KR102721546B1 - Display module and image display apparatus including the same - Google Patents

Abstract

The present disclosure relates to a display module and an image display device including the same. According to one embodiment of the present disclosure, a display module includes: a plurality of pixels; a driver IC which generates a data signal for driving the plurality of pixels based on input first image data; and a pixel driver which drives the plurality of pixels based on the data signal output from the driver IC, wherein the driver IC outputs a first data signal corresponding to the first image data when the number of bits of the first image data is a preset reference number of bits, and when the number of bits of the first image data is less than the preset reference number of bits, assigns a value of the first image data to a value of second image data which is the reference number of bits based on a difference between the number of bits of the first image data and the reference number of bits, and outputs a second data signal corresponding to the second image data, and an interval between values of the second image data to which values of the first image data are assigned may increase from a low grayscale to a high grayscale. Various other embodiments are possible.

Description

DISPLAY MODULE AND IMAGE DISPLAY APPARATUS INCLUDING THE SAME

The present disclosure relates to a display module and an image display device including the same.

A display device is a device that has the function of displaying images that can be viewed by a user. Representative examples of display devices include a liquid crystal display (LCD) that uses liquid crystals and an organic light emitting diode (OLED) display that uses organic light emitting diodes.

Recently, research has been actively conducted on image display devices that display a large screen through multiple display panels arranged in a matrix form so that images can be provided to users who are far away from the image display device. In general, image display devices that display a large screen through multiple display panels display images based on image data received from an external device through an Ethernet cable, etc. At this time, the higher the image quality of the image output through the image display device, the more the data capacity transmitted from the external device to the image display device increases. In this case, in order to transmit a large amount of data, the cost of configuring a communication interface used for data transmission and a buffer memory used for data storage increases.

The present disclosure aims to solve the above-mentioned and other problems.

Another purpose is to provide a display module capable of outputting high-quality images despite limited performance with respect to transmission of image data, and an image display device including the same.

Another object is to provide a display module and a video display device including the same, which can additionally transmit other data related to the output of the video despite limited performance with respect to transmission of video data.

Another purpose is to provide a display module and a display device including the same capable of outputting a large screen through more display devices despite limited performance with respect to transmission of image data.

Another purpose is to provide a display module and an image display device including the same, which can reduce the cost of a configuration provided for transmission, storage, etc. of image data.

In order to achieve the above object, according to one embodiment of the present disclosure, a display module includes: a plurality of pixels; a driver IC which generates a data signal for driving the plurality of pixels based on input first image data; and a pixel driver which drives the plurality of pixels based on the data signal output from the driver IC, wherein the driver IC outputs a first data signal corresponding to the first image data when the number of bits of the first image data is a preset reference number of bits, and when the number of bits of the first image data is less than the preset reference number of bits, assigns a value of the first image data to a value of second image data which is the reference number of bits based on a difference between the number of bits of the first image data and the reference number of bits, and outputs a second data signal corresponding to the second image data, and an interval between values of the second image data to which values of the first image data are assigned may increase from a low grayscale to a high grayscale.

In order to achieve the above object, according to one embodiment of the present disclosure, an image display device includes: a communication interface for performing communication; a display module for outputting an image; and a control unit for transmitting at least a portion of image data received through the communication interface to the display module, wherein the display module includes: a plurality of pixels; a driver IC for generating a data signal for driving the plurality of pixels based on first image data received from the control unit; and a pixel driver for driving the plurality of pixels based on the data signal output from the driver IC, wherein the driver IC outputs a first data signal corresponding to the first image data when the number of bits of the first image data is a preset reference number of bits, and when the number of bits of the first image data is less than the preset reference number of bits, assigns a value of the first image data to a value of second image data, which is the reference number of bits, based on a difference between the number of bits of the first image data and the reference number of bits, and outputs a second data signal corresponding to the second image data, and an interval between values of the second image data to which values of the first image data are assigned may increase from a low grayscale to a high grayscale.

The effects of the display module according to the present disclosure and the image display device including the same are described as follows.

According to at least one embodiment of the present disclosure, high-quality images can be output despite limited performance with respect to transmission of image data.

According to at least one embodiment of the present disclosure, despite the limited performance with respect to transmission of image data, additionally other data related to the output of the image can be transmitted.

According to at least one embodiment of the present disclosure, a larger screen can be output through more image display devices despite limited performance with respect to transmission of image data.

According to at least one embodiment of the present disclosure, it is possible to reduce the cost of a configuration provided for transmission, storage, etc. of image data.

Further scope of the applicability of the present disclosure will become apparent from the detailed description below. However, since various changes and modifications within the spirit and scope of the present disclosure will become apparent to those skilled in the art, it should be understood that the detailed description and specific embodiments, such as preferred embodiments of the present disclosure, are given by way of example only.

FIGS. 1 and 2 are drawings illustrating an image display system according to one embodiment of the present disclosure.
FIGS. 3 to 5 are drawings for reference in explaining the configuration of an image display device according to one embodiment of the present disclosure.
FIG. 6 is a flowchart of an operation method of a display module according to one embodiment of the present disclosure.
FIGS. 7 to 11 are drawings for reference in explaining the operation of a display module according to one embodiment of the present disclosure.

Hereinafter, the present disclosure will be described in detail with reference to the drawings. In the drawings, in order to clearly and concisely describe the present disclosure, parts that are not related to the description are omitted, and the same drawing reference numerals are used for identical or extremely similar parts throughout the specification.

The suffixes "module" and "part" used for components in the following description are given simply for the convenience of writing this specification, and do not in themselves impart any particularly important meaning or role. Accordingly, the above "module" and "part" may be used interchangeably.

In this application, it should be understood that terms such as “comprises” or “have” are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Additionally, in this specification, terms such as first, second, etc. may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

FIGS. 1 and 2 are diagrams illustrating an image display system according to various embodiments of the present disclosure.

Hereinafter, the direction of the image display device (100) is defined based on the orthogonal coordinate system illustrated in FIGS. 1 and 2. In the orthogonal coordinate system, the x-axis direction can be defined as the left-right direction of the image display device (100). At this time, the direction toward +x with respect to the origin can mean the right direction, and the direction toward -x can mean the left direction. In addition, the y-axis direction can be defined as the front-back direction of the image display device (100). At this time, the direction toward +y with respect to the origin can mean the front direction, and the direction toward -y can mean the rear direction. In addition, the z-axis direction can be defined as the up-down direction of the image display device (100). At this time, the direction toward +z with respect to the origin can mean the upward direction, and the direction toward -y can mean the downward direction.

The video display system (1) may include a video wall (10) and/or an external device (20).

The video wall (10) may include a plurality of image display devices (100a-100d). The plurality of image display devices (100a-100d) may be arranged in a matrix form. The video wall (10) may output an image through the plurality of image display devices (100a-100d). For example, the video wall (10) may output one image through the plurality of image display devices (100a-100d). For example, the video wall (10) may output a first image through some of the plurality of image display devices (100a-100d) and output a second image through the remaining some.

A plurality of image display devices (100a-100d) can communicate with each other. For example, the plurality of image display devices (100a-100d) may each include a receiving connector (11a) and a transmitting connector (12a). At this time, the plurality of image display devices (100a-100d) can communicate with each other through a communication cable (15) connected to the receiving connector (11a) and/or the transmitting connector (12a). In the present disclosure, it is described as an example that the plurality of image display devices (100a-100d) communicate with each other using wired communication, but it is not limited thereto. For example, the plurality of image display devices (100a-100d) can communicate with each other using short-range wireless communication.

An external device (20) can transmit image data to the video wall (10). The external device (20) can communicate with at least one of the plurality of image display devices (100a-100d) included in the video wall (10). For example, the external device (20) can transmit image data to a first image display device (100a) of the plurality of image display devices (100a-100d) via a communication cable (25). At this time, the first image display device (100a) can transmit at least a portion of the image data received from the external device (20) to the second image display device (100b) via the communication cable (15). The second image display device (100b) to the fourth image display devices (100d) can sequentially transmit at least a portion of the image data to each other via the communication cable (15).

A plurality of image display devices (100a-100d) can output images based on image data received from an external device (20). For example, the external device (20) can transmit image data for the entire screen to the first image display device (100a). At this time, the first image display device (100a) can output a part of the screen based on image data for a part of the screen corresponding to the first position where the first image display device (100a) is placed among the image data for the entire screen.

Referring to FIG. 3, the image display device (100) may include a plurality of display modules (130). The image display device (100) may output a screen corresponding to image data received from an external device (20) through a plurality of display modules (130).

The display module (130) may include a plurality of pixels (300). The plurality of pixels (300) may be arranged in a matrix form. The pixel (300) may include a light-emitting diode (LED). For example, the pixel (300) may be implemented as an organic light-emitting diode (OLED) including an organic light-emitting layer, an inorganic light-emitting diode (ILED) including an inorganic light-emitting layer, etc. The pixel (300) may have RGB sub-pixels. Alternatively, the pixel (300) may have RGBW sub-pixels. When the pixel (300) includes RGB sub-pixels, a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode may be arranged in the pixel (300). The pixel (300) may emit red light, green light, and/or blue light through the sub-pixels.

Referring to FIG. 4, the image display device (100) may include a communication interface (110), memory (120), a display module (130), a power supply (140), and/or a control unit (150).

The communication interface (110) can perform communication using a wired method and/or a wireless method. The communication interface (110) can include a communication module for wired communication. For example, the communication interface (110) can include an Ethernet terminal. The communication interface (110) can include a communication module for wireless communication. For example, the communication interface (110) can include a communication module for short-range communication such as Wi-Fi (Wireless Fidelity), Bluetooth, Bluetooth Low Energy (BLE), Zigbee, and NFC (Near Field Communication).

The memory (120) can store programs for each signal processing and control within the control unit (150). The memory (120) can store application programs designed for the purpose of performing various tasks that can be processed by the control unit (170). At this time, the memory (120) can selectively provide some of the stored application programs upon request from the control unit (170). The programs stored in the memory (120) are not particularly limited as long as they can be executed by the control unit (170).

The memory (120) can store image data. For example, the memory (120) can perform a function for temporary storage of image data received through the communication interface (110).

The memory (120) may include at least one of volatile memory (e.g., DRAM, SRAM, SDRAM, etc.) or non-volatile memory (e.g., flash memory, hard disk drive (HDD), solid-state drive (SSD), etc.).

In this disclosure, it is described as an example that the memory (120) is provided separately from the control unit (150), but is not limited thereto, and the memory (120) may be included within the control unit (170).

The display module (130) may include a display panel having a plurality of pixels (300). The plurality of pixels (300) may be connected to a plurality of gate lines (GL) and data lines (DL) that are arranged to intersect in a matrix form. A plurality of thin film transistors (TFTs) may be arranged at the intersections of the plurality of gate lines (GL) and data lines (DL).

The display module (130) can generate a driving signal for a plurality of pixels (300) based on image data transmitted from the control unit (150). The display module (130) can include a timing controller, a gate driver, and/or a data driver. According to one embodiment, the timing controller can be included in the control unit (150). The gate driver and the data driver can supply signals to the gate line (GL) and the data line (DL), respectively. At this time, the pixel (300) arranged at the intersection of the gate line (GL) and the data line (DL) can operate according to the signal supplied to the gate line (GL) and the data line (DL).

The power supply unit (140) can supply power to the entire image display device (100). For example, the power supply unit (140) can supply power to a display module (130) that outputs an image, a control unit (150) that can be implemented in the form of a system on chip (SOC), etc.

The power supply unit (140) may include a power terminal for supplying power. For example, a plurality of image display devices (100a-100d) may be connected to each other through a power cable connected to the power terminal. At this time, the plurality of image display devices (100a-100d) may transmit power to each other through the power terminal.

The control unit (150) may include at least one processor. The control unit (150) may control the overall operation of the image display device (100) using the processor. For example, the processor may be a dedicated device such as an ASIC or another hardware-based processor.

The control unit (150) can determine image data for a screen output through the display module (130) from image data received from an external device (20) through the communication interface (110). For example, the control unit (150) can receive image data for the entire screen through the communication interface (110). At this time, the control unit (150) can extract image data for a portion of the screen output through the display module (130) from among the image data for the entire screen.

Referring to FIG. 5, the control unit (150) can transmit image data to the display module (130) through a preset interface (510). The preset interface (510) can be implemented as an interface of a serial communication method such as SPI (Serial Peripheral Interface) or I2C (Inter-Integrated Circuit).

When the image display device (100) includes a plurality of display modules (130), the control unit (150) can transmit image data to each of the plurality of display modules (130). For example, the control unit (150) can transmit a first portion of the image data received from the external device (20) to the first display module and transmit a second portion to the second display module.

The display module (130) may include a driver IC (131) and a pixel driver (133).

The driver IC (131) can receive image data from the control unit (150). The driver IC (131) can generate a signal for driving the pixel (300) based on the image data transmitted from the control unit (150). The driver IC (131) can be a data driver. The signal generated by the driver IC (131) can be named as a data voltage, a data signal, etc.

The driver IC (131) may include a digital-to-analog converter. For example, the driver IC (131) may receive image data and a timing control signal from the control unit (150). At this time, the driver IC (131) may generate an analog signal corresponding to the image data in accordance with the timing control signal and supply the same to the data line (DL).

The pixel driver (133) can drive the pixel (300) based on a signal supplied from the driver IC (131). The pixel driver (133) can include a light-emitting diode (LED) constituting the pixel (300), a driving TFT that generates a current flowing through the light-emitting diode (LED) in response to a gate-to-source voltage, at least one switch TFT that sets a gate-to-source voltage of the driving TFT, a capacitor that maintains a gate-to-source voltage of the driving TFT, and the like.

According to one embodiment, the driver IC (131) can process image data based on the bit width of the image data transmitted from the control unit (150). The driver IC (131) can generate a signal corresponding to the processed image data based on the bit width. In this regard, a description will be made with reference to FIG. 6.

FIG. 6 is a flowchart of an operation method of a display module according to one embodiment of the present disclosure.

Referring to FIG. 6, the display module (130) can check the number of bits (hereinafter, input bit number) of image data transmitted to the display module (130) in operation S610. As the number of bits of image data supplied from the external device (20) increases, a high-quality image can be output through the display module (130).

The display module (130) can determine, in operation S620, whether the number of input bits is less than a preset reference bit number. Here, the reference bit number can correspond to the number of bits of image data corresponding to a signal generated from the driver IC (131). In the present disclosure, the reference bit number is 16 bits as an example, but is not limited thereto.

The display module (130), in operation S630, can process image data transmitted from the control unit (150) based on the bit number difference between the input bit number and the reference bit number when the number of input bits is less than the reference bit number. For example, the driver IC (131), when the number of input bits is 13 bits, can process 13-bit image data based on the bit number difference of 3 bits between the reference bit number of 16 bits and the input bit number of 13 bits. At this time, the image data processed based on the bit number difference may be image data of the reference bit number of 16 bits. Hereinafter, the image data transmitted from the control unit (150) to the display module (130) will be referred to as first image data, and the image data processed based on the bit number difference will be referred to as second image data.

The display module (130) can generate a signal corresponding to image data transmitted from the control unit (150) in operation S640. For example, when the number of input bits is 16 bits, the driver IC (131) can generate a signal corresponding to 16 bits of first image data transmitted from the control unit (150). For example, when the number of input bits is 13 bits, the driver IC (131) can generate a signal corresponding to 16 bits of second image data processed based on the bit number difference.

Referring to FIG. 7, conventionally, when the number of input bits is less than the reference number of bits, the first image data can be processed based on a bit shift according to the bit number difference. That is, when the number of input bits is less than the reference number of bits, a predetermined value corresponding to the bit number difference can be multiplied to the value of the first image data. Here, the value of the image data can correspond to a grayscale value. For example, when the number of bits is 3 bits, the value of the first image data can be multiplied by 8, which is a value corresponding to the number of bits difference of 3 bits. Meanwhile, when the number of bits is 4 bits, the value of the first image data can be multiplied by 16, which is a value corresponding to the number of bits difference of 4 bits. In this case, when the first image data is processed based on the bit shift, the value of the first image data can be simply assigned to the value of the second image data according to the predetermined value corresponding to the number of bits difference.

In addition, when the values of the first image data are simply assigned to the values of the second image data according to the difference in the number of bits, the intervals between the values of the first image data and the intervals between the values of the second image data may correspond to each other according to the difference in the number of bits. For example, 896, which is the interval between 128 and 1024 of the values of the first image data, may correspond to 1/8 of 7168, which is the interval between 1024 and 8192 of the values of the second image data to which the values of the first image data are respectively assigned. In addition, 1024, which is the interval between 1024 and 2048 of the values of the first image data, may correspond to 1/8 of 8192, which is the interval between 8192 and 16384 of the values of the second image data to which the values of the first image data are respectively assigned. That is, when the values of the first image data are simply assigned to the values of the second image data according to the difference in the number of bits, the interval between the values of the second image data can be constant according to a predetermined value corresponding to the difference in the number of bits.

In this way, when the first image data is processed according to the conventional method, a signal corresponding to the second image data to which the first image data is simply allocated is generated, so even though the driver IC (131) can process 16-bit image data, the image display device (100) can output only a screen corresponding to 13-bit image data as a result.

Meanwhile, referring to FIG. 8, according to one embodiment of the present disclosure, the driver IC (131) can process the first image data based on a lookup table related to gamma correction when the number of input bits is less than the number of reference bits. In the present disclosure, the gamma value related to the gamma correction is described as 2.2 as an example, but is not limited thereto.

The driver IC (131) can assign values of the first image data to values of the second image data according to a look-up table related to gamma correction. For example, a plurality of sections (811-818) composed of values of the first image data can respectively correspond to a plurality of sections (821-828) composed of values of the second image data. At this time, a value belonging to the first section (811) of the first image data can be assigned to a value belonging to the second section (821) of the second image data, and a value belonging to the third section (812) of the first image data can be assigned to a value belonging to the fourth section (822) of the second image data. In the present disclosure, it is described as an example that a value of the image data belongs to one of eight sections, but is not limited thereto.

According to one embodiment of the present disclosure, the correspondence between the sizes of the plurality of sections (811-818) corresponding to the first image data and the sizes of the plurality of sections (821-828) corresponding to the second image data may be different.

As illustrated in FIG. 7, according to the conventional method, the size of each of the plurality of sections (721-725) corresponding to the second image data may be eight times the size of each of the plurality of sections (711-715) corresponding to the first image data. That is, when the value of the first image data is simply assigned to the value of the second image data according to the bit number difference of 3 bits, the correspondence between the sizes of the plurality of sections (711-715) corresponding to the first image data and the sizes of the plurality of sections (721-725) corresponding to the second image data may be constant at eight times corresponding to the bit number difference of 3 bits.

On the other hand, according to one embodiment of the present disclosure as illustrated in FIG. 8, the correspondence relationship between the size of the first section (811) and the size of the second section (821) may be 1 time, the correspondence relationship between the size of the third section (812) and the size of the fourth section (822) may be 2 times, and the correspondence relationship between the size of the fifth section (813) and the size of the sixth section (823) may be 4 times. In other words, the correspondence relationship between the sizes of the plurality of sections (811-818) corresponding to the first image data and the sizes of the plurality of sections (821-828) corresponding to the second image data may increase from low grayscale to high grayscale.

In addition, when the values of the first image data are assigned to the values of the second image data according to the look-up table related to gamma correction, the interval between the values of the second image data may increase from a low grayscale to a high grayscale. For example, the interval between the values of the second image data may gradually increase from a low grayscale to a high grayscale to 1, 2, 4, 8, 10, 12, 13, and 14 according to the sizes of the plurality of sections (821-828). Meanwhile, the interval between the values of the second image data included in any one of the plurality of sections (821-828) may be constant.

The driver IC (131) can process the first image data based on a look-up table corresponding to a bit number difference among a plurality of look-up tables. The plurality of look-up tables related to gamma correction may be different depending on the bit number difference. For example, the larger the bit number difference, the larger the gap between the values of the second image data processed according to the look-up table.

Figures 9 to 11 are graphs illustrating the relationship between the gradation representing the brightness of an image and the values of second image data.

Referring to FIG. 9, the second graph (910) in which the first image data is simply assigned to the second image data according to the difference in the number of bits may be significantly different from the first graph (900) corresponding to the gamma value of 2.2. In contrast, the third graph (920) in which the first image data is assigned to the second image data according to the look-up table related to gamma correction may be close to the first graph (900) corresponding to the gamma value of 2.2.

In particular, referring to FIGS. 10 and 11, when a gamma value of 2.2 is considered, a high bit precision is required to express a grayscale value in a low grayscale compared to a high grayscale. At this time, if all values below the decimal point are expressed through image data having a low bit number, the bit precision may be very low in the low grayscale, making it difficult for the display module (130) to sufficiently express the low grayscale. In contrast, if the difference in bit numbers is used to allocate low-bit image data to high-bit image data based on a look-up table that considers gamma correction, a corresponding effect can be obtained when the high-bit image data is transmitted to the display module (130).

In addition, when the bandwidth used for data transmission is secured by transmitting low-bit image data, the extra bandwidth can be utilized for additional transmission of other data related to the output of the image, such as data related to compensation for dead pixels, data related to compensation for uniformity, etc. In addition, since the data capacity corresponding to one image display device (100) is reduced, the number of image display devices (100) arranged on the video wall (10) can be expanded.

As described above, according to at least one embodiment of the present disclosure, high-quality images can be output despite limited performance with respect to transmission of image data.

Additionally, according to at least one embodiment of the present disclosure, despite the limited performance with respect to transmission of image data, it is possible to additionally transmit other data related to the output of the image.

Additionally, according to at least one embodiment of the present disclosure, a larger screen can be output through more image display devices (100) despite limited performance with respect to transmission of image data.

In addition, according to at least one embodiment of the present disclosure, the cost for a configuration provided for transmission, storage, etc. of image data can be reduced.

The attached drawings are only intended to facilitate understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present disclosure.

Meanwhile, the operating method of the image display device of the present disclosure can be implemented as a processor-readable code on a processor-readable recording medium provided in the image display device. The processor-readable recording medium includes all types of recording devices that store data that can be read by the processor. Examples of the processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc., and also includes those implemented in the form of a carrier wave, such as transmission via the Internet. In addition, the processor-readable recording medium can be distributed to computer systems connected to a network, so that the processor-readable code can be stored and executed in a distributed manner.

In addition, although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present disclosure pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be individually understood from the technical idea or prospect of the present disclosure.

Claims (12)

multiple pixels;
A driver IC that generates a data signal for driving the plurality of pixels based on input data; and
It includes a pixel driver that drives the plurality of pixels based on the data signal output from the driver IC,
The above driver IC,
Compare the number of bits of the first image data included in the input data with the preset reference number of bits,
When the number of bits of the first image data is a preset reference number of bits, a first data signal corresponding to the first image data is output,
If the number of bits of the first image data is less than a preset reference number of bits, the value of the first image data is assigned to the value of the second image data, which is the reference number of bits, based on the difference between the number of bits of the first image data and the reference number of bits.
Based on other data related to the output of the image included in the input data corresponding to the difference between the number of bits of the first image data and the number of reference bits, a second data signal corresponding to the second image data is output,
A display module, characterized in that the interval between the values of the second image data to which the values of the first image data are assigned increases from low to high grayscale. In the first paragraph,
The above driver IC,
A display module characterized in that the value of the first image data is assigned to the value of the second image data based on a look-up table corresponding to the difference between the number of bits of the first image data and the number of reference bits among a plurality of look-up tables. In the second paragraph,
A display module, characterized in that the plurality of look-up tables correspond to predetermined gamma values related to gamma correction. In the first paragraph,
The values of the above second image data are each included in a corresponding section among a plurality of sections,
The interval between values included in any one of the above multiple intervals is constant,
A display module characterized in that the intervals between values included in a first interval among the above multiple intervals and the intervals between values included in a second interval are different from each other. In the first paragraph,
A display module characterized in that the driver IC receives the first image data through a serial communication interface. A communication interface that performs communication;
A display module for outputting images; and
A control unit for transmitting at least a portion of image data received through the communication interface to the display module,
The above display module,
multiple pixels;
A driver IC that generates a data signal for driving the plurality of pixels based on data received from the control unit; and
It includes a pixel driver that drives the plurality of pixels based on the data signal output from the driver IC,
The above driver IC,
Compare the number of bits of the first image data included in the data received from the above control unit with the preset reference number of bits,
When the number of bits of the first image data is a preset reference number of bits, a first data signal corresponding to the first image data is output,
If the number of bits of the first image data is less than a preset reference number of bits, the value of the first image data is assigned to the value of the second image data, which is the reference number of bits, based on the difference between the number of bits of the first image data and the reference number of bits.
Based on other data related to the output of the image included in the data received from the control unit corresponding to the difference between the number of bits of the first image data and the number of reference bits, a second data signal corresponding to the second image data is output,
An image display device, characterized in that the interval between the values of the second image data to which the values of the first image data are assigned increases from low to high grayscale. In Article 6,
The above video display device is one of multiple video display devices forming a video wall,
The above control unit,
An image display device characterized in that a portion of the image data corresponding to the image display device is extracted as the first image data. In Article 6,
The above driver IC,
An image display device characterized in that the value of the first image data is assigned to the value of the second image data based on a look-up table corresponding to the difference between the number of bits of the first image data and the number of reference bits among a plurality of look-up tables. In Article 8,
An image display device, characterized in that the plurality of look-up tables correspond to predetermined gamma values related to gamma correction. In Article 6,
The values of the above second image data are each included in a corresponding section among a plurality of sections,
The interval between values included in any one of the above multiple intervals is constant,
An image display device characterized in that the intervals between values included in a first interval among the above multiple intervals and the intervals between values included in a second interval are different from each other. In Article 6,
An image display device, characterized in that the driver IC receives the first image data through a serial communication interface. In Article 6,
The above communication interface includes an Ethernet terminal,
An image display device characterized in that the control unit receives the image data via an Ethernet cable connected to an Ethernet terminal.

Images