Display device and control method thereof

Abstract

A display device and a control method thereof are provided. The display device includes a display panel, a backlight, and a processor. The display panel includes a plurality of pixels and is configured to display an image corresponding to an image signal, the backlight includes a plurality of light sources and is configured to independently operate a light-emitting block corresponding to each of the plurality of light sources to provide light to the display panel, and the processor is configured to control the amount of light of each of the plurality of light sources based on the image signal. The processor is configured to: calculate the amount of red light (R), the amount of green (G), and the amount of blue (B) light that is configured to be emitted to an area on the display panel by at least one of the plurality of light sources, identify color information of an area based on each of the calculated amounts of R light, G light, and B light, and adjust the image signal corresponding to an area based on the identified color information.

Description

Technical Field

[0001] The present disclosure relates to a display device and a control method thereof, for example, to a display device using a plurality of light sources and a control method thereof. Background Art

[0002] Driven by the development of electronic technology, various types of electronic devices are being developed and popularized. In particular, display devices such as mobile devices and televisions, which are the most commonly used recently, have been rapidly developed in recent years.

[0003] Conventional display devices output image signals by implementing local dimming to enhance dynamic range and contrast. However, when controlling local dimming, problems may arise: the light provided to the panel is uneven, and a yellowing phenomenon may occur in which the ratio of green light to red light increases in one area of ​​the panel.

[0004] Furthermore, there is a problem in that, when a display device outputs an image signal, an undesirable yellowing phenomenon provides a screen including distorted colors to a user. Summary of the invention

[0005] Embodiments of the present disclosure provide a display device and a control method thereof for preventing and / or reducing a yellowing phenomenon that may occur in one area of ​​a panel when controlling local dimming.

[0006] An image processing device according to an exemplary embodiment of the present disclosure includes: a display panel including a plurality of pixels configured to display an image based on an image signal, a backlight including a plurality of light sources configured to independently operate a light-emitting block corresponding to each of a plurality of light sources to provide light to the display panel, and a processor configured to control the amount of light of each of the plurality of light sources based on the image signal. The processor is configured to calculate (e.g., determine or identify) the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light configured to be emitted to an area on the display panel by at least one of the plurality of light sources, identify color information of the area based on each of the calculated (e.g., determined or identified) amounts of R light, G light, and B light, and adjust the image signal corresponding to the area based on the identified color information.

[0007] Based on the distance between at least one light source and this area and the intensity of at least one light source, the processor can calculate (e.g., determine or identify) each of the amount of R light, the amount of G light, and the amount of B light in the light emitted to this area.

[0008] Based on the first light source among multiple light sources being configured to emit the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light to this area, and the second light source among multiple light sources being configured to emit the sum of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light to this area, the processor can identify the color information of this area.

[0009] The processor may recognize color information based on conversion of each of the calculated amounts of R light, G light, and B light into color coordinates.

[0010] The color information may include color temperature.

[0011] This region may be a region corresponding to at least one of a plurality of light-emitting blocks or a region corresponding to at least one of a plurality of pixels on the display panel.

[0012] The processor may adjust the ratio among the red (R), green (G), and blue (B) signals of the image signal corresponding to the area based on the recognized color information.

[0013] Based on the color temperature of the identified color information being higher than or equal to the threshold temperature, the processor may be configured to adjust the ratio among the R signal, the G signal, and the B signal so that the intensity of the B signal is increased relative to the intensity of the R signal and the intensity of the G signal. Based on the color temperature of the identified color information being lower than the threshold temperature, the processor may be configured to adjust the ratio among the R signal, the G signal, and the B signal so that the intensity of the B signal is reduced relative to the intensity of the R signal and the intensity of the G signal.

[0014] The display device may further include: a memory storing information about the intensity ratio of the RGB image signal for each color information, and a processor configured to adjust the ratio between the R signal, the G signal and the B signal of the image signal corresponding to this area based on the information stored in the memory and the identified color information.

[0015] The display device may further include: a memory including information about the amount of light of each of RGB based on the distance between at least one light source among the plurality of light sources and the display panel. Based on the information of the amount of light stored in the memory, the processor may calculate the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light based on the distance between at least one light source and the region.

[0016] The backlight may further include an optical sheet separately disposed above the plurality of light sources. The information on the light quantity may be information calculated based on a first light quantity emitted by at least one light source and reaching an area of ​​the optical sheet and a second light quantity emitted by at least one light source and reflected on the optical sheet and reaching an area of ​​the optical sheet.

[0017] In the display device, the backlight may include a light sheet, and each of the plurality of light sources may include a blue LED, and the light sheet may include a quantum dot sheet.

[0018] The display device includes a backlight including a plurality of light sources configured to independently operate a light-emitting block corresponding to each of the plurality of light sources to provide light to a display panel. According to a disclosed example embodiment, a method for controlling the display device includes: calculating (e.g., determining) an amount of red (R) light, an amount of green (G) light, and an amount of blue (B) light configured to be emitted to an area on the display panel by at least one of the plurality of light sources, identifying color information of an area based on each of the calculated (e.g., determined or identified) amounts of R light, G light, and B light, and adjusting an image signal of the area based on the identified color information.

[0019] Based on the first light source among multiple light sources being configured to emit the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light to this area and the second light source among multiple light sources being configured to emit the sum of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light to this area, identifying color information may include identifying color information of this area.

[0020] Identifying the color information may include identifying the color information based on conversion of each of the calculated amounts of the R light, the G light, and the B light into color coordinates.

[0021] The color information may include color temperature.

[0022] This region may be a region corresponding to at least one of the plurality of light-emitting blocks, or a region corresponding to at least one of the plurality of pixels on the display panel.

[0023] Adjusting the image signal may include adjusting a ratio among a red (R) signal, a green (G) signal, and a blue (B) signal of the image signal corresponding to the region according to the recognized color information.

[0024] Adjusting the image signal may include: based on the color temperature of the identified color information being higher than or equal to a threshold temperature, adjusting the ratio among the R signal, the G signal, and the B signal so that the intensity of the B signal is increased relative to the intensity of the R signal and the intensity of the G signal; and based on the color temperature of the identified color information being lower than the threshold temperature, adjusting the ratio among the R signal, the G signal, and the B signal so that the intensity of the B signal is reduced relative to the intensity of the R signal and the intensity of the G signal.

[0025] Adjusting the image signal may include: reading the ratio of the intensity of the RGB image signal corresponding to the identified color information from the memory, wherein the memory stores information about the intensity ratio of the RGB image signal for each color information; and adjusting the ratio between the R signal, the G signal and the B signal of the image signal corresponding to this area.

[0026] According to various exemplary embodiments of the present disclosure, local dimming may be effectively implemented when displaying an image signal using a plurality of light sources.

[0027] According to various exemplary embodiments of the present disclosure, it may be predicted that light emitted from a light source and provided to one area of ​​a display panel is uneven when local dimming is controlled.

[0028] Furthermore, according to various exemplary embodiments of the present disclosure, when light supplied to an area of ​​a display panel is uneven, it can be predicted that color distortion and yellowing phenomena may occur, and an image signal may be output while adjusting so that the yellowing phenomenon does not occur and / or is reduced in this area. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings:

[0030] Figure 1 is a schematic diagram showing an example configuration of an example backlight according to an embodiment of the present disclosure;

[0031] Figure 2 is a block diagram illustrating an example configuration of an example display device according to an embodiment of the present disclosure;

[0032] Figure 3 is a schematic diagram showing an example of multiple light sources according to an embodiment of the present disclosure;

[0033] Figure 4 is a schematic diagram showing an example of local dimming according to an embodiment of the present disclosure;

[0034] Figure 5 is a schematic diagram showing an example amount of blue (B) light according to an embodiment of the present disclosure;

[0035] Figure 6 is a schematic diagram showing an example amount of red (R) light according to an embodiment of the present disclosure;

[0036] Figure 7 is a schematic diagram showing an example amount of red (R) light according to an embodiment of the present disclosure;

[0037] Figure 8 is a graph showing light amount information of RGB according to an embodiment of the present disclosure;

[0038] Fig. 9 is a schematic diagram showing the amount of light emitted to an area according to an embodiment of the present disclosure;

[0039] Fig.10 A schematic diagram showing information of intensity ratio of RGB image signals for each color information according to an embodiment of the present disclosure is shown;

[0040] Fig.11 is a block diagram illustrating an example display device according to an embodiment of the present disclosure; and

[0041] Fig.12 is a flowchart illustrating an example method of controlling a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] The present disclosure will be described in more detail below with reference to the accompanying drawings.

[0043] For the terms used in the embodiments of the present disclosure, currently widely used common terms are selected as much as possible, taking into account the functions described in the present disclosure. However, these terms may vary depending on the intentions of technicians working in related fields, previous court decisions, or the emergence of new technologies. In addition, in some cases, certain terms may be arbitrarily selected, in which case the meanings of these terms will be described in the relevant description of the present disclosure. Therefore, the terms used in the present disclosure should be defined according to the meaning of the terms and the overall content of the present disclosure, rather than simply defined according to the names of the terms.

[0044] In the present disclosure, expressions such as “having”, “may have”, “including” and “may include” should be understood to mean having such features (e.g., elements such as values, functions, operations, and components), and these expressions are not intended to exclude the existence of additional features.

[0045] The expression “at least one of A and B” should be interpreted as including any one of “A” or “B” or “A and B”.

[0046] The expressions of "first", "second" and the like used in the present disclosure may be used to describe various elements, regardless of their order and / or importance. Likewise, such expressions may be used to distinguish one element from another, but are not intended to limit an element.

[0047] An element (e.g., a first element) described in the present disclosure as being "(operably or communicatively) coupled to" or "connected to" another element (e.g., a second element) should be interpreted as including two cases: one element being directly coupled to another element, and one element being coupled to the other element through another element (e.g., a third element).

[0048] As long as it does not conflict obviously with the context, singular expressions also include plural expressions. In addition, in the present disclosure, terms such as "comprising" and "consisting of" should be understood to indicate that these features, numbers, steps, operations, elements, components or their combinations are described in the present disclosure, but do not preclude the possibility of existing or adding one or more other features, numbers, steps, operations, elements, components or their combinations.

[0049] In the present disclosure, a "module" or "part" can perform at least one function or operation and can be implemented as hardware or software or as a combination of hardware and software. In addition, in addition to the "module" or "part" that needs to be implemented as specific hardware, multiple "modules" or "parts" can be integrated into at least one module and implemented as at least one processor (not shown).

[0050] In the present disclosure, the term "user" may refer to a person using an electronic device or a device using an electronic device (eg, an artificial intelligence electronic device).

[0051] Various exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0052] Figure 1 is a schematic diagram illustrating an example implementation of an example backlight according to an embodiment of the disclosure.

[0053] according to Figure 1 As shown, the display device 100 according to an embodiment of the present disclosure may include a display panel 110 and a backlight unit (eg, backlight) 120 .

[0054] The display device 100 can display video data. The display device 100 can be implemented as a TV (but not limited to this), and any device equipped with a display function, such as but not limited to: a video wall, a large display (LFD), a digital signage, a digital information display (DID), a projector display, etc., can be applied without restriction. The display device 100 can be implemented in various forms of displays, such as but not limited to: a liquid crystal display (LCD), an organic light emitting diode (OLED), a liquid crystal on silicon (LCoS), a digital light processor (DLP), a quantum dot (QD) display panel, a quantum dot light emitting diode (QLED), a micro light emitting diode (μLED), a mini LED, etc. The display device 100 can be implemented, for example, as: a touch screen combined with a touch sensor, a flexible display, a rollable display, a 3D display, a display physically connected to multiple display modules, etc., but is not limited to this.

[0055] The display panel 110 according to an embodiment of the present disclosure may include a plurality of pixels and display an image signal. For example, the display panel 110 may be implemented as a liquid crystal display panel, but is not limited thereto. A liquid crystal panel is a display panel implemented as a liquid crystal device, which is a display device using liquid crystals that can electronically control the transmittance of light.

[0056] According to an embodiment of the present disclosure, the display panel 110 can be operated by injecting liquid crystal between two glass plates, and by turning on / off the thin film transistor, the injected liquid crystal allows the light provided by the backlight unit 120 to pass through in a vertical arrangement and a horizontal twisted arrangement, and scans the light on the front surface of the display panel 110.

[0057] The liquid crystal panel is implemented as a liquid crystal device that does not emit light itself, and therefore, in order for the liquid crystal panel to realize an image, the display device 100 should include a backlight unit 120. The backlight unit 120 plays a role in evenly spreading the light so that the eyes can see the display image. The terms "backlight" and "backlight unit" are used interchangeably herein to indicate that the components for providing backlight to the display are included.

[0058] The backlight unit 120 according to an embodiment of the present disclosure may include a plurality of light sources 121 , a light guide plate (not shown), and an optical sheet 122 .

[0059] When powered, the backlight unit 120 may emit monochromatic light (eg, light of a specific wavelength). For example, the backlight unit 120 according to an embodiment of the present disclosure may emit white light.

[0060] The plurality of light sources 121 provided on the backlight unit 120 according to an embodiment of the present disclosure may be implemented as blue light emitting diodes (blue LEDs) to achieve high color reproducibility. The optical sheet 122 may be implemented as a quantum dot (QD) sheet. The quantum dot sheet may produce various colors by converting the wavelength of light emitted by the plurality of light sources 121 according to the size of the particles. For example, the optical sheet 122 may generate red (R) light and green (G) light by converting some wavelengths of blue (B) light emitted by the light source 121. Because the optical sheet 122 converts the wavelength of light, it may be referred to as a wavelength conversion unit, but for ease of explanation, it may be referred to as an optical sheet 122.

[0061] refer to Figure 1 When some blue (B) light emitted by the light source 121 can be converted into red (R) light 10 and green (G) light 20 by the light sheet 122 and pass through the light sheet 122, white light with high purity can be provided to an area of ​​the display panel 110 through the red (R) light 10, green (G) light 20 and blue (B) light 30 passing through the light sheet 122.

[0062] For convenience of explanation in the present disclosure, it is assumed that the plurality of light sources 121 included in the backlight unit 120 are implemented as blue LEDs and the optical sheet 122 is implemented as a quantum dot (QD) sheet, but the present disclosure is not limited thereto.

[0063] For example, the backlight unit 120 may include, but is not limited to, cold cathode fluorescent lamps (CCFLs) with a small calorific value, white light emitting diodes (white LEDs), etc. as the plurality of light sources 121. The backlight unit 110 may independently operate the plurality of light sources 121 and provide light to the display panel 110.

[0064] The backlight unit 110 according to an embodiment of the present disclosure can independently operate a plurality of light sources 121 and implement local dimming corresponding to an image signal. Hereinafter, various exemplary embodiments will be explained in more detail, wherein the display device 100 implements local dimming corresponding to an image signal based on the light amounts of red (R) light 10, green (G) light 20, and blue (B) light 30 provided to the display panel 110.

[0065] Figure 2 is a block diagram illustrating an example configuration of an example display device according to an embodiment of the present disclosure.

[0066] refer to Figure 2 , the display device 100 may include a display panel 110, a backlight unit (eg, backlight) 120, and a processor 130 (eg, including a processing circuit). Figure 2 Among the components shown, for Figure 1 Components that overlap with the components shown are not explained in detail again here.

[0067] The display panel 110 may include a plurality of pixels and control the brightness of each of the plurality of pixels using liquid crystals. For example, in the case of displaying a relatively dark image based on an image signal, the display panel 110 may display a low-brightness image by blocking part of the light provided by the backlight unit 120 through the liquid crystal. As another example, in the case of displaying a brighter image based on an image signal, the display panel 110 may display a high-brightness image by allowing part of the light provided by the backlight unit 120 to pass through the liquid crystal.

[0068] Since the liquid crystal of the display panel 110 is difficult to block all the light emitted by the light source 121, in order to more appropriately present low-brightness images and expand the dynamic range and improve the contrast, the backlight unit 120 can achieve local dimming by independently operating multiple light sources 121 under the control of the processor 130.

[0069] The backlight unit 120 may be divided into a plurality of light-emitting blocks, each of which may include at least one light source 121. According to an embodiment of the present disclosure, each of the plurality of light-emitting blocks may have a corresponding relationship with a different area of ​​the display panel 110. Figure 3 A more detailed explanation on this will be given.

[0070] Figure 3 is a schematic diagram showing an example of a plurality of light sources according to an embodiment of the present disclosure.

[0071] According to an embodiment of the present disclosure, the backlight unit 120 may be implemented as a direct-type backlight unit. For example, the direct-type backlight unit may be implemented as a structure in which a plurality of optical sheets and a diffusion plate are stacked under the display panel 110, and a plurality of light sources are disposed under the diffusion plate.

[0072] In the case of a direct type backlight unit, it can be divided into, for example, Figure 3 In this case, each of the plurality of light-emitting blocks may be operated separately according to the current duty value based on the image information of the corresponding screen area.

[0073] refer to Figure 3 , the backlight unit 120 may be divided into a plurality of light-emitting blocks, and each of the plurality of light-emitting blocks may include at least one light source 121. According to an embodiment of the present disclosure, a first light-emitting block including a first light source 121-1 among the plurality of light sources 121 may have a corresponding relationship with a first area 110-1 of the display panel 110. The corresponding relationship may, for example, refer to light emitted by the first light source 121-1 included in the first light-emitting block being provided to the first area 110-1 of the display panel 110.

[0074] For another example, a second light-emitting block including a second light source 121-2 among the plurality of light sources 121 may have a corresponding relationship with the second region 110-2 of the display panel 110. Therefore, light emitted by the second light source 121-2 included in the second light-emitting block may be provided to the second region 110-2.

[0075] For example, if the light source 121 is implemented as a blue LED and the light sheet 122 is implemented as a quantum dot sheet, some blue (B) light emitted by the second light source 121-2 may be converted into red (R) light 10 and green (G) light 20 by the light sheet 122 and pass through the light sheet 122, and the other light may pass through the light sheet 122 as blue (B) light 30. White light according to the red (R) light 10, the green (G) light 20, and the blue (B) light 30 may be provided to the second region 110-2 corresponding to the second light source 121-2.

[0076] The amount of blue (B) light emitted by the second light source 121-2 and the amount of white light provided to the second region 110-2 corresponding to the second light source 121-2 may be different on the display panel 110. For example, all blue (B) light emitted by the second light source 121-2 may not pass through the light sheet 122 on the second light-emitting block, but may be reflected or diffused to another light-emitting block.

[0077] refer to Figure 3 , some of the blue (B) light emitted by the second light source 121-2 may be converted into red (R) light and green (G) light by the light sheet 122, and some of the converted red (R) light and green (G) light may pass through the light sheet 122, and the other light may be reflected and diffused to another light-emitting block by the light sheet 122. For example, part of the blue (B) light emitted by the second light source 121-2 may be converted into red (R) light and green (G) light by the light sheet 122, and then reflected and diffused to the first light-emitting block by the light sheet 122. The first light-emitting block may be a light-emitting block adjacent to the second light-emitting block.

[0078] The red (R) light and the green (G) light diffused to the first light-emitting block may pass through the optical sheet 122 and may be provided to the first area 110-1 on the display panel 110. If the light emitted by the light source 121 is reflected and diffused to another light-emitting block by the optical sheet 122, the red (R) light and the green (G) light reflected by the optical sheet 122 may be provided to an area corresponding to another light-emitting block on the display panel 110. Therefore, an undesired color, such as a color that does not conform to an image signal, may be displayed in this area.

[0079] Hereinafter, various example embodiments in which the display device 100 calculates (e.g., determines or identifies) the amount of red (R), green (G), and blue (B) light irradiated to an area and adjusts an image signal corresponding to this area based on the calculated light amounts will be explained in more detail.

[0080] Back to Figure 2 The processor 130 may include various processing circuits, and the processor 130 controls the overall operation of the display device 100 .

[0081] According to an embodiment of the present disclosure, the processor 130 may be implemented as, for example but not limited to: a digital signal processor (DSP) for processing a digital image signal, a microprocessor, an artificial intelligence (AI) processor, a timing controller (T-CON), etc. However, the present disclosure is not limited thereto, and the processor 130 may include, for example but not limited to: one or more central processing units (CPUs), dedicated processors, microcontroller units (MCUs), microprocessing units (MPUs), controllers, application processors (APs), communication processors (CPs), ARM processors, etc., or may be defined by terms. The processor 130 may be implemented as a system on chip (SoC) or a large scale integration (LSI) in which a processing algorithm is stored, or in the form of a field programmable gate array (FPGA).

[0082] The processor 130 may operate the backlight unit 120 to provide light to the display panel 110. The processor 130 may adjust at least one of the feeding time or the intensity of the driving current (or driving voltage) provided to the backlight unit 120, and output the current. For example, the processor 130 may control the brightness of the light source included in the backlight unit 120 by changing the duty ratio through pulse width modulation (PWM), or control the brightness of the light source included in the backlight unit 120 by changing the intensity of the current. The pulse width modulation (PWM) signal controls the on-off ratio of the light source, and the duty ratio (%) is determined according to the dimming value input by the processor 130.

[0083] In this case, the processor 130 may be implemented as a driver IC including a device for operating the backlight unit 120. For example, the processor 130 may be implemented as a DSP, or as a digital driver IC and a chip. The driver IC may be implemented as hardware separate from the processor 130. For example, in the case where the light source included in the backlight unit 120 is implemented as an LED, the driver IC may be implemented as at least one LED driver that controls the current applied to the LED. According to an embodiment of the present disclosure, the LED driver may be provided at the rear end of a power supply (e.g., a switch mode power supply (SMPS)) and receive a voltage from the power supply. According to another embodiment, the LED driver may receive a voltage from a separate power supply device. It is possible to implement the SMPS and the LED driver as an integrated module.

[0084] The processor 130 according to an embodiment of the present disclosure may control the amount of light of each of the plurality of light sources 121 according to an image signal. For example, the processor 130 may independently operate each of the plurality of light sources 121 and turn on some of the light sources 121 and turn off other light sources to achieve local dimming. The processor 130 may control the intensity of light emitted by each light source 121 in the on state. For example, in order not to provide light to an area on the display panel 110, the processor 130 may turn off the light source 121 included in the light-emitting block corresponding to the area based on the image signal. The processor 130 may achieve local dimming by increasing the intensity and amount of light emitted by the light source 121 included in the light-emitting block corresponding to a specific area on the display panel 110 based on the image signal.

[0085] The processor 130 according to an embodiment of the present disclosure may calculate the amount of red (R), green (G), and blue (B) light emitted to one area of ​​the display panel 110 by at least one of the plurality of light sources 121 .

[0086] The processor 130 may recognize color information of this area based on each of the calculated light amounts of the R light, the G light, and the B light.

[0087] A detailed explanation of this aspect will be referred to Figure 4 To explain.

[0088] Figure 4 is a schematic diagram showing an example of local dimming according to an embodiment of the present disclosure.

[0089] refer to Figure 4 , the processor 130 may independently operate each of the plurality of light sources 121 based on the image signal to implement local dimming. For example, the processor 130 may keep the first light source 121-1 of the plurality of light sources 121 in an off state and keep the second light source 121-2 in an on state.

[0090] There may be a problem here, that is, when the first light source 121-1 is in the off state, light should not be provided to the area corresponding to the light-emitting block including the first light source 121-1 (for example, the first area 110-1 on the display panel 110), but light is provided to the first area 110-1 based on the light emitted by the adjacent light source such as the second light source 121-2.

[0091] For example, part of the blue (B) light emitted by the second light source 121-2 may be reflected by the light sheet 122 and diffused to the first light-emitting block. When the red (R) light and the green (G) light diffused to the first light-emitting block pass through the light sheet 122 and are provided to the first area 110-1, there may be a problem that the first area 110-1 presents an undesirable yellow color. Therefore, the processor 130 may calculate or predict each of the amount of R light, the amount of G light, and the amount of B light emitted to the area according to the embodiment of the present disclosure, and identify the color information of an area based on each of the calculated amounts of R light, G light, and B light. The processor 130 may adjust the image signal corresponding to this area based on the identified color information.

[0092] In the following, reference will be made to Figure 5 , Figure 6 and Figure 7 A method of calculating each of the amount of R light, the amount of G light, and the amount of B light emitted by the backlight unit 120 to one area of ​​the display panel 110 when at least one light source emits light is described in more detail.

[0093] Figure 5 2 is a schematic diagram showing the amount of blue (B) light according to an embodiment of the present disclosure.

[0094] According to an embodiment of the present disclosure, when each of the multiple light sources 121 is in an on state, the blue (B) light emitted by each of the multiple light sources 121, the reflected light reflected by the light sheet 122, the light whose wavelength is changed by the light sheet 122, etc. are all in a balanced state, and white light of the same (or similar) wavelength can be provided to each area of ​​the display panel 110.

[0095] According to an embodiment of the present disclosure, when the processor 130 turns off the light source 121-1 according to an image signal, some light emitted from a light source included in another light-emitting block is provided to the first area 11-1, wherein the first area 110-1 corresponds to a first light-emitting block including the first light source 121-1 in the turned-off state, a yellow phenomenon (hereinafter referred to as yellowing phenomenon) may occur on the first area 110-1.

[0096] The processor 130 according to an embodiment of the present disclosure may calculate a light amount of light diffused to the first region 110 - 1 corresponding to the first light-emitting block among lights emitted by the second light source 121 - 2 included in a second light-emitting block adjacent to the first light-emitting block.

[0097] Reference Figure 5According to an embodiment of the present disclosure, the blue (B) light emitted by the second light source 121-2 is diffused to several points on the light sheet 122. As the distance from the second light source 121-2 increases, the intensity of the blue (B) light reaching the light sheet 122 becomes weaker, and thus the intensity of the blue (B) light reaching each point on the light sheet 122 also changes accordingly.

[0098] The amount of blue light emitted by the backlight unit 120 to an area (eg, the first area 110-1) on the display panel 110 may correspond to, for example, a point P on the light sheet 122 corresponding to the first area 110-1. n The amount of blue (B) light 30 emitted.

[0099] If the second light source 121 - 2 is in the on state, and the light emitted by the second light source 121 - 2 is emitted in the vertical direction and reaches the point P on the light sheet 122 0 , then, at point P 0 The amount of blue (B) light on the B0 Arrival from I B0 There is a point P at a distance n n The amount of blue (B) light is I Bn In this case, I B0 and I Bn The relationship between can be expressed by formula 1.

[0100] Formula 1

[0101]

[0102] Here, d is the distance between the light source 121 and the light sheet 122 .

[0103] Arrival point P n The amount of blue (B) light I Bn Some of the light can be converted into red (R) light and green (G) light by the light sheet 122. n The amount of blue (B) light I Bn The other part of the red light may pass through the light sheet 122 as blue (B) light without changing its wavelength. According to the embodiment of the present disclosure, if the change rate of the red wavelength of the light sheet 122 is represented as C R , and the rate of change of the green wavelength is expressed as C G , then, at point P n The amount of blue (B) light passing through the light sheet I Bn_out 30 can be expressed by the following formula 2.

[0104] Formula 2

[0105] I (Bn_out) =I Bn ·(1-C R -CB )

[0106] Hereinafter, the processor 130 will calculate the n The method for determining the amount of red (R) light emitted is described in more detail.

[0107] Figure 6 is a schematic diagram showing the amount of red light (R) according to an embodiment of the present disclosure.

[0108] Reference Figure 6 According to an embodiment of the present disclosure, the blue (B) light emitted by the second light source 121 - 2 may be diffused to several points on the optical sheet 122 .

[0109] according to Figure 5 In the calculation described, the point P is reached n The amount of blue (B) light is I Bn If the change rate of the red wavelength of the light sheet 122 is expressed as C R , and arrive at point P n The amount of blue (B) light is I Bn , then, at point P n The amount of red (R) light I Rn It can be expressed by the following formula 3.

[0110] Formula 3

[0111] I Rn =I Bn ·C R

[0112] Here, the amount of red (R) light I Rn Half of the n is diffusely reflected, and the other half passes through the light sheet 122, so from point P n The amount of red (R) light emitted I Rn_out1 (10-1) can be expressed by the following formula 4.

[0113] Formula 4

[0114] I Rn_out1 =0.5·I Rn

[0115] The case where half of the light is diffusely reflected and the other half passes through the light sheet 122 is just an example, and the present disclosure is not limited to a specific number.

[0116] In addition to the case where the light emitted by the second light source 121-2 directly reaches the light sheet 122 corresponding to the first light-emitting block, the light emitted by the second light source 121-2 is reflected on the light sheet 122 corresponding to other light-emitting blocks and then reaches the light sheet 122 corresponding to the first light-emitting block (for example, point Pn ) is described in more detail.

[0117] Figure 7 is a schematic diagram showing the amount of red (R) light according to an embodiment of the present disclosure.

[0118] Figure 6 is a diagram showing that the blue (B) light emitted from the second light source 121-2 directly reaches the point P n and is converted into red (R) light by the light sheet 122 from point P n The amount of red (R) light emitted I Rn_out1 Schematic diagram of (10-1).

[0119] Figure 7 is and in Figure 6 The example shown in FIG. 1 is different from the example shown in FIG. 1 and is an example showing that the blue (B) light emitted by the second light source 121-2 is diffusely reflected on the light sheet 122 and then reaches the point P. n In the case of n The amount of red (R) light emitted I Rn_out2 Schematic diagram of (10-2).

[0120] refer to Figure 7 , the light emitted by the second light source 121-2 reaches point P 0 and point P n Some of the red (R) light whose wavelength is changed by the light sheet 122 may be diffusely reflected into the backlight unit 120 and reach the point P. n .

[0121] According to an embodiment of the present disclosure, when the blue (B) light emitted by the second light source 121-2 reaches the P on the light sheet 122, 0 and point P n A random point P between x , and then converted into red (R) light by the light sheet 122, the point P can be calculated x The amount of red (R) light on Rx .like Figure 6 The calculations described are performed as follows, Rx The calculation may be performed based on the change rate of the red wavelength of the optical sheet 122 and the light transmittance of the optical sheet 122 , and the like.

[0122] At point P x The amount of red (R) light on Rx The red (R) light may be diffusely reflected and dispersed in various directions inside the backlight block 120. The amount of red (R) light dispersed in various directions is Rx The arrival point P n The amount of light I RxnIt can be expressed by the following formula 5.

[0123] Formula 5

[0124]

[0125] Here, x may refer to, for example, a point P on the light sheet 122. 0 and point P x The distance between the points n and n may refer to, for example, a point P on the light sheet 122. 0 and point P n The distance between , and d may refer to, for example, the distance between the light source 122 and the light sheet 122 .

[0126] Depending on the material of the reflective plate inside the backlight unit 120, light may be lost when reflected. If the loss is represented by K loss , then at point P x The amount of red (R) light scattered in all directions I Rx The point P in n The amount of light I Rxn It can be expressed by the following formula 6.

[0127] Formula 6

[0128]

[0129] Finally, except for the random point P x On, still clicking P 0 and point P n Diffuse reflection occurs at several points between the two points, and diffuse reflection occurs at each point and reaches point P n The total amount of red (R) light I Rn_out2 It can be expressed by the following formula 7.

[0130] Formula 7

[0131]

[0132] For ease of explanation, based on Figure 6 and Figure 7 The different scenarios in the hypothesis are explained, but Figure 6 and Figure 7 The situations in are happening simultaneously. Therefore, from point P n The total amount of red (R) light emitted I Rn_out 10 can be expressed by the following formula 8.

[0133] Formula 8

[0134]

[0135] For ease of explanation, Figure 6 and Figure 7 Based on the total amount of red (R) light I Rn_out 10 From point P n However, the processor 130 according to the embodiment of the present disclosure can calculate the point P in the same way. n The total amount of green (G) light emitted I Gn_out 20. For example, Formula 3, Formula 4, Formula 5, Formula 6, Formula 7 and Formula 8 can be applied in the same way to calculate the n The total amount of green (G) light emitted I Gn_out 20. For example, from point P n The total amount of green (G) light emitted I Gn_out 20 can be expressed by the following formula 9.

[0136] Formula 9

[0137]

[0138] Back to Figure 2 Based on the calculated amount of red (R) light, green (G) light, and blue (B) light, the processor 130 according to an embodiment of the present disclosure may calculate color information of a region (e.g., the first region 110-1). The processor 130 may adjust the image signal corresponding to this region based on the calculated color information.

[0139] exist Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , when calculating the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted to the first area 110-1 corresponding to the first light-emitting block, only the light emitted by the second light source 121-2 included in the second light-emitting block adjacent to the first light-emitting block is considered.

[0140] According to an embodiment of the present disclosure, when a light source is in an on state, based on the distance between an area and the light source in the on state, the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted to the area can be obtained as follows: Figure 8 The following will Figure 8 The graph in Figure 2 is explained in more detail.

[0141] Figure 8 is a graph showing information regarding example light amounts of RGB according to an embodiment of the present disclosure.

[0142] refer to Figure 8 , the x-axis may refer to, for example, a light source in an on state and a point P on the light sheet n The y-axis may refer to the distance between, for example, the point Pn The amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted and provided to an area.

[0143] Back to Figure 2 , the display device 100 according to the embodiment of the present disclosure may calculate the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted to the area based on Formula 1, Formula 2, Formula 3, Formula 4, Formula 5, Formula 6, Formula 7, Formula 8, and Formula 9. At the same time, Figure 8 As shown in the graph in FIG. , the display device 100 may store information related to each of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light in advance according to the distance between at least one of the multiple light sources 121 and the area on the display panel 110.

[0144] According to an embodiment of the present disclosure, the display device 100 may store information on the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light of each, according to the distance between at least one light source in an on state among the plurality of light sources 121 and an area on the display panel 110.

[0145] When the display device 100 displays an image signal, the plurality of light sources 121 may be selectively turned on to implement local dimming. According to an embodiment of the present disclosure, the processor 130 calculates the amount of red (R) light, green (G) light, and blue (B) light provided to the region by considering at least two light sources in the turned-on state. This will be described below with reference to Fig. 9 Describe in more detail.

[0146] Fig. 9 is a schematic diagram showing an example amount of light irradiated to an area according to an embodiment of the present disclosure.

[0147] refer to Fig. 9 , the display panel 110 may be divided into a plurality of regions, and the processor 130 may implement local dimming corresponding to an image signal by independently operating a light source (or a light-emitting block) corresponding to each of the plurality of regions.

[0148] For example, it can be assumed that the light source corresponding to the first area 110-1 among the multiple areas is in the off state, and the light sources corresponding to the second area 110-2 and the third area 110-3 are in the on state. According to an embodiment of the present disclosure, the light source corresponding to the first area 110-1 is in the off state, so it should show low brightness or black, but because some light emitted by the light source corresponding to the second area 110-2 and the light source corresponding to the third area 110-3 is directly or reflected and provided to the first area 110-1, there may be a problem that the first area 110-1 presents an undesirable yellow color.

[0149] The processor 130 according to an embodiment of the present disclosure may identify the color information of an area based on the sum of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted by a first light source among the multiple light sources and irradiated to the area, and the sum of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted by a second light source among the multiple light sources and irradiated to the area.

[0150] In order to prevent and / or reduce the problem of an undesirable yellow color being presented in the first area 110-1, the processor 130 may calculate the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted by the light source corresponding to the second area 110-2 and provided to the first area 110-1. The processor 130 may calculate the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted by the light source corresponding to the third area 110-3 and provided to the first area 110-1.

[0151] In addition, the processor 130 according to an embodiment of the present disclosure may be configured based on the light amount information of each of RGB (for example, Figure 8 As shown, the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light provided to the first area 110 - 1 are calculated.

[0152] For example, if the distance between the light sources corresponding to the first area 110-1 and the second area 110-2 is 50, then based on Figure 8 As shown in the graph, the processor 130 can calculate that each of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light is 33, 40, and 55, respectively, corresponding to the distance 50. If the distance between the light sources corresponding to the first area 110-1 and the third area 110-3 is 100, based on Figure 8 As shown in the graph, the processor 130 can calculate that each of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light is 27, 32, and 26, respectively, corresponding to the distance 100. The processor 130 can calculate (or identify) each of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted by a light source at an adjacent distance to this area and provided to the area.

[0153] According to an embodiment of the present disclosure, the processor 130 may calculate that the amount of red (R) light provided to the first region 110-1 is 60 (33+27), the amount of green (G) light is 72 (40+32), and the amount of blue (B) light is 71 (45+26).

[0154] For ease of explanation, the description is based on the assumption that the effect of some light emitted by two light sources applied to a region is calculated, or the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light provided to the region from the amount of light emitted by the two light sources is calculated, but the processor 130 may also calculate each of the amounts of red (R) light, green (G) light, and blue (B) light emitted by at least three light sources and provided to the region.

[0155] For convenience of explanation, the description is made based on the assumption that two light sources emit light at the same intensity, but each of the plurality of light sources may emit light at a different intensity.

[0156] For example, if the distance between the light sources corresponding to the first area 110-1 and the second area 110-2 is 50, based on Figure 8 As shown in the graph, the processor 130 can calculate that each of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light is 33, 40, and 55, respectively, corresponding to the distance 50. If the distance between the light sources corresponding to the first area 110-1 and the third area 110-3 is 100, based on Figure 8 As shown in the graph, the processor 130 can calculate that each of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light is 27, 32, and 26, respectively, corresponding to the distance 100. If the intensity of light emitted by the light source corresponding to the third area 110-3 is twice the intensity of light emitted by the light source corresponding to the second area 110-2, the processor 130 can calculate that each of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light is 54 (27x2), 64 (32x2), and 52 (26x2), respectively.

[0157] The processor 130 may calculate that the amount of red (R) light provided to the first region 110-1 is 87 (33+54), the amount of green (G) light is 104 (40+64), and the amount of blue (B) light is 97 (45+52). A method of identifying color information of a region based on each of the calculated amounts of R light, G light, and B light will be described in more detail below.

[0158] Fig.10 is a graph showing example information of an intensity ratio of an RGB image signal for each color information according to an embodiment of the present disclosure.

[0159] The processor 130 according to an embodiment of the present disclosure may recognize color information based on conversion of the calculated amounts of R light, G light, and B light into color coordinates. The color information may refer to, for example, color temperature.

[0160] For example, the processor 130 may define the amount of light emitted to each of R, G, and B of the region as IRn_out ,I Gn_ou and I Bn_out , and add the effects of the light sources in the turned-on state, and thus calculate the RGB value.

[0161] Meanwhile, the processor 130 according to an embodiment of the present disclosure may convert R, G, and B into X, Y, and Z coordinates based on the RGB value using an RGB to XYZ conversion matrix, and obtain color coordinates or color temperature based on the X, Y, and Z coordinates. For example, the processor 130 may obtain X, Y, and Z coordinates corresponding to the calculated RGB value based on the following formula 10.

[0162] Formula 10

[0163]

[0164] The processor 130 may obtain xy values ​​corresponding to the obtained X, Y, and Z coordinates based on the following Formula 11. The processor 130 may identify color coordinates and a color temperature corresponding to the region based on the xy values.

[0165] Formula 11

[0166]

[0167] The processor 130 according to an embodiment of the present disclosure may identify whether the yellowing phenomenon occurs in the region based on the identified color temperature.

[0168] The processor 130 may adjust the ratio among the red (R), green (G), and blue (B) signals of the image signal corresponding to this area based on the color information.

[0169] According to an embodiment of the present disclosure, if all of the plurality of light sources 121 provided on the display device 100 are in an on state, then the blue (B) light emitted by each of the plurality of light sources 121, the light reflected by the optical sheet 122, the light whose wavelength is changed by the optical sheet 122, etc. are all in a balanced state, and white light of the same (or similar) wavelength can be provided to each region of the display panel 110. For example, this may be a state in which the yellowing phenomenon does not occur in each of the plurality of regions provided on the display panel 100. For example, if the color temperature of the region in which the yellowing phenomenon does not occur or all of the light sources are in an on state is assumed as a threshold temperature (e.g., 10000K), the ratio between the red (R) signal, the green (G) signal, and the blue (B) signal at the threshold temperature is 1:1:1.

[0170] Table 1

[0171] Color temperature K 16000 15000 14000 13000 12000 11000 10000 9000 8000 7000 6000 R 1.026 1.023 1.02 1.016 1.013 1.007 1 0.993 0.984 0.973 0.954 G 1 1 1 1 1 1 1 1 1 1 1 B 0.926 0.934 0.944 0.956 0.969 0.983 1 1.024 1.061 1.109 1.177

[0172] If the color temperature corresponding to the region according to the color information is higher than or equal to the threshold temperature, then the processor 130 according to the embodiment of the present disclosure may adjust the ratios among the R signal, the G signal, and the B signal so that the intensity of the B signal increases relative to the intensity of the R signal and the intensity of the G signal. For example, if the amount of blue (B) light provided to the region is greater than the amount of red (R) light and the amount of green (G) light, the color temperature of this region is higher than the threshold temperature (e.g., 10000K). In this case, the processor 130 may adjust the color temperature of this region to 10000K by reducing the ratio of blue (B) pixels, increasing the ratio of green (G) pixels, or increasing the ratio of red (R) pixels.

[0173] As another example, if the color temperature corresponding to a region according to the color information is lower than a threshold temperature, the processor 130 may adjust the ratio among the R signal, the G signal, and the B signal so that the intensity of the B signal is reduced relative to the intensity of the R signal and the intensity of the G signal. For example, if the amount of blue (B) light provided to a region is less than the amount of red (R) light and the amount of green (G) light, the color temperature of this region is lower than a threshold temperature (e.g., 10000K). In this case, the processor 130 may adjust the color temperature of this region to 10000K by increasing the ratio of blue (B) pixels or by reducing the ratio of green (G) pixels or the ratio of red (R) pixels. Fig.10 In the example, the adjustment of the green (G) pixel is reduced to reduce the change in brightness caused by the change in the pixel ratio. However, this is only an example and is not intended to limit the present disclosure.

[0174] Fig.11 is a block diagram illustrating an example display device according to an embodiment of the present disclosure.

[0175] The display device 100' according to the embodiment of the present disclosure may include a display panel 110, a backlight unit (e.g., a backlight) 120, a processor (e.g., including a processing circuit) 130, a memory 140, an input device (e.g., including an input circuit) 150, an output device (e.g., including an output circuit) 160, and a user interface (e.g., including a user interface circuit) 170. Fig.11 In the components shown, for Figure 2 Components that overlap with the components shown are not explained in detail again here.

[0176] According to an embodiment of the present disclosure, the memory 140 may store information about each of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light according to the distance between at least one light source in the turned-on state among the plurality of light sources 121 and the area of ​​the display panel 110.

[0177] The memory 140 according to the embodiment of the present disclosure may store information about the intensity ratio of the RGB image signal for each color information, as shown in Table 1 or Fig.10 The processor 130 according to an embodiment of the present disclosure may adjust the ratio among the R signal, the G signal, and the B signal of the image signal corresponding to the region based on the ratio information of the intensity of the RGB image signal for each color information stored in 140 .

[0178] The memory 140 may be electrically connected to the processor 130 and may store data required by various embodiments of the present disclosure. For example, the memory 140 may be implemented as, for example but not limited to, an internal memory such as a ROM (e.g., an electrically erasable programmable read-only memory (EEPROM)) and a RAM included in the processor 130, or as a memory separate from the processor 130, etc.

[0179] According to the usage of the stored data, the memory 140 may be implemented in the form of a memory embedded in the display device 100, or in the form of a memory that can be attached to or separated from the display device 100. For example, in the case of data for operating the display device 100, the data may be stored in the memory embedded in the display device 100, and in the case of data for the extended functions of the display device 100, the data may be stored in the memory attached to or separated from the display device 100. In the case of being implemented as a memory embedded in the display device 100, the memory 140 may be at least one of a volatile memory (e.g., dynamic RAM (DRAM), static RAM (SRAM), or synchronous dynamic RAM (SDRAM), etc.) or a non-volatile memory (e.g., one-time programmable ROM (OTPROM), programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), mask ROM, flash ROM, flash memory (e.g., NAND flash memory or NOR flash memory, etc.), a hard disk drive, or a solid state drive (SSD)).

[0180] When implemented as a memory that can be attached to or separated from the display device 100, the memory 140 can be: a memory card (such as a flash memory card (CF), a secure digital card (SD), a micro secure digital card (micro-SD), a mini secure digital card (Mini-SD), an xD card (xD), a multimedia card (MMC), etc.), an external memory that can be connected to a USB port (for example, a USB memory), etc.

[0181] The input device 150 may include various input circuits and receive various types of input content. For example, the input device 150 may receive an image signal from an external device (e.g., a source device), an external storage medium (e.g., a USB memory), an external server (e.g., a network hard disk) by a streaming or downloading method through a communication means (e.g., Wi-Fi (Wi-Fi, wireless LAN network) based on AP, Bluetooth, Zigbee, wired / wireless local area network (LAN), wide area network (WAN), Ethernet, IEEE1394, High Definition Multimedia Interface (HDMI), Universal Serial Bus (USB), Mobile High Definition Link (MHL), American Audio Engineering Society / European Broadcasting Union (AES / EBU), optical and coaxial methods). Here, the image signal may be a digital image signal in a standard definition (SD) image, a high definition (HD) image, a full HD image, or an ultra-high definition image, but is not limited thereto.

[0182] The output 160 may include various output circuits and may output an audio signal. For example, the output 160 may convert a digital audio signal processed by the processor 130 into an analog audio signal, amplify the signal and output the signal. For example, the output 160 may include at least one speaker unit, a D / A converter, an audio amplifier, etc. that can output at least one channel. According to an embodiment of the present disclosure, the output 160 may be implemented to output various multi-channel audio signals. In this case, the processor 130 may control the output 160 to perform enhanced processing on the audio signal input to correspond to the enhanced processing performed on the input image, and output the signal. For example, the processor 130 may convert an input dual-channel audio signal into a virtual multi-channel (e.g., 5.1 channel) audio signal, or identify the position of the display device 100' and process the signal into a stereo audio signal optimized for the space, or provide an audio signal optimized according to the type of the input image (e.g., the type of content).

[0183] The user interface 170 may include various user interface circuits and may be implemented as a device that can perform the above-mentioned display function and manipulation input function, such as a button, a touch pad, a mouse, a keyboard, a touch screen, a remote control transceiver, etc. The remote control transceiver may receive a remote control signal from an external remote control device or send a remote control signal through at least one communication method of infrared communication, Bluetooth communication, or Wi-Fi communication.

[0184] According to an implementation example, the display device 100' may further include a tuner and a demodulation part. The tuner (not shown) can receive a radio frequency broadcast signal by tuning a channel, which is selected by a user from a radio frequency (RF) broadcast signal received through an antenna or all previously stored channels. The demodulation part (not shown) can receive a digital IF signal (DIF) converted by the tuner and demodulate the signal, as well as perform channel demodulation, etc. According to an embodiment of the present disclosure, the input image received by the tuner can be processed by the demodulation part (not shown) and then provided to the processor 130 for image processing according to an embodiment of the present disclosure.

[0185] Fig.12 is a flowchart illustrating an example method of controlling a display device according to an embodiment of the present disclosure.

[0186] In a method for controlling a display device according to an embodiment of the present disclosure, the display device includes a backlight unit (the backlight unit includes multiple light sources) and independently operates a light-emitting block corresponding to each of the multiple light sources to provide light to a display panel. At operation S1210, the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted by at least one of the multiple light sources to an area on the display panel is calculated.

[0187] At operation S1220, color information of this area is recognized according to each of the calculated amounts of R light, G light, and B light.

[0188] At operation S1230, the image signal corresponding to this area is adjusted based on the recognized color information.

[0189] Operation S1220 of identifying color information may include: identifying the color information of an area based on the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted by a first light source among multiple light sources and irradiating this area, and the sum of the amount of red (R) light, the amount of green (G) light, and the amount of blue (B) light emitted by a second light source among multiple light sources and irradiating this area.

[0190] The operation S1220 of recognizing the color information may include recognizing the color information according to converting each of the calculated amounts of the R light, the G light, and the B light into color coordinates.

[0191] The color information may include color temperature.

[0192] According to an embodiment of the present disclosure, the region may be a region corresponding to at least one of a plurality of light-emitting blocks, or a region corresponding to at least one of a plurality of pixels on a display panel.

[0193] The operation S1230 of adjusting the image signal may include adjusting a ratio among a red (R) signal, a green (G) signal, and a blue (B) signal of the image signal corresponding to the area according to the recognized color information.

[0194] Operation S1230 of adjusting the image signal may include: adjusting the ratio among the R signal, the G signal, and the B signal based on the color temperature according to the identified color information being higher than or equal to a threshold temperature so that the intensity of the B signal is increased relative to the intensity of the R signal and the G signal, and adjusting the ratio among the R signal, the G signal, and the B signal based on the color temperature according to the identified color information being lower than the threshold temperature so that the intensity of the B signal is reduced relative to the intensity of the R signal and the intensity of the G signal.

[0195] The operation S1230 of adjusting the image signal according to an embodiment of the present disclosure may include: reading the ratio of the RGB image signal intensity corresponding to the identified color information from a memory storing information about the intensity ratio of the RGB image signal for each color information, and adjusting the ratio between the R signal, G signal and B signal of the image signal corresponding to this area.

[0196] Various exemplary embodiments of the present disclosure are applicable not only to display devices but also to all electronic devices capable of performing image processing, for example, image receiving devices (such as but not limited to set-top boxes), image processing devices, and the like.

[0197] The various example embodiments described above can be implemented in a recording medium read by a computer or a computer-like device using software, hardware, or a combination thereof. In some cases, the embodiments described in this disclosure can be implemented by the processor 120 itself. According to software implementation, the embodiments such as processes and functions described in this disclosure can be implemented by separate software modules. Each software module can perform one or more functions and operations described in this specification.

[0198] According to the various exemplary embodiments of the present disclosure described above, computer instructions for executing processing operations of a display device may be stored in a non-transitory computer-readable medium. When the computer instructions stored in the non-transitory computer-readable medium are executed by a processor of a specific machine, these computer instructions cause the specific machine to execute processing operations on the display device according to the various exemplary embodiments described above.

[0199] The non-transitory computer-readable medium may refer to a medium that stores data semi-permanently and can be read by a machine, for example. Examples of the non-transitory computer-readable medium include CD, DVD, hard disk, Blu-ray disk, USB, memory card, ROM, etc.

[0200] Although various exemplary embodiments of the present disclosure have been shown and described, the present disclosure is not limited to the above-described embodiments, and persons having basic knowledge in the art will understand that various changes in form and details may be made without departing from the spirit and scope of the present disclosure, including the appended claims.

Claims

1. A display device, comprising: a display panel including a plurality of pixels and configured to display an image based on an image signal; a backlight including a plurality of light sources and configured to independently operate a light-emitting block corresponding to each of the plurality of light sources to provide light to the display panel; as well as a processor configured to control a light amount of each of the plurality of light sources based on the image signal, Wherein, the processor is configured as follows: Calculating, based on a distance between the at least one light source and an area and an intensity of the at least one light source, an amount of red R light, an amount of green G light, and an amount of blue B light that at least one of the plurality of light sources is configured to emit to an area on the display panel, wherein the one area includes an area corresponding to at least one of the plurality of light-emitting blocks or an area corresponding to at least one of the plurality of pixels of the display panel; identifying color information of the one area based on a sum of an amount of red R light, an amount of green G light, and an amount of blue B light configured to be emitted to the one area by a first light source among the plurality of light sources and an amount of red R light, an amount of green G light, and an amount of blue B light configured to be emitted to the one area by a second light source among the plurality of light sources, and based on conversion of each of the calculated amounts of R light, G light, and B light into color coordinates, wherein the color information includes a color temperature; and The image signal corresponding to the one area is adjusted by adjusting a ratio among a red R signal, a green G signal, and a blue B signal of the image signal corresponding to the one area based on the recognized color information.

2. The display device according to claim 1, The processor is configured as follows: Based on the color temperature according to the identified color information being higher than or equal to a threshold temperature, adjusting the ratio among the R signal, the G signal, and the B signal so that the intensity of the B signal is increased relative to the intensity of the R signal and the intensity of the G signal, and Based on the color temperature according to the recognized color information being lower than a threshold temperature, the ratio among the R signal, the G signal and the B signal is adjusted so that the intensity of the B signal is reduced relative to the intensity of the R signal and the intensity of the G signal.

3. The display device according to claim 1, further comprising: a memory storing information on a ratio of an intensity of an R signal, an intensity of a G signal, and an intensity of a B signal for each color information, The processor is configured as follows: Based on the information stored in the memory and the recognized color information, a ratio among the R signal, the G signal, and the B signal of the image signal corresponding to the one area is adjusted.

4. The display device according to claim 1, further comprising: a memory including information on a light amount of each of the R light, the G light, and the B light according to a distance between the at least one light source among the plurality of light sources and the display panel, The processor is configured as follows: Based on the information about the light amount stored in the memory, the amount of the red R light, the amount of the green G light, and the amount of the blue B light based on the distance between the at least one light source and the one area are calculated.

5. The display device according to claim 4, in, The backlight further includes a light sheet separately arranged on the upper part of the plurality of light sources, Information about the amount of light includes: Information calculated based on a first amount of light emitted by the at least one light source that reaches the area of ​​the light sheet and a second amount of light emitted by the at least one light source that reflects onto the light sheet and reaches the area of ​​the light sheet.

6. The display device according to claim 4, in, The backlight includes a light sheet, and Each of the plurality of light sources comprises a blue LED, and The optical sheet includes a quantum dot sheet.

7. A method for controlling a display device, wherein: The display device includes a backlight having a plurality of light sources, and the backlight is configured to independently operate a light-emitting block corresponding to each of the plurality of light sources to provide light to a display panel, and the method includes: calculating an amount of red R light, an amount of green G light, and an amount of blue B light that at least one of the plurality of light sources is configured to emit to an area on the display panel; identifying color information of the one area based on a sum of an amount of red R light, an amount of green G light, and an amount of blue B light configured to be emitted to the one area by a first light source among the plurality of light sources and an amount of red R light, an amount of green G light, and an amount of blue B light configured to be emitted to the one area by a second light source among the plurality of light sources, and based on conversion of each of the calculated amounts of R light, G light, and B light into color coordinates, wherein the color information includes a color temperature; and The image signal corresponding to the one area is adjusted by adjusting a ratio among a red R signal, a green G signal, and a blue B signal of the image signal corresponding to the one area according to the recognized color information.

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