Display device and gamma voltage setting method for display device

Abstract

The invention relates to a gamma voltage setting method of a display device and the display device. The gamma voltage setting method of the display device includes: supplying data corresponding to a specific gray level of a specific dimming level to a data driver; generating a data signal corresponding to the data in the data driver using a gamma voltage corresponding to the processing gamma value; displaying an image corresponding to the data signal in the pixel unit; determining the temperature of the pixel unit; loading target brightness and target color coordinates corresponding to the specific dimming level, the specific gray level and the temperature of the pixel unit from the lookup table; generating a gamma value, so that an image corresponding to the target brightness and the target color coordinate is displayed in the pixel unit; and storing the gamma value.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2023-0135343 filed on October 11, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. Technical Field

[0003] The present disclosure generally relates to a display device and a gamma voltage setting method of the display device. Background Art

[0004] As information technology develops, the importance of display devices as a connection medium between users and information increases. Therefore, display devices such as liquid crystal display devices and organic light emitting display devices are increasingly used.

[0005] The display device can be supplied with data from the host and convert the data into a data signal to be supplied to the pixel, thereby displaying a predetermined image in a pixel unit. The display device can generate a data signal using a gamma voltage. At the same time, the brightness and color coordinates of the image displayed in the pixel unit can change according to the temperature of the display device, and therefore, when the gamma voltage is set for the first time (or during the manufacturing process), the temperature characteristics need to be reflected. Summary of the invention

[0006] Embodiments provide a display device in which a gamma voltage may be set in consideration of temperature characteristics and a gamma voltage setting method of the display device.

[0007] According to one aspect of the present disclosure, a gamma voltage setting method for a display device is provided, the gamma voltage setting method comprising: supplying data corresponding to a specific grayscale of a specific dimming level to a data driver; generating a data signal corresponding to the data in the data driver using a gamma voltage corresponding to a processed gamma value; displaying an image corresponding to the data signal in a pixel unit; determining the temperature of the pixel unit; loading a target brightness and a target color coordinate corresponding to the specific dimming level, the specific grayscale and the temperature of the pixel unit from a lookup table; generating a gamma value so that an image corresponding to the target brightness and the target color coordinates is displayed in the pixel unit; and storing the gamma value.

[0008] The gamma value may be stored in the display device during a manufacturing process of the display device.

[0009] The gamma values ​​may include a first gamma value corresponding to a pixel of a first color, a second gamma value corresponding to a pixel of a second color, and a third gamma value corresponding to a pixel of a third color.

[0010] A plurality of dimming levels, a plurality of gray levels included in each of the plurality of dimming levels, and target brightness and target color coordinates corresponding to at least two different temperatures in each of the plurality of gray levels may be stored in a lookup table.

[0011] The gamma voltage setting method may further include sensing whether the image corresponding to the target brightness and the target color coordinates is displayed in the pixel unit using a camera.

[0012] According to another aspect of the present disclosure, a gamma voltage setting method for a display device is provided, the gamma voltage setting method comprising: supplying data corresponding to a specific grayscale of a specific dimming level to a data driver; generating a data signal corresponding to the data in the data driver using a gamma voltage corresponding to a processed gamma value; displaying an image in a pixel unit corresponding to the data signal; determining a temperature of the pixel unit; loading a gamma value corresponding to the specific dimming level, the specific grayscale and the temperature of the pixel unit from a lookup table; and storing the gamma value.

[0013] The gamma value may be stored in the display device during a manufacturing process of the display device.

[0014] The gamma values ​​may include a first gamma value corresponding to a pixel of a first color, a second gamma value corresponding to a pixel of a second color, and a third gamma value corresponding to a pixel of a third color.

[0015] A plurality of dimming levels, a plurality of gray levels included in each of the plurality of dimming levels, and the gamma values ​​corresponding to at least two different temperatures in each of the plurality of gray levels may be stored in the lookup table.

[0016] According to another aspect of the present disclosure, a display device is provided, the display device comprising: a pixel unit including pixels connected to a scan line and a data line; a data driver configured to supply a data signal to the data line; a gamma voltage supplier configured to supply a gamma voltage to the data driver corresponding to a gamma value; a timing controller including a storage unit and a lookup table, the storage unit being configured to store the gamma value; and a temperature sensor configured to sense the temperature of the pixel unit, wherein a plurality of dimming levels, a plurality of gray levels included in each of the plurality of dimming levels, and gamma value setting information corresponding to at least two different temperatures in each of the plurality of gray levels are stored in the lookup table, and wherein the gamma value setting information corresponds to a target brightness and a target color coordinate of the pixel unit corresponding to the at least two different temperatures, or corresponds to the gamma value corresponding to the at least two different temperatures.

[0017] The gamma values ​​may include a first gamma value corresponding to a pixel of a first color, a second gamma value corresponding to a pixel of a second color, and a third gamma value corresponding to a pixel of a third color.

[0018] The timing controller can display an image corresponding to a specific grayscale of a specific dimming level in the pixel unit during a manufacturing process, and store the gamma value corresponding to the specific grayscale of the specific dimming level and the target brightness and target color coordinates corresponding to the temperature of the pixel unit measured from the temperature sensor in the storage unit.

[0019] The timing controller can display an image corresponding to a specific grayscale level of a specific dimming level in the pixel unit during a manufacturing process, load the gamma value corresponding to the specific grayscale level of the specific dimming level and the temperature of the pixel unit measured from the temperature sensor from the lookup table, and store the gamma value in the storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, example embodiments may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art.

[0021] In the accompanying drawings, dimensions may be exaggerated for clarity of illustration. It will be understood that when an element is referred to as being "between" two elements, it may be the only element between the two elements, or one or more intervening elements may also be present. The same reference numerals always refer to the same elements.

[0022] Figure 1 is a diagram illustrating a display device according to an embodiment of the present disclosure.

[0023] Figure 2A and Figure 2B is a diagram illustrating the location of a temperature sensor according to an embodiment of the present disclosure.

[0024] Figure 3 is a diagram showing a state in which a control device for setting a gamma value during a manufacturing process is attached to a display device.

[0025] Figure 4 It is shown that the Figure 3 A diagram of an embodiment of a lookup table in a control device is shown in FIG.

[0026] Figure 5 is a flow chart illustrating an embodiment of a process of setting a gamma value (or gamma voltage).

[0027] Figure 6 It is shown that the Figure 3 A diagram of an embodiment of a lookup table in a control device is shown in FIG.

[0028] Figure 7 It is shown that the use Figure 6 Flow chart of an embodiment of a process for setting a gamma value using a lookup table as shown in FIG.

[0029] Figure 8 is a diagram illustrating a display device according to an embodiment of the present disclosure.

[0030] Fig. 9 It is shown Figure 1 An embodiment of a pixel is shown in FIG.

[0031] Fig.10 It is shown Fig. 9 FIG. 4 is a diagram of an exemplary driving method of a pixel shown in FIG. DETAILED DESCRIPTION

[0032] Hereinafter, exemplary embodiments are described in detail with reference to the accompanying drawings so that those skilled in the art can easily practice the present disclosure. The present disclosure can be implemented in various different forms and is not limited to the exemplary embodiments described in this specification.

[0033] In order to clearly describe the present disclosure, parts irrelevant to the description will be omitted, and the same or similar constituent elements will be represented by the same reference numerals throughout the specification. Therefore, the same reference numerals may be used in different drawings to identify the same or similar elements.

[0034] In the description, the expression "equal" may mean "substantially equal." That is, it may mean equal to a degree that can be understood by those skilled in the art. Other expressions may be expressions in which "substantially" is omitted.

[0035] Some embodiments are described in the accompanying drawings according to functional blocks, units and / or modules. It will be appreciated by those skilled in the art that these blocks, units and / or modules can be physically implemented by logic circuits, discrete components, microprocessors, hard-wired circuits, storage elements, wiring connections and other electronic circuits. This can be formed by using semiconductor-based manufacturing techniques or other manufacturing techniques. In the case of blocks, units and / or modules implemented by microprocessors or other similar hardware, blocks, units and / or modules can be programmed and controlled using software to perform the various functions discussed in the present disclosure, and can be selectively driven by firmware and / or software. In addition, each block, each unit and / or each module can be implemented by a combination of dedicated hardware or dedicated hardware that performs some functions of blocks, units and / or modules and processors (e.g., one or more programmed microprocessors and related circuits) that perform other functions of blocks, units and / or modules. In some embodiments, without departing from the scope of the present disclosure, blocks, units and / or modules can be physically separated into two or more separate blocks, two or more separate units and / or two or more separate modules. Furthermore, in some embodiments, blocks, units and / or modules may be physically separated into more complex blocks, more complex units and / or more complex modules without departing from the scope of the present disclosure.

[0036] The term "connection" between two components may include both electrical connection and physical connection, but the present disclosure is not necessarily limited thereto. For example, the term "connection" used based on a circuit diagram may mean electrical connection, and the term "connection" used based on a cross-sectional view and a plan view may mean physical connection.

[0037] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, without departing from the teachings of the present disclosure, the "first" element discussed below may also be referred to as the "second" element.

[0038] Meanwhile, the present disclosure is not limited to the embodiments disclosed below, and can be implemented in various forms. Each embodiment disclosed below can be implemented independently, or can be combined with at least one other embodiment before being implemented.

[0039] Figure 1 is a diagram illustrating a display device according to an embodiment of the present disclosure.

[0040] refer to Figure 1The display device 100 according to an embodiment of the present disclosure may include a pixel unit 110 (or a display panel), a timing controller 120, a scan driver 130, an emission driver 140, a data driver 150, a gamma voltage supplier 160, a power source 170, and a temperature sensor TES. The timing controller 120, the scan driver 130, the emission driver 140, the data driver 150, the gamma voltage supplier 160, the power source 170, and the temperature sensor TES may constitute a driving device for driving the pixel unit 110.

[0041] The pixel unit 110 may display an image. The pixel unit 110 may be any one of an organic light emitting display panel, a liquid crystal display panel, an electrophoretic display panel, and an inorganic light emitting display panel. The pixel unit 110 may include pixels PX connected to scan lines SL0, SL1, SL2, ..., and SLn, data lines DL1, DL2, ..., and DLm, emission control lines EL1, EL2, EL3, ..., and ELo, and power lines PL1 and PL2 (n, m, and o are each a natural number of 2 or more).

[0042] The pixels PX may be disposed in an area defined by the scan lines SL0 to SLn, the data lines DL1 to DLm, and the emission control lines EL1 to ELo. Each pixel PX may be connected to any one of the scan lines SL0 to SLn, any one of the data lines DL1 to DLm, and any one of the emission control lines EL1 to ELo. For example, a pixel PXij located on the i-th row and the j-th column (see Fig. 9 ) can be connected to the i-1th scan line SLi-1, the i-th scan line SLi, the j-th data line DLj (hereinafter, also referred to as the data line DLj) and the k-th emission control line ELk (hereinafter, also referred to as the emission control line ELk). Wherein, i can be a natural number equal to or greater than 1 and equal to or less than n, j can be a natural number equal to or greater than 1 and equal to or less than m, and k can be a natural number equal to or greater than 1 and equal to or less than o.

[0043] Here, k may be a natural number equal to or less than i. In an example, when each of the emission control lines EL1 to ELo is connected to the pixels PX located on one horizontal line, k may be a natural number equal to i. In an example, when each of the emission control lines EL1 to ELo is connected to the pixels PX located on two or more horizontal lines, k may be a natural number less than i.

[0044] Each pixel PX may be electrically connected between a first power line PL1 and a second power line PL2. A voltage of a first power source VDD may be applied to the first power line PL1, and a voltage of a second power source VSS may be applied to the second power line PL2. The voltage of the first power source VDD and the voltage of the second power source VSS may be power source voltages or driving voltages required for the operation of the pixel PX, and during the light emission of the pixel PX, the first power source VDD may have a voltage level higher than a voltage level of the second power source VSS.

[0045] When a scan signal (or an enable scan signal) is supplied to a scan line connected to each pixel PX, a data signal may be supplied to the pixel PX from a data line connected to the pixel PX. The pixel PX supplied with a data signal may emit light of a brightness corresponding to the data signal to the outside. To this end, the pixel PX may include a pixel of a first color, a pixel of a second color, and a pixel of a third color. The first color, the second color, and the third color may be different colors. In an example, the first color may be red, the second color may be green, and the third color may be blue. In another example, the first color may be rose red, the second color may be cyan, and the third color may be yellow.

[0046] In addition, the signal lines (e.g., scan lines, data lines, and emission control lines) connected to each pixel PX and the driving method of the pixel PX can be changed corresponding to the structure of the pixel PX. In an example, the emission control line can be removed corresponding to the structure of the pixel PX. In an embodiment of the present disclosure, the pixel PX can be selected as any of various pixels currently known in the art.

[0047] The scan driver 130 may generate a scan signal in response to a scan drive signal SCS from the timing controller 120, and sequentially supply the scan signal to the scan lines SL0 to SLn. In an example, the timing controller 120 may supply the scan drive signal SCS including a scan start signal, a clock signal, etc. to the scan driver 130. The scan driver 130 may be implemented as a shift register that sequentially generates and outputs the scan signal while shifting the scan start signal according to the clock signal.

[0048] The emission driver 140 may generate an emission control signal in response to an emission driving signal ECS from the timing controller 120, and sequentially supply the emission control signal to the emission control lines EL1 to ELo. In an example, the timing controller 120 may supply the emission driving signal ECS including an emission start signal, a clock signal, etc. to the emission driver 140. The emission driver 140 may be implemented as a shift register that sequentially generates and outputs the emission control signal while shifting the emission start signal according to the clock signal.

[0049] The scan driver 130 and the emission driver 140 may be formed together with the pixel PX in the pixel unit 110. However, the present disclosure is not limited thereto. For example, the scan driver 130 and / or the emission driver 140 may be mounted on a circuit film and may be connected to the timing controller 120 via at least one circuit film and at least one printed circuit board.

[0050] The data driver 150 may be supplied with a data driving signal DCS and output data Dout from the timing controller 120. The data driving signal DCS may include a sampling signal and / or a timing signal required to drive the data driver 150. In addition, the gamma voltages VGR, VGG, and VGB may be supplied to the data driver 150 from the gamma voltage supplier 160.

[0051] The data driver 150 may select any one of the gamma voltages VGR, VGG, and VGB corresponding to the grayscale level of the output data Dout, thereby generating a data signal. The data driver 150 may supply the data signal to the pixel unit 110 one pixel row (or horizontal line) at a time. One pixel row may refer to a row in which pixels connected to the same scan line are arranged.

[0052] The gamma values ​​GMR, GMG, and GMB may be supplied from the timing controller 120 to the gamma voltage supplier 160. The gamma values ​​GMR, GMG, and GMB may include a first gamma value GMR, a second gamma value GMG, and a third gamma value GMB.

[0053] The first gamma value GMR may include a plurality of data (or signals) and have a gamma value corresponding to a pixel of a first color. The second gamma value GMG may include a plurality of data (or signals) and have a gamma value corresponding to a pixel of a second color. The third gamma value GMB may include a plurality of data (or signals) and have a gamma value corresponding to a pixel of a third color.

[0054] The gamma voltage supplier 160 may supply a first gamma voltage VGR corresponding to a first gamma value GMR to the data driver 150. The first gamma voltage VGR may include a gamma voltage corresponding to each gray level (eg, 256 gray levels), and the data driver 150 may generate a data signal to be supplied to pixels of a first color using the first gamma voltage VGR.

[0055] The gamma voltage supplier 160 may supply a second gamma voltage VGG corresponding to the second gamma value GMG to the data driver 150. The second gamma voltage VGG may include a gamma voltage corresponding to each gray level (e.g., 256 gray levels), and the data driver 150 may generate a data signal to be supplied to the pixel of the second color using the second gamma voltage VGG.

[0056] The gamma voltage supplier 160 may supply a third gamma voltage VGB corresponding to the third gamma value GMB to the data driver 150. The third gamma voltage VGB may include a gamma voltage corresponding to each gray level (e.g., 256 gray levels), and the data driver 150 may generate a data signal to be supplied to pixels of the third color using the third gamma voltage VGB.

[0057] exist Figure 1 , the gamma voltage supplier 160 and the data driver 150 are shown as components separated from each other. However, the embodiments of the present disclosure are not limited thereto. In an example, the gamma voltage supplier 160 and the data driver 150 may be embedded in one integrated circuit.

[0058] The timing controller 120 may receive input data Din and a control signal CS from a host system through an interface. In an example, the timing controller 120 may receive input data Din and a control signal CS from at least one of a graphics processing unit (GPU), a central processing unit (CPU), and an application processor (AP) included in the host system. Various signals including a clock signal may be included in the control signal CS.

[0059] The timing controller 120 may generate a scan driving signal SCS, a data driving signal DCS, and an emission driving signal ECS based on the control signal CS. The scan driving signal SCS, the data driving signal DCS, and the emission driving signal ECS may be supplied to the scan driver 130, the data driver 150, and the emission driver 140, respectively.

[0060] The timing controller 120 may rearrange the input data Din to be suitable for the specification of the display device 100. In addition, the timing controller 120 may generate output data Dout by correcting the input data Din, and supply the output data Dout to the data driver 150. In an embodiment, the timing controller 120 may correct the input data Din corresponding to an optical measurement result measured during a manufacturing process.

[0061] The storage unit 122 may be provided inside the timing controller 120. Gamma values ​​GMR, GMG, and GMB corresponding to the gamma voltages may be stored in the storage unit 122. In an example, the gamma values ​​GMR, GMG, and GMB may be stored during a manufacturing process. The value of each of the gamma values ​​GMR, GMG, and GMB may be set in consideration of the temperature of the display device 100, and thus, an image may be stably displayed regardless of the temperature.

[0062] The power source 170 may generate various power supplies required to drive the display device 100. In an example, the power source 170 may generate a first power supply VDD and a second power supply VSS. The power source 170 may also generate various power supplies (e.g., initialization power supplies) corresponding to the structure of the pixel PX. The first power supply VDD may be a power supply that supplies a driving current to the pixel PX. The second power supply VSS may be a power supply that supplies a driving current from the pixel PX. During a period in which the pixel PX is set to an emission state, the voltage of the first power supply VDD may be set to a voltage higher than the voltage of the second power supply VSS.

[0063] The voltage of the first power source VDD generated by the power source 170 may be supplied to the first power line PL1, and the voltage of the second power source VSS generated by the power source 170 may be supplied to the second power line PL2. The first power line PL1 and the second power line PL2 may be commonly connected to the pixel PX, but the embodiments of the present disclosure are not limited thereto. In an embodiment, the first power line PL1 may include a plurality of power lines, and the plurality of power lines may be connected to different pixels PX. In an embodiment, the second power line PL2 may include a plurality of power lines, and the plurality of power lines may be connected to different pixels PX.

[0064] The temperature sensor TES may sense the temperature of the pixel unit 110 and supply a temperature value TV corresponding to the sensed temperature to the timing controller 120. The timing controller 120 may change the gamma values ​​GMR, GMG, and GMB corresponding to the temperature value TV.

[0065] Figure 2A and Figure 2B is a diagram illustrating the location of a temperature sensor according to an embodiment of the present disclosure.

[0066] refer to Figure 1 and Figure 2A , the temperature sensor TES may be disposed to overlap the pixel unit 110. In an example, the temperature sensor TES may be located at a central portion of the pixel unit 110, and supply a temperature value TV corresponding to the temperature of the central portion of the pixel unit 110 to the timing controller 120. The timing controller 120 may calculate the temperature of the entire pixel unit 110 based on the temperature value TV.

[0067] refer to Figure 1 and Figure 2B, at least two temperature sensors TES may be provided at the outer portion of the pixel unit 110. In an example, the temperature sensors TES may be provided at the outer portions of the pixel unit 110, respectively, and supply a temperature value TV corresponding to the temperature of the outer portion of the pixel unit 110 to the timing controller 120. The timing controller 120 may calculate the temperature of the entire pixel unit 110 based on the temperature value TV (average the temperature of the entire pixel unit 110).

[0068] Figure 3 is a diagram showing a state in which a control device for setting a gamma value during a manufacturing process is attached to a display device. Figure 4 It is shown that the Figure 3 A diagram of an embodiment of a lookup table in a control device is shown in FIG. Figure 5 2 is a flowchart illustrating an embodiment of a process of setting a gamma value (or a gamma voltage). The gamma value may be set for each display device 100 through multi-time programming (MTP).

[0069] refer to Figure 3 , the control device 200 for setting the gamma value may be electrically connected to the timing controller 120 so that the gamma value (or gamma voltage) is set during the manufacturing process.

[0070] The control device 200 may be connected to the camera 202. The camera 202 may sense an image displayed in the pixel unit 110 and supply the image to the control device 200. The control device 200 may determine the brightness and color coordinates of the pixel unit 110 by using the image supplied from the camera 202.

[0071] The control device 200 may include a lookup table LUT, and information for setting the gamma value may be stored in the lookup table LUT. In an example, the lookup table LUT may include: Figure 4 , and each of the dimming levels DEV1, ..., and DEVp (p is a natural number of 2 or more), and each of the dimming levels DEV1, ..., and DEVp may include a plurality of gray levels (e.g., 10Gray, 60Gray, ..., and 255Gray). In addition, the brightness and color coordinate information to be displayed in the pixel unit 110 when each of the plurality of gray levels is driven at at least two different temperatures (e.g., 0°C, 10°C, ..., 40°C, 50°C, ...) may be stored in the lookup table LUT.

[0072] The lookup table LUT may include the maximum brightness that can be emitted from the pixel unit 110 according to the dimming levels DEV1, ..., and DEVp. For example, as the dimming levels DEV1, ..., and DEVp increase, the maximum brightness that can be emitted from the pixel unit 110 may also increase. The maximum brightness may be the brightness measured when the entire pixel unit 110 emits light at the maximum grayscale set in the display device 100.

[0073] The plurality of gray levels included in each of the dimming levels DEV1, . . . , and DEVp may mean a gray level displayed in the pixel unit 110 when the gamma value is set. The plurality of gray levels may be pre-stored in the lookup table LUT so that the gamma value is stably set. Figure 4 The plurality of gray levels shown in are merely illustrative, and the gray level included in each of the dimming levels DEV1, . . . , and DEVp may be set differently.

[0074] The multiple temperatures included in each grayscale may mean the temperature of the pixel unit 110 (or the temperature of the display device 100). In addition, the brightness and color coordinate information (or gamma value setting information) corresponding to each of the multiple temperatures may mean the target brightness and target color coordinate information of the image displayed in the pixel unit 110 when the display device 100 is driven at a specific dimming level, a specific grayscale, and a specific temperature. Figure 4 The multiple temperatures shown in are merely illustrative, and the temperatures stored in the lookup table LUT may be set differently.

[0075] When temperature information is included in the lookup table LUT, the gamma value (or gamma voltage) can be set in consideration of the temperature information (or temperature characteristics) during the manufacturing process. In this way, when the temperature characteristics are reflected on the gamma value, the display quality of the display device 100 can be improved and the processing time can be shortened.

[0076] More specifically, when the temperature information is not included in the lookup table LUT, the gamma value may be set to room temperature. Since the temperature of the process line will be set to room temperature, a predetermined time may be required. In addition, the temperature of the pixel unit 110 may change during the setting of the gamma value, and since the temperature characteristics are not reflected in the gamma value, the desired brightness (and the desired color coordinates) may not be displayed in the display device 100.

[0077] refer to Figure 3 , Figure 4 and Figure 5, power may be supplied to the display device 100 during the manufacturing process to set the gamma value (S402). After power is input to the display device 100, the control device 200 may supply processing data (or data) corresponding to the dimming level DEV and the grayscale Gray and a processing gamma value to the timing controller 120. The processing gamma value may be an initial gamma value that does not reflect the characteristics of the display device 100.

[0078] Processing data may be supplied to the data driver 150 via the timing controller 120, and processing gamma values ​​may be supplied to the gamma voltage supplier 160 via the timing controller 120. The gamma voltage supplier 160 supplied with the processing gamma values ​​may supply the data driver 150 with gamma voltages VGR, VGG, and VGB corresponding to the processing gamma values.

[0079] The data driver 150 supplied with the processed data may generate a data signal using the gamma voltages VGR, VGG, and VGB, and may supply the data signal to the pixel unit 110. An image corresponding to a specific dimming level and a specific grayscale may be displayed in the pixel unit 110 (S404).

[0080] When a predetermined image is displayed in the pixel unit 110, the temperature sensor TES may sense the temperature of the pixel unit 110 and supply a temperature value TV corresponding to the sensed temperature to the timing controller 120 (S406). The timing controller 120 may supply the temperature value TV to the control device 200. Then, the control device 200 may load the brightness and color coordinates corresponding to the temperature from the lookup table LUT (S408).

[0081] In an example, when the processing data corresponding to the first dimming level DEV1 and 255 Gray is supplied, and the temperature value TV corresponds to 40° C., the control device 200 may load 1000 nits of brightness and color coordinates of x=0.313 and y=0.329 in step S408. In an example, when the processing data corresponding to the first dimming level DEV1 and 255 Gray is supplied, and the temperature value TV corresponds to 50° C., the control device 200 may load 1500 nits of brightness and color coordinates of x=0.320 and y=0.335 in step S408.

[0082] The predetermined image displayed in the pixel unit 110 may be captured by the camera 202 and supplied to the control device 200. The control device 200 may determine the brightness and color coordinates of the predetermined image displayed in the pixel unit 110 by using the captured image supplied from the camera 202. Thereafter, the control device 200 may change the processing gamma value so that the image of the brightness and color coordinates loaded in the pixel unit 110 in step S408 may be displayed in the pixel unit 110 (S410). In addition, when the image of the brightness and color coordinates loaded in step S408 in the pixel unit 110 is displayed in the pixel unit 110 as the gamma values ​​GMR, GMG, and GMB, the control device 200 may store the processing gamma value in the storage unit 122. The gamma values ​​GMR, GMG, and GMB reflecting the temperature characteristics may be stored in the storage unit 122.

[0083] After storing the gamma values ​​GMR, GMG, and GMB corresponding to the specific dimming level and the specific grayscale in step S410, the control device 200 may determine whether additional gamma value setting is required (S412). In an embodiment, the control device 200 may store the gamma values ​​GMR, GMG, and GMB corresponding to all grayscale values ​​included in each of the plurality of dimming levels in the storage unit 122 while repeating steps S404 to S410.

[0084] When additional gamma value setting is not required in step S412, power supply of the display device 100 may be suspended (S414). In an embodiment of the present disclosure, when passing through steps S402 to S414, the gamma values ​​GMR, GMG, and GMB may be stored in the storage unit 122 during the manufacturing process.

[0085] Figure 6 It is shown that the Figure 3 A diagram of an embodiment of a lookup table in a control device is shown in FIG.

[0086] refer to Figure 3 and Figure 6 , the control device 200 may include a lookup table LUT, and information for setting the gamma value may be stored in the lookup table LUT. In an example, the grayscale (e.g., 10Gray, 60Gray, ..., and 255Gray) displayed at each of the dimming levels DEV1, ..., and DEVp may be included in the lookup table LUT. In addition, the gamma values ​​GMR, GMG, and GMB corresponding to the temperature of each grayscale (e.g., 0°C, 10°C, ..., 40°C, 50°C, ...) may be stored in the lookup table LUT.

[0087] In an example, a plurality of dimming levels DEV1 , . . . , and DEVp may be included in a lookup table LUT, and each of the plurality of dimming levels DEV1 , . . . , and DEVp may include a plurality of gray levels (eg, 10 Gray, 60 Gray, . . . , and 255 Gray). Figure 6 The grayscale information shown in is merely illustrative, and the grayscale in each of the dimming levels DEV1, . . . , and DEVp may be set differently.

[0088] Each gray level may include a plurality of temperature information (e.g., 0°C, 10°C, ..., 40°C, 50°C, ...) The temperature information may correspond to the temperature of the pixel unit 110, and the gamma values ​​GMR, GMG, and GMB (or gamma value setting information) corresponding to each temperature may be stored in a lookup table LUT.

[0089] In an embodiment, first gamma values ​​GMR (GMR11a, GMR12a, ..., GMR13a, GMR14a, ..., GMR21a, GMR22a, ..., GMR23a, GMR24a, ..., GMR31a, GMR32a, ..., GMR33A and GMR34a) corresponding to the temperature of the grayscale at the first dimming level DEV1, respectively, may be stored in a lookup table LUT. In an embodiment, first gamma values ​​GMR (GMR11b, GMR12b, ..., GMR13b, GMR14b, ..., GMR21b, GMR22b, ..., GMR23b, GMR24b, ..., GMR31b, GMR32b, ..., GMR33b and GMR34b) corresponding to the temperature of the grayscale at the pth dimming level DEVp, respectively, may be stored in the lookup table LUT. The first gamma value GMR may be predetermined by experiment.

[0090] In an embodiment, second gamma values ​​GMG (GMG11a, GMG12a, ..., GMG13a, GMG14a, ..., GMG21a, GMG22a, ..., GMG23a, GMG24a, ..., GMG31a, GMG32a, ..., GMG33a, and GMG34a) corresponding to the temperature of the grayscale at the first dimming level DEV1, respectively, may be stored in a lookup table LUT. In addition, second gamma values ​​GMG (GMG11b, GMG12b, ..., GMG13b, GMG14b, ..., GMG21b, GMG22b, ..., GMG23b, GMG24b, ..., GMG31b, GMG32b, ..., GMG33b, and GMB34b) corresponding to the temperature of the grayscale at the p-th dimming level DEVp, respectively, may be stored in the lookup table LUT. The second gamma value GMG may be predetermined by experiment.

[0091] In the example, the third gamma values ​​GMB (GMB11a, GMB12a, ..., GMB13a, GMB14a, ..., GMB21a, GMB22a, ..., GMB23a, GMB24a, ..., GMB31a, GMB32a, ..., GMB33a and GMB34a) corresponding to the temperature of the grayscale at the first dimming level DEV1, respectively, can be stored in the lookup table LUT. In addition, the third gamma values ​​GMB (GMB11b, GMB12b, ..., GMB13b, GMB14b, ..., GMB21b, GMB22b, ..., GMB23b, GMB24b, ..., GMB31b, GMB32b, ..., GMB33b and GMB34b) corresponding to the temperature of the grayscale at the p-th dimming level DEVp, respectively, can be stored in the lookup table LUT. The third gamma value GMB can be predetermined by experiment.

[0092] Figure 7 It is shown that the use Figure 6 Flow chart of an embodiment of a process for setting a gamma value using a lookup table as shown in FIG.

[0093] refer to Figure 3 , Figure 6 and Figure 7 , power may be supplied to the display device 100 during the manufacturing process to set the gamma value (S702). After power is input to the display device 100, the control device 200 may supply processing data and processing gamma values ​​corresponding to the dimming level DEV and the grayscale Gray to the timing controller 120. The processing data may be supplied to the data driver 150 via the timing controller 120, and the processing gamma value may be supplied to the gamma voltage supplier 160 via the timing controller 120. The gamma voltage supplier 160 supplied with the processing gamma value may supply gamma voltages VGR, VGG, and VGB corresponding to the processing gamma value to the data driver 150.

[0094] The data driver 150 supplied with the processed data may generate a data signal using the gamma voltages VGR, VGG, and VGB, and may supply the data signal to the pixel unit 110. An image corresponding to a specific dimming level and a specific grayscale may be displayed in the pixel unit 110 (S704).

[0095] When a predetermined image is displayed in the pixel unit 110 , the temperature sensor TES may sense the temperature of the pixel unit 110 and supply a temperature value TV corresponding to the sensed temperature to the timing controller 120 ( S706 ). The timing controller 120 may supply the temperature value TV to the control device 200 .

[0096] The control device 200 supplied with the temperature value TV may load the gamma values ​​GMR, GMG, and GMB corresponding to the dimming level DEV, the gray level Gray, and the temperature value TV, and store the corresponding gamma values ​​in the storage unit 122 .

[0097] In an example, when the processing data corresponding to the first dimming level DEV1 and 255Gray is supplied in step S708, and the temperature value TV corresponds to 40°C, the control device 200 may store the first gamma value GMR33a, the second gamma value GMG33a, and the third gamma value GMB33a in the storage unit 122. In an example, when the processing data corresponding to the first dimming level DEV1 and 255Gray is supplied in step S708, and the temperature value TV corresponds to 50°C, the control device 200 may store the first gamma value GMR34a, the second gamma value GMG34a, and the third gamma value GMB34a in the storage unit 122.

[0098] After storing the gamma values ​​GMR, GMG, and GMB corresponding to the specific dimming level and the specific grayscale in step S708, the control device 200 may determine whether additional gamma value setting is required (S710). The control device 200 may store the gamma values ​​GMR, GMG, and GMB corresponding to all grayscale values ​​included in each of the plurality of dimming levels in the storage unit 122 while repeating steps S704 to S708.

[0099] When additional gamma value setting is not required in step S7410, power supply of the display device 100 may be suspended (S712). When performing steps S702 to S712, the display device 100 according to an embodiment of the present disclosure may store the gamma values ​​GMR, GMG, and GMB in the storage unit 122 during the manufacturing process.

[0100] When the general Figure 6 When the lookup table LUT shown in FIG. 1 is stored in the control device 200, the control device 200 can store the gamma values ​​GMR, GMG, and GMB corresponding to a specific dimming level, a specific grayscale, and a specific temperature in the storage unit 122 without capturing any image displayed in the pixel unit 110. Therefore, the Figure 3 The camera 202 is shown in FIG.

[0101] Figure 8 is a diagram showing a display device according to an embodiment of the present disclosure. Figure 8 In the Figure 3 The sections shown in the description are repeated sections.

[0102] refer to Figure 8, a display device 100 according to an embodiment of the present disclosure may include a pixel unit 110 (or a display panel), a timing controller 120a, a scan driver 130, an emission driver 140, a data driver 150, a gamma voltage supplier 160, a power source 170, and a temperature sensor TES.

[0103] The timing controller 120a may include a storage unit 122 and a lookup table LUT. Information for setting a gamma value may be stored in the lookup table LUT.

[0104] In the example, Figure 4 As shown in , the brightness and color coordinate information to be displayed in the pixel unit 110 corresponding to the grayscale (e.g., 10Gray, 60Gray, ..., and 255Gray) displayed at each of the dimming levels DEV1, ..., and DEVp and the temperature of each grayscale (e.g., 0° C., 10° C., ..., 40° C., 50° C., ...) can be stored in the lookup table LUT. In an example, as Figure 6 As shown in, the gamma values ​​GMR, GMG, and GMB corresponding to the gray levels (e.g., 10Gray, 60Gray, ..., and 255Gray) displayed at each of the dimming levels DEV1, ..., and DEVp and the temperature of each gray level (e.g., 0°C, 10°C, ..., 40°C, 50°C, ...) can be stored in a lookup table LUT.

[0105] When the lookup table LUT is included in the timing controller 120a and the initial gamma value is stored in the storage unit 122 during the manufacturing process, the Figure 3 The control device 200 shown in FIG. That is, the control device 200 may be replaced by the timing controller 120 a. To this end, processing data corresponding to the grayscale Gray, the processing gamma value, etc. respectively included in the dimming level DEV may be additionally stored in the storage unit 122 .

[0106] The process of setting the gamma values ​​GMR, GMG and GMB using the timing controller 120a during the manufacturing process is similar to Figure 5 and Figure 7 The process described in is basically the same, and therefore a detailed description will be omitted.

[0107] Fig. 9 It is shown Figure 1 An embodiment of a pixel is shown in FIG.

[0108] refer to Fig. 9 , the pixel PXij may include transistors T11 , T12 , T13 , T14 , T15 , T16 , and T17 , a storage capacitor Cst , and a light emitting element LD.

[0109] In the following, a circuit implemented by a P-type transistor is described as an example. However, those skilled in the art can design a circuit implemented by an N-type transistor by changing the polarity of the voltage applied to the gate terminal. Similarly, those skilled in the art can design a circuit implemented by a combination of a P-type transistor and an N-type transistor. The transistor can have various forms including a thin film transistor (TFT), a field effect transistor (FET), a bipolar junction transistor (BJT), etc.

[0110] A gate electrode of the eleventh transistor T11 may be connected to the first node N1, a first electrode of the eleventh transistor T11 may be connected to the second node N2, and a second electrode of the eleventh transistor T11 may be connected to the third node N3. The eleventh transistor T11 may be referred to as a driving transistor.

[0111] A gate electrode of the twelfth transistor T12 may be connected to the scan line SLi1, a first electrode of the twelfth transistor T12 may be connected to the data line DLj, and a second electrode of the twelfth transistor T12 may be connected to the second node N2. A gate electrode of the thirteenth transistor T13 may be connected to the scan line SLi2, a first electrode of the thirteenth transistor T13 may be connected to the first node N1, and a second electrode of the thirteenth transistor T13 may be connected to the third node N3.

[0112] A gate electrode of the fourteenth transistor T14 may be connected to the scan line SLi3, a first electrode of the fourteenth transistor T14 may be connected to the first node N1, and a second electrode of the fourteenth transistor T14 may be connected to the initialization line INTL. A gate electrode of the fifteenth transistor T15 may be connected to the kth emission control line ELk, a first electrode of the fifteenth transistor T15 may be connected to the first power line PL1, and a second electrode of the fifteenth transistor T15 may be connected to the second node N2.

[0113] A gate electrode of the sixteenth transistor T16 may be connected to the kth emission control line ELk, a first electrode of the sixteenth transistor T16 may be connected to the third node N3, and a second electrode of the sixteenth transistor T16 may be connected to the anode of the light emitting element LD. In an embodiment, the fifteenth transistor T15 and the sixteenth transistor T16 may be connected to different emission control lines.

[0114] A gate electrode of the seventeenth transistor T17 may be connected to the scan line SLi4, a first electrode of the seventeenth transistor T17 may be connected to the initialization line INTL, and a second electrode of the seventeenth transistor T17 may be connected to the anode of the light emitting element LD. A first electrode of the storage capacitor Cst may be connected to the first power line PL1, and a second electrode of the storage capacitor Cst may be connected to the first node N1.

[0115] The anode of the light emitting element LD can be connected to the second electrode of the sixteenth transistor T16, and the cathode of the light emitting element LD can be connected to the second power line PL2. The light emitting element LD can be a light emitting diode. The light emitting element LD can be configured as an organic light emitting diode, an inorganic light emitting diode, a quantum dot / well light emitting diode, etc. The light emitting element LD can emit light of any one of the first color, the second color, and the third color. In addition, in the present embodiment, only one light emitting element LD is provided in each pixel. However, in another embodiment, a plurality of light emitting elements can be provided in each pixel. A plurality of light emitting elements can be connected in series, in parallel, in series / in parallel, etc.

[0116] The voltage of the first power source VDD may be applied to the first power line PL1, the voltage of the second power source VSS may be applied to the second power line PL2, and the voltage of the initialization power source may be applied to the initialization line INTL. For example, the voltage of the initialization power source may be equal to or higher than the voltage of the second power source VSS. For example, the voltage of the initialization power source may correspond to a data voltage having a minimum size among the sizes of the data voltages that can be provided. In another example, the size of the voltage of the initialization power source may be smaller than the size of the data voltage that can be provided.

[0117] Fig.10 It is shown Fig. 9 FIG. 4 is a diagram of an exemplary driving method of a pixel shown in FIG.

[0118] In the following, for ease of description, it is assumed that the scan lines SLi1, SLi2, and SLi4 correspond to the i-th scan line SLi, and the scan line SLi3 corresponds to the i-1th scan line SLi-1. However, in some embodiments, the connection relationship between the scan lines SLi1, SLi2, SLi3, and SLi4 may be changed. For example, the scan line SLi4 may be the i-1th scan line or the i+1th scan line.

[0119] First, an emission control signal having a cut-off level (high logic level) is applied to the kth emission control line ELk, a data signal DATA(i-1)j for the i-1th pixel is applied to the data line DLj, and a scan signal having a turn-on level (low logic level) is applied to the scan line SLi3. The high / low of the logic level can be changed depending on whether the transistor is a P-type transistor or an N-type transistor.

[0120] Since the scan signal having the off level is applied to the scan lines SLi1 and SLi2 , the twelfth transistor T12 is in a turned-off state and prevents the data signal DATA(i−1)j of the i−1th pixel from being input to the pixel PXij.

[0121] Since the fourteenth transistor T14 is in the on state, the first node N1 is connected to the initialization line INTL, so that the voltage of the first node N1 is initialized. Since the emission control signal with a cut-off level is applied to the emission control line ELk, the transistors T15 and T16 are in the cut-off state, and the light emitting element LD is prevented from unnecessary emission during the application of the voltage of the initialization power supply.

[0122] Next, a data signal DATAij for the i-th pixel PXij is applied to the data line DLj, and a scan signal having a conduction level is applied to the scan lines SLi1 and SLi2. Thus, the transistors T12, T11, and T13 are turned on, and the data line DLj and the first node N1 are electrically connected to each other. Therefore, a compensation voltage obtained by subtracting the threshold voltage of the eleventh transistor T11 from the data signal DATAij is applied to the second electrode (i.e., the first node N1) of the storage capacitor Cst, and the storage capacitor Cst maintains a voltage corresponding to the difference between the voltage of the first power supply VDD and the compensation voltage. Such a period may be referred to as a threshold voltage compensation period or a data writing period.

[0123] In addition, when the scan line SLi4 is the i-th scan line, the seventeenth transistor T17 is in the on state. Therefore, the anode of the light emitting element LD and the initialization line INTL are connected to each other, and the light emitting element LD is initialized to a charge amount corresponding to the voltage difference between the voltage of the initialization power supply and the voltage of the second power supply VSS.

[0124] Then, when the emission control signal having the on level is applied to the kth emission control line ELk, the transistors T15 and T16 may be electrically connected to each other, thereby forming a driving current path through which the first power line PL1, the fifteenth transistor T15, the eleventh transistor T11, the sixteenth transistor T16, the light emitting element LD, and the second power line PL2 are connected to each other.

[0125] The amount of driving current flowing through the first electrode and the second electrode of the eleventh transistor T11 is adjusted according to the voltage held in the storage capacitor Cst. The light emitting element LD emits light having a brightness corresponding to the amount of driving current. The light emitting element LD emits light until an emission control signal having a cut-off level is applied to the emission control line ELk.

[0126] When the emission control signal has an on-level, the pixel receiving the corresponding emission control signal may be in a display state. Therefore, the period in which the emission control signal has an on-level may be referred to as an emission period EP (or emission enabled period). In addition, when the emission control signal has an off-level, the pixel receiving the corresponding emission control signal may be in a non-display state. Therefore, the period in which the emission control signal has an off-level may be referred to as a non-emission period NEP (or emission prohibited period).

[0127] Fig.10 The non-emission period NEP described in is used to prevent the pixel PXij from emitting light with undesired brightness during the initialization period and the data writing period.

[0128] One or more non-emission periods NEP may be additionally provided while maintaining the data signal written to the pixel PXij (eg, one frame period). This is for the purpose of reducing the emission period EP of the pixel PXij, thereby effectively representing a low grayscale or gentle blur motion of an image.

[0129] In the display device and the gamma voltage setting method thereof according to the present disclosure, the gamma voltage (or gamma value) can be set by reflecting the temperature characteristics of the manufacturing process device, and thus, the display quality of the display device can be improved.

[0130] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and interpreted in a general and descriptive sense only and not for purposes of limitation. In some cases, as will be apparent to one of ordinary skill in the art upon filing this application, unless otherwise specifically stated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as set forth in the appended claims.

Claims

1. A method for setting a gamma voltage of a display device, wherein: The gamma voltage setting method comprises: supplying data corresponding to a specific grayscale level of a specific dimming level to a data driver; generating a data signal corresponding to the data in the data driver using a gamma voltage corresponding to a processing gamma value; Displaying an image corresponding to the data signal in a pixel unit; determining a temperature of the pixel unit; Loading a target brightness and a target color coordinate corresponding to the specific dimming level, the specific grayscale level and the temperature of the pixel unit from a lookup table; generating a gamma value so that an image corresponding to the target brightness and the target color coordinates is displayed in the pixel unit; and The gamma value is stored.

2. The gamma voltage setting method according to claim 1, wherein: The gamma value is stored in the display device during a manufacturing process of the display device.

3. The gamma voltage setting method according to claim 1, wherein: The gamma values ​​include a first gamma value corresponding to a pixel of a first color, a second gamma value corresponding to a pixel of a second color, and a third gamma value corresponding to a pixel of a third color.

4. The gamma voltage setting method according to claim 1, wherein: A plurality of dimming levels, a plurality of gray levels included in each of the plurality of dimming levels, and the target brightness and the target color coordinates corresponding to at least two different temperatures in each of the plurality of gray levels are stored in the lookup table.

5. A method for setting a gamma voltage of a display device, wherein: The gamma voltage setting method comprises: supplying data corresponding to a specific grayscale level of a specific dimming level to a data driver; generating a data signal corresponding to the data in the data driver using a gamma voltage corresponding to a processing gamma value; Displaying an image in a pixel unit corresponding to the data signal; determining a temperature of the pixel unit; loading a gamma value corresponding to the specific dimming level, the specific grayscale level, and the temperature of the pixel unit from a lookup table; and The gamma value is stored.

6. The gamma voltage setting method according to claim 5, wherein: The gamma values ​​include a first gamma value corresponding to a pixel of a first color, a second gamma value corresponding to a pixel of a second color, and a third gamma value corresponding to a pixel of a third color.

7. The gamma voltage setting method according to claim 5, wherein: A plurality of dimming levels, a plurality of gray levels included in each of the plurality of dimming levels, and the gamma values ​​corresponding to at least two different temperatures in each of the plurality of gray levels are stored in the lookup table.

8. A display device, wherein: The display device comprises: A pixel unit including pixels connected to a scan line and a data line; a data driver configured to supply a data signal to the data line; a gamma voltage supplier configured to supply a gamma voltage to the data driver corresponding to a gamma value; A timing controller, comprising a storage unit and a lookup table, wherein the storage unit is configured to store the gamma value; and a temperature sensor configured to sense the temperature of the pixel unit, wherein a plurality of dimming levels, a plurality of gray levels included in each of the plurality of dimming levels, and gamma value setting information corresponding to at least two different temperatures in each of the plurality of gray levels are stored in the lookup table, The gamma value setting information corresponds to the target brightness and target color coordinates of the pixel unit corresponding to the at least two different temperatures, or corresponds to the gamma value corresponding to the at least two different temperatures, and The gamma values ​​include a first gamma value corresponding to a pixel of a first color, a second gamma value corresponding to a pixel of a second color, and a third gamma value corresponding to a pixel of a third color.

9. The display device according to claim 8, wherein: The timing controller: displaying an image corresponding to a specific grayscale level of a specific dimming level in the pixel unit during a manufacturing process; as well as The gamma value corresponding to the specific grayscale of the specific dimming level and the target brightness and target color coordinates corresponding to the temperature of the pixel unit measured from the temperature sensor are stored in the storage unit.

10. The display device according to claim 8, wherein: The timing controller: displaying an image corresponding to a specific grayscale level of a specific dimming level in the pixel unit during a manufacturing process; as well as The gamma value corresponding to the specific grayscale of the specific dimming level and the temperature of the pixel unit measured from the temperature sensor are loaded from the lookup table, and the gamma value is stored in the storage unit.

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