The signal sends a control command to the first data latch unit, and sends a control command to the second data latch unit through the overall data latch signal;

8. The apparatus according to claim 7, wherein the manner of receiving data from the data line is Serial transmission.

9. Apparatus according to claim 7 wherein said data transfer unit comprises a serial to parallel converter for serial input and parallel processing of data.

10. Apparatus according to claim 7 wherein said port is coupled to an external system via a second data latch unit.

11. The apparatus of claim 10, the external system comprising a port display processing unit for synchronously displaying data from a data port.

12. Apparatus according to claim 11 wherein said port display processing unit comprises a PWM processing unit.