TWI650746B - Display driver - Google Patents

Abstract

A display driving device includes a high-resolution multimedia interface input interface and a core unit. The core unit is electrically connected to the high-resolution multimedia interface input interface to receive a display input data from a video card of a computer host. The display input data includes a parameter data and a video data related to a light-emitting diode display unit, and the core unit converts the video data to video according to the parameter data to generate a Input display output data, and then send the display output data to the LED display unit. The display driving device can be connected in series to control more light emitting diode display units, so as to achieve low complexity and low cost.

Description

Display driver

The invention relates to a display driving device, in particular to a display driving device for driving a light-emitting diode display unit.

The conventional light-emitting diode display screen (for example, digital signage) includes a plurality of light-emitting diode display units, and each light-emitting diode display unit includes a constant current driving chip, an X-channel transistor chip, and a light Diode array, X = 2 ^K , the light-emitting diode array includes X times Y light-emitting diodes, X, K, and Y are positive integers. The light-emitting diode display units need to send video data to a light-emitting diode (LED) sending card (Sending Card) through a digital video interface (Digital Visual Interface; DVI) cable through a video card of a computer host ), And transmit the parameter data to the light-emitting diode sending card via a universal serial bus (USB) cable. The light emitting diode sending card performs video conversion on the video data, and then transmits the converted data to a plurality of light emitting diode receiving cards (Receiving Card) connected in series for image processing, and then respectively controls The plurality of light-emitting diode display units emit light correctly. However, when the screen size of this conventional light-emitting diode display is large, it is often necessary to use more than one light-emitting diode sending card and a large number of light-emitting diode receiving cards, such as dozens One or hundreds of light-emitting diode receiving cards. Because the cost of these sending cards and receiving cards is not low, plus the power lines between the devices, the universal serial bus connection line, the digital video interface connection line, and the network connection line between the light emitting diode transmission cards, etc. As the number increases, it becomes more complicated, so it becomes a problem to be solved.

Therefore, the object of the present invention is to provide a display driving device with low complexity and low cost.

Therefore, the display driving device of the present invention is suitable for electrically connecting a computer host including a video card, and a light-emitting diode display unit, and includes a High Definition Multimedia Interface (HDMI) input interface, and A core unit.

The high-resolution multimedia interface input interface is electrically connected to the video card of the computer host. The core unit is electrically connected to the high-resolution multimedia interface input interface to receive a display input data from the video card. The display input data includes a parameter data and a video data related to the light-emitting diode display unit. The core unit converts the video data according to the parameter data to generate a display output data conforming to the input format of the light emitting diode display unit, and then transmits the display output data to the light emitting diode display unit.

In some embodiments, the light-emitting diode display unit includes a constant current driving chip, an X-channel transistor chip, and a light-emitting diode array, X = 2 ^K , the light-emitting diode array includes X times With Y light emitting diodes, X, K, and Y are positive integers, where the display output data includes K column control signals, a data signal, a clock signal, a latch enable signal, and an output enable Signal, the core unit transmits the K column control signals to the X-channel row transistor chip, and transmits the data signal, the clock signal, the latch enable signal, and the output enable signal to the constant current drive Wafer.

In some embodiments, the parameter data includes information on the number, series connection, and bias voltage of the light-emitting diodes included in the light-emitting diode array.

In some embodiments, the display driving device further includes a high-resolution multimedia interface output interface electrically connected to the core unit. When the N light-emitting diode display units require M display drive devices to correctly display the video content corresponding to the video data, the M display drive devices are connected in series and defined as a first display drive device and a The second display drive device ..., and an Mth display drive device. The first display driving device receives the display input data through the high-resolution multimedia interface input interface of the first display driving device, and the i-th display driving device passes the display input data through the high-resolution of the i-th display driving device The resolution multimedia interface output interface and the high-resolution multimedia interface input interface of the i + 1th display drive device are transmitted to the core unit of the i + 1th display drive device, where N and M are both positive Integer and N greater than or equal to M, i = 1, 2 ..., M-1.

In other embodiments, the display driving device further includes a buffer, the buffer is electrically connected between the core unit and the light-emitting diode display unit, and includes K + 4 input terminals to receive the K column control signals, the data signal, the clock signal, the latch enable signal, and the output enable signal, and also includes K + 4 output terminals to amplify the received signal to enhance its driving Ability to transmit the amplified K column control signals to the X-channel row transistor chip, and transmit the amplified data signal, the clock signal, the latch enable signal, and the output enable signal to This constant current drives the wafer.

In some embodiments, the core unit includes an integrated circuit bus (Inter-Integrated Circuit; I ² C) interface to receive the parameter data from the video card of the computer host.

In some embodiments, the display driving device further includes a power module to provide the operating power of the core unit.

The function of the present invention lies in that the core unit of the display driving device receives the parameter data and the video data from the video card through the high-resolution multimedia interface input interface through the HDMI transmission line, so that the overall computer host and the display The connection circuit between the driving device and the light-emitting diode display unit becomes simpler, especially when multiple display driving devices are required, the effect is more significant, and the manufacturing cost is lower than that of the conventional sending card And receive the card, so it can achieve the effect of cost.

1‧‧‧Display drive device

11‧‧‧Core unit

111‧‧‧I ² C interface

12‧‧‧Buffer

13‧‧‧HDMI input interface

14‧‧‧HDMI output interface

15‧‧‧Power Module

2‧‧‧computer host

21‧‧‧Video card

9‧‧‧ LED display unit

91‧‧‧Four channel tube chip

92‧‧‧Constant current driver chip

931 ~ 934‧‧‧ LED

941 ~ 944‧‧‧ LED

951 ~ 954‧‧‧ LED

961 ~ 964‧‧‧ LED

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which:

FIG. 1 is a block diagram illustrating an embodiment of the display driving device of the present invention.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same number.

Referring to FIG. 1, an embodiment of the display driving device 1 of the present invention is suitable for electrically connecting a computer host 2 including a video card 21 and a light-emitting diode display unit 9. The light-emitting diode display unit 9 includes a constant current driving chip 92, an X-channel tube chip, and a light-emitting diode array, X = ^2K , the light-emitting diode array includes X times Y light-emitting diodes Polar bodies 931 ~ 934, 941 ~ 944, 951 ~ 954, 961 ~ 964, X, K, and Y are positive integers. It should be particularly emphasized that: in this embodiment, for the sake of convenience, FIG. 1 takes X = 4, K = 2, and Y = 4 as examples, that is, the X-channel line tube wafer is a four-channel line The wafer 91, but in other embodiments, X, Y, K may also be other values, such as: K = 3, X = 8, Y = 5, not limited to this.

The display driving device 1 includes a high definition multimedia interface (High Definition Multimedia Interface; HDMI) input interface 13 and a core The core unit 11, a high-resolution multimedia interface (HDMI) output interface 14, a buffer 12, and a power module 15.

The high-resolution multimedia interface input interface 13 is electrically connected to the video card 21 of the computer host 2 and the core unit 11. The high-resolution multimedia interface output interface 14 is electrically connected to the core unit 11. The buffer 12 is electrically connected between the core unit 11 and the light-emitting diode display unit 9. The power module provides the operating power of the core unit 11.

The core unit 11 receives a display input data from the video card 21 via the high-resolution multimedia interface input interface 13. The display input data includes a parameter data and a video data related to the LED display unit 9. The core unit 11 converts the video data according to the parameter data to generate a display output data conforming to the input format of the light emitting diode display unit 9, and then transmits the display output data to the light emitting diode display Unit 9.

More specifically, the core unit includes multiple functional modules, such as: a high-resolution multimedia interface (HDMI) receiver module (Receiver), a high-resolution multimedia interface (HDMI) transmitter module (Transmitter), a Gamma correction module (GAMMA), a memory control module (DDR Controller), a light emitting diode control module (LED Controller), etc. Among them, the high-resolution multimedia interface receiving module is responsible for parsing video data and island data packets (Data Island), and transmitting the video data to the next level (that is, the gamma correction module). The high-resolution multimedia The interface transmission module is responsible for sending video data and island data packets as custom island data packets according to the HDMI protocol. The gamma correction module adjusts the gamma curve of the image received by the received data to perform non-linear tone editing on the image, and detects the dark part and the light part in the image signal, and makes the two The proportion of the person increases, thereby improving the image contrast effect. The memory control module receives the processing result of the gamma correction module and is responsible for storing the frame image in the memory (DDR) and reading it out in a required format. The light-emitting diode control module receives the data read by the memory controller and is responsible for sending control signals and graphic data according to the bus protocol defined by the light-emitting diode display unit 9.

In more detail, the parameter data includes the number of LEDs 931 ~ 934, 941 ~ 944, 951 ~ 954, 961 ~ 964 included in the LED array, series connection method, bias voltage and other information . The display output data includes K column control signals, a data signal (Data), a clock signal (CLK), a latch enable signal (LE), and an output enable signal (OE). The core unit 11 transmits the K column control signals to the X-channel row transistor chip (ie, the four-channel row transistor chip 91), and transmits the data signal, the clock signal, the latch enable signal, and the output The enable signal is transmitted to the constant current driving chip 92. In addition, it should be added that the constant current driver chip 92 is a chip product that currently exists on the market, and it receives the data signal (Data), the clock signal (CLK), a latch enable signal (LE), and The control of the output enable signal (OE) enables the light emitting diode array to emit light normally.

The buffer 12 includes K + 4 inputs to receive the K column controls Signal, the data signal, the clock signal, the latch enable signal, and the output enable signal, and also includes K + 4 output terminals to amplify the received signal to enhance its driving ability, and will The amplified K column control signals are transmitted to the X-channel row transistor chip (ie, the four-channel row transistor chip 91), and the amplified data signal, the clock signal, the latch enable signal, and the The output enable signal is transmitted to the constant current driving chip. In this embodiment, K = 2, X = 4, and in other embodiments, K and X may be other values, for example, when K = 3, X = 8, the buffer 12 may be a 74HC245 buffer , Corresponding to the eight-channel row tube chip, and the potential at the input end is 3.3 volts, and the potential at the output end is 5 volts.

In addition, in this embodiment, the core unit 11 includes an integrated circuit bus (Inter-Integrated Circuit; I ² C) interface 111 to receive the parameter data from the video card 21 of the computer host 2. In other words, the core unit 11 may not receive the parameter data via the high-resolution multimedia interface input interface 13 but instead receive the parameter data from the video card 21 by the integrated circuit bus interface 111. In other embodiments, the integrated circuit bus interface 111 can also be omitted, and the core unit 11 receives the parameter data via the high-resolution multimedia interface input interface 13.

In addition, it should be particularly noted that in this embodiment, the display driving device 1 only drives one light emitting diode display unit 9 for convenience of description. In fact, the display driving device 1 can also drive multiple light emitting devices. Diode display unit 9, this It is determined by the number of signals that the core unit 11 can output, and is not limited to this.

Furthermore, when the screen size of a light-emitting diode display screen is large, that is, the light-emitting diode display screen includes a plurality of light-emitting diode display units 9, and it cannot be driven by only one display driving device 1 in this case The light-emitting diode display unit 9 hours. Suppose that a total of N light-emitting diode display units 9 require M display drive devices 1 to correctly display the video content corresponding to the video data. The M display drive devices 1 are connected in series and defined as a first display drive device, a second display drive device ..., and an M-th display drive device. The first display driving device receives the display input data via the high-resolution multimedia interface input interface 13 of the first display driving device, and the i-th display driving device passes the display input data via the i The high-resolution multimedia interface output interface 14 and the high-resolution multimedia interface input interface 13 of the i + 1th display driving device are transmitted to the core unit 11 of the i + 1th display driving device, where N and M are both positive Integer and N greater than or equal to M, i = 1, 2 ..., M-1.

In summary, the core unit 11 of the display driving device 1 uses the high-resolution multimedia interface input interface 13 to receive the parameter data and the video data from the video card 21 through the HDMI transmission line, so that the overall computer host 2. The connection circuit between the display driving device 1 and the light-emitting diode display unit 9 becomes simpler. Especially when multiple display drive devices 1 need to be used, and the high-resolution multimedia interface output interface 14 is used as a serial connection, the connection line in this case is more prominent. The single effect, plus the manufacturing cost of the display drive device 1 is also lower than the conventional sending card and receiving card, so it can indeed achieve the purpose of cost invention.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

Claims (6)

A display driving device is suitable for electrically connecting a computer host including a video card, and a light-emitting diode display unit. The light-emitting diode display unit includes a constant current driving chip, an X-channel tube chip, and a Light-emitting diode array, X = 2 ^K , the light-emitting diode array includes X times Y light-emitting diodes, X, K, and Y are positive integers, the display driving device includes: a high-resolution multimedia interface ( High Definition Multimedia Interface (HDMI) input interface, electrically connected to the video card of the computer host; and a core unit, electrically connected to the high-resolution multimedia interface input interface to receive a display input data from the video card, the display The input data includes a parameter data and a video data related to the light emitting diode display unit, the core unit converts the video data according to the parameter data into a video to generate an input format that conforms to the light emitting diode display unit Display output data, and then send the display output data to the light-emitting diode display unit, the display The output data includes K column control signals, a data signal, a clock signal, a latch enable signal, and an output enable signal. The core unit transmits the K column control signals to the X-channel row tube chip, And transmit the data signal, the clock signal, the latch enable signal, and the output enable signal to the constant current driving chip. The display driving device according to claim 1, wherein the parameter data includes information such as the number of light-emitting diodes included in the light-emitting diode array, the series connection mode, and the magnitude of the bias voltage. The display driving device described in claim 2 further includes a high-resolution multimedia interface output interface electrically connected to the core unit. When the N light-emitting diode display units require M display driving devices to correctly display the corresponding For video content of video data, the M display drive devices are serially connected and defined as a first display drive device, a second display drive device ..., and an M-th display drive device, the first display drive The device receives the display input data through the high-resolution multimedia interface input interface of the first display driving device, and the i-th display driving device outputs the display input data through the high-resolution multimedia interface of the i-th display driving device The interface and the high-resolution multimedia interface input interface of the i + 1th display drive device are transmitted to the core unit of the i + 1th display drive device, where N and M are both positive integers and N is greater than or equal to M, i = 1, 2 ..., M-1. The display driving device according to claim 2, further comprising a buffer electrically connected between the core unit and the light-emitting diode display unit, and includes K + 4 input terminals to receive the K The column control signal, the data signal, the clock signal, the latch enable signal, and the output enable signal, and also includes K + 4 output terminals to amplify the received signal to enhance its driving capability , And transmit the amplified K column control signals to the X-channel row transistor chip, and transmit the amplified data signal, the clock signal, the latch enable signal, and the output enable signal to the Constant current drive chip. The display driving device according to claim 4, wherein the core unit includes an integrated circuit bus (Inter-Integrated Circuit; I ² C) interface to receive the parameter data of the video card from the computer host. The display driving device according to claim 5, further comprising a power module to provide the operating power of the core unit.