CN112908226B - Method and device for detecting display screen parameter switching by using HDMI (high-definition multimedia interface) of PC (personal computer) host - Google Patents
Method and device for detecting display screen parameter switching by using HDMI (high-definition multimedia interface) of PC (personal computer) host Download PDFInfo
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- CN112908226B CN112908226B CN202110090685.3A CN202110090685A CN112908226B CN 112908226 B CN112908226 B CN 112908226B CN 202110090685 A CN202110090685 A CN 202110090685A CN 112908226 B CN112908226 B CN 112908226B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0125—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level one of the standards being a high definition standard
Abstract
A method for utilizing the HDMI interface of PC to switch over the detection to the display screen parameter, set up the switching device and is used for switching over the display screen and detecting the host computer and MCU connection relation inside the switching device of the bus, when changing the display screen, after MCU receives the requirement that the host computer will modify the screen parameter, let HDMI _ HP link with GND, the host computer thinks the screen loses the connection, close the video signal output; the MCU outputs a control signal to disconnect the I2C bus from the host, and then the EEPROM is connected with the MCU through the I2C bus; the MCU analyzes new EDID information sent by the host computer and writes the EDID information into the EEPROM through an I2C bus; the MCU reconnects the EEPROM to the host I2C; having HDMI _ HP reconnected to HDMI _5V0, the host believes that a new screen is connected to the HDMI interface; and reading new EDID information, and outputting a video signal to a newly replaced display screen according to the new video parameter. The purpose of outputting RGB signals of various parameters by using an HDMI interface is achieved, and the method can be used for detecting TFT-LCDs with different resolutions and different time sequence parameters.
Description
Technical Field
The invention relates to the technical field of liquid crystal displays, in particular to a method and a device for switching and detecting display screen parameters by utilizing a high-definition multimedia interface (HDMI) interface of a Personal Computer (PC) host.
Background
The present invention relates to a method for detecting a display screen, wherein, in the prior art, an FPGA or a middle-high SOC is used for generating a video signal for an RGB interface screen, and then various test pictures are played for detection.
The RGB signals are converted by using an HDMI interface of a common PC, however, as a detection device, screen parameters need to be replaced, a conventional HDMI screen is adopted, a host is connected with the screen through the HDMI interface, the host reads resolution and time sequence information (called EDID) of the screen from the HDMI interface, finally, a proper video signal is sent out to drive the screen, and the EDID information of the screen is burned in a factory and is not allowed to be modified by a user generally.
The mill of making the screen just produces a demand for the testing screen, and under the condition that HDMI did not reconnect, the display screen of connecting was changed in the operation, changes EDID, in order to realize this demand, needs a detection device that can direct can switch connection in the operation and be surveyed the display screen, convenient detection.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a method and a device for switching and detecting parameters of a display screen by using an HDMI (high-definition multimedia interface) of a PC (personal computer), which realize the purpose of outputting RGB (red, green and blue) signals of various parameters by using the HDMI, can be used for detecting TFT-LCDs (thin film transistor-liquid crystal displays) with different resolutions and different time sequence parameters, can allow the connected display screen to be directly replaced in operation under the condition that the HDMI is not reconnected, changes the EDID (extended display identification) of the display screen and is convenient for the detection process of the display screen.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for switching and detecting parameters of a display screen by utilizing a HDMI (high-definition multimedia interface) of a PC (personal computer) host comprises the following steps:
1) setting a switching device, wherein the switching device comprises an MCU, an EEPROM, an I2C bus switch, a reconnection switch, a voltage division circuit, an HDMI-to-RGB chip and an HDMI port, one end of the switching device is connected with a detection PC host through the HDMI port, and the other end of the switching device is connected with a detected display screen and is used for switching the connection relation between the detected display screen and the detection PC host as well as the MCU in the bus switching device;
2) the switching device supplies power and is connected with a display screen to be detected, the I2C bus end of the HDMI port of the switching device is connected to the HDMI interface of the PC host, the power-on default PC host is connected with the EEPROM of the switching device, and the HDMI _ HP of the HDMI port of the switching device is connected with the HDMI _5V0 of the HDMI interface of the PC host; the HDMI _ HP pin is a Hot-plug pin of the HDMI, the PC host detects the high and low levels of the pin to judge whether a screen is connected to the HDMI, and at the moment, the PC host considers that the HDMI is connected with a screen, reads the EDID in the current EEPROM and sends a video detection output signal to a display screen to be detected;
3) when the display screen is replaced, after the MCU receives a requirement that the PC host computer modifies screen parameters through the USB or the UART, the MCU outputs a control signal to connect the HDMI _ HP and the GND, and at the moment, the PC host computer considers that the screen is disconnected and closes the output of video signals; a GPIO of the single chip controls an output enabling pin of the HDMI-to-RGB chip, and RGB signal output is closed;
4) the MCU outputs a control signal to disconnect the I2C bus from the PC host, and is almost simultaneously reconnected to the I2C bus of the MCU, so that the EEPROM and the MCU are connected through the I2C bus;
5) the MCU analyzes new EDID information sent by the PC host and writes the EDID information into the EEPROM through an I2C bus;
6) the MCU outputs control signals again to ensure that the EEPROM is connected to the I2C of the HDMI of the PC host again;
7) the MCU outputs a control signal to reconnect the HDMI _ HP to the HDMI _5V0, and the PC host considers that a new screen is connected to the HDMI;
8) the PC host reads new EDID information and outputs video signals to a new display screen according to new video parameters; and one GPIO of the single chip controls an output enabling pin of the HDMI-to-RGB chip to restart RGB signal output.
The switching device for realizing the method for switching and detecting the parameters of the display screen by utilizing the HDMI interface of the PC host comprises an MCU, an EEPROM, an I2C bus switch, a reconnection switch, a voltage division circuit and an HDMI port; the input end of the I2C bus switch is connected with the I2C ports of the MCU and the EEPROM, and the output end is connected with the HDMI port through an I2C bus; one end of the reconnection switch is connected with a detection port HDMI _ HP of a display screen in the HDMI port, and the other end of the reconnection switch is connected with a power supply end or a GND end in the HDMI port; one end of the voltage division circuit is connected with the MCU, and the other end of the voltage division circuit is connected with the power supply end of the HDMI port.
The switching device further comprises an HDMI-to-RGB chip, one end of the HDMI-to-RGB chip is connected with the PC host through an HDMI port, and the other end of the HDMI-to-RGB chip is connected with the detected display screen.
Furthermore, the I2C bus switch includes two triode switch circuits, and control terminals of the two triode switch circuits are both connected to the MCU and are respectively used for switching SDA and SCL signal terminals of the I2C bus.
Furthermore, the reconnection switch is a triode switch circuit, and a control end of the reconnection switch is connected to the MCU and used for cutting off and resuming the connection between the detection port HDMI _ HP of the display screen and the power supply end or the GND end of the HDMI port.
Furthermore, the voltage dividing circuit is composed of two serially connected voltage dividing resistors, the upper end of the voltage dividing circuit is connected with a power supply end of the HDMI port, the lower end of the voltage dividing circuit is grounded, and the middle point of the two serially connected resistors is connected with the MCU and used for detecting the access of the PC host.
Furthermore, the switching device is also connected with a PC host through a USB port.
Compared with the prior art, the invention has the beneficial effects that:
in the prior LCD detection device for generating RGB signals by using SOC or FPGA, each product needs to generate software which is usually the same and different, and the difference is only screen resolution and time sequence information. The code volume required to be maintained is greatly reduced, the working complexity and difficulty of debugging programmers are reduced, and the working efficiency is improved.
Drawings
FIG. 1 is a circuit diagram of a switching detection device of a display panel according to the present invention;
FIG. 2 is a circuit diagram of the I2C bus switch of the present invention;
FIG. 3 is a circuit diagram of the EEPROM of the present invention;
FIG. 4 is a circuit diagram of the reconnect switch of the present invention;
FIG. 5 is a circuit diagram of a voltage divider circuit of the present invention;
FIG. 6 is a circuit diagram of the MCU of the present invention;
fig. 7 is an HDMI port diagram of the present invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
A method for switching and detecting parameters of a display screen by utilizing a PC HDMI interface comprises the following steps:
1) setting a switching device, wherein the switching device comprises an MCU, an EEPROM, an I2C bus switch, a reconnection switch, a voltage division circuit, an HDMI-to-RGB chip and an HDMI port, one end of the switching device is connected with a detection PC host through the HDMI port, and the other end of the switching device is connected with a detected display screen and is used for switching the connection relation between the detected display screen and the detection PC host as well as the MCU in the bus switching device;
2) the switching device supplies power and is connected with a display screen to be detected, the I2C bus end of the HDMI port of the switching device is connected to the HDMI interface of the PC host, the power-on default PC host is connected with the EEPROM of the switching device, and the HDMI _ HP of the HDMI port of the switching device is connected with the HDMI _5V0 of the HDMI interface of the host; the HDMI _ HP pin is a Hot-plug pin of the HDMI, the PC host detects the high and low levels of the pin to judge whether a screen is connected to the HDMI, and at the moment, the PC host considers that the HDMI is connected with a screen, reads the EDID in the current EEPROM and sends a video detection output signal to a display screen to be detected;
3) when the display screen is replaced, after the MCU receives a requirement that the PC host computer modifies screen parameters through the USB or the UART, the MCU outputs a control signal to connect the HDMI _ HP and the GND, and at the moment, the PC host computer considers that the screen is disconnected and closes the output of video signals; a GPIO of the single chip controls an output enabling pin of the HDMI-to-RGB chip, and RGB signal output is closed;
4) the MCU outputs a control signal to disconnect the I2C bus from the PC host, and is almost simultaneously reconnected to the I2C bus of the MCU, so that the EEPROM and the MCU are connected through the I2C bus;
5) the MCU analyzes new EDID information sent by the PC host and writes the EDID information into the EEPROM through an I2C bus;
6) the MCU outputs control signals again to ensure that the EEPROM is connected to the I2C of the HDMI of the PC host again;
7) the MCU outputs a control signal to reconnect the HDMI _ HP to the HDMI _5V0, and the PC host considers that a new screen is connected to the HDMI;
8) the PC host reads new EDID information and outputs video signals to a new display screen according to new video parameters; and one GPIO of the single chip controls an output enabling pin of the HDMI-to-RGB chip to restart RGB signal output.
As shown in FIG. 1, the switching detection device for the display screen comprises a PC host and a switching device, wherein one end of the switching device is connected with the PC host through an HDMI port, the other end of the switching device is connected with the display screen to be detected, and the detected display screen is detected by the PC host through the switching device. The switching device comprises an MCU, an EEPROM, an I2C bus switch, a reconnection switch, a voltage division circuit and an HDMI port. The input end of the I2C bus selector switch is connected with the I2C ports of the MCU and the EEPROM, and the output end is connected with the HDMI port through an I2C bus; one end of the reconnection switch is connected with a detection port HDMI _ HP of a display screen in the HDMI port, and the other end of the reconnection switch is connected with a power supply end or a GND end in the HDMI port; one end of the voltage division circuit is connected with the MCU, and the other end of the voltage division circuit is connected with a power supply end of the HDMI port; the switching device further comprises an HDMI-to-RGB chip, one end of the HDMI-to-RGB chip is connected with the PC host through an HDMI port, and the other end of the HDMI-to-RGB chip is connected with the detected display screen.
As shown in FIG. 2, the I2C bus switch includes two triode switch circuits including a triode Q1/Q2 and a relay K1/K2 connected with the collector thereof, and the control terminals SDA-SE and SCL-SE of the triode Q1/Q2 are both connected to the MCU and are respectively used for switching the SDA and SCL signal terminals of the I2C bus.
As shown in fig. 3, U1 is an EEPROM, ROM _ SDA of U1 is selectively connected to HDMI _ SDA or MCU _ SDA by transistors Q1 and K1 of a transistor switch circuit, and ROM _ SCL of U1 is selectively connected to HDMI _ SCL or MCU _ SCL by transistors Q2 and K2 of the transistor switch circuit.
As shown in fig. 4, the reconnection switch is a triode switch circuit, and includes a triode Q3 and a relay K3 connected to a collector thereof, wherein a control terminal of the triode Q3 is connected to the MCU, and is configured to disconnect and restore the connection between the detection port HDMI _ HP of the display screen and the power supply terminal or GND terminal of the HDMI port. The single chip microcomputer IO port is used for controlling and connecting the single chip microcomputer IO port to HDMI _5V0 or GND, and the host machine considers that the screen is unplugged or a new screen is connected.
As shown in fig. 5, the voltage divider circuit is composed of two serially connected voltage dividing resistors R1 and R2, the upper end of the voltage dividing resistor is connected to the power supply terminal HDMI _5V0 of the HDMI port, the lower end of the voltage dividing resistor is connected to GND, and the middle point HDMI5V _ TEST of the serially connected two resistors is connected to the IO port of the MCU, for detecting the access of the PC host.
Fig. 6 is a circuit diagram of the MCU, which includes various functional ports of the MCU corresponding to the connection pins.
As shown in fig. 7, J1 is a port diagram of HDMI, and includes, in addition to the aforementioned pin, an HDMI _ HP pin, which is a Hot-plug pin of HDMI, and the host detects the high/low level of the pin to determine whether a screen is connected to the HDMI.
The switching device is also connected with a PC host through a USB port. The MCU is communicated with the host through a USB or UART, and screen parameters are modified through upper computer software at any time when needed, so that the HDMI _ HP point screen is controlled, and the host outputs video signals according to new parameters.
Taking the devices in fig. 2-7 as an example, the method for detecting the switching of the display screen parameters in operation of the present invention comprises the following steps:
1) the switching device supplies power, is connected with a screen, the HDMI is connected with the HDMI interface of the host, the power-on default HDMI _ SDA is connected with the ROM _ SDA, the HDMI _ SCL is connected with the ROM _ SCL, and the HDMI _ HP is connected with the HDMI _5V 0; the host considers that the HDMI is connected with a screen, reads the EDID in the current EEPROM and sends an output signal.
2) At any moment, after the single chip receives a requirement that the upper computer modifies screen parameters through a USB or UART, the HP _ CTRL is pulled down, and the HDMI _ HP is connected with the GND; at this time, the HDMI host regards the screen as disconnected and turns off the video signal output.
3) The single chip microcomputer pulls down SDA _ SE and SCL _ SE, the ROM _ SDA and the ROM _ SCL are disconnected with the HDMI _ SDA and the HDMI _ SCL, and are connected to the MCU _ SDA and the MCU _ SCL again almost simultaneously, and therefore the EEPROM and the MCU are connected through I2C.
4) The single chip microcomputer analyzes new EDID information sent by the upper computer and writes the information into the EEPROM through I2C.
5) SDA _ SE and SCL _ SE are pulled up again, and the EEPROM is connected to I2C of the HDMI again.
6) Pulling up HP _ CTRL to reconnect HDMI _ HP to HDMI _5V0, the host recognizes that a new screen is connected to the HDMI interface.
7) The host computer reads the new EDID information and outputs video signals according to the new video parameters.
In the prior LCD detection device for generating RGB signals by using SOC or FPGA, each product needs to generate software which is usually the same and different, and the difference is only screen resolution and time sequence information. The code volume required to be maintained is greatly reduced, the working complexity and difficulty of debugging programmers are reduced, and the working efficiency is improved.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (6)
1. A method for switching and detecting parameters of a display screen by utilizing a HDMI (high-definition multimedia interface) of a PC (personal computer) host is characterized by comprising the following steps of:
1) setting a switching device, wherein the switching device comprises an MCU, an EEPROM, an I2C bus switch, a reconnection switch, a voltage division circuit, an HDMI-to-RGB chip and an HDMI port, one end of the switching device is connected with a detection PC host through the HDMI port, and the other end of the switching device is connected with a detected display screen and is used for switching the connection relation between the detected display screen and the detection PC host as well as the MCU in the bus switching device;
2) the switching device supplies power and is connected with a display screen to be detected, the I2C bus end of the HDMI port of the switching device is connected to the HDMI interface of the PC host, the power-on default PC host is connected with the EEPROM of the switching device, and the HDMI _ HP of the HDMI port of the switching device is connected with the HDMI _5V0 of the HDMI interface of the PC host; the HDMI _ HP pin is a Hot-plug pin of the HDMI, the PC host detects the high and low levels of the pin to judge whether a screen is connected to the HDMI, and at the moment, the PC host considers that the HDMI is connected with a screen, reads the EDID in the current EEPROM and sends a video detection output signal to a display screen to be detected;
3) when the display screen is replaced, after the MCU receives a requirement that the PC host computer modifies screen parameters through the USB or the UART, the MCU outputs a control signal to connect the HDMI _ HP and the GND, and at the moment, the PC host computer considers that the screen is disconnected and closes the output of video signals; a GPIO of the MCU controls an output enable pin of the HDMI-to-RGB chip to close RGB signal output;
4) the MCU outputs a control signal to disconnect the I2C bus from the PC host and reconnect to the I2C bus of the MCU, so that the EEPROM and the MCU are connected through the I2C bus;
5) the MCU analyzes new EDID information sent by the PC host and writes the EDID information into the EEPROM through an I2C bus;
6) the MCU outputs control signals again, so that the EEPROM is connected to the HDMI of the PC host again through the I2C bus;
7) the MCU outputs a control signal to reconnect the HDMI _ HP to the HDMI _5V0, and the PC host considers that a new screen is connected to the HDMI;
8) the PC host reads new EDID information and outputs video signals to a new display screen according to new video parameters; and one GPIO of the MCU controls an output enabling pin of the HDMI-to-RGB chip to restart RGB signal output.
2. The switching device for realizing the method for detecting the switching of the parameters of the display screen by utilizing the HDMI interface of the PC host according to claim 1 comprises an MCU, an EEPROM, an I2C bus switch, a reconnection switch, a voltage division circuit and an HDMI port; the input end of the I2C bus selector switch is connected with the I2C ports of the MCU and the EEPROM, and the output end is connected with the HDMI port through an I2C bus; one end of the reconnection switch is connected with a detection port HDMI _ HP of a display screen in the HDMI port, and the other end of the reconnection switch is connected with a power supply end or a GND end in the HDMI port; one end of the voltage division circuit is connected with the MCU, and the other end of the voltage division circuit is connected with a power supply end of the HDMI port;
the switching device further comprises an HDMI-to-RGB chip, one end of the HDMI-to-RGB chip is connected with the PC host through an HDMI port, and the other end of the HDMI-to-RGB chip is connected with the detected display screen.
3. The switching device according to claim 2, wherein the I2C bus switch comprises two triode switch circuits, and control terminals of the two triode switch circuits are connected to the MCU for switching SDA and SCL signal terminals of the I2C bus, respectively.
4. The switching device according to claim 2, wherein the reconnecting switch is a triode switch circuit, and a control terminal of the reconnecting switch is connected to the MCU for disconnecting and restoring the connection between the HDMI _ HP detection port of the display panel and the power terminal or the GND terminal of the HDMI port.
5. The switching device according to claim 2, wherein the voltage divider circuit comprises two serially connected voltage divider resistors, the upper end of the voltage divider resistor is connected to the power terminal of the HDMI port, the lower end of the voltage divider resistor is connected to ground, and the middle point of the two serially connected resistors is connected to the MCU for detecting the access of the PC host.
6. The switching device of claim 2, further connected to a PC host through a USB port.
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| CN116721614A (en) * | 2023-06-13 | 2023-09-08 | 广东高云半导体科技股份有限公司 | EDID information acquisition device, liquid crystal display screen detection device and method |
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