KR20180067884A - Display panel and tiled display device including the same - Google Patents

Abstract

An embodiment of the present invention relates to a display panel and a tiled display device including the same, capable of preventing the non-uniformity of brightness or the non-uniformity of a color at a boundary part between adjacent sub panels. The embodiment of the present invention stores an initial brightness value, measures a brightness value changed according to the passage of time, calculates a brightness gain by comparing two values, and corrects a lookup table of a conversion unit by using the brightness gain, thereby maintaining the brightness of the sub panels to be identical to the initial brightness value. Accordingly, the tiled display device according to the embodiment of the present invention can prevent the non-uniformity of the brightness or the non-uniformity of the color at the boundary part between the adjacent sub pixels.

Description

Technical Field [0001] The present invention relates to a display panel and a tiled display device including the same,

One example of the present invention relates to a display panel and a tiled display device including the same.

2. Description of the Related Art In recent years, the importance of display devices has been increasing with the development of multimedia. Various types of flat panel display devices such as a liquid crystal display device, a plasma display device, and an organic light emitting display device have been commercialized in response to this. Among the flat panel display devices, liquid crystal display devices and organic light emitting display devices are excellent in display characteristics such as a notebook computer, a television, a tablet computer, a monitor, a smart phone, a portable display device, and a portable information device due to their excellent characteristics such as thinness, light weight, .

In addition, there is a demand for a tiled display that produces a large display with a plurality of sub-panels in the commercial display device market.

In the implementation of the tiled display, the brightness of each sub-panel may be different due to the change of the environment. Further, even if the sub-panel of the same model is used for a long period of time, the degree of deterioration of each sub-panel becomes different. Thus, a luminance deviation or a color deviation occurs between the respective sub-panels. When a luminance deviation or a color deviation occurs between adjacent sub-panels in the tiled display, a luminance deviation or a color deviation occurs at a boundary between adjacent sub-panels, and a non-uniformity of brightness or color unevenness occurring at a boundary portion between adjacent sub- .

An exemplary embodiment of the present invention is to provide a display panel and a tiled display device including the same that can prevent uneven brightness or color non-uniformity at the boundary between adjacent sub-panels.

A display panel according to an exemplary embodiment of the present invention includes a brightness measuring unit disposed at a boundary between sub-panels and sub-panels that form a display area. The luminance measuring portion of the present invention is disposed adjacent to the apex angle of the sub-panel, and each apex angle is in the shape of a picker.

A tiled display device according to an exemplary embodiment of the present invention includes a sub-panel constituting a display area, a luminance measuring part disposed at a boundary of the sub-panel, and a luminance controller for controlling luminance of the sub-panel.

An exemplary embodiment of the present invention stores an initial luminance value, measures a luminance value changed over time, compares the two values to calculate a luminance gain, and uses a luminance gain to correct a lookup table of the conversion section So that the brightness of the sub-panels can be kept the same as the initial brightness. Accordingly, the tiled display device according to an exemplary embodiment of the present invention can prevent unevenness of brightness or color non-uniformity at the boundary between adjacent sub-panels.

1 is a block diagram illustrating a display panel according to an embodiment of the present invention.
2 is a circuit diagram illustrating a pixel according to an exemplary embodiment of the present invention.
3 is a plan view of a tiled display device according to an exemplary embodiment of the present invention.
4 is a cross-sectional view of a luminance measuring unit according to an example of the present invention.
5 is a cross-sectional view illustrating a tiled display device according to an exemplary embodiment of the present invention.
6 is a detailed block diagram of a tiled display device according to an exemplary embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Where the terms "comprises," "having," "consisting of," and the like are used in this specification, other portions may be added as long as "only" is not used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

The terms "X-axis direction "," Y-axis direction ", and "Z-axis direction" should not be construed solely by the geometric relationship in which the relationship between them is vertical, It may mean having directionality.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, May refer to any combination of items that may be presented from more than one.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a display panel according to an embodiment of the present invention. A display panel according to an embodiment of the present invention includes a sub panel 100, a gate driver 110, a data driver 120, and a timing controller (T-CON) 130.

The sub-panel 100 includes a display area and a non-display area provided around the display area. The display area is an area where pixels P are provided to display an image. The sub-panel 100 is provided with gate lines GL1 to GLp, p is a positive integer of 2 or more, data lines DL1 to DLq, q is a positive integer of 2 or more, and sensing lines SL1 to SLq do. The data lines DL1 to DLq and the sensing lines SL1 to SLq may intersect the gate lines GL1 to GLp. The data lines DL1 to DLq and the sensing lines SL1 to SLq may be parallel to each other. The sub-panel 100 may include a lower substrate on which the pixels P are provided and an upper substrate on which the sealing function is performed.

Each of the pixels P may be connected to any one of the gate lines GL1 to GLp and one of the data lines DL1 to DLq and the sensing lines SL1 to SLq. Each of the pixels P may include an organic light emitting diode (OLED) and a pixel driver PD for supplying a current to the organic light emitting diode OLED.

2 is a circuit diagram illustrating a pixel according to an exemplary embodiment of the present invention. In FIG. 2, for convenience of explanation, the data line DLj, the j-th sensing line SLj, and the k-th (k is an integer satisfying 1? K? Only the pixels P connected to the scan line Sk and the kth sensing signal line SSk are shown. The pixel P includes an organic light emitting diode OLED and a pixel driver PD for supplying current to the organic light emitting diode OLED and the jth sensing line SLj.

The organic light emitting diode OLED emits light according to the current supplied through the driving transistor DT. The anode electrode of the organic light emitting diode OLED is connected to the source electrode of the driving transistor DT and the cathode electrode can be connected to the low potential voltage line ELVSSL to which a low potential voltage lower than the high potential voltage is supplied.

The organic light emitting diode OLED may include an anode electrode, a hole transporting layer, an organic light emitting layer, an electron transporting layer, and a cathode electrode. have. In the organic light emitting diode (OLED), when a voltage is applied to the anode electrode and the cathode electrode, holes and electrons move to the organic light emitting layer through the hole transporting layer and the electron transporting layer, respectively.

The pixel driver PD includes a driving transistor DT, a first transistor ST1 controlled by a scan signal of the scan line Sk, and a second transistor ST1 controlled by a sensing signal of the sensing signal line SSk. A transistor ST2, and a capacitor C as shown in Fig. The pixel driving part PD is supplied with the data voltage VDATA of the data line DLj connected to the pixel P when a scan signal is supplied from the scan line Sk connected to the pixel P in the display mode, And supplies the current of the driving transistor DT to the organic light emitting diode OLED according to the data voltage VDATA. The pixel driving part PD is supplied with the sensing voltage of the data line DLj connected to the pixel P when a scan signal is supplied from the scan line Sk connected to the pixel P in the sensing mode, DT to the sensing line SLj connected to the pixel P.

The driving transistor DT is provided between the high potential voltage line ELVDDL and the organic light emitting diode OLED. The driving transistor DT adjusts the current flowing from the high potential voltage line ELVDDL to the organic light emitting diode OLED according to the voltage difference between the gate electrode and the source electrode. The gate electrode of the driving transistor DT is connected to the first electrode of the first transistor ST1, the source electrode thereof is connected to the anode electrode of the organic light emitting diode OLED, and the drain electrode thereof is connected to the high potential And may be connected to the voltage line ELVDDL.

The first transistor ST1 is turned on by the kth scan signal of the kth scan line Sk to supply the voltage of the jth data line DLj to the gate electrode of the driving transistor DT. The gate electrode of the first transistor T1 is connected to the kth scan line Sk and the first electrode thereof is connected to the gate electrode of the driving transistor DT and the second electrode thereof is connected to the jth data line DLj . The first transistor ST1 may be referred to as a scan transistor.

The second transistor ST2 is turned on by the kth sensing signal of the kth sensing signal line SSk to connect the jth sensing line SLj to the source electrode of the driving transistor DT. The gate electrode of the second transistor ST2 is connected to the kth sensing signal line SSk, the first electrode of the second transistor ST2 is connected to the jth sensing line SLj, and the second electrode of the second transistor ST2 is connected to the source electrode of the driving transistor DT. Can be connected. The second transistor ST2 may be referred to as a sensing transistor.

The capacitor C is provided between the gate electrode and the source electrode of the driving transistor DT. The capacitor C stores the difference voltage between the gate voltage of the driving transistor DT and the source voltage.

2, the driving transistor DT and the first and second transistors ST1 and ST2 are formed of an N-type MOSFET (Metal Oxide Semiconductor Field Effect Transistor). However, it should be noted that the driving transistor DT and the first and second transistors ST1 and ST2 are not limited thereto. The driving transistor DT and the first and second transistors ST1 and ST2 may be formed of a P-type MOSFET. It should be noted that the first electrode may be a source electrode and the second electrode may be a drain electrode, but the present invention is not limited thereto. That is, the first electrode may be a drain electrode and the second electrode may be a source electrode.

The data voltage VDATA of the jth data line DLj is supplied to the gate electrode of the driving transistor DT when the scan signal is supplied to the kth scan line Sk, The initializing voltage of the j-th sensing line SEj is supplied to the source electrode of the driving transistor DT. The current of the driving transistor DT flowing in accordance with the voltage difference between the voltage of the gate electrode of the driving transistor DT and the voltage of the source electrode is supplied to the organic light emitting diode OLED in the display mode, Emits light in accordance with the current of the driving transistor DT. At this time, since the data voltage VDATA is a voltage compensated for the threshold voltage and electron mobility of the driving transistor DT, the current of the driving transistor DT does not depend on the threshold voltage and the electron mobility of the driving transistor DT .

In the sensing mode, when a scan signal is supplied to the kth scan line Sk, a sensing voltage of the jth data line is supplied to the gate electrode of the driving transistor DT, and a sensing signal is applied to the kth sensing signal line SSk The initializing voltage of the jth sensing line SLj is supplied to the source electrode of the driving transistor DT. Further, when the sensing signal is supplied to the kth sensing signal line SSk, the second transistor ST2 is turned on to drive the driving transistor DT in accordance with the voltage difference between the voltage of the gate electrode of the driving transistor DT and the voltage of the source electrode So that the current of the transistor DT flows to the jth sensing line SLj.

The gate driver 110 receives the gate driver control signal GCS from the timing controller 130. The gate driver 110 generates gate signals based on the gate driver control signal GCS. The gate driver 110 supplies the gate signals to the gate lines GL1 to GLp. The gate driver 110 may be mounted on a non-display area of the sub-panel 100 by a gate drive in panel (GIP) method. Alternatively, the gate driver 110 may be implemented as a gate drive integrated circuit (GD-IC).

The data driver 120 receives the data driver control signal DCS from the timing controller 130. The data driver 120 generates data voltages based on the data driver control signal DCS. The data driver 120 supplies the data voltages to the data lines DL1 to DLq.

The data driver 120 may include a plurality of source driver integrated circuits (ICs). Each of the source drive ICs may be mounted on each of the flexible films. Each of the flexible films may be provided with a chip on film (COF). The chip-on film may include a base film such as polyimide and a plurality of conductive lead wires provided on the base film. Each of the flexible films can be bent or bent. Each of the flexible films may be attached to a lower substrate of the sub-panel 100 and a Control Printed Circuit Board (C-PCB). In particular, each of the flexible films may be attached on the lower substrate by a TAB (Tape Automated Bonding) method using an anisotropic conductive flame (ACF), whereby the source drive ICs are connected to the data lines DL1 to DLq .

The control printed circuit board can be attached to the flexible films. The control printed circuit board can mount the timing controller 130, and signal wirings are arranged on the control printed circuit board to connect the timing controller 130 and the source drive IC mounted on the remover film.

The timing controller 130 receives digital video data (DATA) and timing signals (TS) from the system board. A timing signal and digital video data (DATA) are input to the input terminal of the timing controller 130 according to a protocol set. The timing signal TS includes a vertical sync signal VSYNC, a horizontal sync signal HSYNC, a data enable signal DE and a dot clock DCLK. . The timing controller 130 receives the sensing data SD from the data driver 120. The timing controller 130 compensates the digital video data (DATA) based on the sensing data SD.

The timing controller 130 generates driving unit control signals for controlling the operation timings of the gate driving unit 110, the data driving unit 120, the scan driving unit, and the sensing driving unit. The driving unit control signals include a gate driving unit control signal GCS for controlling the operation timing of the gate driving unit 110, a data driving unit control signal DCS for controlling the operation timing of the data driving unit 120, And a sensing driver control signal for controlling the operation timing of the sensing driver.

The timing controller 130 operates the data driver 120, the scan driver, and the sensing driver in one of a display mode and a sensing mode according to a mode signal. The display mode is a mode in which the pixels P of the sub panel 100 display an image and the sensing mode is a mode of sensing the current of the drive transistor DT of each of the pixels P of the sub panel 100. [ When the waveform of the scan signal and the waveform of the sensing signal supplied to each of the pixels P in the display mode and the sensing mode are changed, the data driver control signal DCS, the scan driver control signal, The sensing driver control signal can also be changed. Accordingly, the timing controller 130 generates the data driver control signal DCS, the scan driver control signal, and the sensing driver control signal according to the mode, depending on whether the display mode or the sensing mode.

The timing controller 130 outputs the gate driver control signal GCS to the gate driver 110. [ The timing controller 130 outputs the compensated digital video data and the data driver control signal DCS to the data driver 120. The timing controller 130 outputs a scan driver control signal to the scan driver. The timing controller 130 outputs a sensing driver control signal to the sensing driver.

The timing controller 130 generates a mode signal for driving the data driving unit 120, the scan driving unit, and the sensing driving unit depending on which of the display mode and the sensing mode is driven. The timing controller 130 operates the data driver 120, the scan driver, and the sensing driver in one of a display mode and a sensing mode according to a mode signal.

3 is a plan view showing a tiled display device 200 according to an exemplary embodiment of the present invention. The tiled display device 200 according to an exemplary embodiment of the present invention includes a plurality of sub-panels 100 and a plurality of luminance measurement units 300.

The plurality of sub-panels (100) are arranged such that the boundaries are adjacent to each other. When all of the plurality of sub-panels 100 display one content, the plurality of sub-panels 100 can display a continuous image at the boundary. Or each of the plurality of sub-panels 100 displays independent contents, each of the plurality of sub-panels 100 can independently display an image.

Each of the plurality of sub-panels 100 has a gate driver 110, a data driver 120, and a timing controller 130. For continuous image display between adjacent sub-panels 100, the timing controllers 130 of each of the plurality of sub-panels 100 are electrically connected. The timing controllers 130 included in the adjacent sub-panels 100 control the respective gate drivers 110 and the data driver 120 so that the sub-panels 100 can continuously display images.

The timing controller 130 controlling the driving of each of the sub-panels 110 may control the timing of the last gate line of one sub-panel 100 and the timing of the other gate of the other sub- The first gate line controls each of the gate drivers 110 so that gate signals are supplied continuously. The timing controllers 130 for controlling the driving of the respective subpanels 110 may sequentially receive data voltages in the last data line of one subpanel 100 and the first data line of the other subpanel 100 And controls the respective data drivers 120 to supply the data.

Accordingly, the timing controller 130 for supplying the timing signal TS to one of the sub-panels 100 may be configured such that one of the sub-panels 100 is disconnected at the boundary between the other sub-panels 100, A continuous image can be displayed while minimizing the phenomenon of occurrence of a sense of heterogeneity between the images of the images.

The brightness measuring unit 300 is disposed at a boundary between the plurality of sub-panels 100. [ The brightness measuring unit 300 measures the brightness of the adjacent sub-panels 100. The brightness measuring unit 300 measures the brightness of light emitted from each of the sub-panels 100 and measures the brightness of each sub-panel 100 using all kinds of sensors, measuring devices, or measuring devices .

4 is a cross-sectional view of a luminance measuring unit 300 according to an exemplary embodiment of the present invention. 4 illustrates a case where the luminance measuring unit 300 is a photo sensor. The photosensor is a sensor that measures the intensity of light incident in a specific direction. The brightness measuring unit 300 includes a supporting unit 310 and a sensing unit 320.

The supporting part 310 fixes the sensing part 320 so as to be disposed adjacent to the sub-panel 100. [ The supporting portion 310 has an internal circuit capable of transmitting digital data. The supporting unit 310 can transmit intensity information of each direction sensed by the sensing unit 320 to the external storage unit using an internal circuit.

The sensing unit 320 measures the intensity of light. The sensing unit 320 can measure the intensity of the incoming light from the side by direction. The sensing unit 320 can quantify the intensity of light measured for each direction. The sensing unit 320 may store the numerical intensity information of each direction in a separate storage unit. The intensity information of the stored directionalized light intensity can be defined as luminance measurement data.

5 is a cross-sectional view illustrating a tiled display device according to an exemplary embodiment of the present invention. The tiled display apparatus according to an embodiment of the present invention includes first and second sub panels 101 and 102, a luminance measuring unit 300, a transparent bonding member 400, and a rear cover 800.

The apex angle of the first and second sub-panels 101 and 102 has a chamfered shape. The vertex angle of the first and second sub panels 101 and 102 means a border line in the direction of the back cover 800 at the boundary between the first and second sub panels 101 and 102. The first sub-panel 101 emits the first light L1 to the front and the second sub-panel 102 emits the second light L2 to the front. The light-emitting layers inside the first and second sub-panels 101 and 102 emit light in all directions. Thus, the sub-panels 101 and 102 having the shape of the first and second light L1 and L2 emit the first and second lights L1 and L2 not only on the front surface but also on the vertex angle. Light is emitted to the luminance measuring unit 300 when the luminance measuring unit 300 is installed at the vertex angle of the picked-up image because the first and second lights L1 and L2 are emitted from the vertexes. Accordingly, the luminance measuring unit 300 is provided at the boundary between the first and second sub-panels 101 and 102, and can measure light to generate luminance measurement data.

The luminance measuring unit 300 measures the average luminance of each of the first and second sub-panels 101 and 102. The average luminance is obtained by measuring the total amount of light incident in the direction of the first sub-panel 101 and dividing the total amount by the surface area of the first sub-panel 101 to measure the average luminance of the first sub-panel 101, 102) to measure the average luminance of the second sub-panel 101 by dividing the total amount of light incident on the second sub-panel 102 by the surface area of the second sub-panel 102. In this case, luminance measurement data of the first sub-panel 101 and the second sub-panel 102 can be generated by using one luminance measuring unit 300.

The transparent bonding member 400 fills the boundaries of the first and second sub-panels 101 and 102. The transparent bonding member 400 fixes the brightness measuring unit 300 adjacent to the apex angle of each of the first and second sub-panels 101 and 102. The transparent adhesive member 400 is disposed between the first sub-panel 101 and the second sub-panel 102. The transparent adhesive member 400 includes a first light L1 traveling from the first sub-panel 101 to the luminance measuring unit 300 and a second light L1 traveling from the second sub- And transmits the light L2 so that the luminance measuring unit 300 can measure the light emitted from the sub-panel 100. [

The transparent bonding member 400 protrudes from the position where the luminance measuring unit 300 is disposed so that the first and second lights L1 and L2 pass through the luminance measuring unit 300 more. In FIG. 5, the structure in which the transparent bonding member 400 protrudes obliquely is illustrated, but the present invention is not limited thereto, and a structure in which the transparent bonding member 400 protrudes in a hemispherical shape or a curved surface is also feasible. The first and second lights L1 and L2 diverging in the lateral direction are guided to the transparent bonding member 400 so as to be incident on the sensing unit 320 included in the luminance measuring unit 300 more . In this case, the intensity measuring unit 300 can easily measure the intensity of light.

The rear cover 800 is disposed on the back surface of the first and second sub-panels 101 and 102. [ The rear cover 800 supports the tiled display device 200 according to an example of the present invention. The rear cover 800 fixes the first and second sub-panels 101 and 102 so as not to be separated or tilted. The rear cover 800 is disposed adjacent to the rear surface of the support portion 310, which is the back surface of the brightness measuring portion 300. The rear cover 800 fixes the luminance measuring unit 300 so as not to protrude to the front surfaces of the first and second sub-panels 101 and 102.

FIG. 6 is a detailed block diagram of a tiled display device 200 according to an exemplary embodiment of the present invention.

The display device according to an exemplary embodiment of the present invention includes a plurality of sub panels 101 to 109, a plurality of luminance measurement units 301 to 304, a storage unit 500, and a luminance control unit 600.

Each of the plurality of sub-panels 101 to 109 constitutes a display area. Each of the plurality of sub-panels 101 to 109 performs the same roles and functions as the sub-panel 100 described with reference to FIG. In FIG. 6, the tiled display device 200 is implemented using nine sub-panels in total, three in the horizontal direction and three in the vertical direction. However, the number of sub-panels is not limited to this, and the number of sub-panels may be more or less.

The plurality of luminance measuring units 301 to 304 are disposed at the boundaries of the plurality of sub-panels 101 to 109. [ More specifically, four sub-panels among the plurality of sub-panels 101 to 109 are arranged on the corner where they meet. The first luminance measurement unit 301 is disposed on the corner where the first sub-panel 101, the second sub-panel 102, the fourth sub-panel 104, and the fifth sub-panel 105 meet. The second luminance measurement unit 302 is disposed on the corner where the second subpanel 102, the third subpanel 103, the fifth subpanel 105, and the sixth subpanel 106 meet. The third luminance measurement unit 303 is disposed on the corner where the fourth subpanel 104, the fifth subpanel 105, the seventh subpanel 107, and the eighth subpanel 108 meet. The fourth luminance measurement unit 304 is disposed on the corner where the fifth subpanel 105, the sixth subpanel 106, the eighth subpanel 108, and the ninth subpanel 109 meet. When the luminance measuring units 301 to 304 are arranged as described above, one luminance measuring unit can measure the average luminance of the four sub-panels.

The storage unit 500 stores luminance measurement data measured by the plurality of luminance measurement units 301 to 304. [ The luminance measurement data includes initial luminance measurement data RGBW1 to RGBW9 that are data obtained by measuring an average luminance when a plurality of sub panels 101 to 109 start to be driven and a plurality of sub- And post-luminance measurement data (PRGBW1 to PRGBW9) which are data obtained by measuring the average luminance after one frame. The storage unit 500 receives the initial luminance measurement data RGBW1 to RGBW9 from the plurality of luminance measurement units 301 to 304 and stores the initial luminance measurement data RGBW1 to RGBW9 in an internal memory. The storage unit 500 includes first to fourth sub-memories 501 to 504.

The first sub-memory 501 stores the first luminance measurement data of the first, second, fourth, and fifth sub-panels 101, 102, 104, and 105 measured by the first luminance measurement unit 301 Second, fourth, and fifth initial luminance measurement data RGBW1, RGBW2, RGBW4, and RGBW5.

The second sub memory 502 stores the first luminance measurement data of the second, third, fifth, and sixth sub-panels 102, 103, 105, and 106 measured by the second luminance measurement unit 302, Third, fifth, and sixth initial luminance measurement data RGBW2, RGBW3, RGBW5, and RGBW6.

The third sub-memory 503 stores the first luminance measurement data of the fourth, fifth, seventh, and eighth sub-panels 104, 105, 107, and 108 measured by the third luminance measurement unit 303, Fifth, seventh, and eighth initial luminance measurement data RGBW4, RGBW5, RGBW7, and RGBW8.

The fourth sub-memory 504 stores the first luminance measurement data of the fifth, sixth, eighth, and ninth sub-panels 105, 106, 108, and 109 measured by the fourth luminance measurement unit 304, , 6th, 8th, and 9th initial luminance measurement data (RGBW5, RGBW6, RGBW8, RGBW9).

Thus, when the initial luminance measurement data measured by one luminance measurement unit is stored to correspond to one sub-memory, the initial luminance measurement data measured by one luminance measurement unit can be simultaneously loaded at the time of loading. The brightness of the first, third, seventh, and ninth sub-panels 101, 103, 107, and 109 is measured once, while the brightness of the second, fourth, sixth, , 104, 106, 108) is measured twice. Further, the luminance of the fifth sub-panel 105 is measured four times. When the luminance values of the fifth sub-panel 105 are separately stored for each of the luminance measuring units 301 to 304, it is determined whether or not the measured values for the same object are the same, and the measurement of the luminance measuring units 301 to 304 It is possible to judge whether or not the value is correct.

The luminance controller 600 is disposed on the control printed circuit board in the form of an IC chip. The luminance controller 600 is connected to the timing controllers 130 that control the plurality of sub-panels 101 to 109, respectively. The luminance control unit 600 includes a data input unit 610, a data comparison unit 620, a lookup table storage unit 630, and a luminance correction unit 640.

The data input unit 610 receives the latter luminance measurement data PRGBW1 to PRGBW9 of the plurality of sub-panels 101 to 109 from the sub-panel 100. [ The data input unit 610 supplies the latter luminance measurement data PRGBW1 to PRGBW9 to the data comparison unit 620. [

The data comparing unit 620 receives the initial luminance measurement data RGBW1 to RGBW9 from the storage unit 500 and receives the latter luminance measurement data PRGBW1 to PRGBW9 from the data input unit 610. [ The data comparing unit 620 compares the initial luminance measurement data RGBW1 to RGBW9 with the later luminance measurement data PRGBW1 to PRGBW9. The data comparator 620 calculates the luminance gain Gain which is a ratio of the initial luminance measurement data RGBW1 to RGBW9 to the latter luminance measurement data PRGBW1 to PRGBW9. The luminance gain Gain is calculated for each of the sub-panels 101 to 109 individually. The data comparing unit 620 supplies the luminance gain Gain to the luminance corrector 640. [

The luminance gain Gain is calculated according to the physical properties of the plurality of sub-panels 101 to 109. [ The luminance gain Gain is obtained by restoring the initial luminance measurement data RGBW1 to RGBW9 using the latter luminance measurement data PRGBW1 to PRGBW9 when the luminance of each of the plurality of sub panels 101 to 109 changes due to deterioration etc. .

The lookup table storage unit 630 includes a plurality of lookup tables (LUTs) corresponding to the plurality of sub-panels 101 to 109. [ Each of the plurality of lookup tables (LUTs) converts a plurality of sub-panels (101 to 109) from the RGB display mode to the RGBW display mode for each display channel. The lookup table storage unit 630 supplies a plurality of lookup tables (LUTs) to the luminance corrector 640.

The luminance corrector 640 receives the luminance gain Gain from the data comparator 620. The luminance correction unit 640 receives a plurality of lookup tables (LUTs) from the lookup table storage unit 630. The luminance correction unit 640 controls the luminance of the plurality of sub-panels 101 to 109. [ The luminance correction unit 640 includes a modulation unit 641 and a conversion unit 642. [

The modulation unit 641 receives the luminance gain Gain calculated for each of the sub-panels from the data comparison unit 620. The modulation unit 641 receives a plurality of lookup tables (LUTs) from the lookup table storage unit 630. The modulation unit 641 applies the luminance gain Gain to each of the look-up tables. The modulation unit 641 corrects the look-up table (LUT) by applying the luminance gain Gain calculated by the data comparison unit 620 to generate a correction look-up table (CLUT). The modulation section 641 supplies the correction look-up table (CLUT) to the conversion section 642. [

The conversion unit 642 converts the RGB display system to the RGBW display system using the conversion intensity set using the correction lookup table (CLUT). The converting unit 642 corrects the luminance variation or the color variation of each of the plurality of sub-panels 101 to 109. The converting unit 642 corrects the conversion intensities of the plurality of sub-panels 101 to 109 for each display channel by using the correction look-up table (CLUT).

In the case where the luminance correction section 640 uses the correction look-up table CLUT, even if the luminance changes with the lapse of time in the RGB display system, the luminance gain Gain is reflected while converting the RGB display system to the RGBW display system The luminance corresponding to the initial luminance measurement data RGBW1 to RGBW9 can be displayed. Thus, each of the sub-panels 101 to 109 can maintain the same luminance as the initial luminance.

In particular, the initial luminance measurement data RGBW1 to RGBW9 are set so as to uniformly match the luminance between adjacent sub-panels in the tiled display. However, each of the sub-panels deteriorates to different degrees as the use time passes. In this case, the luminance between the adjacent sub-panels becomes different. As a result, unevenness in brightness or non-uniformity of color occurs at the boundary between adjacent sub-panels.

An exemplary embodiment of the present invention stores an initial luminance value, measures a luminance value changed over time, compares the two values to calculate a luminance gain, and uses a luminance gain to correct a lookup table of the conversion section So that the brightness of the sub-panels can be kept the same as the initial brightness. Accordingly, the tiled display device according to an exemplary embodiment of the present invention can prevent unevenness of brightness or color non-uniformity at the boundary between adjacent sub-panels.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Accordingly, it should be understood that the above-described embodiments are illustrative and non-restrictive in every respect. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100: sub panel 110: gate driver
120: Data driver 130: Timing controller
200: tiled display 300: luminance measuring unit
400: transparent bonding member 500: storage part
600: luminance controller 800: rear cover

Claims (10)

A sub-panel constituting a display area; And
And a luminance measuring unit disposed at a boundary of the sub-panels,
Wherein the brightness measuring unit is disposed adjacent to an apex angle of the sub-panel,
Wherein each of the vertex angles is in the form of a picker. The apparatus according to claim 1,
Wherein the average luminance of the adjacent sub-panels is measured to generate luminance measurement data. 3. The method of claim 2,
And a transparent bonding member provided at a boundary portion of the sub-panel. The method of claim 3,
Wherein the transparent adhesion member protrudes from a position where the luminance measurement section is disposed. 5. The method according to any one of claims 1 to 4,
Wherein the brightness measuring unit is a photosensor. A sub-panel constituting a display area;
A luminance measuring unit disposed at a boundary of the sub-panel; And
And a luminance controller for controlling the luminance of the sub-panel,
Wherein the brightness measuring unit is disposed adjacent to an apex angle of the sub-panel,
Wherein each of the vertex angles is in the shape of a picker. The apparatus according to claim 6,
Wherein the average luminance of adjacent sub-panels is measured to generate measurement data. 8. The apparatus according to claim 7,
Wherein the initial luminance measurement data of the adjacently arranged sub-panels is measured and stored in separate sub-memories. The apparatus according to claim 8,
And measures a second luminance measurement data when a predetermined time has elapsed since the sub-panel was turned on. 10. The image display apparatus according to claim 9,
Wherein the brightness of each of the sub-panels is controlled using the initial brightness measurement data of each of the sub-panels measured by the brightness measuring unit.

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