JP6293320B1 - Brightness correction device, display device, information processing device, and brightness correction program - Google Patents

Abstract

An object of the present invention is to reduce the variation in luminance of one frame even when the amount of luminance deterioration differs between pixels. A luminance correction apparatus 20 includes a parameter acquisition unit 21 that acquires a parameter related to luminance deterioration of each pixel constituting a frame in a plurality of times for each part, and a plurality of pixels acquired by the parameter acquisition unit 21. The reference value calculation unit 22 that calculates the luminance deterioration reference value using the parameters related to the luminance deterioration of the pixel, the luminance deterioration reference value calculated by the reference value calculation unit 22, and the luminance deterioration of each pixel acquired by the parameter acquisition unit 21 And a luminance correction value calculation unit 23 that calculates a luminance correction value for equalizing the luminance of one frame for each pixel using the parameters relating to the above. [Selection] Figure 3

Description

  The present invention relates to a luminance correction device, a display device, an information processing device, and a luminance correction program.

  The flat panel display (FPD) has a light emission method such as a non-self-luminous type typified by a liquid crystal display (LED), a self-luminous type such as a plasma display panel (PDP) and an organic EL display (OELD). It can be roughly divided into light-emitting types. In a self-luminous FPD, a light emitting element constituting a pixel deteriorates as the light emission time elapses, so that even if the same energy (pixel value) is supplied, so-called luminance deterioration is caused in which the luminance decreases from the start of use.

  Existence of light-emitting elements that deteriorated by the human eye when the pixel values that display the same color are set in the pixels when the luminance degradation of the light-emitting elements that make up a pixel deteriorates more than the light-emitting elements that make up surrounding pixels A so-called burn-in phenomenon occurs. For example, when displaying a color display icon as a still image for a long time on a gray desktop screen, if the same gray as the desktop screen is displayed in the area where the icon is displayed, then the pixel that displayed the icon is displayed. There is a difference in brightness due to image sticking between the gray to be displayed and the pixels that originally displayed the desktop screen.

  The image sticking occurs due to a difference in progress of deterioration between the light emitting elements. Since gray drives each light emitting element of red, green, and blue with the same pixel value, three light emitting elements in one pixel deteriorate equally. Therefore, if the entire background image such as a desktop screen is displayed in gray so that the luminance of the light emitting elements is uniform, the image sticking problem hardly occurs. However, since the pixels are actually driven with random pixel values according to the image displayed, a difference occurs in luminance degradation. In particular, a pixel or the like in which a fixed color is displayed at a fixed location such as an icon progresses in luminance deterioration faster than other pixels, and the luminance for the same pixel value is lower than other pixels.

  As an invention for suppressing such a local luminance difference, for example, Patent Document 1 discloses a luminance degradation amount of a light emitting element that displays a fixed pattern by devising a light emitting pattern of the light emitting element that displays the fixed pattern. And a technique for making the luminance deterioration amount of the light emitting element displaying the background image equal.

JP 2011-17746 A

In the method disclosed in Patent Document 1 described above, by devising an issuance pattern of a light emitting element that displays a fixed pattern, the luminance deterioration amount between pixels is made substantially uniform and burn-in is suppressed. There is a disadvantage that restrictions occur.
In addition, since the organic EL element does not recover once it deteriorates, even if a screen saver composed of a moving image is displayed, the image sticking that occurs as a difference in luminance deterioration cannot be improved.

  The present invention has been made in view of such circumstances, and even when the amount of deterioration in luminance differs between pixels, a luminance correction device, a display device, and information that can reduce variations in luminance of one frame. It is an object to provide a processing device and a brightness correction program.

According to a first aspect of the present invention, there is provided a parameter acquisition unit that acquires a parameter related to luminance degradation of each pixel constituting a frame in a plurality of times for each portion, and the luminance of the plurality of pixels acquired by the parameter acquisition unit Reference value calculation means for calculating a luminance deterioration reference value using parameters relating to deterioration, the luminance deterioration reference value calculated by the reference value calculation means, and the luminance deterioration of each pixel acquired by the parameter acquisition means by using the parameters, and the luminance correction value calculating means for calculating a luminance correction value for equalizing the luminance of the one frame for each pixel, based on the luminance correction value calculated by the luminance correction value calculating means Pixel specifying means for specifying a pixel whose luminance deterioration is a predetermined value or more, and the pixel specified by the pixel specifying means The update frequency of the degree correction value is a luminance correction unit to be higher than the update frequency of the luminance correction value of the other pixel.

According to the brightness correction apparatus, the brightness deterioration reference value is calculated by the reference value calculation means using the plurality of parameters relating to the brightness deterioration acquired by the parameter acquisition means, and acquired by the brightness deterioration reference value and the parameter acquisition means. The brightness correction value for each pixel is calculated by comparing the plurality of parameters relating to the brightness deterioration. As a result, a luminance correction value that brings the luminance of each pixel close to the luminance deterioration reference value can be calculated, and variations in luminance of one frame can be reduced.
In the brightness correction apparatus, when one pixel is composed of a plurality of sub-pixels corresponding to a plurality of colors, the “pixel” includes a case where it means “a sub-pixel related to at least one color”. . For example, when one pixel is composed of three sub-pixels corresponding to RGB, the “pixel” may mean at least a “sub-pixel” of the same color (for example, R). .

  A second aspect of the present invention is a display device including the brightness correction device.

  A 3rd aspect of this invention is an information processing apparatus provided with the said display apparatus.

According to a fourth aspect of the present invention, there is provided a step of acquiring a parameter relating to luminance deterioration of each pixel constituting one frame in a plurality of times, and acquiring the luminance deterioration using the acquired parameter relating to luminance deterioration of each pixel. A step of calculating a reference value; a step of calculating a luminance correction value for equalizing the luminance of the one frame for each pixel using the luminance deterioration reference value and the parameter relating to the luminance deterioration of each pixel; Identifying a pixel whose luminance degradation is equal to or greater than a predetermined value based on the luminance correction value, and setting an update frequency of the luminance correction value of the specified pixel higher than an update frequency of the luminance correction value of another pixel. This is a luminance correction method.

According to a fifth aspect of the present invention, luminance degradation is performed using a process for acquiring a parameter relating to luminance degradation of each pixel constituting a frame in a plurality of times and acquiring the parameter relating to luminance degradation of each pixel obtained. A process of calculating a reference value; a process of calculating a luminance correction value for equalizing the luminance of the one frame for each pixel using the luminance deterioration reference value and the parameter relating to the luminance deterioration of each pixel ; A process of identifying a pixel whose luminance degradation is equal to or greater than a predetermined value based on the luminance correction value, and making an update frequency of the luminance correction value of the specified pixel higher than an update frequency of the luminance correction value of other pixels. This is a luminance correction program for causing a computer to execute.

  According to the present invention, it is possible to reduce variation in luminance of one frame even when the luminance deterioration amount differs between pixels.

It is the figure which showed schematic structure of the information processing apparatus which concerns on 1st Embodiment of this invention. It is the figure which showed the hardware constitutions of the information processing apparatus which concerns on 1st Embodiment of this invention. It is a functional block diagram of the brightness correction unit according to the first embodiment of the present invention. It is a functional block diagram of the brightness correction unit according to the second embodiment of the present invention. It is the flowchart shown about the procedure of the brightness correction process implement | achieved by the brightness correction part which concerns on 2nd Embodiment of this invention.

[First Embodiment]
Hereinafter, a luminance correction device, a display device, an information processing device, and a luminance correction program according to a first embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the case where the brightness correction apparatus of the present invention is applied to an information processing apparatus will be described. However, the present invention is not limited to this example. The present invention can be widely applied to display devices in which the luminance of the entire screen varies and electronic devices including such display devices. As an example of an electronic device, a car navigation system, ATM (Automatic Teller Machine), etc. other than the various information processing apparatus illustrated below are mentioned. Hereinafter, a notebook PC will be described as an example of the information processing apparatus. However, the present invention is not limited to this and may be a tablet terminal, a hybrid PC, or the like.

  FIG. 1 is a diagram illustrating a schematic configuration of a notebook PC according to the present embodiment, and FIG. 2 is a diagram illustrating a schematic configuration of hardware of the notebook PC 1 according to the present embodiment.

  As shown in FIG. 1 and FIG. 2, the notebook PC 1 includes, for example, a display device 10, an input device 11, a CPU (Central Processing Unit) 12, a ROM (Read Only Memory) 13, a memory 14, a flash memory 16, and a communication device. 17 etc. These units are directly or indirectly connected via the bus 18.

The display device 10 includes, for example, a display unit 31 and a display control unit 32 that controls image data to be displayed on the display unit 31.
The display unit 31 includes, for example, a plurality of pixels in which organic EL elements that are self-luminous light emitting elements are arranged in a matrix. In the present embodiment, an organic EL element will be described as an example of a self-luminous light emitting element. However, instead of this, a PDP (Plasma Display Panel), FED (Field Emission Display), or inorganic LED (Inorganic LED) is used. A self-luminous light emitting element such as the above may be used.
One pixel is composed of three sub-pixels composed of RGB organic EL elements. Note that the present invention is not limited to this example. For example, one pixel may be composed of three organic EL elements corresponding to W and three sub-pixels composed of color filters corresponding to RGB. You may be comprised by two SOLED (Transparent Stacked OLED).

  Each pixel includes an organic EL element that functions as a light emitting layer, a switching element (TFT) that controls pixel selection and supply current to the organic EL element, and a capacitor that stores RGB data signals. The organic EL element emits light with the driving current supplied from the signal line driving circuit. The magnitude of the drive current is controlled by the display control unit 32 in accordance with, for example, an RGB data signal supplied from the CPU 12 described later.

  The input device 11 is a user interface for a user to perform an input operation, and examples thereof include a keyboard, a touch pad, a mouse, and a track point. The input device 11 may be a software keyboard.

The CPU 12 controls the notebook PC 1 as a whole, for example, by an OS (Operating System) stored in the flash memory 16, and performs brightness correction processing, which will be described later, and an input device based on various programs stored in the flash memory 16. 11 or the like in accordance with the user's operation via 11.
The ROM 13 stores a basic input / output system (BIOS) and various data.
The memory 14 is a writable memory used as a work area for reading an execution program of the CPU 12 and writing processing data by the execution program, and examples thereof include a cache memory and a RAM (Random Access Memory).

The flash memory 16 has a function of storing an OS for controlling the entire notebook PC 1, various drivers for operating hardware of peripheral devices, applications directed to specific tasks, various data and files, and the like. Note that the notebook PC 1 may include other storage means such as an HDD (Hard Disk Drive) as storage means in place of the flash memory.
The communication device 17 performs communication with other devices.

Next, a brightness correction function among various functions provided in the notebook PC 1 will be described with reference to FIG. The luminance correction function is a function that corrects variations in luminance due to luminance degradation of the organic EL elements constituting the display unit 31 and makes the luminance of the entire screen of the display unit 31 uniform.
FIG. 3 is a functional block diagram illustrating an outline of the luminance correction unit (luminance correction device) according to the present embodiment. The processing realized by each unit shown in FIG. 3 is realized, for example, by the CPU 12 reading out the luminance correction program stored in the flash memory 16 to the memory 14 and executing it.

As shown in FIG. 3, the luminance correction unit 20 mainly includes a parameter acquisition unit 21, a reference value calculation unit 22, a luminance correction value calculation unit 23, a parameter storage unit 24, a reference value storage unit 25, and a luminance correction value storage unit 26. It is prepared as a simple configuration.
The parameter acquisition unit 21 acquires a parameter relating to luminance deterioration of each pixel constituting one frame of the display unit 31 (hereinafter referred to as “luminance deterioration parameter”) for each portion in a plurality of times. That is, the parameter acquisition unit 21 does not acquire the luminance deterioration parameter for all the pixels constituting one frame at a time, but acquires it for each part at different timings divided into a plurality of times.
Here, as described above, one pixel is composed of a plurality of sub-pixels. The parameter acquisition unit 21 may acquire the luminance degradation parameter of each sub-pixel constituting one pixel, and if a representative color is set, the sub-pixel related to the representative color is represented as a representative of each pixel. A luminance deterioration parameter may be acquired as a pixel.
Hereinafter, for convenience of explanation, “pixel” will be described by exemplifying a sub-pixel of any one color (for example, R) among a plurality of sub-pixels constituting one pixel. When performing luminance deterioration correction for each of a plurality of sub-pixels constituting one pixel, each unit described later may perform the same processing for each sub-pixel for each color.

Examples of the luminance deterioration parameter include a voltage threshold value when a switching element (for example, TFT) that drives each organic EL element is turned on.
Here, the luminance deterioration parameter cannot be acquired in a state where an image is displayed on the display screen. Therefore, the user cannot use the notebook PC 1 during the period in which the luminance deterioration parameter is acquired for each pixel. For this reason, for example, if it is attempted to acquire the luminance deterioration parameters of all the pixels constituting one frame at a time, the time during which the notebook PC 1 cannot be used is prolonged, which may give the user frustration and discomfort. Therefore, in this embodiment, the luminance deterioration parameter for one frame is acquired in a plurality of times, and the time required for acquiring the parameter once is shortened. As a result, the acquisition of the luminance deterioration parameter can be completed in a short time that the user cannot perceive.

  The parameter acquisition unit 21 may acquire the luminance deterioration parameter when the notebook PC 1 is in at least one of a sleep state and a hibernation state, for example. In this case, for example, when the transition from the sleep state or the hibernation state to the operation state is performed, the position information of the last pixel for which the luminance deterioration parameter has been acquired is stored. The acquisition of the luminance deterioration parameter may be started from the pixel next to the stored pixel.

Moreover, the parameter acquisition part 21 is good also as acquiring a brightness degradation parameter in the preset parameter acquisition time at the time decided every day. In this case, the luminance degradation parameters for the number of pixels that can be acquired within the parameter acquisition time are acquired. The number of pixels that can be acquired can be easily calculated from the time required to acquire the luminance deterioration parameter of one pixel and the parameter acquisition time. Further, the number of lines may be used instead of the number of pixels. In this case, the number of lines is calculated from the time required to acquire the luminance deterioration parameter for one line and the parameter acquisition time.
The parameter acquisition time may be configured to be set by the user from the input device 11, for example. Thereby, the time which each user can accept | permit for parameter acquisition with an own scale can be set. As a result, it is possible to efficiently acquire parameters without causing discomfort to the user. Further, the timing for acquiring the luminance degradation parameter is not limited to the above, and may be performed several times a day or once every several days, for example.
However, it is necessary to set the period required to acquire the luminance degradation parameter for one frame to be shorter than the period in which the luminance degradation of the organic EL element appears remarkably. For example, it is necessary to be able to acquire a luminance deterioration parameter for one frame within three months.
The parameter storage unit 24 stores the luminance deterioration parameter of each pixel acquired by the parameter acquisition unit 21 in association with each pixel.

For example, when the luminance degradation parameter for one frame is accumulated in the parameter storage unit 24, the reference value calculation unit 22 uses all the luminance degradation parameters accumulated in the parameter storage unit 24 to use the luminance degradation reference value ( Hereinafter, it is referred to as “reference value”).
This reference value is a reference value used for calculating a luminance correction value for making the luminance of one frame uniform. The reference value may be, for example, the average value of the luminance deterioration parameters for one frame, or may be the highest or lowest luminance deterioration parameter among the luminance deterioration parameters for one frame. Further, an optimal value may be calculated using a statistical method, and the calculated optimal value may be used as a reference value.
The reference value storage unit 25 stores the reference value calculated by the reference value calculation unit 22.

The luminance correction value calculation unit 23 compares the reference value stored in the reference value storage unit 25 with the luminance deterioration parameter of each pixel stored in the parameter storage unit 24, and calculates a luminance correction value for each pixel. . For example, the luminance correction value calculation unit 23 estimates that the luminance of the pixel whose luminance has deteriorated more than the reference value has decreased due to the deterioration. Set the correction value. In addition, the luminance correction value calculation unit 23 controls the pixel in which the luminance deterioration is delayed from the reference value, because the luminance is higher than the pixel in which the deterioration is advanced, so that the luminance is decreased. Set the brightness correction value for this.
The brightness correction value is, for example, a current correction value for correcting the drive current supplied to each pixel according to the pixel value.
The luminance correction value storage unit 26 stores a luminance correction table in which the luminance correction value calculated by the luminance correction value calculation unit 23 is associated with each pixel.

  When performing display on the display unit 31 of the display device 10, the display control unit 32 refers to the luminance correction table stored in the luminance correction value storage unit 26 and determines according to the pixel value of each pixel supplied from the CPU 12. The drive current to be corrected is corrected. Specifically, the display control unit 32 increases the drive current determined corresponding to the pixel value in accordance with the magnitude of the luminance correction value for the pixel for which the luminance correction value is set to a positive value. Correction is performed, and for pixels for which the luminance correction value is set to negative, correction is performed to reduce the drive current determined corresponding to the pixel value in accordance with the magnitude of the luminance correction value. Thereby, the luminance of each pixel can be brought close to the reference value, and the luminance can be made uniform by suppressing the luminance variation.

Next, luminance correction processing realized by the luminance correction unit 20 according to this embodiment described above will be described.
First, the parameter acquisition unit 21 acquires the luminance deterioration parameter of each pixel constituting one frame of the display unit 31 in a plurality of times, and acquires the acquired luminance deterioration parameter in association with each pixel. 24.

  In this way, when the luminance correction parameter is acquired by the parameter acquisition unit 21 a plurality of times, and the luminance deterioration parameter for one frame is accumulated in the parameter storage unit 24, the reference value calculation unit 22 accumulates the luminance deterioration parameter. A reference value is calculated using the luminance degradation parameter for one frame and stored in the reference value storage unit 25.

  When the reference value storage unit 25 is updated, the luminance correction value calculation unit 23 compares the updated reference value with the luminance deterioration parameter of each pixel stored in the parameter storage unit 24 to thereby calculate each pixel. A brightness correction value is calculated. The brightness correction value calculated by the reference value calculation unit 22 is associated with each pixel and stored in the brightness correction value storage unit 26. As a result, a new brightness correction table is created in the brightness correction value storage unit 26.

  The display control unit 32 of the display device 10 determines a drive current for each pixel based on RCB image data supplied from the CPU 12, and uses the determined drive current as a luminance correction value stored in the luminance correction value storage unit 26. Each pixel is driven with the corrected drive current.

As described above, according to the luminance correction device, the display device, the information processing device, and the luminance correction program according to the present embodiment, the luminance deterioration parameter for one frame is not acquired at a time, but a plurality of times. Since it is acquired separately for each part, it is possible to shorten the time required to acquire one luminance deterioration parameter. Thereby, it is possible to end the acquisition of the luminance deterioration parameter every time within a time that the user can accept or within a time that the user does not perceive. As a result, the inconvenience that the user wants to use the notebook PC 1 but cannot use it can be solved.
Furthermore, according to the present embodiment, a reference value is calculated by the reference value calculation unit 22 using the luminance degradation parameter for one frame acquired by the parameter acquisition unit 21 and stored in the reference value and parameter storage unit 24. By comparing the luminance deterioration parameter for each pixel for one frame, the luminance correction value for each pixel is calculated. Thereby, since the brightness of each pixel is controlled so that the brightness of each pixel approaches the reference value, it is possible to reduce the variation in brightness of the entire display screen of the display unit 31.

[Second Embodiment]
Next, a brightness correction device, a display device, an information processing device, and a brightness correction program according to a second embodiment of the present invention will be described with reference to the drawings.
In the above-described embodiment, the reference value and the luminance correction value are calculated after the luminance deterioration parameter for one frame is acquired. However, in the present embodiment, every time the luminance deterioration parameter is acquired by the parameter acquisition unit 21. The difference is that the reference correction value and the luminance correction value are calculated.
Hereinafter, description of points common to the first embodiment described above will be omitted, and different points will be mainly described.

  FIG. 4 is a functional block diagram showing a schematic function of the luminance correction unit 20 ′ according to the present embodiment. As shown in FIG. 4, the luminance correction unit 20 ′ according to the present embodiment includes a parameter acquisition unit 21, a reference value calculation unit 22 ′, a luminance correction value calculation unit 23 ′, a parameter storage unit 24 ′, and a provisional reference value storage unit. 25a, a definite reference value storage unit 25b, and a luminance correction value storage unit 26 ′.

  In such a luminance correction unit 20 ′, the reference value calculation unit 22 ′ calculates the reference value when the luminance deterioration parameter is acquired by the parameter acquisition unit 21 and the luminance deterioration parameter is stored in the parameter storage unit 24 ′. The calculated reference value is stored as a temporary reference value in the temporary reference value storage unit 25a. As described above, the provisional reference value is a value that is updated as needed until the luminance deterioration parameters for all the pixels constituting one frame are acquired.

  When the parameter acquisition unit 21 acquires the luminance degradation parameter for all pixels in one frame, the provisional reference value using the luminance degradation parameter for one frame is calculated by the reference value calculation unit 22. The temporary reference value is stored as a fixed reference value in the fixed reference value storage unit 25b, and the temporary reference value stored in the temporary reference value storage unit 25a is reset (erased).

On the other hand, when the luminance deterioration parameter is acquired by the parameter acquisition unit 21, the luminance correction value calculation unit 23 ′ compares the acquired luminance deterioration parameter with the fixed reference value stored in the fixed reference value storage unit 25b. Thus, the brightness correction value of each pixel is calculated. Here, the definite reference value is a reference value calculated using the luminance deterioration parameter for all pixels in one frame in the previous luminance correction process.
The luminance correction value storage unit 26 ′ stores a luminance correction table in which each pixel is associated with the luminance correction value. When a new luminance correction value is calculated by the luminance correction value calculation unit 23 ′, The luminance correction value corresponding to the pixel is updated.

  Next, luminance correction processing realized by the luminance correction unit 20 'according to the present embodiment will be described with reference to FIG. In the following description, for convenience of explanation, a case where one frame is composed of 1080 lines and luminance deterioration parameters for 30 lines are acquired by one parameter acquisition will be described as an example.

First, when the luminance correction process is started, the parameter acquisition unit 21 performs the first parameter acquisition process (step SA1). Thereby, the luminance degradation parameters of 1 to 30 lines are acquired, and the luminance degradation parameters of 1 to 30 lines are stored in the parameter storage unit 24 ′ (Step SA2).
Next, the reference value calculation unit 22 ′ performs a reference value calculation process using the luminance degradation parameters of 1 to 30 lines stored in the parameter storage unit 24 ′ (step SA3), and the calculated reference value is The provisional reference value is stored in the provisional reference value storage unit 25a (step SA4).

On the other hand, a luminance correction value calculation process is performed by the luminance correction value calculation unit 23 ′ (step SA5). Thereby, the luminance degradation parameters of 1 to 30 lines stored in the parameter storage unit 24 ′ are compared with the determined reference values stored in the determined reference value storage unit 25b, and each pixel is associated with 1 to 30 lines. The brightness correction value to be calculated is calculated. Here, the final reference value that is currently referred to is a reference value that is calculated using the luminance degradation parameter for one frame acquired in the previous luminance correction process.
When a new luminance correction value is calculated by the luminance correction value calculation unit 23 ′, the calculated luminance correction value is written in the luminance correction table of the luminance correction value storage unit 26, and the luminance correction table is updated (step SA6). ). Thereby, the brightness correction value storage unit 26 describes the brightness correction value calculated in the current brightness correction process for each pixel of 1 to 30 lines, and the previous brightness for each pixel of 31 to 1080 lines. The brightness correction table in which the brightness correction value acquired in the correction process is described is stored.

Next, it is determined whether or not the luminance deterioration parameter has been acquired for all the pixels in one frame (step SA7). As a result, since it is “NO” at the present time, the process returns to step SA1 and the parameter acquisition unit 21 performs the second parameter acquisition process. As a result, the 31 to 60 line luminance deterioration parameters are acquired by the parameter acquisition unit 21, and the 31 to 60 line luminance deterioration parameters are overwritten in the parameter storage unit 24 ′ (step SA2).
The reference value calculation unit 22 calculates a reference value using the provisional reference value stored in the provisional reference value storage unit 25a and the luminance degradation parameters of 31 to 60 lines stored in the parameter storage unit 24 (step SA3), which is stored in the temporary reference value storage unit 25a as a temporary reference value. Thereby, the temporary reference value stored in the temporary reference value storage unit 25a is updated (step SA4).

In addition, the luminance correction value calculation unit 23 compares the 31 to 60 line luminance deterioration parameters stored in the parameter storage unit 24 ′ with the fixed reference value stored in the fixed reference value storage unit 25b. A luminance correction value corresponding to each pixel is calculated for lines 31 to 60 (step SA5), and the luminance correction table stored in the luminance correction value storage unit 26 is updated (step SA6).
Thereby, the luminance correction value storage unit 26 describes the luminance correction value calculated in the current acquisition scan for each pixel of 1 to 60 lines, and the previous acquisition scan for each pixel of 61 to 1080 lines. The brightness correction table in which the brightness correction values acquired in step 1 are described is stored.

  Then, the same processing is repeated, and when the luminance deterioration parameters of the 1051-1080 lines are acquired in step SA1, the acquired luminance deterioration parameters are overwritten in the parameter storage unit 24 '(step SA2). Subsequently, a reference value is calculated using the temporary reference value stored in the temporary reference value storage unit 25a and the luminance deterioration parameters of the 1051-1080 lines stored in the parameter storage unit 24 (step SA3). The reference value is stored as a temporary reference value in the temporary reference value storage unit 25a (step SA4).

Further, by comparing the luminance degradation parameters of 1051 to 1080 lines stored in the parameter storage unit 24 ′ with the fixed reference values stored in the fixed reference value storage unit 25b, each pixel for the 1051 to 1080 lines is compared. The corresponding brightness correction value is calculated (step SA5), and the brightness correction table stored in the brightness correction value storage unit 26 is updated (step SA6).
As a result, the luminance correction value storage unit 26 stores a luminance correction table in which the luminance correction values acquired in the current luminance correction processing are described for each pixel of all lines.

Subsequently, it is determined as “YES” in Step SA7, and in Step SA8, the provisional reference value stored in the provisional reference value storage unit 25a is read out and stored in the confirmation reference value storage unit 25b as a confirmation reference value. By resetting the provisional reference value storage unit 25a, the provisional reference value is set to zero (step SA9), and the luminance correction process is terminated.
Thereby, in the next brightness correction process, the brightness correction value is calculated using the newly determined reference value this time.

As described above, according to the brightness correction device, the display device, the information processing apparatus, and the brightness correction program according to the present embodiment, when the brightness deterioration parameter is acquired by the parameter acquisition unit 21, the acquired brightness deterioration parameter is acquired. Since the provisional reference value and the brightness correction value are calculated as needed, for example, the number of data of the brightness deterioration parameter stored in the parameter storage unit 24 ′ can be reduced. As a result, the capacity of the parameter storage unit 24 ′ can be reduced, and downsizing and cost reduction can be achieved.
In the present embodiment, the luminance deterioration parameter acquired by one parameter acquisition process by the parameter acquisition unit 21 is stored in the parameter storage unit 24 ′, and the luminance deterioration parameter acquired by one parameter acquisition process is stored. However, the present invention is not limited to this example. For example, every time the parameter deterioration unit 21 acquires a luminance deterioration parameter for one pixel, the provisional reference value and the luminance correction value are calculated. The calculation of the brightness correction value may be performed as needed. Thus, by calculating the provisional reference value and the luminance correction value for each pixel, the data capacity of the parameter storage unit 24 ′ can be significantly reduced.

  As mentioned above, although each embodiment which concerns on the brightness | luminance correction apparatus of this invention, a display apparatus, information processing apparatus, and a brightness correction program has been demonstrated with reference to drawings, the technical scope of this invention is the range as described in the said embodiment. It is not limited to. Various changes or improvements can be added to the above-described embodiment without departing from the gist of the invention, and embodiments to which the changes or improvements are added are also included in the technical scope of the present invention. Moreover, you may combine the said embodiment suitably.

For example, the luminance correction units 20 and 20 ′ according to the above-described embodiments further include a pixel specifying unit that specifies pixels whose luminance deterioration is equal to or higher than a predetermined value based on the luminance correction value calculated by the luminance correction value calculation unit 23. It is good also as making the update frequency of the brightness correction value of the pixel specified by the pixel specification part higher than the update frequency of the brightness correction value of other pixels.
For example, in an area where the same image is displayed at the same position for a long time, such as when an icon is displayed, the luminance deterioration of the light emitting element progresses faster than the pixels in other areas. Therefore, it is possible to adjust the brightness with high accuracy by setting the brightness correction value calculation cycle to be shorter than other pixels for pixels with relatively fast progress of brightness degradation. It is possible to further suppress the variation of the above.

  Further, in each of the above-described embodiments, the case where the luminance correction function is realized using the hardware resources provided in the notebook PC 1 has been described as an example. However, the luminance correction apparatus is mounted in the notebook PC 1 as an independent circuit configuration. Also good. In this case, the brightness correction apparatus includes a unique CPU, memory, and the like, and realizes each brightness correction process described above. In this case, the CPU in the brightness correction apparatus appropriately communicates with the CPU 12 of the notebook PC 1 to realize the brightness correction process described above.

1: Notebook PC
10: Display device 11: Input device 12: CPU
13: ROM
14: Memory 16: Flash memory 17: Communication device 18: Buses 20, 20 ′: Luminance correction unit 21: Parameter acquisition units 22, 22 ′: Reference value calculation units 23, 23 ′: Luminance correction value calculation units 24, 24 ′ : Parameter storage unit 25: Reference value storage unit 25a: Temporary reference value storage unit 25b: Final reference value storage units 26 and 26 ': Brightness correction value storage unit 31: Display unit 32: Display control unit

Claims (10)

Parameter acquisition means for acquiring a parameter relating to luminance degradation of each pixel constituting one frame in a plurality of times for each part;
A reference value calculating unit that calculates a luminance deterioration reference value using a parameter related to the luminance deterioration of the plurality of pixels acquired by the parameter acquiring unit;
A luminance correction value for uniformizing the luminance of the one frame using the luminance deterioration reference value calculated by the reference value calculating unit and the parameter regarding the luminance deterioration of each pixel acquired by the parameter acquiring unit. Brightness correction value calculating means for calculating for each pixel ;
Pixel specifying means for specifying pixels whose luminance deterioration is equal to or greater than a predetermined value based on the luminance correction value calculated by the luminance correction value calculating means;
With
A brightness correction apparatus that sets the update frequency of the brightness correction value of a pixel specified by the pixel specifying means higher than the update frequency of the brightness correction value of another pixel .   The luminance correction apparatus according to claim 1, wherein the parameter acquisition unit acquires a parameter related to the luminance degradation of the number of pixels or the number of lines that can be acquired within a preset parameter acquisition time every time.   The brightness correction apparatus according to claim 2, wherein the parameter acquisition time can be set and changed by a user.   The brightness correction apparatus according to claim 1, wherein the parameter acquisition unit acquires a parameter relating to the brightness deterioration when the parameter acquisition unit is in at least one of a sleep state and a sleep state. Parameter storage means for storing parameters relating to the luminance of each pixel acquired by the parameter acquisition means;
The reference value calculating means stores the luminance deterioration reference value using the parameters relating to the luminance deterioration for all the pixels after the parameters relating to the luminance deterioration for all the pixels constituting the one frame are accumulated in the parameter storage means. The brightness correction apparatus according to claim 1, which calculates Provisional reference value storage means for storing, as a provisional reference value, the luminance deterioration reference value calculated using the parameter relating to the luminance deterioration partially acquired by the parameter acquisition means;
A deterministic reference value storage means for storing the luminance deterioration reference value calculated using the parameters relating to the luminance deterioration of all the pixels of the one frame acquired by the parameter acquisition means as a definite reference value;
Brightness correction value storage means for storing the brightness correction value for each pixel calculated by the brightness correction value calculation means,
The reference value calculation means, when the parameter acquisition means acquires the parameter relating to the luminance deterioration, the acquired parameter relating to the luminance deterioration and the provisional reference value stored in the temporary reference value storage means. Using the calculated brightness deterioration reference value, updating the provisional reference value storage means with the calculated brightness deterioration reference value as the provisional reference value,
The luminance correction value calculating means, when the parameter relating to the luminance degradation is obtained by the parameter obtaining means, and the obtained parameter relating to the luminance degradation and the determined reference value stored in the determined reference value storage means The brightness correction apparatus according to claim 1, wherein the brightness correction value is calculated by using and the brightness correction value stored in the brightness correction value storage unit is updated. A display apparatus provided with the brightness correction apparatus in any one of Claims 1-6 . A display device according to claim 7,
An information processing apparatus that corrects a drive current supplied to each pixel using the brightness correction value calculated by the brightness correction value calculation unit. A step of acquiring a parameter relating to luminance degradation of each pixel constituting one frame by dividing into a plurality of times, and
A step of calculating a luminance degradation reference value using the acquired parameter regarding luminance degradation of each pixel;
Calculating a luminance correction value for equalizing the luminance of the one frame for each pixel using the luminance degradation reference value and a parameter relating to the luminance degradation of each pixel;
Identifying a pixel whose luminance degradation is equal to or greater than a predetermined value based on the luminance correction value, and making the frequency of updating the luminance correction value of the identified pixel higher than the frequency of updating the luminance correction value of other pixels; A luminance correction method comprising: A process of acquiring a parameter relating to luminance deterioration of each pixel constituting one frame in a plurality of times and acquiring each part,
A process of calculating a luminance degradation reference value using the acquired parameter regarding luminance degradation of each pixel;
Processing for calculating a luminance correction value for equalizing the luminance of the one frame for each pixel using the luminance deterioration reference value and the parameter relating to the luminance deterioration of each pixel ;
A process for identifying a pixel whose luminance degradation is equal to or higher than a predetermined value based on the luminance correction value, and making the update frequency of the luminance correction value of the specified pixel higher than the update frequency of the luminance correction value of other pixels; A brightness correction program for causing a computer to execute.

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