JP5147311B2 - Video signal processing device, video signal processing method, program, and display device - Google Patents

Description

  The present invention relates to a video signal processing device, a video signal processing method, a program, and a display device.

  In recent years, as a display device replacing a CRT display (Cathode Ray Tube display), an OLED display (Organic Light Emitting Diode display; also referred to as an organic EL display (Organic ElectroLuminescence display)), FED (Field Emission Display). Various self-luminous display devices such as PDP (Plasma Display Panel) have been developed.

  In the development of various display devices as described above, it is a technical goal to achieve high image quality with low power consumption. Under such circumstances, techniques for improving image quality while reducing power consumption have been developed. As a technique for reducing power consumption by always lowering the luminance toward the edge of the screen when the video is displayed on the screen, the physical center point of the screen is always used as a base point.

Japanese Patent No. 3115727

  However, a conventional display device using a technique for reducing the luminance toward the edge of the screen with the physical center point of the screen as a base point is what the video (or image) indicated by the input video signal is. Even so, the video signal is always processed so that the luminance decreases toward the edge of the screen from the physical center point of the screen. Therefore, in the conventional display device, no consideration is given to what kind of video the input video signal represents, and depending on the video indicated by the input video signal (that is, the video that is actually displayed). In some cases, image quality may be reduced along with reduction in power consumption. Hereinafter, problems in the conventional display device will be described with reference to FIG.

(Problems with conventional display devices)
FIG. 1 is an explanatory diagram for explaining a problem in a conventional display device. The conventional display device is based on the premise that important information in the displayed video exists in the center of the screen, and reduces power consumption by reducing the brightness toward the edge of the screen without reducing the brightness of the center. Reduction and high image quality.

  However, as shown in FIG. 1A, the video displayed on the conventional display device does not always include important information (for example, a person) in the center of the screen. Here, the conventional display device is a case where a person (important information) as shown in FIG. 1A receives a video signal for displaying a video shown at the right end of the screen. The video signal is always processed so that the luminance decreases toward the edge of the screen from the physical center point of the screen as a base point. That is, as shown in FIG. 1B, the conventional display device displays an image in which the luminance of a portion where important information (for example, a person) is displayed is lowered. Accordingly, in the conventional display device, there is a case where image quality is deteriorated as well as power consumption is reduced by luminance control.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a novel device capable of reducing power consumption and improving image quality by controlling luminance based on an input video signal. Another object of the present invention is to provide an improved video signal processing device, video signal processing method, program, and display device.

In order to achieve the above object, according to a first aspect of the present invention, an average brightness for dividing a display screen into a plurality of divided areas and calculating an average brightness for each of the divided areas based on an input video signal. A calculation unit, a correction center setting unit that sets a correction center position based on the average luminance for each of the divided areas, and a correction value that sets a correction value according to the display position of the display screen, with the correction center position as a base point Bei example a setting unit, and a gain adjustment unit which adjusts the gain of the video signal based on the correction value,
When the correction center position changes abruptly with a transition of one frame, an intermediate correction center position is provided between the correction center position before the change and the correction center position after the change, and the intermediate correction center position for each frame. Sequentially to the correction center position,
A video signal processing apparatus is provided.

  The video signal processing apparatus can include an average luminance calculation unit, a correction center setting unit, a correction value setting unit, and a gain adjustment unit. The average luminance calculation unit divides a display screen that displays a video (or an image, which will be described below as a video signal that can indicate a corresponding video or image) indicated by an input video signal. It is possible to calculate the average luminance for each divided region based on the input video signal by dividing into regions. The correction center setting unit can set the correction center position based on the average luminance for each divided region. The correction value setting unit can set a correction value according to the display position of the display screen using the correction center position set in the correction center setting unit as a base point. Here, for example, the correction value setting unit can set a correction value for attenuating the gain toward the periphery of the display screen with the correction center position as the center. The gain adjustment unit can adjust the gain of the input video signal based on the correction value according to the display position of the display screen set by the correction value setting unit. With this configuration, the video signal processing apparatus can control the luminance of the video signal so that the image quality can be improved while suppressing power consumption when displayed on the display screen.

  The correction value setting unit may set a correction value that attenuates the gain of the video signal toward the screen edge of the display screen, with the correction center position as a base point.

  With this configuration, the luminance of the video signal can be controlled so that the image quality can be improved while suppressing power consumption when displayed on the display screen.

  The correction value setting unit may change the gain attenuation rate of the video signal in accordance with a deviation amount of the correction center position with respect to a predetermined reference position.

  With such a configuration, it is possible to further improve the image quality.

  The correction value setting unit corresponds to the first correction center position when the correction center position set by the correction center setting unit changes from the first correction center position to the second correction center position. The correction value may be changed stepwise from the correction value to the correction value corresponding to the second correction center position.

  With such a configuration, it is possible to further improve the image quality.

  The correction center setting unit may set the center point of the divided area having the maximum average luminance for each divided area as the correction center position.

  With this configuration, the luminance of the video signal can be controlled so that the image quality can be improved while suppressing power consumption when displayed on the display screen.

  The correction center setting unit may set a preset preset position as the correction center position when there are a plurality of divided areas in which the average luminance for each of the divided areas is maximized.

  With this configuration, the luminance of the video signal can be controlled so that the image quality can be improved while suppressing power consumption when displayed on the display screen.

In order to achieve the above object, according to the second aspect of the present invention, the display screen is divided into a plurality of divided areas, and the average luminance for each of the divided areas is calculated based on the input video signal. A step of setting a correction center position based on the average luminance for each of the divided regions, a step of setting a correction value according to the display position of the display screen using the correction center position as a base point, and the correction value Adjusting the gain of the video signal based on:
When the correction center position changes abruptly with a transition of one frame, an intermediate correction center position is provided between the correction center position before the change and the correction center position after the change, and the intermediate correction center position for each frame. Are sequentially provided as correction center positions .

  By using this method, the luminance of the video signal can be controlled so that the image quality can be improved while suppressing power consumption when displayed on the display screen.

In order to achieve the above object, according to the third aspect of the present invention, the display screen is divided into a plurality of divided areas, and the average luminance for each of the divided areas is calculated based on the input video signal. A step of setting a correction center position based on the average luminance for each of the divided areas, a step of setting a correction value according to the display position of the display screen using the correction center position as a base point, and based on the correction value A step of adjusting the gain of the video signal; when the correction center position changes suddenly in one frame transition, an intermediate correction center position is provided between the correction center position before the change and the correction center position after the change. Sequentially setting the intermediate correction center position for each frame as the correction center position;
A program for causing a computer to execute is provided.

  With this program, the luminance of the video signal can be controlled so that the image quality can be improved while suppressing power consumption when displayed on the display screen.

In order to achieve the above object, according to a fourth aspect of the present invention, there is provided a self-luminous display device that corrects an input video signal, and the video signal correction unit. A video display unit that displays a video on a display screen based on the corrected video signal, and the video signal correction unit divides the display screen into a plurality of divided regions, and the video signal correction unit An average luminance calculation unit that calculates an average luminance for each divided region, a correction center setting unit that sets a correction center position based on the average luminance for each divided region, and display of the display screen based on the correction center position e Bei a correction value setting unit for setting a correction value corresponding to the position, and a gain adjustment unit which adjusts the gain of the video signal based on the correction value,
When the correction center position changes abruptly with a transition of one frame, an intermediate correction center position is provided between the correction center position before the change and the correction center position after the change, and the intermediate correction center position for each frame. Are sequentially displayed as correction center positions .

  The display device may include a video signal correction unit and a video display unit. The video signal correction unit can include an average luminance calculation unit, a correction center setting unit, a correction value setting unit, and a gain adjustment unit, and sets a correction center position based on an input video signal, The gain of the video signal can be corrected according to the display position on the display screen with the correction center position as a base point. Here, for example, the video signal correction unit can set a correction value for attenuating the gain toward the periphery of the display screen with the correction center position as the center. The video display unit can display a video on the display screen based on the video signal corrected by the video signal correction unit. Here, the video display unit has pixels arranged in a matrix, for example, and each pixel emits light by voltage / current applied according to the video signal, thereby displaying the video on the display screen. Can do. With this configuration, the display device can control luminance based on an input video signal to reduce power consumption and improve image quality.

  According to the present invention, it is possible to reduce power consumption and improve image quality by controlling luminance based on an input video signal.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

(Outline of processing in the video signal processing apparatus according to the embodiment of the present invention)
First, an outline of processing in the video signal processing apparatus according to the embodiment of the present invention will be described. FIG. 2 is an explanatory diagram for explaining an outline of processing in the video signal processing apparatus according to the embodiment of the present invention. The outline of the processing shown below applies not only to the video signal processing device according to the embodiment of the present invention but also to the display device according to the embodiment of the present invention.

  The video signal processing apparatus according to the embodiment of the present invention corrects the video signal based on the input video signal (hereinafter referred to as “correction”) in order to suppress the occurrence of the problem as shown in FIG. "Center position") is set as appropriate, and the gain of the video signal is continuously attenuated toward the end of the display screen around the set correction center position. Here, the “continuous” according to the embodiment of the present invention may include a pseudo continuation by collecting discrete values.

  More specifically, the video signal processing apparatus according to the embodiment of the present invention can process video signals as shown in the following (I) to (III).

(I) Correction center position selection process 1
As shown in FIG. 2A, a display screen that displays an image indicated by an input video signal is divided into a plurality of divided areas, and the average luminance of the video signal is determined for each divided area based on the input video signal. calculate.

  2A shows an example in which the area is divided into 24 areas A1 to A24. Needless to say, the number of divided areas according to the embodiment of the present invention is not limited to 24 areas. In addition, the number of divided areas according to the embodiment of the present invention may be, for example, a predetermined number, or a user input from a user who uses the video signal processing apparatus or a resolution of an input video signal It may be set appropriately according to the above.

(II) Correction center position selection process 2
Of the average luminance calculated for each divided region, the center position of the divided region having the highest average luminance is set as the correction center position of the video signal (in principle processing). For example, when there are a plurality of divided areas with the highest average luminance, a preset preset position may be set as the correction center position of the video signal (exception processing).

(III) Video Signal Correction Process As shown in FIG. 2B, the gain of the video signal is continuously attenuated toward the edge of the display screen with the set correction center position as the center to adjust the luminance. Here, FIG. 2B shows an example in which the divided area A8 is set as the correction center position.

  The video signal processing apparatus according to the embodiment of the present invention controls the luminance by performing the processes shown in FIG. 2 and (I) to (III) above, and consumes when displaying an image corresponding to the video signal. Electric power can be reduced. Further, the video signal processing apparatus according to the embodiment of the present invention can set the correction center position to a position where the average luminance is high (that is, the center position of a region where there is a high possibility that important information exists) The occurrence of the problem as shown in FIG. 1B can be suppressed.

  In addition, the display device according to the embodiment of the present invention can display an image and a video corresponding to the video signal whose luminance is controlled, similarly to the video signal processing device according to the embodiment of the present invention. Therefore, the display device according to the embodiment of the present invention can suppress the occurrence of the problem as shown in FIG. 1B, similarly to the video signal processing device according to the embodiment of the present invention. Therefore, the display device according to the embodiment of the present invention can reduce the power consumption and improve the image quality by controlling the luminance based on the input video signal.

  Hereinafter, the configuration of the video signal processing device and the display device according to the embodiment of the present invention will be described in more detail.

(Video signal processing apparatus according to the embodiment)
FIG. 3 is a block diagram showing an example of the video signal processing apparatus 100 according to the embodiment of the present invention. Here, although one video signal is shown in FIG. 3, the embodiment of the present invention is not limited to such a configuration. For example, the input video signal is an independent signal for each of R, G, and B colors. Also good.

  In the following description, the video signal input to the video signal processing apparatus 100 is described as being a digital signal used in, for example, digital broadcasting. However, the video signal is not limited to the above, and an analog signal used in analog broadcasting, for example. It can also be. Note that the video signal input to the video signal processing apparatus 100 according to the embodiment of the present invention can be transmitted from a broadcasting station and received by the video signal processing apparatus 100, for example, but is not limited thereto. . For example, the video signal input to the video signal processing device 100 according to the embodiment of the present invention is transmitted from an external device via a network such as a LAN (Local Area Network) and received by the video signal processing device 100. Alternatively, the video signal processing apparatus 100 may read a video file or an image file held in a storage unit included in the video signal processing apparatus 100.

  Referring to FIG. 3, the video signal processing apparatus 100 may include an average luminance calculation unit 102, a correction center setting unit 104, a correction value setting unit 106, and a gain adjustment unit 108.

  In addition, the video signal processing device 100 includes, for example, a control unit (not shown) configured by an MPU (Micro Processing Unit) or the like that can control the entire video signal processing device 100, a program used by the control unit, ROM (Read Only Memory; not shown) in which control data such as calculation parameters are recorded, RAM (Random Access Memory; not shown) that primarily stores programs executed by the control unit, and average luminance calculation unit 102 A storage unit (not shown) capable of storing data used for calculating average luminance in the correction value and setting correction values in the correction value setting unit 106, and a receiving unit (not shown) for receiving a video signal transmitted from a broadcasting station or the like. Or an operation unit (not shown) that can be operated by the user. The video signal processing apparatus 100 can connect the above-described constituent elements by, for example, a bus as a data transmission path. Here, as a storage unit (not shown), for example, a magnetic recording medium such as a hard disk, a nonvolatile memory such as a flash memory, a magneto-optical disk (Magneto Optical Disk) ) Etc., but is not limited to the above. In addition, examples of the operation unit (not shown) include operation input devices such as a keyboard and a mouse, buttons, direction keys, and combinations thereof, but are not limited thereto. Absent.

  The average luminance calculation unit 102 calculates an average value of luminance in a predetermined period based on the input video signal. The predetermined period in which the average luminance calculation unit 102 calculates the average luminance is, for example, one frame period, but is not limited to the above. It can also be a period. Hereinafter, the predetermined period in which the average luminance calculation unit 102 calculates the average luminance will be described as one frame period.

  Further, as shown in FIG. 2A, the average luminance calculation unit 102 divides a display screen that displays an image indicated by the input video signal into a plurality of divided areas, and performs the division based on the input video signal. The average luminance of the video signal can be calculated for each region. Information such as the number and size of the divided areas used by the average luminance calculation unit 102 to calculate the average luminance may be stored in the storage unit, for example, provided in the average luminance calculation unit 102. Here, as the storage means included in the average luminance calculation unit 102, for example, EEPROM (Electronically Erasable and Programmable Read Only Memory), flash memory, MRAM (Magnetoresistive Random Access Memory), FeRAM (Ferroelectric Random Access Memory), PRAM (Phase non-volatile memory such as change Random Access Memory), but is not limited to the above. Information such as the number and size of the divided areas used by the average luminance calculation unit 102 to calculate the average luminance is stored in, for example, a storage unit (not shown) of the video signal processing device 100, and the average luminance calculation unit It goes without saying that 102 may appropriately read from the storage unit (not shown).

  As a method for calculating the average luminance in the predetermined period calculated by the average luminance calculation unit 102, for example, an arithmetic average is used. However, the average luminance is not limited to the above. You can also.

  The correction center setting unit 104 sets the correction center position based on the average luminance calculated for each divided region by the average luminance calculation unit 102. Here, the correction center setting unit 104 can set the correction center position in accordance with, for example, the following (A) and (B).

(A) Principle processing The average luminances of the divided areas calculated by the average luminance calculating unit 102 are compared, and the center position of the divided area having the highest average luminance is set as the correction center position.

  For example, the correction center setting unit 104 temporarily selects one divided region as a selection candidate region, compares the average luminance of the one divided region with the average luminance of the other divided regions, and selects a divided region having a high average luminance. Let it be a new selection candidate area. By repeating the above comparison, the correction center setting unit 104 can specify a divided region having the highest average luminance. Further, when the average luminance of one divided region is equal to the average luminance of the other divided regions, for example, a flag indicating that there are a plurality of divided regions having the average luminance value can be set (naturally) When the average luminance value is updated, the flag is canceled.) Here, for example, the correction center setting unit 104 includes a storage unit, and the storage unit stores various information such as the divided areas to be compared by the correction center setting unit 104, the average luminance value of each divided region, and the flag. May be. Examples of the storage means included in the correction center setting unit 104 include volatile memory such as SDRAM (Synchronous Dynamic Random Access Memory) and SRAM (Static Random Access Memory), but are not limited thereto. It may be a non-volatile memory such as a flash memory. Needless to say, the method of comparing the average luminance in the correction center setting unit 104 is not limited to the above.

(B) Exception processing: when there are a plurality of divided regions with the highest average luminance As a result of the principle processing shown in (A) above, if there are a plurality of divided regions with the highest average luminance, a preset region is set. The preset position is set as the correction center position.

  Here, examples of the preset position include the position of the mechanical center of the display screen that displays the image corresponding to the video signal (that is, the position of the physical center point of the display screen), but are not limited thereto. Absent. Further, the preset position can be a fixed position, for example, but is not limited thereto. For example, the preset position may be appropriately changed according to a user input from an operation unit (not shown) of the video signal processing apparatus 100.

  The correction value setting unit 106 sets a correction value for correcting the video signal based on the correction center position set by the correction center setting unit 104 according to the display position of the display screen that displays an image corresponding to the video signal. Set. Hereinafter, a correction value setting method in the correction value setting unit 106 will be described.

[First correction value setting method]
FIG. 4 is an explanatory diagram for explaining a first correction value setting method in the correction value setting unit 106 according to the embodiment of the present invention. 4A shows a display screen that displays an image corresponding to the video signal, and FIG. 4B shows a display position (Position) of the display screen shown in FIG. 4A. And the target gain (Gain) after correction of the video signal. In FIG. 4, the target gain (Gain) at each display position corresponds to the correction value set by the correction value setting unit 106.

  Referring to FIG. 4A, the center position of the divided area A8 is set as the correction center position C1. At this time, as shown in FIG. 4B, the correction value setting unit 106 sets a correction value that attenuates the gain toward the end of the display screen with the correction center position C1 as a base point. In FIG. 4B, the horizontal direction is shown as an example of the display position (Position). However, in the vertical direction, the gain is attenuated toward the end of the display screen using the correction center position as a base point. Can do. Therefore, the correction value setting unit 106 can set a correction value for attenuating the gain from the correction center position toward the periphery.

  As shown in FIG. 4B, the correction value setting unit 106 using the first correction value setting method sets the distance (d1, d2) from the correction center position C1 to the display screen edge and the gain reduction width g1. It is possible to set a correction value according to the display position (Position) of the display screen.

  Further, the gain reduction width g1 can be defined by a preset upper limit value and lower limit value of the gain. For example, in FIG. 4B, “1.0” is set as the upper limit value, and the gain of the video signal does not change at the correction center position C1. FIG. 4B shows an example in which “0.8” is set as the lower limit value. Needless to say, the upper and lower limits according to the embodiment of the present invention are not limited to the above. In addition, the upper limit value and the lower limit value of the gain can be fixed values, but are not limited to the above values. For example, in response to a user input from an operation unit (not shown) of the video signal processing apparatus 100. May be changed as appropriate.

  Information such as the upper limit value and the lower limit value used by the correction value setting unit 106 to set the correction value can be stored in the storage unit, for example, provided in the correction value setting unit 106. Here, examples of the storage unit included in the correction value setting unit 106 include a nonvolatile memory such as an EEPROM or a flash memory, but are not limited thereto. Information such as information such as an upper limit value and a lower limit value used by the correction value setting unit 106 to set the correction value is stored in, for example, a storage unit (not shown) of the video signal processing device 100, and the correction value is set. It goes without saying that the setting unit 106 may appropriately read from the storage unit (not shown).

  Therefore, the correction value setting unit 106 uses the first correction value setting method to set a correction value that attenuates the gain of the video signal toward the screen edge portion of the display screen using the correction center position as a base point. Can do.

[Second correction value setting method]
The first correction value setting method shown in FIG. 4 shows a method of setting a correction value that attenuates the gain of the video signal corresponding to the display screen edge to the lower limit value of the gain regardless of the correction center position. However, the correction value setting method according to the embodiment of the present invention is not limited to the first correction value setting method shown in FIG. Then, next, a method for changing the lower limit value of the gain according to the correction center position will be described as a second correction value setting method.

  FIG. 5 is an explanatory diagram for explaining a second correction value setting method in the correction value setting unit 106 according to the embodiment of the present invention. Here, FIG. 5A shows a display screen for displaying an image corresponding to the video signal, as in FIG. 5B shows the relationship between the display position (Position) of the display screen shown in FIG. 5A and the target gain (Gain) after correction of the video signal, as in FIG. 4B. ing.

  Referring to FIG. 5A, the center position of the divided area A8 is set as the correction center position C1. At this time, as in the first correction value setting method, the correction value setting unit 106 sets a correction value that attenuates the gain toward the end of the display screen with the correction center position C1 as a base point.

  Here, referring to FIG. 5B, the lower limit value L of the video signal gain corresponding to the display screen end Left is different from the lower limit value 0.8 of the video signal gain corresponding to the display screen end Right. I understand that. If the lower limit value of the gain of the video signal is the same between the display screen edge Left and the display screen edge Right, the luminance of one display screen edge may be extremely lowered depending on the position of the correction center position. This is because there is (that is, the gain attenuation rate increases).

  Therefore, the correction value setting unit 106 using the first correction value setting method appropriately sets the lower limit value of the gain of the video signal in accordance with the “deviation amount” of the correction center position with respect to the predetermined reference position. Change the attenuation factor of the video signal gain.

  Here, the “deviation amount” can be determined using, for example, the center position of the display screen (Center in FIG. 5B) as the reference position. For example, in FIG. 5B, the amount of deviation is represented by z. Note that the shift amount according to the embodiment of the present invention is a value corresponding to a distance corresponding to one direction of the display screen (for example, the horizontal direction of the display screen) as the shift amount z in FIG. However, it is not limited to the above, and may be, for example, a Euclidean distance between a reference position (for example, a mechanical center) and a correction center position.

  The correction value setting unit 106 uses, for example, a look-up table (Look Up Table) in which the shift amount z and the lower limit value L of the gain are associated with each other, and the lower limit value L of the gain corresponding to the determined shift amount z. Can be set. Information such as a lookup table used by the correction value setting unit 106 to set the correction value can be stored in, for example, a storage unit included in the correction value setting unit 106. It may be appropriately read from 100 storage units (not shown). The means for setting the lower limit L of the gain according to the embodiment of the present invention is not limited to the above, and for example, the lower limit of the gain is obtained by adding a value corresponding to the shift amount to the preset lower limit of the gain. L can also be set.

  As in the case of using the first correction value setting method, the correction value setting unit 106 using the second correction value setting method and the distance (d1, d2) from the correction center position C1 to the display screen edge and the gain The correction value corresponding to the display position (Position) of the display screen can be set using the gain reduction width g2 defined by the reduction width g1 and the lower limit value L of the gain.

  Therefore, the correction value setting unit 106 uses the second correction value setting method to set a correction value that attenuates the gain of the video signal toward the screen edge of the display screen using the correction center position as a base point. Can do.

[Third correction value setting method]
When there are a plurality of divided areas with the highest average luminance, the correction center setting unit 104 can set a preset preset position as the correction center position (exception processing). Therefore, next, as a third correction value setting method, a correction value setting method when exception processing is performed in the correction center setting unit 104 will be described.

  FIG. 6 is an explanatory diagram for explaining a third correction value setting method in the correction value setting unit 106 according to the embodiment of the present invention. Here, FIG. 6A shows a display screen for displaying an image corresponding to the video signal, as in FIG. 6B shows the relationship between the display position (Position) of the display screen shown in FIG. 6A and the target gain (Gain) after correction of the video signal, as in FIG. 4B. ing.

  FIG. 6A shows a case where the divided areas with the highest average luminance are A8 and A18, and the correction center position C0 (preset position) is the position of the mechanical center on the display screen as a base point for correcting the video signal. (That is, the position of the physical center point of the display screen). At this time, as in the first correction value setting method, the correction value setting unit 106 sets a correction value that attenuates the gain toward the end of the display screen with the correction center position C0 as a base point. Note that the preset position according to the embodiment of the present invention is not limited to the position of the mechanical center on the display screen shown in FIG. 6, and can be set to an arbitrary position on the display screen, for example. In addition, the preset position according to the embodiment of the present invention may be, for example, a predetermined fixed position, or may be appropriately set (changed) according to user input from a user who uses the video signal processing device. May be.

  As shown in FIG. 6B, the correction value setting unit 106 using the third correction value setting method uses the distance (d0) from the correction center position C0 to the display screen end and the gain reduction width g1. A correction value corresponding to the display position (Position) of the display screen can be set.

  Therefore, the correction value setting unit 106 uses the third correction value setting method to set a correction value that attenuates the gain of the video signal toward the screen edge portion of the display screen using the correction center position as a base point. Can do.

[Fourth correction value setting method]
The correction value setting unit 106 according to the embodiment of the present invention sets a correction value according to the correction center position for each frame period (predetermined period) by using the first to third correction value setting methods described above. can do. Therefore, the video signal processing apparatus 100 uses the first to third correction value setting methods described above to reduce the image quality of the image displayed on the display screen in each frame while reducing the power consumption in each frame. Can be suppressed. As described above, the correction value setting unit 106 can set a correction value suitable for correcting the video signal for each frame by using the first to third correction value setting methods described above. However, even if an appropriate correction value is set for each frame, an unexpected problem may occur in terms of image quality when viewed in a plurality of frames.

[Problems covered by the fourth correction value setting method]
FIG. 7 is an explanatory diagram for explaining a problem targeted by the fourth correction value setting method in the correction value setting unit 106 according to the embodiment of the present invention. FIGS. 7A and 7B show the correction center position and correction value in a certain frame, and FIGS. 7C and 7D show the next frame of the frame shown in FIGS. 7A and 7B. The correction center position and the correction value are shown.

  For example, as shown in FIG. 7, the correction center position changes from the correction center position C1 (FIG. 7 (a); first correction center position) of the divided area A8 to the correction center position C2 of the divided area A11 (FIG. 7 (c); In the case of changing to (second correction center position), the correction value corresponding to the display position on the display screen is also set to that corresponding to each correction center position. However, as is apparent from a comparison between FIG. 7B and FIG. 7D, the correction value corresponding to the display position on the display screen may change abruptly at the transition of one frame.

  As shown in FIG. 7, when the correction value corresponding to the display position of the display screen changes abruptly by transition of one frame, a change in luminance appears on the display screen. Therefore, in the above case, even if correction of the video signal suitable for each frame is performed, there is a possibility that the quality of the video displayed on the display screen is deteriorated.

  Then, the 4th correction value setting method which can suppress generation | occurrence | production of the said problem as shown in FIG. 7 next is demonstrated.

[Problem solving approach of the fourth correction value setting method]
FIG. 8 is an explanatory diagram for explaining a fourth correction value setting method in the correction value setting unit 106 according to the embodiment of the present invention.

  In the fourth correction value setting method, the correction value is changed stepwise in order to suppress the occurrence of the above problem as shown in FIG. For example, FIG. 8 is a step in four frame periods from the correction center position C1 (first correction center position) shown in FIG. 7A to the correction center position C2 (second correction center position) shown in FIG. 7C. This is an example of changing the pattern.

  When the correction center position changes from the correction center position C1 to the correction center position C2, the correction value setting unit 106 using the fourth correction value setting method, for example, has an intermediate correction center obtained by dividing the distance between C1 and C2 into four equal parts. The position ("C1-1" to "C1-3" in FIG. 8) is determined. The correction value setting unit 106 sets a correction value based on the intermediate correction center position C1-1 in the first frame (FIG. 8B), and uses the intermediate correction center position C1-2 as the base point in the second frame. A correction value is set (FIG. 8C). Similarly, the correction value setting unit 106 sets a correction value with the intermediate correction center position C1-3 as a base point in the third frame (FIG. 8D), and the target correction center position in the fourth frame. A correction value with a certain correction center position C2 as a base point is set (FIG. 8E).

  Therefore, the correction value setting unit 106 using the fourth correction value setting method can prevent the correction value from changing suddenly at the transition of one frame as shown in FIG. 7, and as shown in FIG. The occurrence of the above problems can be suppressed.

  Further, FIG. 8 shows an example in which the correction value is set by changing the correction center position stepwise from the correction center position C1 to the correction center position C2 in four frame periods. The correction center position to be changed may change (that is, the correction center setting unit 104 sets a new correction center position). In the above case, the correction value setting unit 106 determines a new intermediate correction center position from, for example, the correction center position in the current frame and the new correction center position set by the correction center setting unit 104, thereby correcting the correction value. Can be set.

  Information such as the correction center position in the current frame used for setting the correction value by the correction value setting unit 106, the target correction center position (the correction center position set by the correction center setting unit 104), the intermediate correction center position, and the like For example, the correction value setting unit 106 includes a storage unit and can be held in the storage unit. Here, examples of the storage unit included in the correction value setting unit 106 include a volatile memory such as SDRAM and SRAM, but are not limited to the above, and may be a non-volatile memory such as a flash memory. For example, the correction value setting unit 106 may record the various types of information in a storage unit (not shown) of the video signal processing apparatus 100 and appropriately read the various types of information from the storage unit (not shown). Needless to say.

[Fifth correction value setting method]
The correction value setting unit 106 appropriately corrects the above-described first to fourth correction value setting methods to correct the gain of the video signal toward the screen edge of the display screen using the correction center position as a base point. Can be set.

  By using the first to fifth correction value setting methods described above, the correction value setting unit 106 uses the correction center position as a base point to calculate a correction value that attenuates the gain of the video signal toward the screen edge of the display screen. Can be set. Therefore, the correction value setting unit 106 can set a correction value according to the display position of the display screen.

  The video signal processing apparatus 100 will be described again with reference to FIG. The gain adjustment unit 108 adjusts the gain of the input video signal using the correction value set by the correction value setting unit 106. More specifically, the gain adjustment unit 108 attenuates the gain of the video signal, for example, by multiplying the video signal by a correction value corresponding to the display position of the display screen set by the correction value setting unit 106. .

  In addition, the gain adjustment unit 108 stores, for example, a lookup table in which the display position of the display screen is associated with the correction value, and reads a correction value corresponding to the display position of the display screen from the lookup table. it can. Here, the gain adjusting unit 108 can update the value of the correction value in the lookup table every time the correction value is transmitted from the correction value setting unit 106.

  Here, for example, the look-up table used by the gain adjusting unit 108 to adjust the gain of the video signal can be held in the storing unit. Examples of the storage means included in the gain adjustment unit 108 include a nonvolatile memory such as an EEPROM or a flash memory, but are not limited thereto. Note that the look-up table used by the gain adjusting unit 108 to adjust the gain of the video signal is stored in, for example, a storage unit (not shown) of the video signal processing device 100, and the gain adjusting unit 108 sets the correction value. Needless to say, the information may be appropriately updated and may be appropriately read from the storage unit (not shown).

  The gain adjusting unit 108 can output the video signal whose gain has been adjusted, for example, to a display device including a display screen for displaying video. The output destination from which the gain adjusting unit 108 outputs the video signal whose gain has been adjusted is not limited to the above. For example, the gain adjustment unit 108 can store a video signal whose gain has been adjusted in a storage unit (not shown) included in the video signal processing apparatus 100, or a PC (Personal) via a wired / wireless network or the like. To an external computer such as Computer).

  As described above, the video signal processing apparatus 100 according to the embodiment of the present invention calculates the average luminance for each divided region based on the input video signal, and calculates the average luminance based on the calculated average luminance for each divided region. The correction center position is set at the center point of the divided area having the highest (basic processing). The video signal processing apparatus 100 sets a correction value that attenuates the gain of the video signal toward the screen edge of the display screen with the set correction center position as a base point. Then, the video signal processing apparatus 100 corrects (attenuates) the gain of the video signal by multiplying the input video signal by a correction value corresponding to the set display position of the display screen. The video signal processing apparatus 100 sets the luminance of the divided region having the highest average luminance (that is, the region where there is a high possibility that important information exists) to be the highest, and moves from the correction center position to the screen edge of the display screen. Since the gain of the video signal can be corrected so that the luminance decreases toward the screen, when the video (or image) indicated by the video signal corrected by the video signal processing apparatus 100 is displayed on the display screen, FIG. The occurrence of problems in the conventional display device as shown in FIG. Therefore, the video signal processing apparatus 100 can control the luminance of the video signal so that the image quality can be improved while suppressing power consumption when displayed on the display screen.

  Further, the video signal processing apparatus 100 can appropriately change the attenuation factor of the gain of the video signal in accordance with the amount of deviation of the set correction center position with respect to a predetermined reference position. Therefore, the video signal processing apparatus 100 can control the luminance of the video signal so as to achieve higher image quality.

  Further, the video signal processing apparatus 100 can change the correction value stepwise in order to prevent the image quality from being deteriorated due to a sudden change in luminance when displayed on the display screen. Therefore, the video signal processing apparatus 100 can control the luminance of the video signal so as to achieve higher image quality.

  In the embodiments of the present invention, the video signal processing apparatus 100 has been described. However, the embodiments of the present invention are not limited to such forms, and for example, self-luminous display devices such as PDPs, OLED displays, and FEDs. It can also be applied to computers such as PCs and servers, and portable communication devices such as mobile phones. The application to the display device will be described later.

(Program related to video signal processing apparatus 100)
The luminance of the video signal is controlled by a program for causing the video signal processing apparatus 100 according to the embodiment of the present invention to function as a computer so that power consumption can be reduced and image quality can be improved based on the input video signal. be able to.

(Video signal processing method according to an embodiment of the present invention)
Next, a video signal processing method according to an embodiment of the present invention will be described. FIG. 9 is a flowchart showing an example of the video signal processing method according to the embodiment of the present invention. In the following, the video signal processing method in the video signal processing apparatus 100 will be described. However, the video signal processing method according to the embodiment of the present invention can be applied to the display apparatus according to the embodiment of the present invention described later. it can.

  When the video signal is input, the video signal processing apparatus 100 calculates an average luminance for each divided region (S100). Here, the average luminance for each divided region in step S100 can be, for example, the average luminance in one frame period, but is not limited thereto. The average luminance in step S100 can be calculated using, for example, an arithmetic average, but is not limited to the above, and can be calculated using, for example, a geometric average or a weighted average.

  The video signal processing apparatus 100 sets the correction center position based on the average luminance for each divided area calculated in step S100 (S102). In step S102, the video signal processing apparatus 100 can set, for example, the center point of the divided area having the highest average luminance as the correction center position. In addition, when there are a plurality of divided regions with the highest average luminance, the video signal processing apparatus 100 can set, for example, a preset preset position as the correction center position. Here, examples of the preset position include the position of a mechanical center on a display screen that displays an image corresponding to a video signal, but are not limited thereto.

  The video signal processing apparatus 100 sets a correction value according to the display position of the display screen when displaying the image indicated by the video signal on the display screen based on the correction center position set in step S102 (S104). Here, the setting of the correction value in step S104 can be performed using, for example, the first to fifth correction value setting methods described above.

  Based on the correction value set in step S104, the video signal processing apparatus 100 adjusts the gain of the input video signal (S106). Here, in step S104, a correction value that attenuates the gain toward the edge of the display screen is set with the correction center position as a base point. Therefore, the video signal adjusted in step S106 is the edge of the display screen. The gain corresponding to the video signal corresponding to the part is attenuated.

  As described above, in the video signal processing method according to the embodiment of the present invention, the average luminance for each divided region is calculated based on the input video signal, and the correction center position is calculated based on the calculated average luminance for each divided region. Set. Then, a correction value corresponding to the display position on the display screen is set using the set correction center position as a base point, and the gain of the video signal input is adjusted based on the set correction value. Therefore, by using the video signal processing method according to the embodiment of the present invention, the video signal processing apparatus 100 can obtain the brightness of the divided area having the highest average brightness (that is, the area where there is a high possibility that important information exists). Since the gain of the video signal can be corrected so that the luminance decreases toward the screen edge of the display screen with the correction center position as the base point, the video indicated by the video signal corrected by the video signal processing apparatus 100 can be corrected. When (or image) is displayed on the display screen, it is possible to prevent a problem from occurring in the conventional display device as shown in FIG.

  Therefore, the video signal processing method according to the embodiment of the present invention can control the luminance of the video signal so that the image quality can be improved while suppressing power consumption when displayed on the display screen.

(Display Device According to Embodiment)
Next, a display device to which the video signal processing device according to the embodiment of the present invention is applied will be described.

  FIG. 10 is a block diagram showing the display device 200 according to the embodiment of the present invention. 10 is one embodiment of the display device according to the embodiment of the present invention, and it is needless to say that the embodiment of the present invention is not limited to the configuration of FIG. In the following description, it is assumed that the video signal input to the display device 200 is a digital signal used in digital broadcasting, for example. However, the video signal is not limited to the above, and is an analog signal used in analog broadcasting, for example. You can also

  Referring to FIG. 10, the display device 200 may include a video signal correction unit 202 and a video display unit 204.

  The display device 200 includes, for example, an MPU or the like, and can control a display device control unit (not shown) that can control the entire display device 200, and controls programs and calculation parameters used by the display device control unit. ROM (not shown) in which data is recorded, RAM (not shown) for temporarily storing a program executed by the display device control unit, data used for video signal correction in the video signal correction unit 202, and the like. A display device storage unit (not shown) that can be stored, a display device operation unit (not shown) that can be operated by the user, a receiving unit (not shown) that receives a video signal transmitted from a broadcasting station, and the like. May be. The display device 200 can connect the above-described constituent elements by, for example, a bus as a data transmission path. Here, examples of the display device storage unit (not shown) include a magnetic recording medium such as a hard disk and a nonvolatile memory such as a flash memory, but are not limited thereto. Examples of the display device operation unit include, but are not limited to, an operation input device such as a keyboard and a mouse, buttons, direction keys, or a combination thereof.

  The video signal correction unit 202 has, for example, the same configuration as the video signal processing apparatus 100 according to the embodiment of the present invention shown in FIG. Therefore, the video signal correction unit 202 calculates the average luminance for each divided region based on the input video signal, sets a correction value according to the display position of the display screen, and corrects the gain of the video signal. it can.

  The video display unit 204 can display a video based on the video signal corrected by the video signal correction unit 202.

[Configuration Example of Video Display Unit 204]
The video display unit 204 can include a display unit 206, a row driving unit 208, a column driving unit 210, a power supply unit 212, and a display control unit 214.

  The display unit 206 can include a plurality of pixels arranged in a matrix. For example, a display unit that displays an SD (Standard Definition) resolution image has at least 640 × 480 = 307200 (data lines × scanning lines) pixels, and these pixels are red (red) and green for color display. In the case of (Green) and blue (Blue) sub-pixels, the sub-pixel has 640 × 480 × 3 = 921600 (data line × scanning line × number of sub-pixels). Similarly, for example, a display unit that displays an HD (High Definition) resolution image has 1920 × 1080 pixels, and has 1920 × 1080 × 3 sub-pixels for color display.

  Further, the display unit 206 may include, for example, a pixel circuit (not shown) for controlling the amount of voltage / current applied to each pixel. The pixel circuit includes, for example, a switch element and a drive element for controlling the amount of current by an applied scanning signal and a voltage signal, and a capacitor for holding a voltage signal. The switch element and the drive element are composed of, for example, a thin film transistor.

  The row driver 208 and the column driver 210 can apply voltage signals to a plurality of pixels included in the display unit 206 to cause each pixel to emit light. Here, one of the row driving unit 208 and the column driving unit 210 applies a voltage signal (scanning signal) that determines ON / OFF of a pixel, and the other applies a voltage signal (video signal) corresponding to an image to be displayed. Play the role of applying.

  Further, as a driving method of the row driving unit 208 and the column driving unit 210, for example, a dot sequential driving scanning method in which light is emitted for each pixel arranged in the matrix, and the pixels arranged in the matrix are arranged for each column. Examples include a line sequential drive scanning method for emitting light, and a surface sequential drive scanning method for emitting light from all the pixels arranged in the matrix. Note that the video display unit 204 of the display device 200 illustrated in FIG. 10 includes two drive units, a row drive unit 208 and a column drive unit 210, but the display device according to the embodiment of the present invention has one drive. Needless to say, it can be composed of parts.

  The power supply unit 212 supplies power to the row driving unit 208 and the column driving unit 210, and a voltage is applied to the row driving unit 208 and the column driving unit 210. The magnitude of the voltage that the power supply unit 212 applies to the row driving unit 208 and the column driving unit 210 varies according to the video signal corrected by the video signal correction unit 202.

  The display control unit 214 is configured by, for example, an MPU and the like, and determines a pixel ON / OFF for one of the row driving unit 208 and the column driving unit 210 in accordance with the video signal corrected by the video signal correction unit 202. Can be input to the pixel, and a video signal can be input to the other. The display control unit 214 can also control the supply of power to the row driving unit 208 and the column driving unit 210 by the power supply unit 212 in accordance with the video signal corrected by the video signal correction unit 202.

  The display apparatus 200 according to the embodiment of the present invention has a configuration as shown in FIG. 10, thereby correcting an input video signal and displaying a video based on the corrected video signal.

  As described above, the display device 200 according to the embodiment of the present invention includes the video signal correction unit 202 and, like the video signal processing device according to the embodiment of the present invention, is divided into regions based on the input video signal. An average luminance for each of the divided areas is calculated, and a correction center position is set for the center point of the divided area having the highest average luminance based on the calculated average luminance for each divided area (in principle, processing). Further, the display device 200 sets a correction value for attenuating the gain of the video signal toward the screen edge of the display screen using the set correction center position as a base point. Then, the display device 200 corrects (attenuates) the gain of the video signal by multiplying the input video signal by a correction value corresponding to the set display position of the display screen. Therefore, the display device 200 sets the luminance of the divided region having the highest average luminance (that is, the region where there is a high possibility that important information exists) to the highest, and moves to the screen edge of the display screen from the correction center position as a base point. The gain of the video signal can be corrected so that the luminance decreases toward the front.

  The display device 200 includes a video display unit 204 and can display a video (or image) indicated by the video signal corrected by the video signal correction unit 202. Here, the video signal correction unit 202 can correct the video signal so that the gain is attenuated toward the end of the display screen (the display unit 206 of the video display unit 204) with the correction center position as a base point. Therefore, when the video (or image) indicated by the video signal corrected by the video signal correction unit 202 is displayed on the display screen, the display device 200 has a problem in the conventional display device as shown in FIG. Occurrence can be prevented.

  Therefore, the display device 200 can improve the image quality while suppressing power consumption when displayed on the display screen by controlling the luminance of the video signal based on the input video signal.

  In addition, the display device 200 appropriately changes the gain attenuation rate of the video signal according to the amount of deviation of the set correction center position from the predetermined reference position, similarly to the video signal processing device according to the embodiment of the present invention. can do. Therefore, the display device 200 can control the luminance of the video signal so as to achieve higher image quality.

  Furthermore, the display device 200 can change the correction value step by step in order to prevent deterioration in image quality due to a rapid change in luminance when displayed on the display screen. Therefore, the display device 200 can control the luminance of the video signal so as to achieve higher image quality.

  In the embodiment of the present invention, the display device 200 has been described. However, the embodiment of the present invention is not limited to the embodiment, and various self-luminous display devices such as a PDP, an OLED display, and an FED are used. Can be applied to. In addition, the embodiment of the present invention can be applied to a receiving apparatus that receives a television broadcast.

(Program related to display device 200)
By controlling the luminance of the video signal based on the input video signal by a program for causing the display device 200 according to the embodiment of the present invention to function as a computer, the power consumption is reduced when the display device 200 is displayed on the display screen. High image quality can be achieved.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the video signal processing apparatus 100 according to the embodiment of the present invention illustrated in FIG. 3 and the display apparatus 200 illustrated in FIG. 10, the input video signal is described as a digital signal. For example, the video signal processing device according to the embodiment of the present invention and the display device according to the embodiment of the present invention each include, for example, an A / D converter (Analog to Digital converter), and an input analog signal (video signal). May be converted into a digital signal, and the converted video signal may be processed. In addition, the video signal processing device according to the embodiment of the present invention and the display device according to the embodiment of the present invention may process an analog signal (video signal) by configuring each component with an analog circuit, for example. it can.

  The display device 200 according to the embodiment of the present invention shown in FIG. 10 includes the video signal correction unit 202 and the video display unit 204, but is not limited to this mode. The display control unit 214 included in the video display unit 204 may be integrated. Even in such a configuration, the display control unit can correct the input video signal and control the column driving unit, the row driving unit, the power supply unit, and the like based on the corrected video signal. The video can be displayed based on the corrected video signal as in the display device 200 according to the embodiment of the present invention.

  The configuration described above can be easily changed by those skilled in the art, and should be understood as belonging to the equivalent scope of the present invention.

It is explanatory drawing for demonstrating the problem in the conventional display apparatus. It is explanatory drawing for demonstrating the outline | summary of the process in the video signal processing apparatus which concerns on embodiment of this invention. It is a block diagram which shows an example of the video signal processing apparatus which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the 1st correction value setting method in the correction value setting part which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the 2nd correction value setting method in the correction value setting part which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the 3rd correction value setting method in the correction value setting part which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the problem which the 4th correction value setting method in the correction value setting part which concerns on embodiment of this invention makes object. It is explanatory drawing for demonstrating the 4th correction value setting method in the correction value setting part which concerns on embodiment of this invention. 3 is a flowchart illustrating an example of a video signal processing method according to an embodiment of the present invention. It is a block diagram which shows an example of the display apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Video signal processing apparatus 102 Average brightness calculation part 104 Correction center setting part 106 Correction value setting part 108 Gain adjustment part 200 Display apparatus 202 Video signal correction part 204 Video display part

Claims (9)

An average luminance calculating unit that divides a display screen into a plurality of divided regions and calculates an average luminance for each of the divided regions based on an input video signal;
A correction center setting unit that sets a correction center position based on the average luminance for each of the divided areas;
A correction value setting unit that sets a correction value according to the display position of the display screen, using the correction center position as a base point;
E Bei and a gain adjustment unit which adjusts the gain of the image signal based on the correction value,
When the correction center position changes abruptly with a transition of one frame, an intermediate correction center position is provided between the correction center position before the change and the correction center position after the change, and the intermediate correction center position for each frame. Sequentially to the correction center position,
A video signal processing apparatus. 2. The video according to claim 1, wherein the correction value setting unit sets a correction value that attenuates a gain of the video signal toward a screen end portion of the display screen with the correction center position as a base point. Signal processing device. 3. The video signal processing according to claim 2, wherein the correction value setting unit changes a gain attenuation rate of the video signal in accordance with a deviation amount of the correction center position with respect to a predetermined reference position. apparatus. The correction value setting unit, when the correction center position set by the correction center setting unit changes from the first correction center position to the second correction center position, the correction value corresponding to the first correction center position 4. The video signal processing device according to claim 1, wherein the correction value is changed stepwise from a correction value to a correction value corresponding to the second correction center position. 5. The video signal processing apparatus according to claim 1, wherein the correction center setting unit sets a center point of a divided area having a maximum average luminance for each divided area as the correction center position. 6. 2. The correction center setting unit, when there are a plurality of divided areas in which the average luminance for each of the divided areas is maximum, sets a preset preset position as the correction center position. 5. The video signal processing apparatus according to 4. Dividing the display screen into a plurality of divided areas and calculating an average luminance for each of the divided areas based on an input video signal;
Setting a correction center position based on the average luminance for each of the divided regions;
Setting a correction value according to the display position of the display screen, using the correction center position as a base point;
Adjusting the gain of the video signal based on the correction value;
When the correction center position changes abruptly with a transition of one frame, an intermediate correction center position is provided between the correction center position before the change and the correction center position after the change, and the intermediate correction center position for each frame. Step sequentially to the correction center position,
A video signal processing method comprising the steps of: Dividing the display screen into a plurality of divided areas and calculating an average luminance for each of the divided areas based on an input video signal;
Setting a correction center position based on the average luminance for each of the divided regions;
Setting a correction value according to the display position of the display screen, using the correction center position as a base point;
Adjusting the gain of the video signal based on the correction value;
When the correction center position changes abruptly with a transition of one frame, an intermediate correction center position is provided between the correction center position before the change and the correction center position after the change, and the intermediate correction center position for each frame. Step sequentially to the correction center position,
A program that causes a computer to execute. A self-luminous display device,
A video signal correction unit for correcting the input video signal;
A video display unit for displaying video on a display screen based on the video signal corrected by the video signal correction unit;
With
The video signal correction unit is
An average luminance calculating unit that divides the display screen into a plurality of divided regions and calculates an average luminance for each of the divided regions based on an input video signal;
A correction center setting unit for setting a correction center position based on the average luminance for each of the divided areas;
A correction value setting unit that sets a correction value according to the display position of the display screen, using the correction center position as a base point;
A gain adjusting unit that adjusts the gain of the video signal based on the correction value;
Bei to give a,
When the correction center position changes abruptly with a transition of one frame, an intermediate correction center position is provided between the correction center position before the change and the correction center position after the change, and the intermediate correction center position for each frame. Sequentially to the correction center position,
A display device characterized by that.

Images