JP6465944B2 - Display device, television receiver, display method, control program, and recording medium - Google Patents

Description

  The present invention relates to a display device for displaying an image with adjusted white balance, a television receiver including the display device, a display method for displaying an image on the display device, a control program for causing a computer to function as the display device, and The present invention relates to a recording medium on which the control program is recorded.

  Generally, there is an individual difference in the white balance of an image displayed by a display device. Therefore, white balance is adjusted in the process of manufacturing the display device. On the other hand, since adjustment of white balance is accompanied by a decrease in luminance, a technique for suppressing the decrease in luminance is required.

  For example, in Patent Document 1, the convergence point of the display color included in the target range is set so that the luminance decrease is smaller so that the display color when the white image is displayed is included in the predetermined target range. A white balance adjustment method is described.

  Further, for example, Patent Document 2 describes a method of readjusting the gradation of at least one of two colors whose gradation is not fixed when the screen brightness after white balance adjustment is lower than the reference luminance. Has been.

JP 2013-126045 A (released on June 24, 2013) JP 2014-109710 A (released on June 12, 2014)

  However, with the above-described conventional technology, even when an HDR (High Dynamic Range) signal, which is an image signal for displaying a high-contrast image, is acquired, the display device can output by adjusting white balance. There is a problem that an image having a lower luminance than the normal luminance is displayed. In consideration of the case where an HDR signal image is displayed, if the white balance is adjusted so as to increase the luminance, color variation increases when the SDR signal image is displayed.

  The present invention has been made in view of the above problems, and an object of the present invention is to display an image of an HDR signal in which a decrease in luminance due to white balance adjustment is suppressed while suppressing variations in color of the image of the SDR signal. To provide technology.

  In order to solve the above problems, a display device according to an aspect of the present invention is a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color, and the input image A determination unit that determines whether the signal is a first image signal or a second image signal that has a wider dynamic range of possible luminance than the first image signal; and the determination unit includes: A display control unit that changes a gain for a primary color other than one of the primary colors to a value higher than a set value when it is determined that the second image signal is the second image signal, When it is determined that the image signal is the second image signal, the display control unit has a gain value for at least one of the primary colors and a gradation value higher than a predetermined gradation value. Gain value Change to above the set value predetermined gain value, the display control unit may further be changed at least one of the predetermined gradation value and the predetermined gain value.

  In order to solve the above problems, a display device according to an aspect of the present invention is a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color, and the input image A determination unit that determines whether the signal is a first image signal or a second image signal that has a wider dynamic range of possible luminance than the first image signal; and the determination unit includes: A display control unit that changes a gain for a primary color other than one of the primary colors to a value higher than a set value when it is determined that the second image signal is the second image signal, When the image signal is determined to be the second image signal, and the gradation value of the image indicated by the input image signal is higher than the predetermined gradation value, the display control unit is configured to display at least one of the primary colors. For any primary color The down, change to a higher predetermined gain value than the set value, the display control unit may further be changed at least one of the predetermined gradation value and the predetermined gain value.

  In order to solve the above problems, a display device according to an aspect of the present invention is a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color, and the input image A determination unit that determines whether the signal is a first image signal or a second image signal that has a wider dynamic range of possible luminance than the first image signal; and the determination unit includes: A display control unit that changes a gain for a primary color other than one of the primary colors to a value higher than a set value when it is determined that the second image signal is the second image signal, When the image signal is determined to be the second image signal, and the luminance indicated by the luminance information included in the input second image signal is higher than the predetermined luminance, the display control unit At least one of the originals The gain for changes in the higher predetermined gain value than the set value, the display control unit may further be changed at least one of the predetermined brightness and the predetermined gain value.

  In order to solve the above problems, a display device according to an aspect of the present invention is a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color, and the input image A determination unit that determines whether the signal is a first image signal or a second image signal that has a wider dynamic range of possible luminance than the first image signal; and the determination unit includes: A display control unit that changes a gain for a primary color other than one of the primary colors to a value higher than a set value when it is determined that the second image signal is the second image signal, The brightness of the image to be displayed can be adjusted for each of the plurality of areas divided into a plurality of areas, and when the brightness of the area with the highest brightness among the plurality of areas is higher than a predetermined brightness, Display system The unit changes a gain for at least one of the primary colors to a predetermined gain value higher than a set value, and the display control unit further includes at least the predetermined luminance and the predetermined gain value. Either can be changed.

  In order to solve the above-described problem, a display method according to an aspect of the present invention is a display method for displaying an image on a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color. Whether the input image signal is the first image signal or the second image signal indicating an image having a dynamic range wider than the dynamic range of the image indicated by the first image signal. And when the image signal is determined to be a second image signal in the determination step, a gain value for a primary color other than one of the primary colors and a predetermined gradation value A display control step of changing a gain value at a higher gradation value to a predetermined gain value higher than a set value, and further in the display control step. , It is possible to change at least one of the predetermined gradation value and the predetermined gain value.

  In order to solve the above-described problem, a display method according to an aspect of the present invention is a display method for displaying an image on a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color. Whether the input image signal is the first image signal or the second image signal indicating an image having a dynamic range wider than the dynamic range of the image indicated by the first image signal. And when the image signal is determined to be the second image signal in the determination step and the gradation value of the image indicated by the input image signal is higher than a predetermined gradation value, A display control step of changing a gain for a primary color other than one of the primary colors to a predetermined gain value higher than a set value. Furthermore, it is possible to change at least one of the predetermined gradation value and the predetermined gain value.

  In order to solve the above-described problem, a display method according to an aspect of the present invention is a display method for displaying an image on a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color. Whether the input image signal is the first image signal or the second image signal indicating an image having a dynamic range wider than the dynamic range of the image indicated by the first image signal. And determining in the determining step that the image signal is determined to be a second image signal and the luminance indicated by the luminance information included in the input second image signal is higher than a predetermined luminance A display control step of changing a gain for a primary color other than one of the primary colors to a predetermined gain value higher than a set value. Tsu yet up, it is possible to change at least one of the predetermined brightness and the predetermined gain value.

  In order to solve the above-described problem, a display method according to an aspect of the present invention is a display method for displaying an image on a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color. Whether the input image signal is the first image signal or the second image signal indicating an image having a dynamic range wider than the dynamic range of the image indicated by the first image signal. In the determining step and the determining step, when the image signal is determined to be the second image signal, the gain for the primary colors other than one of the primary colors is set to a value higher than the set value. A display control step for changing, and in the display control step, the brightness of the image to be displayed can be adjusted for each of the plurality of areas divided into the plurality of areas. In the display control step, when the luminance of the area having the highest luminance among the plurality of areas is higher than a predetermined luminance, the gain for at least one of the primary colors is set to a set value. In the display control step, at least one of the predetermined luminance and the predetermined gain value can be changed.

  According to one aspect of the present invention, an image in which a decrease in luminance due to white balance adjustment is suppressed while suppressing variation in the color of the image of the first image signal (SDR signal), and a possible dynamic range of the luminance Can display an image of the second image signal (HDR signal) wider than the SDR signal.

It is a block diagram which shows the principal part structure of the television receiver which concerns on Embodiment 1 of this invention. It is an external view which shows the display apparatus, personal computer, and portable information terminal device which are implement | achieved as some televisions concerning Embodiment 1 of this invention. It is a graph which shows the gain with respect to each primary color of the image which the television concerning Embodiment 1 of this invention displays. It is a graph which shows the gain with respect to each primary color of the brightness priority image which the television concerning Embodiment 1 of the present invention displays. It is a flowchart which shows the flow of the process which the television concerning Embodiment 1 of this invention performs. It is a figure which shows the structure which a user can set the predetermined gradation value in Embodiment 2 of this invention. It is a figure which shows the structure which a user can set the gain in the gradation value higher than the predetermined gradation value in Embodiment 3 of this invention.

Embodiment 1
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

(TV receiver 1)
FIG. 1 is a block diagram illustrating a main configuration of a television receiver (display device) 1 according to the first embodiment. The television receiver 1 (hereinafter simply referred to as “TV 1”) has not only a standard dynamic range (SDR) signal (first image signal), which is an image signal of a standard dynamic range, but also a luminance that can be obtained. An HDR (High Dynamic Range) signal (second image signal) having a wider dynamic range than the SDR signal can be acquired, and an image corresponding to the image signal can be displayed.

  For example, SMPTE (Society of Motion Picture and Television Engineers) ST. There are video formats defined by 2084-2014, CTA (Consumer Technology Association) -861-F, and the like. As a standard to which the SDR signal complies, for example, Rec. ITU-R BT. There is a video format standardized by 709.

  Furthermore, the television 1 determines whether the input image signal is an HDR signal or an SDR signal, and the primary colors of the image to be displayed are red (R), green (G), and blue (B). By changing the gain value for at least one of the above, a luminance priority image or a chromaticity priority image is displayed. Details of this configuration and luminance priority image and chromaticity priority image will be described later.

  As shown in FIG. 1, the television 1 includes an image signal acquisition unit 10, a determination unit 12, a display control unit 14, a display unit 16, a storage unit 18, and an operation reception unit 20.

  The image signal acquisition unit 10 is an interface that acquires an image signal. Examples of the image signal acquired by the image signal acquisition unit 10 include a tuner signal acquired via a tuner, an HDMI signal acquired via HDMI (registered trademark) (High-Definition Multimedia Interface), Alternatively, a CVBS (Composite Video, Blanking, and Sync: composite video signal) signal may be used.

  The determination unit 12 determines whether the image signal acquired by the image signal acquisition unit 10 is an HDR signal or an SDR signal.

  The display control unit 14 controls the display unit 16 to be described later and causes the display unit 16 to display an image. Further, the display control unit 14 causes the display unit 16 to display a luminance priority image or a chromaticity priority image in accordance with the determination result by the determination unit 12.

  The display unit 16 is a display device that displays an image. The display unit 16 is realized by a transmissive liquid crystal panel having a backlight, an organic EL (Electroluminescence) display, or the like. The white balance of the image displayed on the display unit 16 can be adjusted by adjusting the gain value for each primary color.

  The storage unit 18 is a device that can store data. Specifically, the storage unit 18 stores gain values for the respective primary colors after white balance adjustment.

  The operation reception unit 20 receives a user operation and outputs operation information indicating the operation. The operation receiving unit 20 is realized by an infrared signal light receiving unit that receives an infrared signal transmitted from a remote controller, a switch, a touch pad, or the like.

(Appearance of TV 1)
FIG. 2 is an external view showing the display device 2, the personal computer 3, and the portable information terminal device 4 that are realized as a part of the television 1 according to the first embodiment. As shown in FIG. 2, the display device 2 (FIG. 2A), the personal computer 3 (FIG. 2B), or the portable information terminal device 4 (FIG. 2C) is connected to the television 1. However, the present invention is not limited to this.

(Luminance priority image and chromaticity priority image)
The luminance priority image and the chromaticity priority image displayed on the television 1 will be described with reference to FIGS. FIG. 3 is a graph showing the gain for each primary color of the image displayed by the television 1 according to the first embodiment. FIG. 3A is a graph showing the gain for each primary color before white balance adjustment, and FIG. 3B is a graph showing the gain for each primary color after white balance adjustment. FIG. 4 is a graph showing the gain for each primary color of the luminance priority image displayed by the television 1 according to the first embodiment. 4A is a graph showing an example of the gain for each primary color of the luminance priority image, and FIG. 4B is a graph showing another example of the gain for each primary color of the luminance priority image. c) is a graph showing still another example of the gain for each primary color of the luminance priority image.

  Since the display unit 16 included in the television 1 has individual differences in white balance of images to be displayed, for example, a step of adjusting the white balance in the manufacturing process of the television 1 is executed. An example of the process of adjusting such white balance will be described below.

  First, as shown in FIG. 3A, the television 1 is set so that the luminance of the image to be displayed becomes the highest luminance when the gradation value of the input image signal is the highest gradation value. Display an image with gain. Subsequently, the gain value of one of the primary colors is fixed and the gain value of the other two primary colors is lowered so that the chromaticity of the image displayed on the television 1 becomes a predetermined chromaticity. . For example, when the white balance is adjusted with the gain for red (R) fixed, the gain for each primary color is as shown in the graph of FIG. Since the white balance image adjusted in this way has low luminance but chromaticity is adjusted, the television 1 displays the image as a chromaticity priority image.

  On the other hand, by increasing the gain value lowered by adjusting the white balance, the television 1 can display an image with high luminance, that is, a luminance priority image, although the chromaticity deviates from a predetermined chromaticity. The television 1 can display a luminance-priority image by increasing the gain values for green (G) and blue (B) as shown in FIG.

  Further, as shown in FIGS. 4B and 4C, the television 1 has a gain value for at least one of the primary colors as a luminance priority image, and has a predetermined gradation value ( You may display the image which changed the gain in a gradation value higher than (1st predetermined gradation value) so that a brightness | luminance might raise.

  For example, as shown in FIG. 4B, the gain value for green (G) from the lowest gradation value to the gradation value L1 is set to the same gain value as that of the chromaticity priority image. Further, the gain value for green (G) at the gradation value higher than the gradation value L1 is set so that the luminance becomes maximum when the gradation value is the maximum gradation value.

  Similarly, for the gain of blue (B), the gain value for blue (B) from the lowest gradation value to the gradation value L2 is set to the same gain value as that of the chromaticity priority image. Further, the gain for blue (B) at the gradation value higher than the gradation value L2 is set so that the luminance becomes maximum when the gradation value is the maximum.

  By setting the gain value in this way, the television 1 displays an image having a gradation value lower than the gradation value L1 and the gradation value L2 as a chromaticity priority image, and the gradation value L1 and the gradation value. An image having a gradation value higher than L2 can be displayed as a luminance priority image.

  As another example, as shown in FIG. 4C, the gain value for green (G) from the lowest gradation value to the gradation value L3 is set to the same gain value as that of the chromaticity priority image. To do. In addition, the gain value for green (G) at the gradation value higher than the gradation value L3 is higher than the gain value in the chromaticity priority image, and the luminance is lower than the maximum in the case of the maximum gradation value. Set to.

  Similarly, for the gain of blue (B), the gain value for blue (B) from the lowest gradation value to the gradation value L4 is set to the same gain value as that of the chromaticity priority image. Further, the gain for blue (B) at the gradation value higher than the gradation value L4 is set to a value that is higher than the gain value in the chromaticity priority image and that the luminance is lower than the maximum in the case of the maximum gradation value. To do.

  By setting the gain value in this way, the television 1 displays the gradation value L3 and the gradation value lower than the gradation value L4 as a chromaticity priority image, and the gradation value L3 and the gradation value. An image having a gradation value higher than L4 can be displayed as a luminance-priority image with suppressed chromaticity shift.

  Note that the gradation values L1 to L4 (hereinafter collectively referred to as “predetermined gradation values L”) may be the same gradation values.

  The predetermined gradation value L is an arbitrary value. For example, in the histogram of the image signal input to the television 1, the gradation value having the highest luminance level of 10% is set as the predetermined gradation value L. The method of doing is mentioned. In addition, a gradation value at which the luminance indicated by the information included in the HDR signal input to the television 1 is higher than a predetermined luminance (for example, luminance that is 50% of the luminance that can be displayed by the display unit 16) is set to a predetermined level. A method of adjusting the value L can be mentioned.

  Further, when the television 1 has a configuration in which the display unit 16 is divided into a plurality of areas and the brightness of an image to be displayed can be adjusted for each of the plurality of areas (so-called local dimming), the highest brightness is predetermined. A method in which a gradation value that is higher than the luminance of the predetermined gradation value L is used. More specifically, when the brightness that can be displayed brightest when the TV 1 lights all areas with the same brightness is 100%, a part of the plurality of areas is lighted brightly. Compared with when all areas are lit with 100% luminance, power can be concentrated on the partial area, so that the luminance of 100% or more can be displayed in the partial area. it can. Therefore, as the predetermined luminance, for example, there is a method in which the display unit 16 sets 100% luminance as the predetermined luminance and sets a gradation value at which the luminance becomes 100% as the predetermined gradation value L.

(Processing executed by the television 1)
FIG. 5 is a flowchart showing a flow of processing executed by the television 1 according to the first embodiment. Processing executed by the television 1 (display method for displaying an image on the television 1) will be described with reference to FIG.

  First, in the process of FIG. 5, the white balance adjustment of the luminance priority image and the white balance adjustment of the chromaticity priority image are performed on the television 1, and the gain of each primary color after the adjustment is adjusted. The value is executed in a state where the value is stored in the storage unit 18.

(Step S2)
The image signal acquisition unit 10 acquires an image signal. The image signal acquisition unit 10 outputs the acquired image signal to the determination unit 12.

(Step S4: discrimination step)
The determination unit 12 determines whether the image signal output from the image signal acquisition unit 10 is an HDR signal.

(Step S6: Display control step)
When it is determined in step S4 that “the image signal is an HDR signal” (step S4: YES), the display control unit 14 stores a gain value for each primary color after the white balance adjustment of the luminance priority image. 18, the luminance priority image is displayed on the display unit 16.

(Step S8)
On the other hand, if it is determined in step S4 that “the image signal is not an HDR signal” (step S4: NO), the display control unit 14 determines the gain value for each primary color after white balance adjustment of the chromaticity priority image. Is acquired from the storage unit 18 to display a chromaticity-priority image on the display unit 16.

  As described above, when the input image signal is an HDR signal, the television 1 according to the present embodiment displays a luminance-priority image. Therefore, when the input image signal is an HDR signal, the television 1 can display an image in which a decrease in luminance due to white balance adjustment is suppressed.

  Note that the television 1 may be configured to display an image with the gain value of the graph shown in FIG. 4B or FIG. 4C without executing the process of step S4. In this case, the television 1 prioritizes chromaticity for an image with a low gradation value and prioritizes luminance for an image with a high gradation value, regardless of the input image signal. Therefore, the television 1 can display a high-contrast image while suppressing a chromaticity shift in an image with a high gradation value.

  The display control unit 14 determines that the determination unit 12 determines that the image signal is an HDR signal, and the gradation value of the image indicated by the input image signal is a predetermined gradation value (second predetermined value). In the case of higher than (gradation value), it may be configured to display a luminance-priority image in which the gain for at least one of the primary colors is changed to a value higher than a set value. In this case, when the television 1 displays an image having a gradation value higher than a predetermined gradation value, the television 1 displays an image with priority on luminance, so that an image with a high contrast can be displayed. As an example of the predetermined gradation value, there is a method in which, in the histogram of the image signal input to the television 1, the gradation value having the highest luminance level of 10% is set as the predetermined gradation value.

  Further, the display control unit 14 determines that the determination unit 12 determines that the image signal is an HDR signal, and the luminance indicated by the luminance information included in the input HDR signal is a predetermined luminance (first predetermined luminance). In the case of a higher value, a configuration in which a luminance-priority image in which the gain for at least one of the primary colors is changed to a value higher than a set value may be displayed. In this case, when the television 1 displays an image with a luminance higher than the predetermined luminance, the television 1 displays the luminance-priority image, so that an image with a high contrast can be displayed. Examples of the predetermined brightness include 50% of the brightness that can be displayed by the display unit 16.

  Further, when the television 1 has the local dimming configuration described above, the display control unit 14 determines that the determination unit 12 determines that the image signal is an HDR signal, and has the highest luminance among a plurality of areas. When the luminance of the image is higher than a predetermined luminance (second predetermined luminance), a configuration in which a luminance-priority image is displayed may be used. In this case, when the displayable luminance is higher than the predetermined luminance, the television 1 displays the luminance-priority image, so that an image with a high contrast can be displayed. As an example of the predetermined luminance, for example, a luminance of 100% of the luminance that can be displayed by the display unit 16 can be cited.

  Further, the television 1 may be configured to allow the user to set whether or not to display an image with a different gain value depending on whether the input signal is an HDR signal or an SDR signal. For example, the television 1 displays a menu screen for accepting a switching ON / OFF operation. When the operation accepting unit 20 accepts an operation for turning on the switching, an image with a different gain value is displayed depending on whether the input signal is an HDR signal or an SDR signal. . On the other hand, when the operation accepting unit 20 accepts an operation for turning off image switching, an image with the same gain value is displayed regardless of whether the input signal is an HDR signal or an SDR signal. It may be a configuration.

[Embodiment 2]
Another embodiment of the present invention will be described below. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. In the second embodiment, a configuration in which the user sets the predetermined gradation value L in the first embodiment will be described with reference to FIG. In the present embodiment, the configuration in which the user sets the predetermined gradation value L is described, but the configuration may be such that the user can individually set the gradation value L1 to the gradation value L4.

  FIG. 6 is a diagram illustrating a configuration in which a user can set a predetermined gradation value in the second embodiment. FIG. 6A is a diagram showing an example of a menu screen for the user to set a predetermined gradation value, and FIG. 6B shows each primary color when the user sets a predetermined gradation value L11. (C) is a graph showing another example of gain for each primary color when the user has set a predetermined gradation value L12, and (d) is a graph showing a predetermined gain for the user. It is a graph which shows the further another example of the gain with respect to each primary color when the gradation value L13 of this is set.

  The television 1 can cause the user to set a predetermined gradation value by displaying, for example, the menu screen shown in FIG. In the menu screen shown in FIG. 6A, the operation receiving unit 20 receives an operation for moving the bar 30 left and right from the user. Then, the display control unit 14 changes a predetermined gradation value according to the operation received by the operation receiving unit 20.

  For example, in a state where the predetermined gradation value is set to the gradation value L11 shown in FIG. 6B corresponding to the position of the bar 30 shown in FIG. When the operation to move the position of the bar 30 to the “narrow” on the left is received, the display control unit 14 sets a predetermined gradation value from the gradation value L11 as shown in FIG. A high gradation value L12 is set. On the other hand, when the operation receiving unit 20 receives an operation for moving the position of the bar 30 to the right “wide”, the display control unit 14 sets the predetermined gradation value as shown in FIG. The tone value L13 is set lower than the tone value L11.

  As described above, when the television 1 according to the second embodiment receives an operation for setting a predetermined gradation value, the predetermined gradation value L is changed according to the operation. Therefore, the television 1 can display an image corresponding to the input signal and desired by the user.

[Embodiment 3]
Still another embodiment of the present invention will be described below. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. In the third embodiment, a configuration in which the user sets a gain value at a gradation value higher than the predetermined gradation value L in the first embodiment will be described with reference to FIG. In the present embodiment, a configuration is described in which the user sets gain values for green (G) and blue (B), which are primary colors other than red (R), where the gain value is fixed. The user may be able to individually set gain values for green (G) and blue (B).

  FIG. 7 is a diagram illustrating a configuration in which a user can set a gain value at a gradation value higher than a predetermined gradation value L20 in the third embodiment. FIG. 7A is a diagram showing an example of a menu screen for the user to adjust the gain value at a gradation value higher than the predetermined gradation value L20, and FIG. 10 is a graph showing an example of gain for each primary color when a gain value at a gradation value higher than the tone value L20 is set; FIG. 6D is a graph showing another example of gain for each primary color when a value is set, and FIG. 6D is a graph for each primary color when a user sets a gain value at a gradation value higher than a predetermined gradation value L20. It is a graph which shows the other example of a gain.

  The television 1 can cause the user to set a gain value at a gradation value higher than the predetermined gradation value L, for example, by displaying the menu screen shown in FIG. In the menu screen shown in FIG. 7A, the operation accepting unit 20 accepts an operation for moving the bar 32 left and right from the user. Then, the display control unit 14 changes the gain value in the gradation value higher than the predetermined gradation value L in accordance with the operation received by the operation reception unit 20.

  For example, in a state where the gain at the gradation value higher than the predetermined gradation value L20 is set as shown in the graph shown in FIG. 7B, corresponding to the position of the bar 32 shown in FIG. When the operation accepting unit 20 accepts an operation for moving the position of the bar 32 to the left “chromaticity priority”, the display control unit 14 displays a predetermined floor as shown in FIG. It is set so that the gain value at the gradation value higher than the tone value L20 is low. On the other hand, when the operation accepting unit 20 accepts an operation for moving the position of the bar 32 to the right “luminance priority”, the display control unit 14 determines a predetermined gradation as shown in FIG. The gain value is set to be higher at the gradation value higher than the value L20.

  Thus, in the television 1 according to the third embodiment, when an operation for setting a gain value at a gradation value higher than the predetermined gradation value L20 is received, the predetermined gradation value L20 according to the operation. Change the gain value at a higher gradation value. Therefore, the television 1 can display an image corresponding to the input signal and desired by the user.

[Example of software implementation]
Each block (particularly the determination unit 12 and the display control unit 14) of the television receiver 1 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or a CPU (Central Processing). Unit) and may be realized by software.

  In the latter case, the television receiver 1 includes a CPU that executes instructions of a program that is software for realizing each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by the computer (or CPU) ) Or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
A display device (television receiver 1) according to an aspect 1 of the present invention is a display device that displays an image adjusted in white balance by setting a gain value for each primary color (R, G, B). Determine whether the input image signal is the first image signal (SDR signal) or the second image signal (HDR signal) whose possible luminance dynamic range is wider than the first image signal. When the discriminating unit (12) and the discriminating unit discriminate that the image signal is the second image signal, the gain for at least one of the primary colors is higher than the set value. And a display control unit (14) to be changed.

  According to the above configuration, when the input image signal is an HDR signal, the display device according to this aspect has a gain for at least one of the primary colors that is higher than a value set by white balance adjustment. Change to a higher value. Therefore, when the input image signal is an HDR signal, the display device according to this aspect can display an image in which a decrease in luminance due to white balance adjustment is suppressed.

  In the display device according to aspect 2 of the present invention, when the determination unit according to aspect 1 determines that the image signal is the second image signal, the display control unit includes at least one of the primary colors. The gain value at a gradation value higher than the first predetermined gradation value may be changed to a value higher than the set value.

  According to the above configuration, the display device according to this aspect displays an image (chromaticity priority image) set by white balance adjustment as an image having a gradation value equal to or less than the first predetermined gradation value. As an image having a gradation value higher than the first predetermined gradation value, an image (luminance priority image) in which a value higher than the gain value set by the white balance adjustment is displayed. Therefore, when the input image signal is an HDR signal, the display device according to this aspect can display an image with high contrast.

  In the display device according to aspect 3 of the present invention, the display control unit in aspect 2 may change the first predetermined gradation value in accordance with an operation from a user.

  According to said structure, the display apparatus which concerns on this aspect can display the image which a user desires.

  In the display device according to aspect 4 of the present invention, the display control unit according to any one of the aspects 1 to 3 changes a gain value for at least one of the primary colors in accordance with an operation from the user. May be.

  According to said structure, the display apparatus which concerns on this aspect can display the image which a user desires.

  In the display device according to aspect 5 of the present invention, the determination unit according to any one of aspects 1 to 4 determines that the image signal is the second image signal, and an image indicated by the input image signal is displayed. When the gradation value is higher than the second predetermined gradation value, the display control unit may change the gain for at least one of the primary colors to a value higher than the set value. .

  According to the above configuration, in the display device according to this aspect, when the input image signal includes a gradation value higher than the second predetermined gradation value, that is, when an image to be displayed with high luminance is included, Display brightness priority image. Therefore, when the input image signal is an HDR signal, the display device according to this aspect can display an image with high contrast.

  In the display device according to aspect 6 of the present invention, the determination unit in aspects 1 to 5 determines that the image signal is the second image signal, and the luminance included in the input second image signal When the luminance indicated by the information is higher than the first predetermined luminance, the display control unit may change the gain for at least one of the primary colors to a value higher than the set value.

  According to the above configuration, the display device according to this aspect includes an image to be displayed with high luminance when the luminance indicated by the luminance information included in the input HDR signal is higher than the first predetermined luminance. In this case, an image with priority on luminance is displayed. Therefore, when the input image signal is an HDR signal, the display device according to this aspect can display an image with high contrast.

  In the display device according to aspect 7 of the present invention, the display control unit according to any one of aspects 1 to 6 can adjust the luminance of the image to be displayed for each of the plurality of areas divided into the plurality of areas. When the luminance of the area having the highest luminance among the plurality of areas is higher than the second predetermined luminance, the display control unit sets a gain for at least one of the primary colors as a set value. It may be changed to a higher value.

  According to said structure, the display apparatus which concerns on this aspect can adjust the brightness | luminance of the image to display for the said several area divided | segmented into the several area (in other words, it has a local dimming function). ) When the luminance of the area with the highest luminance is higher than the second predetermined luminance, that is, when an image to be displayed with high luminance is included, an image with priority on luminance is displayed. Therefore, when the input image signal is an HDR signal, the display device according to this aspect can display an image with high contrast.

  A television receiver (1) according to aspect 8 of the present invention includes the display device according to any one of aspects 1 to 7.

  According to said structure, the television receiver which show | plays the effect equivalent to the display apparatus which concerns on either of the said aspects 1-7 is realizable.

  A display method according to an aspect 9 of the present invention is a display method for displaying an image on a display device that displays an image in which white balance is adjusted by setting a gain value for each primary color. In the determination step of determining whether the image signal is the first image signal or the second image signal having a wider dynamic range of possible brightness than the first image signal, and in the determination step, the image signal is A display control step of changing a gain for at least one of the primary colors to a value higher than a set value when it is determined that the image signal is the second image signal.

  According to said structure, the display method which concerns on this aspect has an effect equivalent to the display apparatus which concerns on the said aspect 1. FIG.

  The display device according to each aspect of the present invention may be realized by a computer. In this case, the display device is realized by the computer by operating the computer as each unit (software element) included in the display device. A control program for the display device and a computer-readable recording medium on which the control program is recorded also fall within the scope of the present invention.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

1 Television receiver (display device)
DESCRIPTION OF SYMBOLS 10 Image signal acquisition part 12 Discrimination part 14 Display control part 16 Display part 18 Storage part 20 Operation reception part

Claims (13)

A display device that displays an image with white balance adjusted by setting a gain value for each primary color,
A discriminating unit for discriminating whether the input image signal is the first image signal or the second image signal having a wider dynamic range of possible brightness than the first image signal;
A display control unit configured to change a gain for a primary color other than one of the primary colors to a value higher than a set value when the determination unit determines that the image signal is a second image signal; With
When the determination unit determines that the image signal is the second image signal, the display control unit is a gain value for at least one of the primary colors and is greater than a predetermined gradation value. Change the gain value at the high gradation value to a predetermined gain value higher than the set value,
The display control unit can further change at least one of the predetermined gradation value and the predetermined gain value.
A display device characterized by that. A display device that displays an image with white balance adjusted by setting a gain value for each primary color,
A discriminating unit for discriminating whether the input image signal is the first image signal or the second image signal having a wider dynamic range of possible brightness than the first image signal;
A display control unit configured to change a gain for a primary color other than one of the primary colors to a value higher than a set value when the determination unit determines that the image signal is a second image signal; With
When the determination unit determines that the image signal is the second image signal and the gradation value of the image indicated by the input image signal is higher than a predetermined gradation value, the display control unit Change the gain for at least one of the primary colors to a predetermined gain value higher than the set value,
The display control unit can further change at least one of the predetermined gradation value and the predetermined gain value.
A display device characterized by that. A display device that displays an image with white balance adjusted by setting a gain value for each primary color,
A discriminating unit for discriminating whether the input image signal is the first image signal or the second image signal having a wider dynamic range of possible brightness than the first image signal;
A display control unit configured to change a gain for a primary color other than one of the primary colors to a value higher than a set value when the determination unit determines that the image signal is a second image signal; With
When the determination unit determines that the image signal is a second image signal and the luminance indicated by the luminance information included in the input second image signal is higher than a predetermined luminance, the display control unit , Changing the gain for at least one of the primary colors to a predetermined gain value higher than the set value,
The display control unit can further change at least one of the predetermined luminance and the predetermined gain value.
A display device characterized by that. A display device that displays an image with white balance adjusted by setting a gain value for each primary color,
A discriminating unit for discriminating whether the input image signal is the first image signal or the second image signal having a wider dynamic range of possible brightness than the first image signal;
A display control unit configured to change a gain for a primary color other than one of the primary colors to a value higher than a set value when the determination unit determines that the image signal is a second image signal; With
The display control unit can adjust the luminance of the image to be displayed for each of the plurality of areas divided into a plurality of areas,
When the luminance of the area with the highest luminance among the plurality of areas is higher than a predetermined luminance, the display control unit has a predetermined gain higher than a set value with respect to at least one of the primary colors. Change the gain value to
The display control unit can further change at least one of the predetermined luminance and the predetermined gain value.
A display device characterized by that.   The display device according to claim 1, wherein the display control unit changes at least one of the predetermined gradation value and the predetermined gain value in accordance with an operation from a user. The display controller changes so that the gain value of each primary color at the maximum gradation value becomes the same value.
The display device according to claim 1, wherein the display device is a display device. Including the display device according to claim 1,
A television receiver characterized by that. A display method for displaying an image on a display device that displays an image adjusted for white balance by setting a gain value for each primary color,
A determining step of determining whether the input image signal is a first image signal or a second image signal indicating an image having a dynamic range wider than the dynamic range of the image indicated by the first image signal. When,
In the determination step, when it is determined that the image signal is the second image signal, the gain value for a primary color other than one of the primary colors is higher than a predetermined gradation value. A display control step for changing the gain value in the value to a predetermined gain value higher than the set value;
Including
In the display control step, at least one of the predetermined gradation value and the predetermined gain value can be changed.
A display method characterized by that. A display method for displaying an image on a display device that displays an image adjusted for white balance by setting a gain value for each primary color,
A determining step of determining whether the input image signal is a first image signal or a second image signal indicating an image having a dynamic range wider than the dynamic range of the image indicated by the first image signal. When,
In the determining step, when the image signal is determined to be the second image signal and the gradation value of the image indicated by the input image signal is higher than a predetermined gradation value, one of the primary colors A display control step of changing a gain for a primary color other than the primary color to a predetermined gain value higher than a set value;
Including
In the display control step, at least one of the predetermined gradation value and the predetermined gain value can be changed.
A display method characterized by that. A display method for displaying an image on a display device that displays an image adjusted for white balance by setting a gain value for each primary color,
A determining step of determining whether the input image signal is a first image signal or a second image signal indicating an image having a dynamic range wider than the dynamic range of the image indicated by the first image signal. When,
In the determining step, when the image signal is determined to be the second image signal and the luminance indicated by the luminance information included in the input second image signal is higher than a predetermined luminance, A display control step of changing a gain for a primary color other than one primary color to a predetermined gain value higher than a set value;
Including
In the display control step, at least one of the predetermined luminance and the predetermined gain value can be changed.
A display method characterized by that. A display method for displaying an image on a display device that displays an image adjusted for white balance by setting a gain value for each primary color,
A determining step of determining whether the input image signal is a first image signal or a second image signal indicating an image having a dynamic range wider than the dynamic range of the image indicated by the first image signal. When,
In the determination step, when it is determined that the image signal is the second image signal, a display control step of changing a gain for a primary color other than one of the primary colors to a value higher than a set value. When,
Including
In the display control step, the brightness of an image to be displayed can be adjusted for each of the plurality of areas divided into a plurality of areas.
In the display control step, when the luminance of the area having the highest luminance among the plurality of areas is higher than a predetermined luminance, the gain for at least one of the primary colors is higher than a set value. Change the gain value to
In the display control step, at least one of the predetermined luminance and the predetermined gain value can be changed.
A display method characterized by that.   A control program for causing a computer to function as the display device according to any one of claims 1 to 4, wherein the control program causes the computer to function as the determination unit and the display control unit.   A computer-readable recording medium on which the control program according to claim 12 is recorded.

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