Display device and driving method thereof

Abstract

A display apparatus and a driving method thereof, the display apparatus including a display including a plurality of display modules, a display driver including a plurality of driving modules respectively connected to the plurality of display modules, a memory storing current information about the plurality of display modules, and a processor calculating a peak brightness level of each of the plurality of display modules based on individual power consumptions of the each of the plurality of display modules and controlling the plurality of driving modules using the current information stored in the memory based on the calculated peak brightness level.

Description

[0001] This application is a divisional application of a patent application with application number 201780052327.5, filed on August 23, 2017, and titled "Display apparatus and driving method thereof." TECHNICAL FIELD

[0002] Apparatuses and methods consistent with exemplary embodiments relate to a display apparatus and a driving method thereof, and more particularly, to a display apparatus having a display configured with self-emissive pixels driven by current and a control method thereof. BACKGROUND

[0003] A light emitting diode (LED) is a semiconductor light emitting device for converting current into light. Recently, as the brightness of an LED gradually increases, LED devices are increasingly used as display light sources, automobile light sources, and illumination light sources. In addition, an LED emitting white light with superior efficiency can also be implemented by using a fluorescent material or combining LEDs of various colors.

[0004] Such an LED can display an image with high brightness at a high current. However, an LED driven at such a high current has a problem related to a color shift phenomenon.

[0005] Specifically, red, blue, and green LEDs required to implement various colors have a problem of screen quality deterioration as current increases, due to different color shift phenomena occurring according to an increase in applied current. SUMMARY

[0006] TECHNICAL PROBLEM

[0007] Exemplary embodiments can overcome the above disadvantages and other disadvantages not described above. Also, the exemplary embodiments need not overcome the above disadvantages and the exemplary embodiments can not overcome any of the problems described above.

[0008] SOLUTION TO PROBLEM

[0009] According to an aspect of an exemplary embodiment, there is provided a display apparatus including a display including a plurality of display modules, a display driver including a plurality of driving modules respectively connected to the plurality of display modules, a memory configured to store current information about the plurality of display modules, and a processor configured to calculate a peak brightness level of each of the plurality of display modules based on individual power consumptions of each of the plurality of display modules, and to control the plurality of driving modules using the current information stored in the memory based on the calculated peak brightness levels.

[0010] Each of the plurality of display modules can include a plurality of sub-pixels, and the current information can include current control information according to brightness of each sub-pixel of the plurality of display modules.

[0011] The current control information can be calibrated based on brightness characteristics and color shift characteristics according to a plurality of current levels of each sub-pixel of the plurality of display modules.

[0012] The processor can be further configured to obtain current gain values of each sub-pixel of the plurality of display modules from the memory, and control a driving state of each of the plurality of driving modules based on the obtained current gain values to make each of the plurality of display modules reach the calculated respective peak brightness levels.

[0013] The processor can be further configured to calculate the peak brightness levels of each of the plurality of display modules based on a maximum power consumption among respective power consumptions of each of the plurality of display modules and a rated capacity of each of the plurality of driving modules.

[0014] The memory can further store brightness level information of a plurality of power levels provided to each of the plurality of display modules, and the processor can be further configured to determine a reference display module among the plurality of display modules, determine a power increase of the reference display module, determine respective power increases of each of the remaining display modules among the plurality of display modules based on the power increase of the reference display module, and calculate the peak brightness levels of each of the display modules based on the maximum power amount calculated for each display module and the brightness level information of each of the plurality of power levels, wherein the reference display module consumes more power than the remaining display modules among the plurality of display modules.

[0015] The memory can further store brightness level information of a plurality of power levels provided to each of the plurality of display modules, and the processor can be further configured to determine a reference display module among the plurality of display modules, calculate a reference peak brightness level of the reference display module based on maximum brightness level information of each of the plurality of power levels, and calculate the peak brightness levels of each of the remaining display modules among the plurality of display modules based on the calculated reference peak brightness level, wherein the reference display module consumes more power than the remaining display modules among the plurality of display modules.

[0016] The memory can further store power information of each sub-pixel according to a gray scale of an image, and the processor can be further configured to calculate the power consumptions of each of the plurality of display modules based on a gray value of an image displayed on each of the plurality of display modules and the power information of each sub-pixel according to the gray scale.

[0017] Each of the plurality of display modules can include an LED cabinet including a plurality of LED devices, and the current information can include current information corresponding to each of red, green, and blue LEDs.

[0018] According to an aspect of another exemplary embodiment, there is provided a method of driving a display apparatus including a plurality of display modules connected to a plurality of driving modules, respectively, the method including calculating a peak brightness level of each of the plurality of display modules based on respective power consumptions of each of the plurality of display modules, and driving the plurality of display modules using current information corresponding to each of the plurality of display modules based on the calculated peak brightness levels.

[0019] Each of the plurality of display modules includes a plurality of sub-pixels, and the current information can include current control information according to brightness of each sub-pixel of the plurality of display modules.

[0020] The current control information can be calibrated based on brightness characteristics and color shift characteristics according to a plurality of current levels of each sub-pixel of the plurality of display modules.

[0021] The driving of the plurality of display modules can include obtaining current gain values of each sub-pixel of the plurality of display modules, and driving the plurality of display modules based on the obtained current gain values so that each of the plurality of display modules reaches the calculated respective peak brightness levels.

[0022] The calculating of the peak brightness levels can include calculating the peak brightness level of each of the plurality of display modules based on a maximum power consumption among the respective power consumptions of each of the plurality of display modules and a rated capacity of each of the plurality of driving modules.

[0023] The calculating of the peak brightness levels can include determining a reference display module among the plurality of display modules, wherein the reference display module consumes more power than remaining display modules among the plurality of display modules, determining a respective power increase of each of the remaining display modules based on a power increase of the reference display module, and calculating a peak brightness level of each of the display modules based on brightness level information of each of the plurality of power levels and a maximum power amount calculated for each of the display modules.

[0024] The step of calculating the peak brightness level can include determining a reference display module from among the plurality of display modules, wherein the reference display module consumes more power than the remaining display modules from among the plurality of display modules, calculating a reference peak brightness level of the reference display module based on the maximum brightness level information of each of the plurality of power levels, and calculating a peak brightness level of each of the remaining display modules based on the calculated reference peak brightness level.

[0025] The step of calculating the peak brightness level can include calculating power consumption of each of the plurality of display modules based on power information of each sub-pixel according to a gray scale of an image and a gray value of the image displayed on each of the plurality of display modules.

[0026] Each of the plurality of display modules can include an LED cabinet including a plurality of LED devices, and the current information can include current information corresponding to each of red, green, and blue LEDs.

[0027] According to an aspect of another exemplary embodiment, there is provided a display apparatus including a plurality of display modules, a plurality of driving modules configured to respectively drive the plurality of display modules, and a processor configured to control the plurality of driving modules to display an image on the plurality of display modules, determine a high-power display module from among the plurality of display modules based on power required for each of the plurality of display modules to display the image, determine a power increase based on power consumed by the high-power display module and a power capacity of the high-power display module, and drive another display module from among the plurality of display modules based on the power increase.

[0028] The processor can be further configured to determine the power increase by dividing the power capacity by power required for the high-power display module to display the image, and apply power to the another display module in an increase level corresponding to an initial power consumption of the another display module multiplied by the power increase rate.

[0029] The processor can be further configured to determine the power increase based on a difference between the power required for the high-power display module to display the image and the power capacity, and apply power to the another display module in an increase level corresponding to a sum of the initial power consumption of the another display module and power increased by being multiplied by a weight value corresponding to the another display module.

[0030] Advantages of the Invention

[0031] According to the various embodiments described above, since a color shift phenomenon according to an increase in current input to each sub-pixel can be prevented, screen quality provided to a user can be enhanced. Thus, a contrast ratio of a low gray scale image can be maximized without experiencing a color shift, and power consumption of a high gray scale image can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and / or other aspects will be more apparent by describing certain exemplary embodiments, with reference to the accompanying drawings, in which:

[0033] Figure 1 FIG. 1 is a diagram illustrating a display apparatus according to an exemplary embodiment;

[0034] Figure 2a and Figure 2b FIG. 2 is a block diagram illustrating a display apparatus according to an exemplary embodiment;

[0035] Figure 3a and Figure 3b FIG. 3 is a diagram describing a method for calculating power consumption of each display module according to an exemplary embodiment;

[0036] Figure 4 FIG. 4 is a diagram illustrating power information of each sub-pixel according to a gray scale level of an image according to an exemplary embodiment;

[0037] Figure 5 FIG. 5 is a diagram illustrating maximum luminance level increment information of each power provided to a display module according to an exemplary embodiment;

[0038] Figure 6 FIG. 6 is a diagram illustrating current gain information according to luminance of each sub-pixel according to an exemplary embodiment;

[0039] Figure 7 FIG. 7 is a diagram illustrating luminance characteristics of a red LED device, a blue LED device, and a green LED device according to an increase in current for understanding the present disclosure;

[0040] Figure 8a , Figure 8b and Figure 8c FIG. 8 is a diagram illustrating color shift characteristics of a red LED device, a blue LED device, and a green LED device according to an increase in current for understanding the present disclosure;

[0041] Figure 9 FIG. 9 is a flowchart describing a driving method of a display apparatus according to an exemplary embodiment.

[0042] BEST MODES FOR CARRYING OUT THE INVENTION DETAILED DESCRIPTION

[0043] Exemplary embodiments will now be described in detail with reference to the accompanying drawings.

[0044] In the following description, like reference numerals are used to describe the same elements throughout the different drawings. The matters defined in the description such as detailed construction and elements are provided to assist in a comprehensive understanding, and the exemplary embodiments can be practiced without those specifically defined matters. Also, well-known functions or constructions are not described in detail since they would obscure the exemplary embodiments with unnecessary detail.

[0045] Figure 1 FIG. 1 is a diagram illustrating a display apparatus according to an exemplary embodiment.

[0046] Referring to Figure 1 The display apparatus 100 according to an exemplary embodiment can be implemented by physically connecting a plurality of display modules 110-1, 110-2, 110-3, 110-4, …, 110-12. Here, each of the plurality of display modules can include a plurality of pixels arranged in a matrix form. The pixels can be, for example, self-emitting pixels. Specifically, the display modules can be LED modules in which each of the plurality of pixels is an LED pixel, or can be LED cabinets in which a plurality of LED modules are connected. However, these are examples, and the exemplary embodiments are not limited to the above. For example, the display modules can be implemented as a liquid crystal display (LCD), an organic LED (OLED), an active matrix OLED (AMOLED), or a plasma display panel (PDP). However, for convenience of explanation, the exemplary embodiments will be described below based on the assumption that each of the display modules is implemented as an LED cabinet.

[0047] An LED is an optical semiconductor device that converts electrical energy into light energy. Also, the LED is a type of p-n junction diode, and when light is generated, electrons of an n region move to a p region with an externally supplied current, the electrons and electron holes recombine at a junction, and the electrons recover to a ground state, causing emission of energy, i.e., light. The wavelength of the emitted light can be formed in various shapes according to energy band values, and the light color can be determined according to the wavelength. Also, the LED is a current driving device in which brightness can vary according to an applied current, and each color (red, green, and blue) can have a different resistance value. Therefore, since each electrical power applied can be different when the same current and voltage are applied, there can be a difference in brightness in each LED. Also, the LED can experience a color shift phenomenon according to an increase in the applied current, and can have different color shift values according to the LED color.

[0048] Therefore, when the current value is increased as a whole to implement high brightness on an LED display, screen quality deterioration can occur due to the brightness variation and the color shift phenomenon. Hereinafter, various LED driving methods that can prevent screen quality deterioration due to such LED characteristics in line with one or more exemplary embodiments are discussed.

[0049] Figure 2a is a block diagram illustrating a display apparatus according to an exemplary embodiment.

[0050] Referring to Figure 2a , the display apparatus 100 includes a display 110, a display driver 120, and a memory 130.

[0051] The display 110 can include a plurality of display modules. Specifically, the display 110 can be configured in a form in which a plurality of display modules 110-1,..., 110-n are connected and assembled. Here, each of the plurality of display modules can include a plurality of pixels arranged in a matrix form, and the plurality of pixels can be self-emissive pixels. According to an exemplary embodiment, the display 110 can be implemented as including a plurality of LED modules and / or a plurality of LED cabinets, wherein each LED module includes at least one LED device. Further, the LED module can include a plurality of LED pixels; according to an exemplary embodiment, the LED pixel can be implemented as an LED including a red LED, a green LED, and a blue LED.

[0052] The display driver 120 can drive the display 110 according to the control of the processor 140. For example, the display driver 120 can apply a driving voltage or cause a driving current to flow in order to drive each self-emissive device constituting the display panel 110, e.g., an LED pixel, according to the control of the processor 140.

[0053] The display driver 120 can include a plurality of LED driving modules 120-1,..., 120-n connected to the plurality of display modules 110-1,..., 110-n, respectively. The plurality of LED driving modules 120-1,..., 120-n can drive the plurality of display modules 110-1,..., 110-n by providing a driving current to the plurality of display modules 110-1,..., 110-n in correspondence with each control signal input from the processor 140, which will be described below.

[0054] Specifically, the plurality of LED driving modules 120-1,..., 120-n can adjust and output an application time or intensity of a driving current provided to the plurality of display modules 110-1,..., 110-n according to each control signal input from the processor 140.

[0055] Each of the plurality of LED driving modules 120-1,..., 120-n can include a power supply for providing electric power. The power supply is hardware for converting alternating current into direct current and providing electric power suitable for each system. The power supply can include an input electromagnetic interference (EMI) filter, an alternating current-direct current rectifier, a direct current-direct current switching converter, an output filter, and an outputter. The power supply can be, for example, a switching mode power supply (SMPS). The SMPS can be a direct current-stabilized electric power device stabilized using an output according to a switching time ratio control of a semiconductor switching device, which can provide high efficiency, miniaturization, and light weight, and thus can be used to drive each of the plurality of display modules 110-1,..., 110-n.

[0056] However, according to another exemplary embodiment, the display driver 120 can be implemented as one driving module that respectively drives a plurality of SMPSs for providing electric power to each of the plurality of display modules 110-1,..., 110-n.

[0057] According to various exemplary embodiments, the plurality of display modules 110-1,..., 110-n can respectively include a sub-processor for controlling an operation of each display module and a driving module for driving each display module according to a control of the sub-processor. In this case, the sub-processor and the driving module can be hardware, software, firmware, or an integrated chip (IC). According to an exemplary embodiment, each sub-processor can be implemented as a separate semiconductor IC.

[0058] The memory 130 can store various data required for an operation of the display apparatus 100.

[0059] The memory 130 can be a non-volatile memory, a volatile memory, a hard disk drive (HDD), or a solid state drive (SDD), a memory card (for example, a micro SD card, a USB memory) attached to the display apparatus 100, and an external memory (for example, a USB memory) connectable with an external input port.

[0060] Specifically, the memory 130 can store current information of the plurality of display modules 110-1,..., 110-n. Here, the current information can be current control information according to brightness of each sub-pixel constituting the display module. The current control information according to brightness of each sub-pixel can be calibrated (modeled) based on a brightness characteristic and a color shift characteristic according to current of each sub-pixel.

[0061] Specifically, the current control information according to the brightness of each sub-pixel can be current gain information according to the brightness of each sub-pixel, wherein the current gain information is calibrated based on brightness level information according to the current of each sub-pixel and color shift information according to the current of each sub-pixel. For example, the brightness level information according to the current of each sub-pixel can be brightness change information according to a change in the current of each R / B / G LED device, and the color shift information according to the current of each sub-pixel can be a degree of change in color coordinates (e.g., x, y color coordinates) according to a change in the current of each R / B / G device.

[0062] In this case, the current gain information according to the brightness of each sub-pixel can be obtained by calibrating the current value such that the brightness change according to the current of each R / B / G LED device is similar, and by calibrating the current value such that the color shift phenomenon of each R / B / G LED device does not occur according to the current.

[0063] However, the exemplary embodiments are not limited to the examples provided above. According to one or more exemplary embodiments, the current control information can be a current value rather than a current gain value.

[0064] In addition, the memory 130 can store brightness level information for each power level provided to the display module. The brightness of the display module increases as the power provided to the display module increases. However, when the supplied power exceeds a preset threshold value, the rate of increase in the brightness of the display module gradually decreases, and can no longer increase beyond a maximum brightness value. Accordingly, information about the change in brightness of the display module according to a change in the supplied power can be measured in advance and stored in the memory 130.

[0065] In this case, the brightness level information for each power can be brightness increase information according to an increase in the power. However, even when information in the form described above is not provided, any information representing a relationship between power supply and brightness can be applied without limitation.

[0066] In addition, the memory 130 can store power information for each sub-pixel according to a gray scale. Since the gray scale of an image is related to a brightness value, the power required for each LED device to represent a preset gray scale of an image can change. As a result, the power information for each LED device according to the gray scale of an image can be stored in the memory 130.

[0067] For example, in the case of 256 gray values (when an image has 256 gradations for each color signal of red, green, and blue) or 1024 gray values (when an image has 1024 gradations for each color signal of red, green, and blue), power information for each gray level of each LED device can be stored in the storage 130. Such power information for each gray level can be measured in advance and stored in the storage 130. Accordingly, when an image of each gray level is displayed on the display module, respectively, the power information for each gray level can be obtained by measuring the amount of power consumed in the LED device.

[0068] In addition, the storage 130 can store information on a binning group, information on a maximum luminance of each pixel, information on a color of each pixel, and a luminance correction coefficient of each pixel. Here, the binning group can be a group of LED pixels having the maximum uniformity characteristic (luminance, color coordinates) with respect to the LED pixels.

[0069] For example, in order to adjust the maximum luminance to a target luminance for uniformity between a plurality of LED pixels, the luminance can be reduced through calibration by using the luminance correction coefficient. In this case, the luminance correction coefficient can be in a 3*3 matrix form to achieve target red, green, and blue luminances, and the maximum luminance can be a target luminance obtained by applying different luminance correction coefficients to each pixel, thereby achieving uniformity. In addition, in achieving the target luminance in a parameter in a 3*3 matrix form corresponding to each LED element, the color temperature can also be calibrated to obtain uniformity.

[0070] In addition, the storage 130 can store information on a plurality of pixels constituting each of a plurality of display modules, a size of the plurality of pixels, and an internal distance between the plurality of pixels.

[0071] Meanwhile, according to another exemplary embodiment, the information stored in the storage 130 described above can be obtained from an external device. For example, a part of the information can be received from an external device, such as a set-top box, an external server, and a user terminal, in real time.

[0072] The processor 140 can control overall operations of the display apparatus 100. The processor 140 can include one or more of a central processor (CPU), a controller, an application processor (AP), a communication processor (CP), and an ARM processor.

[0073] In addition, the processor 140 can include a graphic processing unit for graphic processing corresponding to an image. The processor 140 can be implemented as a system on chip (SoC) including a core and a GPU. The processor 140 can include a single core, a dual core, a triple core, a quad core, and a multi core.

[0074] According to an exemplary embodiment, the processor 140 can calculate a peak brightness level of each of the plurality of display modules 110-1,..., 110-n based on the respective power consumptions calculated for each of the plurality of display modules 110-1,..., 110-n. Thereafter, the processor 140 can control each of the plurality of driving modules 120-1,..., 120-n to have a peak brightness level corresponding to each of the plurality of display modules 110-1,..., 110-n, respectively, based on the current information for each brightness stored in the memory 130.

[0075] In this case, the processor 140 can calculate the amount of power consumed in each of the plurality of display modules 110-1,..., 110-n based on the gray scale values of the image displayed on each of the plurality of display modules 110-1,..., 110-n and the power information for each sub-pixel by gray scale level obtained from the memory 130.

[0076] For example, as shown in FIG. 1A, it is assumed that the plurality of display modules 110-1,..., 110-n can be implemented as a first display module 110-1 to a fourth display module 110-4 and can be driven by driving modules 120-1 to 120-4, respectively. Figure 2b

[0077] In this case, as shown in FIG. 1B, one image frame can be divided and displayed on the first display module 110-1 to the fourth display module 110-4. In this case, the gray scale levels corresponding to each of the first image region to the fourth image region provided to the first display module 110-1 to the fourth display module 110-4 can be generally different. When one image frame is divided into a plurality of image regions, the images respectively included in the divided image regions can be different from each other. Figure 3a

[0078] The processor 140 can calculate the amount of power consumed in the first display module 110-1 to the fourth display module 110-4 based on the image gray scale values to be represented by each sub-pixel when the first image region to the fourth image region is displayed on the first display module 110-1 to the fourth display module 110-4. In this case, the processor 140 can calculate the amount of power consumed in the first display module 110-1 to the fourth display module 110-4 based on the power information for each LED device by gray scale level stored in the memory 130.

[0079] Figure 4 FIG. 1C is a diagram illustrating power information for each sub-pixel by gray scale level of an image according to an exemplary embodiment.

[0080] For example, as shown in FIG. 1D, it is assumed that the plurality of display modules 110-1,..., 110-n can be implemented as a first display module 110-1 to a fourth display module 110-4 and can be driven by driving modules 120-1 to 120-4, respectively. Figure 4 ​​As illustrated, the amount of power consumed can be different when each LED device represents each of 1024 gray levels. In general, in the case of a red LED device, the power required to represent a uniform gray value is relatively large compared to green LED devices and blue LED devices, and green LED devices and blue LED devices require similar amounts of power to represent a uniform gray value.

[0081] The power value required for each LED device to represent a gray level of an image can be pre-stored in the storage 130, and the processor 140 can calculate individual power consumptions of each of the first to fourth display modules 110-1 to 110-4 based on the pre-stored information.

[0082] For example, as Figure 3b illustrated, the power consumptions of the first to fourth display modules 110-1 to 110-4 can be calculated as 60 Watts (W), 100 W, 70 W, and 50 W, respectively.

[0083] Thereafter, the processor 140 can calculate a peak brightness level of each of the plurality of display modules 110-1,..., 110-n based on the individual power consumptions calculated for each of the plurality of display modules 110-1,..., 110-n and the capacity that can be provided by the plurality of driving modules 120-1,..., 120-n. Here, the capacity of power that can be provided by the plurality of driving modules 120-1,..., 120-n can correspond to the capacity of the plurality of power supplies included in each of the plurality of driving modules 120-1,..., 120-n (i.e., the regular capacity (or regular output) of the SMPS).

[0084] In detail, the processor 140 can calculate a peak brightness level of each of the plurality of display modules 110-1,..., 110-n based on the maximum power consumption among the individual power consumptions of each of the plurality of display modules 110-1,..., 110-n and the capacity that can be provided by each of the plurality of driving modules 120-1,..., 120-n.

[0085] In detail, the processor 140 can determine a maximum power amount of a reference display module having the maximum power consumption among the plurality of display modules 110-1,..., 110-n, and calculate a power increase rate based on the power consumption of the reference display module and the maximum power amount.

[0086] For example, the power increase rate Pr can be calculated by dividing the maximum power amount of the reference display module by the power consumption of the reference display module. Meanwhile, the maximum power amount of the reference display module can be the same as the capacity that can be provided by each of the plurality of driving modules 120-1,..., 120-n, but is not limited thereto.

[0087] Thereafter, the processor 140 can calculate the maximum power amount of the other display modules by applying the calculated power increase rate Pr to the power consumptions of the other display modules. Accordingly, the maximum power amount of the other display modules can be calculated by multiplying the power consumption of each display module by the power increase rate Pr.

[0088] For example, as shown in FIG. 11B, when the power consumptions of the first to fourth display modules 110-1 to 110-4 are 60 W, 100 W, 70 W, and 50 W, respectively, and when the maximum power amount of the second display module 110-2 having the maximum power consumption of 100 W is determined to be the regular capacity 300 W, the power increase rate can be 3. Figure 3b

[0089] In this case, the processor 140 can apply the power increase rate 3 to the power consumptions of the first, third, and fourth display modules 110-1, 110-3, and 110-4, and determine the maximum power amounts of the first, third, and fourth display modules 110-1, 110-3, and 110-4 to be 60 W*3 = 180 W, 70 W*3 = 210 W, and 50 W*3 = 150 W, respectively.

[0090] However, according to various exemplary embodiments, the power increase rate Pr can be applied using a preset weighting value α. Also, the power increase rate applied to the other display modules can be applied using different weighting values according to the power of each display module, and different power increase rates Pr*α1, Pr*α2, Pr*α3 can be calculated in each display module.

[0091] However, this is merely exemplary; according to another exemplary embodiment, a preset weighting value can be applied based on the power increase in the reference display module, and the power amount to which the weighting value is applied can be determined as the increased power amount of the other display modules.

[0092] For example, the power increase 200 W of the second display module 110-2 can be applied using a preset weighting value based on the power consumptions of each display module. For example, the power increase to which the weighting values β1, β2, β3 calculated based on the power consumptions 60 W, 70 W, 50 W of each of the first, third, and fourth display modules 110-1, 110-3, and 110-4 is applied (i.e., 200 W*β1, 200 W*β2, 200 W*β3) can be determined to correspond to the increased power amount. In this case, the maximum power amount of each of the first, third, and fourth display modules 110-1, 110-3, and 110-4 can be 60 W+200 W*β1, 70 W+200 W*β2, 50 W+200 W*β3. ​

[0093] Thereafter, the processor 140 can determine the peak brightness level of each of the plurality of display modules 110-1,..., 110-n based on the maximum brightness level information for each power provided to the display module stored in the memory 130 and based on the maximum power amount of each of the plurality of display modules 110-1,..., 110-n.

[0094] Figure 5 is a graph illustrating a maximum brightness level increment for each power provided to a display module according to an exemplary embodiment.

[0095] For example, as Figure 5 indicated in the graph showing that the brightness increases according to the increase in power, the maximum brightness level increment for each power level is shown. As shown in the graph, as the power increase rate increases, the amount of brightness that increases for a uniform power amount can gradually decrease. However, for the information that can be used according to an exemplary embodiment, any information representing the relationship between the power supplied and the brightness can be applied, and is not limited thereto.

[0096] The processor 140 can determine the peak brightness level of each of the plurality of display modules 110-1,..., 110-n based on such information.

[0097] However, according to another exemplary embodiment, the reference peak brightness level of a reference display module having the maximum power consumption among the plurality of display modules 110-1,..., 110-n can be calculated, and the peak brightness level of each of the other display modules can be calculated based on the calculated reference peak brightness level.

[0098] For example, as Figure 3b indicated in the graph, when the power consumptions of the first display module 110-1 to the fourth display module 110-4 are 60 W, 100 W, 70 W, and 50 W, respectively, and when it is determined that the maximum power amount of the second display module 110-2 having the maximum power consumption of 100 W is a regular capacity of 300 W, the peak brightness level of the second display module 110-2 can be calculated.

[0099] Thereafter, the processor 140 can calculate the peak luminance level of the first display module 110-1, the third display module 110-3, and the fourth display module 110-4 based on the peak luminance level of the second display module 110-2. For example, when it is calculated that the peak luminance level of the second display module 110-2 is A nits, and when the current luminance level is B nits, the luminance increase rate A / B calculated as discussed above can be applied to the luminance level of the first display module 110-1, the third display module 110-3, and the fourth display module 110-4. Accordingly, the peak luminance level of each of the first display module 110-1, the third display module 110-3, and the fourth display module 110-4 can be calculated.

[0100] Meanwhile, the processor 140 can obtain a current gain value of each sub-pixel corresponding to each of the plurality of display modules 110-1,..., 110-n such that each of the plurality of display modules 110-1,..., 110-n has the calculated peak luminance level, and control a driving state of each of the plurality of driving modules 120-1,..., 120-n based on the obtained current gain value of each sub-pixel.

[0101] In other words, the memory 130 can store current gain information according to the luminance of each sub-pixel constituting the plurality of display modules 110-1,..., 110-n.

[0102] Figure 6 is a graph illustrating current gain information according to the luminance of each sub-pixel according to an exemplary embodiment.

[0103] The current gain information according to the luminance of each sub-pixel, such as the information illustrated in Figure 6 , can include a current gain value according to the luminance of each sub-pixel calibrated based on the luminance and color characteristics according to current increase of each sub-pixel.

[0104] Specifically, as illustrated in Figure 7 , a red LED device, a blue LED device, and a green LED device can have different luminance increase characteristics according to current increase. Further, as illustrated in Figure 8a and Figure 8b , since the color coordinates become different according to different shapes according to current increase, the red LED device, the blue LED device, and the green LED device can have different color shift characteristics. For example, as illustrated in Figure 8a , the red LED device can maintain uniform values of x and y coordinates according to current increase; however, as illustrated in Figure 8b , the green LED device can slightly modify the x and y coordinates, and as illustrated in Figure 8cAs shown, the blue LED device can greatly modify the x coordinate, y coordinate according to the current increase.

[0105] Thus, the memory 130 can store the current gain value for the brightness of each LED device calculated by considering the brightness characteristics according to the current of each LED device as shown in Figure 7 Figure 8a , Figure 8b and Figure 8c the color characteristics according to the current of each LED device as shown inAs an example, the current gain information can include the current gain value divided into 128 steps based on 8-bit information, but is not limited thereto.

[0106] For example, the peak brightness levels corresponding to the maximum power amounts 180W, 300W, 210W, 150W of each of the first to fourth display modules 110-1 to 110-4 can be determined as A, B, C, D, respectively, and the gain values of the currents flowing in each LED device can be applied based on the curves of Figure 6 for the specific current values required to achieve each brightness level. In other words, the latest current values applied for each of the current values a, b, c, d to achieve the peak brightness levels of each of the first to fourth display modules 110-1 to 110-4 and the current gain values according to the characteristics of each LED device can be applied to the first to fourth display modules 110-1 to 110-4.

[0107] For example, the gain values gr1, gg1, gb1 for driving each LED device of the first display module 110-1 can be applied to the corresponding current value a, respectively, the gain values gr2, gg2, gb2 for driving each LED device of the second display module 110-2 can be applied to the corresponding current value b, respectively, the gain values gr3, gg3, gb3 for driving each LED device of the third display module 110-3 can be applied to the corresponding current value c, respectively, and the gain values gr4, gg4, gb4 for driving each LED device of the fourth display module 110-4 can be applied to the corresponding current value d, respectively. Thus, the brightness of the first to fourth display modules 110-1 to 110-4 can be controlled by the peak brightness levels.

[0108] Figure 9 is a flowchart illustrating a driving method of a display apparatus according to an exemplary embodiment.

[0109] The display apparatus to which the driving method according to an exemplary embodiment shown in Figure 9 may be applied can include a display constituted by a plurality of display modules.

[0110] According to Figure 9The driving method of the display apparatus shown in FIG. 10 can calculate the individual power consumptions of each of the plurality of display modules at S910.

[0111] The driving method of the display apparatus shown in FIG. 10 can calculate the peak brightness level of each of the plurality of display modules based on the calculated power consumptions at S920.

[0112] The driving method of the display apparatus shown in FIG. 10 can drive the plurality of display modules to the respective peak brightness levels of each of the plurality of display modules based on the current information of the plurality of display modules at S930.

[0113] In this case, the current information can include current control information according to the brightness of each sub-pixel constituting the display module. Specifically, the current information can include current control information (e.g., current gain values or current values) according to the brightness of each sub-pixel, which is calibrated based on the brightness characteristics and color shift characteristics according to the current of each sub-pixel. Meanwhile, the current information can be pre-stored in the display apparatus or can be received from an external device (e.g., a set-top box, a user terminal, a server, etc.).

[0114] Meanwhile, the driving method of the display apparatus shown in FIG. 10 can calculate the peak brightness level of each of the plurality of display modules based on the maximum power consumption among the individual power consumptions of each of the plurality of display modules and the capacity that can be provided by each of the plurality of driving modules at S920.

[0115] Further, the processor can determine the power increase of the other display modules based on the power increase of a reference display module having the maximum power consumption among the individual power consumptions of each of the plurality of display modules and calculate the peak brightness level of each of the display modules based on the maximum power amount calculated for each of the display modules and the brightness level information of each power provided to the display modules. Here, the brightness level information of each power provided to the display modules can be pre-stored in the display apparatus or can be received from an external device (e.g., a set-top box, a user terminal, a server, etc.).

[0116] Further, the driving method of the display apparatus shown in FIG. 10 can calculate the reference peak brightness level of a reference display module having the maximum power consumption among the plurality of display modules based on the maximum brightness level information of each power and calculate the peak brightness level of each of the other display modules based on the calculated reference peak brightness level information at S920.

[0117] Further, the driving method of the display apparatus shown in FIG. 10 can obtain current gain values of each sub-pixel corresponding to each of the plurality of display modules (where the current gain values of each sub-pixel allow each of the plurality of display modules to reach the calculated peak brightness level) at S930 and can drive the plurality of display modules based on the obtained current gain values of each sub-pixel, respectively.

[0118] Further, at S910, individual power consumptions of each of the plurality of display modules can be calculated based on a gray value of an image displayed on each of the plurality of display modules and power information of each sub-pixel according to a gray scale. The power information of each sub-pixel according to a gray scale of an image can be pre-stored in the display apparatus or can be received from an external device (e.g., a set-top box, a user terminal, a server, etc.).

[0119] Meanwhile, the plurality of display modules can be implemented as an LED cabinet including a plurality of LED devices, and each sub-pixel can be implemented as one among a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

[0120] According to various exemplary embodiments of the present disclosure, since a color shift phenomenon according to an increase in current input to each sub-pixel can be prevented, screen quality provided to a user can be enhanced. Accordingly, a contrast of a low gray image can be maximized without color shift, and electric power consumed by a high gray image can be reduced.

[0121] Meanwhile, a method according to various exemplary embodiments of the present disclosure can be implemented through software / hardware upgrade of a display apparatus.

[0122] Further, a non-transitory computer-readable recording medium storing a program for continuously executing a driving method according to an exemplary embodiment can be provided.

[0123] The non-transitory computer-readable recording medium indicates a medium that stores data semi-permanently and can be read by a machine, rather than a medium for temporarily storing data such as a register, a cache, or a memory. Specifically, the various applications or programs described above can be stored and provided in a non-transitory computer-readable recording medium such as a CD, a DVD, a hard disk, a Blu-ray disk, a USB, a memory card, or a ROM.

[0124] The above-described exemplary embodiments and advantages are merely exemplary and are not to be interpreted as limiting. It is readily apparent that the present teachings are amenable to a variety of modifications and applications. Furthermore, the exemplary embodiments are intended to be illustrative only and the scope of the claims should not be limited to the precise type shown and described.

Claims

1. A display device, comprising: The memory is configured to store power information for each gray level; A display includes a plurality of display modules, each of the plurality of display modules including a sub-pixel; The processor is configured as follows: Obtain the grayscale value of the portion of the image on the display corresponding to each of the plurality of display modules. The power consumption of each of the plurality of display modules is calculated based on the grayscale value and the power information stored in the memory, wherein the power information is the power information of each sub-pixel according to the grayscale level. Based on the power consumption, calculate the peak brightness level of each of the plurality of display modules, and Each of the plurality of display modules is controlled based on the peak brightness level.

2. The display device as claimed in claim 1, wherein, The memory is also configured to store brightness level information for each power level, wherein the processor is further configured to: The peak brightness level of each display module is calculated based on the maximum power consumption calculated for each of the plurality of display modules and the brightness level information for each power stored in the memory.

3. The display device as claimed in claim 2, wherein, The brightness level information for each power level is the brightness increase information based on the power increase.

4. The display device as claimed in claim 1, wherein, The memory is also configured to store current information about the plurality of display modules. The processor is further configured to control each of the plurality of display modules using the current information stored in the memory based on the peak brightness level.

5. The display device as claimed in claim 4, further comprising: A display driver, comprising multiple drive modules respectively connected to the plurality of display modules. The processor is further configured as follows: The calculated peak brightness level is used to control the multiple drive modules using the current information stored in the memory.

6. The display device as claimed in claim 1, wherein, The processor is also configured to: Each of the plurality of display modules is controlled to have a peak brightness level corresponding to each of the plurality of display modules.

7. The display device as claimed in claim 1, wherein, Each of the plurality of display modules is an LED cabinet comprising a plurality of LED pixels, the plurality of LED pixels including red LEDs, green LEDs and blue LEDs.

8. The display device as claimed in claim 4, wherein, in, The current information includes current control information based on the brightness of each sub-pixel in the plurality of display modules.

9. The display device as claimed in claim 8, wherein, The current information is calibrated based on brightness and color shift characteristics of multiple current levels for each sub-pixel of the plurality of display modules.

10. The display device as claimed in claim 5, wherein, The processor is also configured to: The current gain value of each sub-pixel of the plurality of display modules is obtained from the memory, and the driving state of each of the plurality of driving modules is controlled based on the obtained current gain value so that each of the plurality of display modules reaches the calculated peak brightness level.

11. A method performed by a display device, the display device storing power information for each grayscale level and including a display, the display including a plurality of display modules, each of the plurality of display modules including a sub-pixel, the method comprising: Obtain the grayscale value of the portion of the image on the display corresponding to each of the plurality of display modules; The power consumption of each of the plurality of display modules is calculated based on the grayscale value and the power information stored in the display device, wherein the power information is the power information of each sub-pixel according to the grayscale level; The peak brightness level of each of the plurality of display modules is calculated based on the power consumption; each of the plurality of display modules is controlled based on the peak brightness level.

12. The method of claim 11, wherein, The display device stores brightness level information for each power level, wherein the step of calculating the peak brightness level information includes: The peak brightness level of each display module is calculated based on the maximum power consumption calculated for each of the plurality of display modules and the brightness level information for each power stored in the display device.

13. The method of claim 12, wherein, The brightness level information for each power level is the brightness increase information based on the power increase.

14. The method of claim 11, wherein, The display device stores current information about the plurality of display modules, wherein the step of controlling each of the plurality of display modules includes: controlling each of the plurality of display modules using the current information stored in the display device based on the peak brightness level.

15. The method of claim 14, wherein, The display device includes: a display driver, comprising multiple driver modules respectively connected to the plurality of display modules. The steps for controlling each of the plurality of display modules include: The calculated peak brightness level is used to control the multiple drive modules using the current information stored in the display device.

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