TWI701656B - Drive circuit, display device and information processing device - Google Patents

Abstract

A drive circuit includes a non-volatile memory, a bus decoding unit and a register, and is characterized by having: a table link unit for receiving a working register table from an application processor, Or read a working register table from the non-volatile memory when power is on; and a table decoding unit for temporarily storing the working register table, and for controlling all the working registers according to a mode signal The working register table is written into the register via the bus decoding unit; or the working register table is written into the register via the bus decoding unit according to a mode switch command output by the bus decoding unit In this register.

Description

Drive circuit, display device and information processing device

The present invention relates to a display device driver, in particular to a display device driver that can automatically switch the contents of a work register table.

The work register table of the display driver is usually divided into a user register (User Register) form CMD1 and a manufacturer register (Manufacturer Register) form CMD2 or CMD3. Please refer to Table 1, which records part of CMD1; and Table 2, which records part of CMD2.

Table 1 CMD1 name Address/Command parameter SLPIN 0X10 0 SLPOUT 0X11 0 RGB000 0X70 3 RGB001 0X71 3

Table 2 CMD2 name Address/Command parameter OTP burning DISP_COM 0X00 4 Y DISP_SEQ 0X05 4 Y TE_CFG 0X09 3 Y TCON_STS 0XF6 2 N

CMD1 is generally a table generated with reference to the MIPI (mobile industry processor interface) standard and is open to customers; CMD2 or CMD3 is generally a table for IC manufacturers to use themselves (maybe a small part is open to customers) , And most of them are burned in the corresponding non-volatile memory (such as OTP, MTP, FLASH), for example, according to customer requirements, the initial value of CMD2 or CMD3 is burned in a non-volatile memory before leaving the factory In order to meet customer needs. In addition, customers usually want to use simple instructions as much as possible, and the less intervention in the driver IC, the better, so as to avoid the operation of the driver IC taking up too much time for the application processor.

However, the contents of the register provided by CMD2 or CMD3 usually can only maintain a fixed configuration and cannot adapt to different application requirements. If dynamic changes are required, application processor intervention is required. In addition, some registers provided by CMD2 or CMD3 will store multiple versions of instructions and working modes, so that they can change with different application requirements, but this must be planned in advance during the IC design process. If the IC design goes offline If there are additional requirements after (Tape Out), the application processor needs to change the content of the corresponding additional register in a timely manner. However, even if the application processor has enough free time to plan additional registers, because the application processor generally has to serve several peripheral units, the planning may be interrupted by high-priority interrupt requests at any time. There is no guarantee that the contents of the additional register will be switched in time. Please refer to FIG. 1, which illustrates the programming timing of the working register of a conventional display driver in the process of switching working modes. As shown in Figure 1, after an interface signal S _MIPI responds to a Sleep-Out command and changes from a low potential state that represents sleep to a high potential state that represents exit from sleep, the relevant configuration of the working register will start at a period of time. After the delay, if the application processor encounters a higher priority interrupt program, it will work when a configuration switching signal S _{MSW is} switched (herein, the drive is switched to the normal operating mode). The configuration of the register may not be changed, which may affect the quality of the display.

In order to solve the above problems, a novel dynamic programming method for the register of the display driver is urgently needed in the art.

An object of the present invention is to provide a driving circuit that can automatically specify and plan the corresponding register in time according to different working modes, so as to meet the requirements of different working modes.

Another object of the present invention is to provide a driving circuit which can designate and plan the corresponding register in time according to the control of at least one mode signal to meet the requirements of different working modes.

Another object of the present invention is to provide a driving circuit, which can designate and plan the corresponding register in time by monitoring whether a bus has a working mode command to meet the requirements of different working modes.

To achieve the above objective, a driving circuit is proposed, which includes a non-volatile memory, a bus decoding unit and a register, and is characterized by:

A table link unit for receiving a working register table from an application processor or reading a working register table from the non-volatile memory when power is on; and

A table decoding unit for temporarily storing the working register table, and for writing the working register table into the register via the bus decoding unit according to the control of a mode signal; Or according to a mode switch command output by the bus decoding unit, the working register table is written into the register via the bus decoding unit.

In one embodiment, the mode switching command is generated by the bus decoding unit by monitoring a bus.

In one embodiment, when the bus decoding unit detects that a new working mode command appears on the bus, it outputs the mode switching command to the table decoding unit and updates the working register in time form.

In a possible embodiment, the mode signal is a pre-defined flag signal, and it can be determined by the edge, potential, value, or value change direction of a state signal.

In addition, the present invention further discloses a display device having a display screen and a driving circuit as described above for driving the display screen, so that the display device can automatically switch the content of the working register according to different application requirements. Provide a good picture display effect.

In addition, the present invention further discloses an information processing device, which has a central processing unit and the aforementioned display device, wherein the central processing unit is used to communicate with the driving circuit.

In possible embodiments, the information processing device can be a smart phone or a portable computer device.

In order to enable your reviewer to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are attached as follows.

Please refer to FIG. 2, which shows a block diagram of an embodiment of the driving circuit of the present invention. As shown in FIG. 2, a driving circuit 110 has a table connection unit 111, a non-volatile memory 112, a table decoding unit 113, a bus decoding unit 114, and a register 115. The driving circuit 110 is connected to An application processor 120 is coupled to a bus.

The table link unit 111 is used to couple with the non-volatile memory 112, the table decoding unit 113, and the application processor 120 to write a work register table into the non-volatile memory 112 or read from the non-volatile memory 112 Take a work register table, and send the work register table to the table decoding unit 113. During operation, the table linking unit 111 can read the working register table from the non-volatile memory 112 and send it to the table decoding unit 113 upon power-on; or the table linking unit 111 can receive it from the application processor 120 The working register table is sent to the table decoding unit 113.

The table decoding unit 113 is coupled to the table concatenation unit 111 and the bus decoding unit 114, and in operation, the table decoding unit 113 is controlled by a mode signal S _MODE to pass the working register table through the bus decoding unit 114 is written into the register 115; or the working register table is written into the register 115 via the bus decoding unit 114 according to a mode switching command output by the bus decoding unit 114, wherein the mode switching The command is generated by the bus decoding unit 114 by monitoring the bus, that is, when the bus decoding unit 114 detects that a new operating mode command appears on the bus, it outputs the mode switching command to The table decoding unit 113 updates the working register table in time.

In addition, the mode signal S _MODE can be a pre-defined flag signal, such as a signal representing a working state or working mode, and it can be determined by the edge, potential, value, or value change direction of a state signal.

In addition, the present invention further discloses a display device. Please refer to FIG. 3, which shows a block diagram of an embodiment of the display device of the present invention. As shown in FIG. 3, a display device 200 has a driving circuit 210 and a display screen 220, and the driving circuit 210 has a driving circuit 110 and an application processor 120 as shown in FIG. 2, so that the display device 200 can be different The application needs to automatically switch the content of the work register to provide a good screen display effect.

In addition, the present invention further discloses an information processing device. Please refer to FIG. 4, which shows a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 4, an information processing device 300 has a central processing unit 310 and a display device 320, wherein the display device 320 has a driving circuit 210 and a display screen 220 as shown in FIG. 3, and the central processing unit 310 is used To communicate with the driving circuit 210 of the display device 320.

In possible embodiments, the information processing device 300 may be a smart phone or a portable computer device.

With the design disclosed above, the present invention has the following advantages:

1. The drive circuit of the present invention can automatically specify and plan the corresponding register in time according to different working modes to meet the requirements of different working modes.

2. The driving circuit of the present invention can designate and plan the corresponding register in time according to the control of at least one mode signal to meet the requirements of different working modes.

3. The driving circuit of the present invention can by monitoring whether a bus has a working mode command to designate and plan the corresponding register in time to meet the requirements of different working modes.

The disclosure in this case is a preferred embodiment, and any partial changes or modifications that are derived from the technical ideas of the case and can be easily inferred by those who are familiar with the art do not deviate from the scope of the patent right of the case.

In summary, regardless of the purpose, means, and effects of this case, it is shown that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. Please check it out and grant the patent as soon as possible. Society is for the best prayer.

110: drive circuit

111: Table Link Unit

112: Non-volatile memory

113: table decoding unit

114: bus decoding unit

115: register

120: application processor

200: display device

210: drive circuit

220: display

300: Information Processing Device

310: Central Processing Unit

320: display device

FIG. 1 illustrates the programming timing of the working register of a conventional display driver in the process of switching working modes. FIG. 2 shows a block diagram of an embodiment of the driving circuit of the present invention. FIG. 3 shows a block diagram of an embodiment of the display device of the present invention. FIG. 4 shows a block diagram of an embodiment of the information processing device of the present invention.

110: drive circuit

111: Table Link Unit

112: Non-volatile memory

113: table decoding unit

114: bus decoding unit

115: register

120: application processor

Claims (7)

A drive circuit includes a non-volatile memory, a bus decoding unit and a register, and is characterized by having: a table link unit for receiving a working register table from an application processor, Or read a working register table from the non-volatile memory when power is on; and a table decoding unit for temporarily storing the working register table, and for controlling all the working registers according to a mode signal The working register table is written into the register via the bus decoding unit; or the working register table is written into the register via the bus decoding unit according to a mode switch command output by the bus decoding unit In this register. The driving circuit according to claim 1, wherein the mode switching command is generated by the bus decoding unit by monitoring a bus. The driving circuit according to claim 2, wherein when the bus decoding unit detects that a new operating mode command appears on the bus, it outputs the mode switching command to the table decoding unit and updates all the commands in time. The work register table described. The driving circuit according to claim 1, wherein the mode signal is a pre-defined flag signal, and it is determined by an edge, potential, value, or value change direction of a state signal. A display device having a display screen and a driving circuit as described in any one of claim items 1 to 4 for driving the display screen, so that the display device can automatically switch the working temporary storage according to different application requirements The content of the form of the monitor provides a good screen display effect. An information processing device having a central processing unit and the display device according to claim 5, wherein the central processing unit is used to communicate with the driving circuit. The information processing device described in claim 6, which is a smart phone or a portable computer device.

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