Inspection device and inspection system

Abstract

The present disclosure relates to an inspection device for performing inspection on a display device by using an HDMI port, and an operating method thereof. A display device may comprise an HDMI port including a DDC line. The display device may comprise an interface chip configured to determine an inspection mode from among a UART mode or a DDC mode, on the basis of a mode selection signal or a software-based mode selection function, and set an input / output for the DDC line according to the determined inspection mode. The mode selection signal may be applied during a PBA process inspection using a PBA as a device to be inspected, and the software-based mode selection function may be applied during a main line process inspection using a finished product as a device to be inspected. The interface chip may comprise a GPIO pin and a mode selection circuit configured to output the mode selection signal according to whether there is a physical contact from the outside with respect to the GPIO pin.

Description

Inspection device and inspection system

[0001] The present disclosure relates to an inspection device and an inspection system that perform an inspection of a display device using an HDMI port.

[0002] Electronic devices undergo a defect inspection procedure during the production process before being shipped as products. For example, process inspections are conducted on key components or the finished product before the electronic device is manufactured into a finished product.

[0003] Display devices such as televisions or monitors require more precise inspection during the production process, as even small defects at the pixel level can have a fatal impact on the quality of the finished product.

[0004] The information described above may be provided as related art for the purpose of aiding understanding of this document. None of the foregoing is to be claimed as prior art related to this document, nor is it to be used to determine prior art.

[0005] In various embodiments of the present disclosure, an inspection device and an inspection system can be provided that can selectively perform inspection according to heterogeneous communication interface specifications using an HDMI port.

[0006] According to one embodiment, the display device may include a high-definition multimedia interface (HDMI) port including a display data channel (DDC) line. The display device may include an interface chip configured to determine one of a universal asynchronous receiver / transmitter (UART) mode or a DDC mode as a test mode based on a mode selection signal or a software-based mode selection function, and to set input / output for the DDC line according to the determined test mode. The mode selection signal may be applied during a PBA process test in which a printed board assembly (PBA) is the device to be tested, and the software-based mode selection function may be applied during a main line process test in which a finished product is the device to be tested. The interface chip may include a general-purpose input / output (GPIO) pin and a mode selection circuit configured to output the mode selection signal depending on whether there is a physical contact from the outside to the GPIO pin.

[0007] According to one embodiment, the inspection system may include an inspection device, a device to be inspected, and an interface conversion jig configured to interface data between the inspection device and the device to be inspected. During process inspection of a printed board assembly (PBA) to be inspected, the inspection mode to use a display data channel (DDC) line included in the HDMI port of the device to be inspected may be operated such that the inspection mode is determined by hardware logic to be either a universal asynchronous receiver / transmitter (UART) mode or a DDC mode. During process inspection of a finished product to be inspected, the inspection mode to use the DDC line may be operated such that it is set software-wise through a factory option.

[0008] In relation to the description of the drawings, the same or similar reference numerals may be used for identical or similar components.

[0009] FIG. 1 is a structural diagram of an inspection system according to one embodiment.

[0010] FIG. 2 is a structural diagram illustrating the operation of setting interface specifications for process inspection in a device subject to process inspection according to one embodiment.

[0011] FIG. 3 is a diagram illustrating a mode selection circuit for physically selecting the interface specifications of a PBA, which is an object to be inspected, in an inspection system according to one embodiment.

[0012] FIG. 4 is a diagram illustrating a procedure for process inspection in an inspection system according to one embodiment.

[0013] FIG. 5a or FIG. 5b is a drawing for explaining a procedure for PBA process inspection in an inspection system according to one embodiment.

[0014] FIG. 6a, FIG. 6b, or FIG. 6c is a drawing for explaining a procedure for main line process inspection in an inspection system according to one embodiment.

[0015] Hereinafter, embodiments of the present disclosure are described in detail with reference to the drawings so that those skilled in the art can easily practice them. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein. In relation to the description of the drawings, the same or similar reference numerals may be used for identical or similar components. Furthermore, in the drawings and related descriptions, descriptions of well-known functions and configurations may be omitted for clarity and brevity.

[0016] FIG. 1 is a structural diagram of an inspection system according to one embodiment (e.g., inspection system (1) of FIG. 1).

[0017] In this document, it is assumed that a universal serial bus (USB) port and / or an RS232C (recommended standard 232C) port (or a UART (universal asynchronous receiver / transmitter) port) is not used as a port for connecting peripheral devices to input / output data (hereinafter referred to as 'interface port'), but rather an HDMI (high-definition multimedia interface) port is used to conduct an inspection in the production process prior to product shipment (hereinafter referred to as 'process inspection').

[0018] For example, process inspection may include PBA process inspection and / or main line process inspection. PBA process inspection may be a process inspection conducted with the PBA as the inspection target. Main line process inspection may be a process inspection conducted with the finished product (e.g., a display device such as a monitor or television) as the inspection target. For the finished product to be subjected to main line process inspection, a PBA that has completed PBA process inspection may be used.

[0019] In this document, it is assumed that an inspection system (1) performs PBA process inspection and / or main line process inspection using a DDC (I2C) line provided in an HDMI port. The DDC (I2C) line may correspond to at least one pin included among the multiple pins provided in the HDMI port or a conductive line extending from said pin. For example, the DDC line may be an SDA (serial data) line (e.g., SDA line (250) in FIG. 2) and / or an SCL (serial clock) line (e.g., SCL line (260) in FIG. 2). For convenience of explanation below, the SDA line and / or SCL line may be collectively referred to as the DDC line or the I2C line. Thus, a process inspection method utilizing the DDC (or I2C) line provided in the HDMI port can not only enhance the process operation and / or convenience of the producer but also help with productivity (e.g., automation).

[0020] Referring to FIG. 1, the inspection system (1) may include a server (10), an inspection device (20), an interface conversion jig (30), an inspection target device (40), or a monitor (50). The inspection target device (40) may be either a PBA (60) or a finished product (70). In this document, the inspection target device (40) may be used to indicate either the PBA (60) or the finished product (70), or to indicate both the PBA (60) and the finished product (70) together. The PBA (60) may be an inspection target for PBA inspection. For example, the inspection system (1) may conduct a PBA process inspection with the PBA (60) mounted on an inspection jig (not shown) as the inspection target. The finished product (70) may be an inspection target for main line inspection. For example, the inspection system (1) may conduct a main line process inspection with the finished product (70) as the inspection target. The finished product (70) may include a PBA (60) that has completed the PBA process inspection. The finished product (70) may be a display device, for example, such as a monitor or a television.

[0021] The server (10) can store and / or manage information regarding the profile of the device to be inspected (40) for PBA process inspection and / or main line process inspection of the device to be inspected (40). The server (10) can provide information for process inspection of the device to be inspected (40) (e.g., EDID (extended display identification data), microcomputer version, factory option, software version, setting language, display serial number) to the device to be inspected (20) in response to a request from the device to be inspected (20).

[0022] According to one example, in a test system (1), a test device (20) can establish a physical link (e.g., a communication channel) with a device to be tested (40) through an interface conversion jig (30). The test device (20) may be connected to the interface conversion jig (30) by a UART cable (80) that supports a UART communication method (or UART standard) in, for example, UART mode. To this end, the test device (20) or the interface conversion jig (30) may be provided with UART ports (21, 31) for connecting the UART cable (80). The device to be tested (40) may be connected to the interface conversion jig (30) by an HDMI cable (90) that supports an I2C communication method (or I2C standard) in, for example, DDC mode. To this end, the test device (20) or the interface conversion jig (30) may be provided with HDMI ports (33, 41) for connecting the HDMI cable (90). The inspection target device (40) may include a D-SUB port (43), although it is not substantially used during process inspection.

[0023] The interface conversion jig (30) can transmit and receive signals and / or data (hereinafter referred to as 'UART data') with the inspection device (20) based on the UART communication method, or transmit and receive signals and / or data (hereinafter referred to as 'I2C data') with the inspection target device (40) based on the I2C communication method. For example, the interface conversion jig (30) can convert UART data according to the UART standard received from the inspection device (20) into I2C data according to the I2C standard and transmit it to the inspection target device (40). For example, the interface conversion jig (30) can convert I2C data received from the inspection target device (40) into UART data and transmit it to the inspection device (20).

[0024] According to one example, the inspection target device (40) may have a UART mode based on the UART standard activated in an inspection mode or an operation mode (hereinafter referred to as 'operation mode') while the process inspection is substantially in progress. The operation mode can control, for example, whether the I2C line of the HDMI port (41) is used in UART mode or in DDC mode. For example, the operation mode is set to DDC mode before the process inspection is initiated, in which the factory option of the inspection target device (40) is initialized, but the operation mode can be switched to UART mode after the process inspection is initiated. The method of switching the operation mode may differ depending on whether the process inspection to be performed on the inspection target device (40) is a PBA process inspection or a main line process inspection.

[0025] For example, during PBA process inspection, the operation mode can be set by a physical method using a general-purpose input / output (GPIO) pin (63) provided on the PBA (60), which is the device (40) to be inspected. The GPIO pin (63) may be, for example, one of the terminals provided on the interface chip (200) mounted on the PBA (60). A mode selection circuit (e.g., the mode selection circuit (300) of FIG. 3) for detecting the potential may be provided on the GPIO pin (63) provided on the interface chip (200). A detailed explanation regarding this will be described later with reference to FIG. 3. For example, a test pin (e.g., the test pin (310a or 310b) of FIG. 3) provided on the inspection system (1) may be electrically connected to the GPIO pin (63) and grounded (AGND) through a pull-up resistor (R). A predetermined pull-up voltage supplied through the test pin (310) can raise the potential difference across the pull-up resistor (R) to a high level (5V). The operating mode of the PBA (60) can be switched from DDC mode (or D-SUB mode) to UART mode (or HDMI mode) due to the high level (5V) potential difference distributed across the pull-up resistor (R). For example, the test pin provided in the test system (1) (e.g., the test pin (310a or 310b) of FIG. 3) can be disconnected from the GPIO pin (63) to stop the supply of the pull-up voltage. In this case, the potential difference across the pull-up resistor (R) can drop to a substantially low level (0V). The operating mode of the PBA (60) can be switched from UART mode (or HDMI mode) to DDC mode (or D-SUB mode) due to a low level (0V) potential difference distributed to the pull-up resistor (R).

[0026] For example, at the point when the PBA process inspection is completed and the main line process inspection is to be performed, the inspection device (20) may request the PBA (60) to set the software flag option in the factory menu to UART mode. In response to the setting request from the inspection device (20), the PBA (60) may record a setting value instructing the activation of UART mode in a register (e.g., register (213) in FIG. 2). The setting value recorded in the register (213) allows the UART mode to remain activated in the finished product (70) during the main line process inspection. At the point when the main line process inspection must be completed, the inspection device (20) may request the finished product (70) to initialize the settings regarding the factory mode. The finished product (70) may record a setting value instructing the activation of DDC mode in a register (e.g., register (213) in FIG. 2) in response to the setting request from the inspection device (20). Thus, the finished product (70) can be shipped with the factory option initialized.

[0027] As described above, the operation of setting or switching the operation mode of the inspection target device (40) to either UART mode or DDC mode can be substantially performed by the interface chip (200) mounted on the PBA (60) during PBA process inspection or by the interface chip (200) included in the finished product (70) during main line process inspection. The interface chip (200) may be a communication chip provided to perform overall operations for transmitting and receiving signals and / or data with an external device connected through, for example, a predetermined interface port (e.g., HDMI port (41)).

[0028] For example, the inspection system (1) can output the inspection result of the PBA (60), which is the inspection target device (40), through a monitor (50) directly connected to the PBA (60) during the PBA process inspection. For example, the inspection system (1) can output the inspection result of the finished product (70), which is the inspection target device (40), through the finished product (70)'s own display during the main line process inspection.

[0029] FIG. 2 is a structural diagram for explaining the operation of setting interface specifications for process inspection in a device to be inspected (e.g., device to be inspected (40) of FIG. 1) to be inspected according to one embodiment.

[0030] Referring to FIG. 2, the process inspection may include a PBA process inspection in which a PBA (e.g., PBA (60) of FIG. 1) mounted on an inspection jig is the inspection target device (40), and a main line process inspection in which a finished product (e.g., a display device such as a monitor or television) (e.g., finished product (70) of FIG. 1) is the inspection target device (40). The inspection target device (40) may include an interface chip (e.g., interface chip (200) of FIG. 1) mounted on the PBA (60). The interface chip (200) may include a multiplexer (210) for selecting an interface standard (e.g., UART or I2C). The multiplexer (210) may include a switch (211) or a multiplexer switch register (213) (hereinafter referred to as 'register (213)'). The switch (211) may provide a switching operation for switching the operation mode. The multiplexer (210) can be connected to an interface conversion jig (e.g., the interface conversion jig (30) of FIG. 1) by, for example, the SDA line (250) and the SCL line (260).

[0031] According to one example, during a PBA process inspection, the switch (211) can perform a switching operation corresponding to an operation mode determined between UART mode (or FANET mode) or DDC mode (or I2C mode) based on a physical setting (e.g., External Resistance GPIO setting) (Setting #1 (270)). For example, a GPIO pin provided on the interface chip (200) (e.g., GPIO pin (63) in FIG. 1) can be used to determine whether to supply a pull-up voltage. A high-level pull-up voltage can control the switch (211) so that the I2C line of the HDMI port (e.g., HDMI port (41) in FIG. 1) is used as a signal line according to UART mode (or FANET mode). A low-level pull-up voltage can control the switch (211) so that the I2C line of the HDMI port (e.g., HDMI port (41) in FIG. 1) is used as a signal line according to DDC mode (or I2C mode).

[0032] According to one example, during a main line process inspection, the switch (211) cannot perform a switching operation based on a physical setting (e.g., External Resistance GPIO setting) (Setting #2 (280)). This is because the inspection target for the main line process inspection is a finished product (70). In other words, the GPIO pin (63) to be used for the physical setting is not exposed externally, making it difficult to form an electrical connection by the inspection pin. Therefore, during a main line process inspection, the switch (211) can perform a switching operation to determine one of the operating modes, either UART mode (or FANET mode) or DDC mode (or I2C mode), based on a setting by software. For example, the value of a register (213) inside the interface chip (200) can be set by utilizing a factory-specific menu (e.g., software factory mode control function) supported by the finished product (70), which is the inspection target device (40). The setting value of the register (213) can control the I2C line of the HDMI port (e.g., HDMI port (41) of FIG. 1) to be used as a signal line according to one of the interface modes, UART mode (or FANET mode) or DDC mode (or I2C mode). For example, the value of the register (213) can be set to a specific value in response to a setting request from a test device (e.g., test device (20) of FIG. 1). For example, during a main line process test, the interface chip (200) can write the value '0x04' to the register (213) to activate a specific UART channel, change a specific bit regarding DDC in the control register from '1' to '0', and change a specific bit regarding I2C address in the control register from '1' to '0'. By doing so, the interface chip (200) can provide operation in UART mode.

[0033] For example, during a main line process inspection, the interface chip (200) can write a value other than '0x04' to the register (213) to activate a specific I2C channel, thereby changing a specific bit regarding DDC in the control register from '0' to '1' and changing a specific bit regarding I2C address in the control register from '0' to '1'. By doing so, the interface chip (200) can provide operation in DDC mode.

[0034] The operation described above as an example may be applied only during the main line process inspection. Once the main line process inspection is completed, the interface chip (200) may perform a factory reset to initialize the corresponding factory mode setting to a value for switching to DDC mode.

[0035] According to one embodiment, the multiplexer (210) can change the settings for inputting / outputting source data according to an interface mode (e.g., UART mode (or FANET mode) or DDC mode (or I2C mode)) corresponding to the switching operation of the switch (211). For example, the multiplexer (210) can change the settings for inputting / outputting UART data (240) according to the UART mode (or FANET mode) in which the HDMI port is activated, in response to the switching operation of the switch (211) during PBA process inspection.

[0036] FIG. 3 is a diagram illustrating a mode selection circuit (300) for physically selecting the interface specifications of a PBA (e.g., PBA (60) of FIG. 1) which is an object to be inspected in an inspection system (e.g., inspection system (1) of FIG. 1) according to one embodiment.

[0037] Referring to FIG. 3, the mode selection circuit (300) may include a GPIO pin (e.g., GPIO pin (63) of FIG. 1) or a pull-up resistor (R). As an example, the GPIO pin (63) may be a terminal provided on a chip (e.g., interface chip (200) of FIG. 1) mounted on the PBA (60). The GPIO pin (63) may be used as an electrical contact to which a test pin (310a or 310b) provided in the inspection system (1) is electrically connected during the PBA process inspection process. The GPIO pin (63) may be grounded (AGND) through the pull-up resistor (R). The test pin (310) provided in the inspection system (1) may be movable in a predetermined direction (e.g., up and down). The inspection system (1) may supply a predetermined pull-up voltage through the test pin (310). For example, the reading pin (310) can be moved in an upward direction (a) or a downward direction (b).

[0038] According to one example, the test pin (310b) in a state moved to the lower direction (b) may be electrically connected to the GPIO pin (63) at its end. In this case, a pull-up voltage may be supplied from the outside through the test pin (310b) electrically connected to the GPIO pin (63). The pull-up voltage supplied from the test pin (310b) to the GPIO pin (63) may raise the potential difference at the pull-up resistor (R) to a high level (5V). The high level potential difference may be provided to the interface chip (200) as setting #1 (e.g., setting #1 (270) in FIG. 2) to determine the interface specification. Setting #1 (270) based on the high level potential difference may cause the DDC mode to be disabled and the UART mode to be enabled in the interface chip (200).

[0039] According to one example, the test pin (310a) in the state moved to the upper direction (a) may be disconnected from the GPIO pin (63). In this case, the test pin (310a) in the state moved to the upper direction (a) can no longer supply pull-up voltage to the GPIO pin (63). When the supply of pull-up voltage through the GPIO pin (63) is cut off, the potential difference across the pull-up resistor (R) may drop to a low level (0V). The low level potential difference may be provided to the interface chip (200) as setting #1 (270) for determining the interface specification. Setting #1 (270) based on the low level potential difference may cause the UART mode to be disabled and the DDC mode to be enabled in the interface chip (200).

[0040] FIG. 4 is a diagram illustrating a procedure for process inspection in an inspection system according to one embodiment (e.g., inspection system (1) of FIG. 1).

[0041] In FIG. 4, the inspection system (1) is configured such that the inspection operation of the inspection target device (40) is performed in UART mode while the process inspection is actually being performed, and the operation mode of the inspection target device (40) is set to DDC mode, which is the factory initialization state, before the process inspection is initiated or when the process inspection is completed.

[0042] Referring to FIG. 4, the inspection system (1) can perform a process inspection on a device to be inspected (e.g., the device to be inspected (40) of FIG. 1). According to one example, the inspection system (1) can sequentially perform a PBA process inspection or a main line process inspection on the device to be inspected (40). In operation 410, the inspection system (1) can perform a PBA process inspection with a PBA (e.g., the PBA (60) of FIG. 1) as the inspection target. The PBA (60), which is the device to be inspected (40) to be inspected, can be used to produce a finished product (e.g., the finished product (70) of FIG. 1). In operation 420, the inspection system (1) can perform a main line process inspection with a finished product (70) as the inspection target. When performing the main line process inspection, the finished product (70), which is the device to be inspected (40), may include a PBA (60) for which the PBA process inspection has been completed. For example, the finished product (70) may be a television, or It can be a display device such as a monitor.

[0043] According to one example, the inspection system (1) may perform a PBA process inspection on the inspection target device (40) in operation 410. The inspection target device (40) to perform the PBA process inspection may be, for example, a PBA (60) mounted on an inspection jig. The PBA (60) mounted on the inspection jig may be connected to a display (e.g., the monitor (50) of FIG. 1) for checking inspection results. The PBA (60) may include an HDMI port (e.g., the HDMI port (41) of FIG. 1) and / or a D-SUB port (or I2C port) (e.g., the D-SUB port (43) of FIG. 1) as interface ports.

[0044] For PBA process inspection, the inspection system (1) may provide a communication interface between an inspection device (e.g., inspection device (20) of FIG. 1) and a PBA (60) mounted on the jig, which is the inspection target device (40), through an interface conversion jig (e.g., interface conversion jig (30) of FIG. 1). For example, the HDMI port (41) of the PBA (60) may be connected to the HDMI port (e.g., HDMI port (33) of FIG. 1) of the interface conversion jig (30) by an HDMI cable (e.g., HDMI cable (90) of FIG. 1). The UART port (e.g., UART port (31) of FIG. 1) of the interface conversion jig (30) may be connected to the UART port (e.g., UART port (21) of FIG. 1) of the inspection device (20) by a UART cable (e.g., UART cable (80) of FIG. 1).

[0045] According to one example, the inspection system (1) can set the operating mode for PBA inspection by a physical method using a GPIO pin (63) provided in the PBA (60) during PBA process inspection. For example, a mode selection signal provided by a mode selection circuit (e.g., mode selection circuit (300) of FIG. 3) provided in the GPIO pin (63) of the interface chip (200) mounted in the PBA (60) can be considered for setting the operating mode for PBA inspection. For example, a test pin (e.g., test pin (310a or 310b) of FIG. 3) provided in the inspection system (1) can be electrically connected to the GPIO pin (63) and grounded (AGND) through a pull-up resistor (R) constituting the mode selection circuit (300). A predetermined pull-up voltage supplied through the test pin (310) can raise the potential difference at the pull-up resistor (R) to a high level (5V). Due to a high level (5V) potential difference distributed across the pull-up resistor (R), the mode selection signal may request the operation mode of the PBA (60) to switch from DDC mode (or D-SUB mode) to UART mode (or HDMI mode). For example, if a test pin provided in the test system (1) (e.g., the test pin (310a or 310b) of FIG. 3) is disconnected from the GPIO pin (63) and the supply of pull-up voltage is interrupted, the potential difference across the pull-up resistor (R) may drop to a substantially low level (0V). In this case, the operation mode of the PBA (60) may switch from UART mode (or HDMI mode) to DDC mode (or D-SUB mode) due to a mode selection signal corresponding to the low level (0V) potential difference distributed across the pull-up resistor (R).

[0046] According to one example, the inspection system (1) may perform a main line process inspection on the device to be inspected (40) in operation 420. The device to be inspected (40) to be inspected may be, for example, a finished product (70) including a PBA (60) for which a PBA inspection has been completed. The finished product (70) may include its own display. The finished product (70) may include an HDMI port (e.g., HDMI port (41) in FIG. 1) and / or a D-SUB port (or I2C port) (e.g., D-SUB port (43) in FIG. 1) as an interface port.

[0047] For main line process inspection, the inspection system (1) may provide a communication interface between an inspection device (e.g., inspection device (20) of FIG. 1) and a finished product (70), which is a device to be inspected (40), through an interface conversion jig (e.g., interface conversion jig (30) of FIG. 1). For example, the HDMI port (41) of the finished product (70) may be connected to the HDMI port (e.g., HDMI port (33) of FIG. 1) of the interface conversion jig (30) by an HDMI cable (e.g., HDMI cable (90) of FIG. 1). The UART port (e.g., UART port (31) of FIG. 1) of the interface conversion jig (30) may be connected to the UART port (e.g., UART port (21) of FIG. 1) of the inspection device (20) by a UART cable (e.g., UART cable (80) of FIG. 1).

[0048] According to one example, at the point when the PBA process inspection is completed and the main line process inspection is to be performed, the inspection system (1) causes the PBA (60) to set the software flag option in the factory menu to UART mode. For example, the PBA (60) may record a setting value instructing the activation of UART mode in a register (e.g., register (213) in FIG. 2). The setting value recorded in the register (213) ensures that the UART mode remains activated in the finished product (70) during the main line process inspection. At the point when the main line process inspection must be completed, the inspection system (1) may reset the settings regarding the factory mode of the finished product (70). The finished product (70) may reset the settings regarding the factory mode and record a setting value instructing the activation of DDC mode in a register (e.g., register (213) in FIG. 2).

[0049] FIG. 5a or FIG. 5b is a drawing for explaining a procedure for PBA process inspection in an inspection system according to one embodiment (e.g., inspection system (1) of FIG. 1).

[0050] Referring to FIG. 5a or FIG. 5b, when a PBA process inspection is initiated, the inspection system (1) can, in operation 511, connect a physical link (e.g., a communication channel) between an inspection device (e.g., an inspection device (20) of FIG. 1) and a device to be inspected (e.g., a device to be inspected (40) of FIG. 1) through an interface conversion jig (e.g., an interface conversion jig (30) of FIG. 1). At this time, the device to be inspected (40) may be a PBA (e.g., a PBA (60) of FIG. 1) mounted on the inspection jig. According to one example, the inspection device (20) may connect a link with the interface conversion jig (30) based on a UART communication method, and the device to be inspected (40) may connect a link with the interface conversion jig (30) based on an I2C communication method.

[0051] The inspection system (1) may allow the PBA (60) to download and install firmware for PBA process inspection. According to one example, the inspection device (20) may command the PBA (60) to download the firmware in operation 513. When the PBA (60) commands the PBA to download the firmware, the PBA (60) may download and execute the firmware in operation 515. For example, the PBA (60) may electrically connect the test pin (TP) of the inspection system (1) to an electrical contact provided to receive data to form a data path, and download the firmware through the formed data path. After executing the downloaded firmware, the PBA (60) may proceed with the PBA process inspection. In operation 517, the PBA (60) may transmit a firmware download completion response to the inspection device (20) to indicate that the firmware has been downloaded and installed.

[0052] The inspection system (1) can supply power to the PBA (60) for PBA process inspection. According to one example, the inspection device (20) can command power supply to the PBA (60) in operation 519. When power supply is commanded from the inspection device (20), the PBA (60) can receive power for inspection through a power pin provided in the inspection system (1) in operation 521. When power supply is initiated, the PBA (60) can activate a DDC mode that supports an I2C communication method (e.g., I2C channel activation). After activating the DDC mode, the PBA (60) can transmit a power supply completion response to the inspection device (20) in operation 523 to indicate that power supply has been initiated.

[0053] The operator electrically connects the TP of the inspection system (1) to a GPIO pin (e.g., GPIO pin (63) in FIG. 1) provided in the PBA (60) where power is being supplied, thereby forming a path through which a pull-up voltage is supplied, and the pull-up voltage can be supplied through the formed path. When the PBA (60) identifies that a switch in the communication method is requested when the pull-up voltage is supplied, it can disable the DDC mode and enable the UART mode that supports the UART communication method. In operation 527, the PBA (60) can transmit a UART mode switch notification to the inspection device (20) to indicate that the switch to the UART mode is completed.

[0054] The inspection system (1) can perform an operation to record extended display identification data (EDID) on the PBA (60). An EDID is a type of data structure. An EDID may contain information about a display device, such as a monitor. For example, an EDID about a display device to be inspected may be transmitted to an inspection device (20). The inspection device (20) may identify the device to be inspected (40) based on the EDID. For example, the EDID may include information about the manufacturer, product type, EDID version, type of phosphor or filter, timing, screen size, brightness, or pixels of the device to be inspected (40) connected for inspection.

[0055] According to one example, the inspection device (20) may, in operation 529, request the server (e.g., the server (10) of FIG. 1) to provide an EDID for PBA process inspection. In operation 531, the server (10) may transmit the EDID in response to the request from the inspection device (20). In operation 533, the inspection device (20) may command the PBA (60) to record the EDID along with the EDID provided by the server (10). In operation 535, the PBA (60) may store the EDID received from the inspection device (20) at a designated recording location. The PBA (60) may transmit the address corresponding to the location where the EDID is recorded to the inspection device (20).

[0056] The inspection system (1) can change the source type in the PBA (60) to HDMI. According to one example, the inspection device (20) can command the PBA (60) to change the source to HDMI in operation 537. When the inspection device (20) commands a change of source to HDMI, the PBA (60) can change the source to HDMI in operation 539 and output an HDMI screen through a connected inspection monitor (e.g., the monitor (50) of FIG. 1) using the changed HDMI source. For example, the HDMI screen output through the inspection monitor (50) may be a screen that can check brightness and / or color information (RGB). In operation 541, the PBA (60) can transmit an HDMI screen inspection result to the inspection device (20) to indicate the result of inspecting the HDMI screen.

[0057] The inspection system (1) can perform an operation to verify the EDID recorded in the PBA (60). According to one example, the inspection device (20) can command the PBA (60) to verify the EDID in operation 543. When the inspection device (20) commands the verification of the EDID, the PBA (60) can read the EDID it stores in operation 545 and transmit it to the inspection device (20). The inspection device (20) can perform a verification for authentication of the EDID received from the PBA (60) in operation 547.

[0058] The inspection system (1) can perform an operation to check the microcomputer version. According to one example, the inspection device (20) may, in operation 549, request the server (10) to provide the microcomputer version according to the PBA process inspection. The server (10) may, in operation 551, transmit the microcomputer version in response to the request from the inspection device (20). In operation 553, the inspection device (20) may command the PBA (60) to check the microcomputer version along with the microcomputer version provided by the server (10). When the inspection device (20) commands the microcomputer version check, the PBA (60) may, in operation 555, obtain the microcomputer version it has stored and transmit it to the inspection device (20). In operation 557, the inspection device (20) may perform a check on the microcomputer version received from the PBA (60).

[0059] The inspection system (1) can perform an operation to ensure that the UART mode remains active even when inspecting a finished product (e.g., the finished product (70) of FIG. 1) after the PBA process inspection is completed. According to one example, the inspection device (20) can transmit a UART setting command to the PBA (600) in operation 559. For example, the inspection device (20) can command the PBA (60) to set the software flag option in the factory menu to UART mode. In operation 561, the PBA (60) can record a setting value in a register (e.g., register (213) in FIG. 2) that indicates the activation of UART mode in response to the UART setting command. The setting value recorded in the register (213) allows the UART mode to remain active in the finished product (70) during main line process inspection. In operation 563, the PBA (60) can transmit the setting value recorded in the register (213) to the inspection device (20) to activate UART mode. In operation 565, the inspection device (20) can verify whether the UART mode has been properly set in the PBA (60) based on the setting value transmitted from the PBA (60). The inspection device (20) can report the inspection results of the PBA process inspection performed in operation 567 to the server (10).

[0060] FIG. 6a, FIG. 6b, or FIG. 6c is a drawing for explaining a procedure for main line process inspection in an inspection system according to one embodiment (e.g., inspection system (1) of FIG. 1).

[0061] Referring to FIG. 6a, FIG. 6b, or FIG. 6c, a PBA (e.g., PBA (60) of FIG. 1) for which a PBA process inspection (e.g., PBA process inspection (410) of FIG. 4) has been completed can be used to produce a finished product (e.g., finished product (70) of FIG. 1). A main line process inspection (e.g., main line process inspection (420) of FIG. 4) can be performed on a finished product (70) containing a PBA (60) for which a PBA process inspection has been completed.

[0062] When a main line process inspection is initiated, the inspection system (1) can establish a physical link (e.g., a communication channel) between an inspection device (e.g., an inspection device (20) of FIG. 1) and a device to be inspected (e.g., a device to be inspected (40) of FIG. 1) through an interface conversion jig (e.g., an interface conversion jig (30) of FIG. 1). At this time, the device to be inspected (40) may be a finished product (70) including a PBA (60) for which the PBA process inspection has been completed. According to one example, the inspection device (20) may establish a link with the interface conversion jig (30) based on a UART communication method, and the device to be inspected (40) may establish a link with the interface conversion jig (30) based on an I2C communication method.

[0063] The inspection system (1) can supply power to a finished product (70) for main line process inspection. According to one example, the inspection device (20) can command power supply to the finished product (70). When power supply is commanded from the inspection device (20), the finished product (70) can start power supply for inspection in operation 603. To this end, a power cable for power supply to the finished product (70) may be connected to a specific power source. The finished product (70) may have a setting value for activating UART mode stored in a register (e.g., register (213) in FIG. 2) through a software flag option included in the factory menu during PBA process inspection. Therefore, when power is supplied, the finished product (70) can read the setting value recorded in the register (213) in operation 603 and activate UART mode. The finished product (70) can transmit a power supply completion response to the inspection device (20) to indicate that the power supply is complete and the main line process inspection can be performed in operation 605.

[0064] The inspection system (1) can perform an operation to prevent the finished product (70) being inspected from switching to a standby mode (e.g., power management signaling, DPMS) because there is no video signal to be processed for a certain period of time. According to one example, the inspection device (20) can transmit a DPMS off command to the finished product (70) in operation 607. The DPMS off command may be a command requesting the deactivation of the function that switches to a standby mode (e.g., power management signaling, DPMS) because there is no video signal to be processed for a certain period of time. When the finished product (70) receives the DPMS off command from the inspection device (60), it can disable the corresponding function setting so that the DPMS function does not operate in operation 609. That is, the finished product (70) can set the DPMS off. In operation 611, the finished product (70) can transmit a DPMS off completion response to the inspection device (60) indicating that the DPMS function has been deactivated.

[0065] The inspection system (1) can perform an operation to record a factory option in the PBA (60). According to one example, the inspection device (20) may request the server (10) to provide a factory option according to the main inspection in operation 613. The server (10) may transmit the factory option in response to the request from the inspection device (20) in operation 615. The inspection device (20) may command the PBA (60) to set the factory option together with the factory option provided by the server (10) in operation 617. When the factory option setting is commanded from the inspection device (20), the PBA (60) may set the factory option in operation 619. The PBA (60) may transmit a factory option setting completion response to the inspection device (20) in operation 621 to indicate that the factory option setting is completed.

[0066] The inspection system (1) can perform an operation to record a serial number in the PBA (60). According to one example, the inspection device (20) may request the server (10) to issue a serial number according to the main inspection in operation 623. The server (10) may issue a serial number in response to the request from the inspection device (20) in operation 625 and transmit the issued serial number to the inspection device (20). The inspection device (20) may transmit the serial number provided by the server (10) to the PBA (60) in operation 627. The PBA (60) may store the serial number transmitted from the inspection device (20) in the main flash memory in operation 629. The PBA (60) may transmit a serial number storage completion response to the inspection device (20) in operation 631 to indicate that the storage of the serial number has been completed.

[0067] In the inspection system (1), in operation 633, the inspection system (1) can perform an operation to inspect the soft version. According to one example, the inspection device (20) can request the soft version according to the main inspection from the server (10). The server (10) can transmit the soft version to the inspection device (20) in response to the request from the inspection device (20). The inspection device (20) can transmit the soft version provided by the server (10) to the PBA (60). The PBA (60) can verify whether the soft version transmitted from the inspection device (20) matches its own soft version. After the finished product (70) undergoes soft version verification, it can transmit a soft version inspection completion response to the inspection device (20) to indicate that the soft version inspection has been completed.

[0068] The inspection system (1) can perform an operation to verify the model code for the finished product (70). According to one example, the inspection device (20) may, in operation 635, request the server (10) to provide the model code for the finished product (70), which is the product subject to inspection according to the main line process inspection. In operation 637, the server (10) may, in response to the request from the inspection device (20), transmit the model code for the finished product (70), which is the product subject to inspection, to the inspection device (20). In operation 639, the inspection device (20) may command the finished product (70) to record the model code together with the model code provided by the server (10). When the recording of the model code is commanded from the inspection device (20), the finished product (70) may, in operation 641, record the model code received from the inspection device (20) in its internal memory. The finished product (70) can transmit a model code recording completion response to the inspection device (20) to indicate that the model code recording is completed in operation 643.

[0069] The inspection system (1) can perform an inspection of the power saving function of the finished product (70). The power saving function of the finished product (70) may be a function that controls the amount of power consumption for each preset power saving stage. For example, the inspection system (1) can determine whether the power saving function is defective by measuring the amount of power consumed for each preset power saving stage of the finished product (70). According to one example, the inspection device (20) can transmit a power saving function inspection command to the finished product (70) for each preset power saving stage in operation 645. The finished product (70) can perform a power saving inspection by changing the settings to an operating environment corresponding to the power saving stage in response to the command transmitted from the inspection device (20) in operation 647. The finished product (70) can output the results of the power saving inspection performed in the corresponding power saving stage through a display. The inspector can determine whether there is an operational defect in the corresponding power saving stage through the inspection results displayed on the display. The finished product (70) can transmit the inspection result for the corresponding power saving step to the inspection device (20) in operation 649. The inspection device (20) can determine whether the power saving function of the finished product (70) is defective based on the inspection result transmitted from the finished product (70) in operation 651. The above-described operations 645 to 649 can be performed sequentially for all power saving steps provided by the power saving function.

[0070] The inspection system (1) can perform a setting operation for the basic language in the finished product (70). According to one example, the inspection device (20) may, in operation 653, request the server (10) to provide a setting language (e.g., Korean (KR)) to be set for the finished product (70), which is the product subject to inspection according to the main line process inspection. In operation 655, the server (10) may, in response to the request from the inspection device (20), transmit the language to be set for the finished product (70), which is the product subject to inspection, to the inspection device (20). In operation 657, the inspection device (20) may set the setting language provided by the server (10) to its own language. In operation 661, the finished product (70) may transmit a language setting completion response to the inspection device (20) to indicate that the language setting has been completed.

[0071] The inspection system (1) can perform an operation to verify the EDID recorded in the PBA (60). According to one example, the inspection device (20) may request the server (10) to provide the EDID for PBA process inspection in operation 663. The server (10) may transmit the EDID in response to the request from the inspection device (20) in operation 665. The inspection device (20) may command the PBA (60) to verify the EDID in operation 667. When the inspection device (20) commands the verification of the EDID, the PBA (60) may read the EDID it has stored in operation 669 and transmit it to the inspection device (20). In operation 671, the inspection device (20) may perform a verification of the EDID based on whether the EDID received from the PBA (60) matches the EDID provided by the server (10).

[0072] The inspection system (1) can perform a verification operation for the basic language in the finished product (70). According to one example, the inspection device (20) can command the finished product (70) to verify the set language in operation 673. When the inspection device (20) commands verification of the set language, the finished product (70) can transmit a language verification response to the inspection device (20) to indicate the language it has set in operation 675. In operation 677, the inspection device (20) can verify whether the set language transmitted from the finished product (70) matches the language it had requested to set.

[0073] The inspection system (1) can perform an operation to check whether the factory option is properly set on the finished product (70). According to one example, the inspection device (20) can transmit a factory option verification command requesting factory option verification to the finished product (70) in operation 679. When the factory option verification is commanded from the inspection device (20), the finished product (70) can transmit a factory option response to the inspection device (20) to indicate the factory option it has set in operation 681. In operation 683, the inspection device (20) can check whether the factory option transmitted from the finished product (70) matches the factory option it had requested to set.

[0074] The inspection system (1) can perform an inspection of the function keys of the finished product (70) in operation 685. The function keys of the finished product (70) may correspond to keys that can be used to set the functions provided by the product or for operation. According to one example, the inspection device (20) can transmit a function inspection command to the finished product (70) to inspect whether the corresponding function operates normally for each function key provided in the finished product (70). The finished product (70) can perform an operation by activating the corresponding function in response to the function inspection command transmitted from the inspection device (20). The finished product (70) can output the result of performing the corresponding function inspection through a display. The inspector can determine whether there is a malfunction corresponding to the function through the inspection result displayed on the display. The finished product (70) can transmit the inspection result of the corresponding function to the inspection device (20). The inspection device (20) can determine whether there is a malfunction of the corresponding function in the finished product (70) based on the inspection result transmitted from the finished product (70). The above-described operation 685 can be performed sequentially for all functions supported by the finished product (70).

[0075] The inspection system (1) can perform an operation to check whether the serial number is properly set on the finished product (70). According to one example, the inspection device (20) can, in operation 687, transmit a serial number request to the finished product (70) that commands verification of the serial number. Upon receiving the serial number request from the inspection device (20), the finished product (70) can, in operation 689, transmit a serial number verification response to the inspection device (20) to indicate the serial number it has set. In operation 691, the inspection device (20) can verify whether the serial number transmitted from the finished product (70) matches the serial number it had requested to set.

[0076] The inspection system (1) can perform a factory reset operation to initialize the factory mode settings for the finished product (70). According to one example, the inspection device (20) can transmit a factory reset command requesting a factory reset to the finished product (70) in operation 693. Upon receiving the factory reset command from the inspection device (20), the finished product (70) can perform a factory reset operation to reset the setting values ​​in factory mode in operation 695. For example, the finished product (70) can disable the UART mode and enable the DDC mode through the factory reset operation. In operation 695, the finished product (70) can transmit a factory reset completion response to the inspection device (20) to indicate that the factory reset is complete. In operation 697, the inspection device (20) can report the main inspection result to the server (10) according to the factory reset completion response transmitted from the finished product (70).

[0077] According to one example, the display device may include an HDMI (high-definition multimedia interface) port (41) including a DDC (display data channel) line. The display device may include an interface chip (200) configured to determine one of a UART (universal asynchronous receiver / transmitter) mode or a DDC mode as a test mode based on a mode selection signal or a software-based mode selection function, and to set input / output for the DDC line according to the determined test mode. The mode selection signal is applied during a PBA process inspection in which a PBA (printed board assembly) (60) is the device to be inspected (40), and the software-based mode selection function may be applied during a main line process inspection in which a finished product (70) is the device to be inspected (40). The interface chip (200) may include a general-purpose input / output (GPIO) pin (63) and a mode selection circuit (300) configured to output a mode selection signal depending on whether there is a physical contact from the outside to the GPIO pin (63).

[0078] According to one example, the HDMI port (41) may be configured to be connected to an interface conversion jig (30) based on a UART interface—wherein the interface conversion jig (30) is connected to a test device (20)—by means of an HDMI cable (90).

[0079] According to one example, the input / output settings for the above DDC line can be configured to support I2C (inter-integrated circuit).

[0080] According to one example, the interface chip (200) may include a register (213) configured to set an identifier indicating one of the UART mode or the DDC mode based on the software-based mode selection function.

[0081] According to one example, a multiplexer (210) may be included that is configured to set input / output corresponding to the test mode by activating a UART channel according to the UART mode or an I2C channel according to the DDC mode based on the identifier set in the register (213).

[0082] According to one example, the interface chip (200) may be configured to change from the UART mode to the DDC mode in response to the completion of the PBA process inspection.

[0083] According to one example, the mode selection circuit (300) may include the GPIO pin (63); and a pull-up resistor (R) provided between the GPIO pin (63) and ground.

[0084] According to one example, the mode selection circuit (300) may be configured to output the potential difference at the pull-up resistor (R) as the mode selection signal due to the pull-up voltage supplied through the GPIO pin (63).

[0085] According to one example, the software-based mode selection function of the interface chip (200) may operate such that the UART mode is selected during the main line process inspection, and the DDC mode is selected when the main line process inspection is completed.

[0086] According to one example, the interface chip (200) may operate such that, during the PBA process inspection, the operating mode is changed from the DDC mode to the UART mode based on the mode selection signal, and during the main line process inspection, the UART mode is maintained based on the software-based mode selection function.

[0087] According to one example, the interface chip (200) may operate to initialize the operation mode to the DDC mode based on the software-based mode selection function when the main line process inspection is completed.

[0088] According to one example, the interface chip (200) may be configured to perform a factory reset operation to initialize the factory mode settings in response to the completion of the main line process inspection.

[0089] According to one example, the inspection system (1) may include an inspection device (20). The inspection system (1) may include a device to be inspected (40). The inspection system (1) may include an interface conversion jig (30) configured to interface data between the inspection device (20) and the device to be inspected (40). When performing a process inspection of a PBA (printed board assembly) (60) which is the device to be inspected (40), the inspection mode to use the DDC (display data channel) line included in the HDMI (high-definition multimedia interface) port (41) of the device to be inspected (40) may be operated such that the hardware logic determines either a UART (universal asynchronous receiver / transmitter) mode or a DDC mode. When performing a process inspection of a finished product (70) which is the device to be inspected (40), the inspection mode to use the DDC line (250, 260) may be operated such that it is set software-wise through a factory option.

[0090] According to one example, the HDMI port (41) may be configured to be connected to the interface conversion jig (30) based on a UART interface—wherein the interface conversion jig (30) is connected to a test device (20)—by means of an HDMI cable (90).

[0091] According to one example, the input / output settings for the DDC lines (250, 260) may be settings to support I2C (inter-integrated circuit).

[0092] According to one example, the hardware logic that operates to determine the inspection mode during process inspection of the PBA (60) may include a general-purpose input / output (GPIO) pin (63) and a pull-up resistor (R) provided between the GPIO pin (63) and ground.

[0093] According to one example, the inspection target device (40) may include an interface chip (200) configured such that an inspection mode for process inspection of the finished product (70) is set by a flag value included in the factory option, and said flag value is set in response to a request from the inspection device (20).

[0094] According to one example, the interface chip (200) may operate such that when the process inspection of the finished product (70) is completed, the inspection mode is set to the DDC mode by initializing the factory option.

[0095] The embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of said items unless the relevant context clearly indicates otherwise. In this document, phrases such as "A or B," "at least one of A and B," "at least one of A or B," "A, B or C," "at least one of A, B and C," and "at least one of A, B, or C" may each include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used simply to distinguish said components from other said components and do not limit said components in any other aspect (e.g., importance or order). Where any (e.g., 1st) component is referred to as “coupled” or “connected” to another (e.g., 2nd) component, with or without the terms “functionally” or “communicationly,” it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0096] As used in one embodiment of this document, the term “module” may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit, for example. A module may be a component formed integrally, or a minimum unit of said component or a part thereof that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0097] One embodiment of the present document may be implemented as software comprising one or more instructions stored in a storage medium (e.g., memory (230)) readable by a machine (e.g., electronic device (200)). For example, a processor (e.g., processor (210)) of the machine (e.g., electronic device (200)) may call at least one of the one or more instructions stored from the storage medium and execute it. This enables the machine to be operated to perform at least one function according to the at least one called instruction. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. The storage medium readable by the machine may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' simply means that the storage medium is a tangible device and does not contain a signal (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily.

[0098] According to one embodiment, the method according to one embodiment disclosed herein may be provided by being included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0099] According to one embodiment, each component (e.g., module or program) of the components described above may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to one embodiment, one or more of the components or operations among the aforementioned components may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the multiple components in the same or similar manner as those performed by the corresponding component among the multiple components prior to integration. According to one embodiment, operations performed by the module, program, or other components may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

Claims

1. In a display device, HDMI (high-definition multimedia interface) port (41) including DDC (display data channel) lines (250, 260); and It includes an interface chip (200) configured to determine one of a universal asynchronous receiver / transmitter (UART) mode or a DDC mode as a test mode based on a mode selection signal or a software-based mode selection function, and to set input / output for the DDC lines (250, 260) according to the determined test mode. The above mode selection signal is applied during a PBA process inspection in which a PBA (printed board assembly) (60) is the inspection target device (40), and The above software-based mode selection function is applied during a main line process inspection in which the finished product (70) is the inspection target device (40), and The above interface chip (200) includes a general-purpose input / output (GPIO) pin (63) and a mode selection circuit (300) configured to output a mode selection signal depending on whether there is a physical contact from the outside to the GPIO pin (63). A display device including 2. In Paragraph 1, A display device configured such that the above HDMI port (41) is connected to an interface conversion jig (30) based on a UART interface—wherein the interface conversion jig (30) is connected to a test device (20)—and to an HDMI cable (90).

3. In Paragraph 1 or 2, A display device in which the input / output settings for the above DDC lines (250, 260) are settings for supporting I2C (inter-integrated circuit).

4. In any one of paragraphs 1 through 3, The above interface chip (200) is, A register (213) configured to set an identifier indicating one of the UART mode or the DDC mode based on the software-based mode selection function; and A multiplexer (210) configured to set input / output corresponding to the test mode by activating a UART channel according to the UART mode or an I2C channel according to the DDC mode based on the identifier set in the register (213). A display device including 5. In any one of paragraphs 1 through 4, A display device configured such that the interface chip (200) changes from the UART mode to the DDC mode in response to the completion of the PBA process inspection.

6. In any one of paragraphs 1 through 4, The above mode selection circuit (300) is, The above GPIO pin (63); and A pull-up resistor (R) provided between the above GPIO pin (63) and ground Includes, A display device configured such that the mode selection circuit (300) outputs the potential difference at the pull-up resistor (R) as the mode selection signal due to the pull-up voltage supplied through the GPIO pin (63).

7. In any one of paragraphs 1 through 6, A display device in which the above interface chip (200) operates a software-based mode selection function such that the UART mode is selected during the main line process inspection and the DDC mode is selected when the main line process inspection is completed.

8. In any one of paragraphs 1 through 6, A display device in which the interface chip (200) operates to change the operating mode from the DDC mode to the UART mode based on the mode selection signal during the PBA process inspection, and maintain the UART mode based on the software-based mode selection function during the main line process inspection.

9. In Paragraph 8, A display device in which the interface chip (200) operates to initialize the operating mode to the DDC mode based on the software-based mode selection function when the main line process inspection is completed.

10. In Paragraph 8, A display device configured such that the interface chip (200) performs a factory reset operation to initialize the factory mode settings in response to the completion of the main line process inspection.

11. In the inspection system (1), Inspection device (20); Device to be inspected (40); and It includes an interface conversion jig (30) configured to interface data between the inspection device (20) and the inspection target device (40), and When performing a process inspection on the PBA (printed board assembly) (60) which is the inspection target device (40), the inspection mode to use the DDC (display data channel) line included in the HDMI (high-definition multimedia interface) port (41) of the inspection target device (40) is operated such that it is determined by hardware logic to be either a UART (universal asynchronous receiver / transmitter) mode or a DDC mode. An inspection system (1) that operates such that, when performing a process inspection on a finished product (70) which is the inspection target device (40), the inspection mode to use the DDC line (250, 260) is set software-wise through a factory option.

12. In Paragraph 11, The above HDMI port (41) is configured to be connected to the above interface conversion jig (30) based on a UART interface—wherein the above interface conversion jig (30) is connected to the above inspection device (20)—by means of an HDMI cable (90), in an inspection system (1).

13. In Paragraph 11 or 12, The input / output settings for the above DDC lines (250, 260) are settings for supporting I2C (inter-integrated circuit), in a test system (1).

14. In any one of paragraphs 11 through 13, When performing a process inspection on the above PBA (60), the hardware logic that operates to determine the inspection mode is, General-purpose input / output (GPIO) pin (63); and A pull-up resistor (R) provided between the above GPIO pin (63) and ground Inspection system (1) including 15. In any one of paragraphs 11 through 14, The above inspection target device (40) is, An interface chip (200) configured such that an inspection mode for process inspection of the above-mentioned finished product (70) is set by a flag value included in the factory option, and the flag value is set in response to a request from the inspection device (20). Includes, An inspection system (1) in which the above interface chip (200) operates such that when the process inspection of the above finished product (70) is completed, the inspection mode is set to the above DDC mode by the initialization of the above factory option.

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