JPWO2011121630A1 - Correction method and display device - Google Patents

Abstract

In the correction method for the display device, the control unit receives the black unevenness information in which the brightness information and the position information of the full screen black display displayed on the display unit are received and stored in the storage unit. Further, according to the luminance information of the image to be displayed, the control unit generates correction information for increasing the transmittance at the position where the luminance is determined to be low based on the black unevenness information stored in the storage unit, and the video signal Correction to increase the transmittance of the display unit by supplying to the processing unit is performed (liquid crystal transmittance waveform 22). Further, according to the luminance information of the image to be displayed, the control unit performs correction to reduce the light emission amount of the light source unit based on the correction information (backlight luminance waveform 73).

Description

  The present invention relates to a correction method for correcting display unevenness and a display device.

  An LCD (Liquid Crystal Display) monitor, which is a display device, controls the transmission amount of a liquid crystal panel according to an image to be displayed, and displays an image by modulating the amount of light emitted from a backlight unit provided on the back side . In such an LCD monitor, display unevenness in which display brightness and color are partially uneven may occur due to various factors. In addition, the display unevenness is different in the cause and the place where the high luminance display and the low luminance display are generated. In the case of high luminance display, the signal level supplied to the liquid crystal panel is high and the transmittance is high, so the influence of variation in transmittance characteristics is large. For this reason, when high luminance display is performed, the luminance around the liquid crystal panel tends to decrease.

  However, in the case of low luminance display, since the signal level supplied to the liquid crystal panel is low and the transmittance is low, the influence of factors different from the variation in transmittance characteristics is large. The liquid crystal panel has the lowest transmittance with respect to light when black is displayed on the entire screen. However, the transmittance is not uniform due to factors such as light leakage around the liquid crystal panel and changes in the liquid crystal due to pressure applied to the liquid crystal panel peripheral part, and a bright part occurs partially. This partially bright part is called black unevenness. This black unevenness is likely to occur in the peripheral portion of the display screen. A technique for correcting and improving the black unevenness is disclosed (see Patent Document 1 or Patent Document 2).

JP-A-10-84551 JP 2009-128733 A

However, in the correction method and display device disclosed in Patent Document 1, the transmittance of the liquid crystal is changed by correcting the signal level supplied to the liquid crystal panel, thereby improving the black unevenness. However, since the luminance width that can be used for image display becomes narrow, there is a problem that the contrast is lowered. Also. In the correction method and the display device disclosed in Patent Document 2, by correcting the signal level supplied to the liquid crystal panel and controlling the brightness of the backlight unit, correction corresponding to black unevenness is possible to some extent while maintaining contrast. It is. However, this correction method and display device require complicated control for controlling the brightness of the backlight for each display area. Further, since the signal level is corrected based on the measured value measured in the case of high luminance display, it cannot sufficiently cope with black unevenness.
As described above, the correction method and the display device disclosed in Patent Document 1 or Patent Document 2 have a problem that black unevenness cannot be improved while maintaining contrast.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a correction method and a display device that improve black unevenness while maintaining contrast.

  In order to solve the above problems, the present invention provides a display unit that modulates the light transmittance based on a display signal to display an image, a light source unit that irradiates the display unit with the light, and a supplied video A display device that generates the display signal based on information and includes a video signal processing unit that corrects the display signal based on correction information, and displays a full-screen black image on the display unit; A black unevenness detecting process for detecting black unevenness information including brightness information for each display position detected for each display position as a display state of the full-screen black image displayed on the display, and position information indicating the display position; The correction information for causing the correction to increase the transmittance at a position where the luminance is determined to be low based on the brightness information of the black unevenness information is generated according to the luminance information of the image to be displayed. , The video A correction method including a transmittance correction process for supplying the correction information to the signal processing unit, and a light source correction process for reducing the light emission amount of the light source unit based on the correction information according to the luminance information of the image to be displayed. is there.

  According to the present invention, the correction method in the display device displays the full-screen black image on the display unit, and displays the full-screen black image displayed on the display unit for each display position detected for each display position. Black unevenness information including brightness information and position information indicating a display position is detected. In addition, the correction method generates correction information for performing correction to increase the transmittance at a position where the luminance is determined to be low based on the brightness information of the black unevenness information according to the luminance information of the image to be displayed, Correction information is supplied to the video signal processing unit to correct the transmittance. The correction method performs correction to reduce the light emission amount of the light source unit based on the correction information according to the luminance information of the image to be displayed. According to the correction method of the present invention, black unevenness is improved because correction for increasing the transmittance and correction for reducing the light emission amount of the light source unit are performed based on the black unevenness information of the display unit detected in the full screen black display state. . In addition, since the correction for reducing the light emission amount of the light source unit is performed according to the luminance information of the image, the correction method can widen the luminance width that can be used for displaying the image. For this reason, the correction method of the present invention can prevent a decrease in contrast. Thereby, the correction method of the present invention can improve black unevenness while maintaining contrast.

It is a block diagram which shows the display correction system by this embodiment. It is a figure which shows the correction principle in the same embodiment. It is a flowchart which shows the correction process in the embodiment.

Hereinafter, a correction method and a display device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a display correction system using a display device and an adjustment jig according to the present embodiment.
A display correction system 100 shown in FIG. 1 includes an LCD (Liquid Crystal Display) monitor 1 and an adjustment jig 2 which are display devices.

The LCD monitor 1 includes a signal receiving unit 10, a video signal processing unit 20, a control unit 30, an EEPROM (Electrically Erasable Programmable Read Only Memory) 40, an LVDS (Low voltage differential signaling) interface unit 50, a liquid crystal panel 60, and a backlight unit. 70.
The signal receiving unit 10 is connected to the video signal processing unit 20 through a signal line. The signal receiving unit 10 receives a video signal such as a video signal supplied from an external device (not shown) and supplies it to the video signal processing unit 20.

The video signal processing unit 20 is disposed between the signal receiving unit 10 and the LVDS interface unit 50. The video signal processing unit 20 is a scaler that converts the video signal supplied from the signal receiving unit 10 into a resolution usable by the LCD monitor 1. The video signal processing unit 20 generates a display signal whose resolution is converted based on the video signal, and supplies the generated display signal to the LVDS interface unit 50.
Further, the video signal processing unit 20 is connected to the control unit 30 through a control signal line. The video signal processing unit 20 corrects the display signal based on the correction information supplied from the control unit 30 via the control signal line. Further, the video signal processing unit 20 calculates APL (Average Picture Level) information that is average luminance information based on the video signal supplied from the signal receiving unit 10. The calculated APL information is supplied to the control unit 30 via the control signal line. The APL information indicates the value of the average luminance of the image to be displayed.

The LVDS interface unit 50 is disposed between the video signal processing unit 20 and the liquid crystal panel 60. The LVDS interface unit 50 converts the display signal supplied from the video signal processing unit 20 into a small amplitude differential signal used by the liquid crystal panel 60. The LVDS interface unit 50 supplies a small amplitude differential signal obtained by converting the display signal to the liquid crystal panel 60.
The liquid crystal panel 60 is a display unit having a display surface for displaying an image, and modulates the transmittance with respect to the light emitted from the backlight unit 70 based on a small amplitude differential signal supplied from the LVDS interface unit 50. To display the image.
The backlight unit 70 is a light source unit that is disposed on the back side of the display surface with respect to the liquid crystal panel 60 and emits light from the back side of the liquid crystal panel 60.

The control unit 30 is connected to the video signal processing unit 20 and the backlight unit 70 via a control signal line, and controls the video signal processing unit 20 and the backlight unit 70. The control unit 30 is connected to the EEPROM 40 via a signal line. The control unit 30 stores information supplied from the adjustment jig 2 in the EEPROM 40. Further, the control unit 30 generates correction information based on information obtained by referring to the EEPROM 40. The control unit 30 supplies the generated correction information to the video signal processing unit 20 to correct the transmittance of the liquid crystal panel 60. In addition, the control unit 30 controls the light emission amount of the backlight unit 70 based on the generated correction information. Here, the information supplied from the adjustment jig 2 is, for example, position information and brightness information on the liquid crystal panel 60 detected by measuring the state of full screen black display.
The EEPROM 40 is an electrically rewritable nonvolatile storage unit. The EEPROM 40 stores position information and brightness information on the liquid crystal panel 60 written by the control unit 30.

The adjustment jig 2 is a jig used for correcting the black unevenness of the LCD monitor 1, and is mainly used in an adjustment process before shipment of the LCD monitor 1. The adjustment jig 2 is connected to the LCD monitor 1 when performing the adjustment process.
Here, black unevenness will be described. The liquid crystal panel 60 has the lowest light transmittance when the full screen is displayed black. Further, the transmittance is not uniform due to light leakage in the peripheral portion of the liquid crystal panel 60 and changes in the liquid crystal due to pressure applied to the peripheral portion of the liquid crystal panel 60, and a bright portion is partially generated. This partially bright part is called black unevenness.

The adjustment jig 2 includes a camera unit 80 and an adjustment unit 90. The camera unit 80 is connected to the adjustment unit 90 via a signal line. The camera unit 80 is disposed to face the display surface of the LCD monitor 1, detects an image displayed on the liquid crystal panel 60, and supplies the detected image information to the adjustment unit 90.
The adjustment unit 90 is connected to the control unit 30 of the LCD monitor 1 via a signal line when performing the adjustment process. The adjustment unit 90 processes the image information supplied from the camera unit 80 and detects position information and brightness information on the liquid crystal panel 60. The adjustment unit 90 supplies the detected position information and brightness information on the liquid crystal panel 60 to the control unit 30.

Next, a black unevenness correction method according to this embodiment will be described.
FIG. 2 is a diagram showing the display correction principle in the present embodiment.
2A shows a state before black unevenness correction, FIG. 2B shows a state where liquid crystal transmittance correction is performed, and FIG. 2C shows a state where backlight correction is performed. 2, from the top, an image image showing the display state of the liquid crystal panel 60, an image image (brightness) waveform showing the luminance (brightness) in the cross section in the horizontal direction of the liquid crystal panel 60, and the liquid crystal panel 60 A liquid crystal transmittance waveform showing a change in transmittance and a backlight luminance (brightness) waveform showing a change in backlight luminance (brightness) are shown.

  FIG. 2A shows a state before correction of black unevenness. In this figure, the LCD monitor 1 is in a full screen black display state in which black is displayed on the entire screen of the liquid crystal panel 60. In this state, a bright portion (black unevenness) is generated in the vicinity of both left and right ends of the display panel 60 in the image 61 that shows the liquid crystal panel 60 as viewed from the front. Further, the image image waveform 91 in the cross section in the horizontal direction at that time also shows that the vicinity of both the left and right ends is brightened. Similarly, the liquid crystal transmittance waveform 21 indicates that the transmittance near the left and right ends is high. The backlight luminance waveform 71 indicates that uniform light is emitted at a certain level of brightness.

FIG. 2B shows a state in which the transmittance correction process for correcting the transmittance of the liquid crystal is performed in the state of FIG. The transmittance correction process is a correction that increases the transmittance of the liquid crystal panel 60 so that the vicinity of the center of the liquid crystal panel 60 where black unevenness does not occur is uniform with the brightness near the left and right ends where black unevenness occurs. I do. That is, in the transmittance correction process, correction is performed to increase the transmittance of the liquid crystal panel 60 so as to be uniform with the brightness at the brightest position in the portion where the black unevenness occurs. The liquid crystal transmittance waveform 22 shows this state. The correction for increasing the transmittance is performed by the video signal processing unit 20. By this transmittance correction processing, as shown by the image image 62 and the image image waveform 92, there is no display unevenness, but the display state becomes bright overall.
In this figure, a backlight luminance waveform 72 shows the same level of brightness as the backlight luminance waveform 71.

FIG. 2C shows a state in which a backlight correction process, which is a light source correction process, is performed in the state of FIG. In the backlight correction process, the amount of light emitted from the backlight unit 70 is reduced, and the entire screen of the liquid crystal panel 60 becomes equal to the black level (black brightness) of the central portion before correction shown in FIG. As described above, correction for reducing the light emission amount of the backlight unit 70 is performed. That is, as indicated by the backlight luminance waveform 73, the light source correction process performs a correction to reduce the light emission amount of the backlight unit 70 so as to be equal to the brightness at the darkest position before the transmittance of the liquid crystal panel 60 is corrected. . As a result, as shown by the image image 63 and the image image waveform 93, a uniform black without black unevenness is displayed as compared with the state shown in FIG.
In this figure, the liquid crystal transmittance waveform 23 shows the same waveform as the liquid crystal transmittance waveform 22.

Next, the operation of the correction method according to the present embodiment will be described with reference to FIGS.
FIG. 3 is a flowchart showing the correction process in the present embodiment.
In FIG. 3, the processes in step S <b> 301 and step S <b> 302 indicate processes in an adjustment process before shipment of the LCD monitor 1.
The adjustment jig 2 is connected to the LCD monitor 1 when performing the adjustment process. Specifically, the control unit 30 in the LCD monitor 1 is connected to the adjustment unit 90 in the adjustment jig 2 via a signal line. A camera unit 80 is disposed at a position facing the display surface of the liquid crystal panel 60.

  First, in step S <b> 301, the LCD monitor 1 displays a full screen black on the liquid crystal panel 60. This processing may be performed based on, for example, a video signal supplied from an external device (not shown). The camera unit 80 of the adjustment jig 2 detects an image displayed on the liquid crystal panel 60 and supplies the detected image information to the adjustment unit 90. The adjustment unit 90 processes the image information supplied from the camera unit 80 and detects position information and brightness information on the liquid crystal panel 60 for black unevenness. Then, the adjustment unit 90 supplies the detected position information and brightness information on the liquid crystal panel 60 to the control unit 30 of the LCD monitor 1 as black unevenness information of the liquid crystal panel 60.

  Next, in step S <b> 302, the control unit 30 of the LCD monitor 1 stores the black unevenness information of the liquid crystal panel 60 supplied from the adjustment unit 90 in the EEPROM 40. The adjustment process is completed by the process of step S302.

  Subsequent steps S303 and S304 indicate correction processing performed in a normal operation state in which display is performed based on a video signal supplied from an external device (not shown).

In step S303, the control unit 30 refers to the black unevenness information stored in the EEPROM 40, and generates correction information based on the black unevenness information. The correction information is information indicating a correction value that increases the transmittance of each position of the liquid crystal panel 60 so that the brightness is uniform with the brightness of the brightest position where the black unevenness occurs. The control unit 30 supplies the correction information generated based on the black unevenness information to the video signal processing unit 20.
The video signal processing unit 20 generates a display signal obtained by converting the resolution based on the video signal. Further, the video signal processing unit 20 performs correction for increasing the transmittance of the liquid crystal on the display signal based on the correction information supplied from the control unit 30, and supplies the correction to the LVDS interface unit 50. The LVDS interface unit 50 converts the display signal supplied from the video signal processing unit 20 into a small amplitude differential signal, and supplies the liquid crystal panel 60 with the small amplitude differential signal obtained by converting the display signal. Thus, correction (transmittance correction processing) is performed to increase the transmittance at each position of the liquid crystal panel 60 so that the brightness at the brightest position where the black unevenness occurs is uniform.

  Next, in step S304, the control unit 30 performs control to reduce the light emission amount of the backlight unit 70 based on correction information indicating a correction value for increasing the transmittance. That is, the control unit 30 reduces the light emission amount of the backlight unit 70 so as to be equal to the brightness (black display level) at the darkest position in the black unevenness information detected in the case of full screen black display. Take control. This is a correction for reducing the luminance of the screen by reducing the light emission amount of the backlight unit 70 from the luminance that has been increased by the largest transmittance correction value in the correction information. Therefore, the control unit 30 calculates control information for reducing the light emission amount of the backlight unit 70 from the maximum transmittance correction value of the correction information. This control information is calculated from the relationship (ratio) between the transmittance with respect to the luminance and the light emission amount. Thus, correction (light source correction processing) is performed to reduce the light emission amount of the backlight unit 70 so as to be equal to the brightness at the darkest position in the case of full screen black display.

It should be noted that the above-described transmittance correction processing (step S303 processing) and light source correction processing (step S304 processing) are performed by the control unit 30 when it is determined that the screen of the liquid crystal panel 60 is entirely dark. . In the determination, whether the APL information supplied from the video signal processing unit 20 via the control signal line by the control unit 30 is lower than a predetermined value (for example, a value of 1/4 of the maximum luminance value). It is determined whether or not. When it is determined that the APL information is lower than a predetermined value, the control unit 30 performs a transmittance correction process (process in step S303) and a light source correction process (process in step S304).
On the other hand, when there is a bright part in a part of the screen of the liquid crystal panel 60, the bright part may be saturated in the transmittance correction process (the process of step S303). Further, when the light source correction process (the process of step S304) is performed in this saturated state, the luminance may be lower than the luminance before correction. Therefore, the predetermined luminance value may be determined in consideration of whether most of the image to be displayed is saturated by the transmittance correction process (the process of step S303), for example.

  As described above, the correction method and the LCD monitor 1 according to the present embodiment display the entire screen black on the liquid crystal panel 60. The control unit 30 receives the black unevenness information of the liquid crystal panel 60 detected by the adjustment jig 2 with respect to the brightness information and position information of the full screen black display, and stores them in the EEPROM 40 which is a storage unit. In addition, when it is determined that the screen of the liquid crystal panel 60 is entirely dark based on the APL information supplied from the video signal processing unit 20, the control unit 30 performs transmittance correction processing (processing in step S303), and A light source correction process (the process of step S304) is performed. The control unit 30 performs a transmittance correction process for increasing the transmittance of the liquid crystal panel 60 based on the black unevenness information of the liquid crystal panel 60 detected in the full screen black display state (the process of step S303) and the light emission of the backlight unit 70. A light source correction process to reduce the amount (the process of step S304) is performed. For this reason, in the correction method and the LCD monitor 1 in the present embodiment, black unevenness can be improved.

  Further, the light source correction process (the process of step S304) is a process of performing a correction for reducing the light emission amount of the backlight unit 70 based on the correction information generated based on the black unevenness information. For this reason, in the correction method and the LCD monitor 1, it is possible to widen the luminance range that can be used for displaying an image. Thereby, the correction method and the LCD monitor 1 can prevent a decrease in contrast. That is, the correction method and the LCD monitor 1 according to the present embodiment can improve black unevenness while maintaining contrast.

  Further, the transmittance correction process (the process of step S303) is a correction process for increasing the transmittance so as to be uniform with the brightness at the brightest position where black unevenness occurs. Therefore, the control unit 30 can easily calculate the correction information from the black unevenness information including the brightness information of the full screen black display and the position information. The light source correction process (the process of step S304) is a correction process for reducing the light emission amount of the backlight unit 70 so as to be equal to the brightness at the darkest position in the case of full screen black display. Therefore, the control unit 30 can calculate control information for reducing the light emission amount of the backlight unit 70 from the maximum transmittance correction value of the correction information using the relationship (ratio) between the transmittance and the light emission amount with respect to the luminance. Further, the control unit 30 can correct black unevenness without performing complicated control such as controlling the brightness of the backlight for each display area. The correction method and the LCD monitor 1 according to the present embodiment can improve black unevenness by simple control compared to the correction method disclosed in Patent Document 1 or Patent Document 2.

  According to the embodiment of the present invention, the liquid crystal panel 60 that displays the image by modulating the transmittance with respect to the light based on the display signal, and the backlight unit 70 that irradiates the liquid crystal panel 60 with the light are supplied. A correction method in the LCD monitor 1 that includes a video signal processing unit 20 that generates a display signal for displaying an image on the liquid crystal panel 60 based on the video signal and corrects the display signal based on the correction information is provided on the liquid crystal panel 60. Displaying a full-screen black image, including brightness information for each display position detected for each display position as a display state of the full-screen black image displayed on the liquid crystal panel 60, and position information indicating the display position According to the black unevenness detection process (steps S301 and S302) for detecting black unevenness information and the luminance information (APL information) of the image to be displayed, the black image stored in the EEPROM 40 is stored. A transmittance correction process (step S303) of generating correction information for performing correction to increase the transmittance at a position where the luminance is determined to be low based on the brightness information of the information, and supplying the correction information to the video signal processing unit 20 ) And a light source correction process (step S304) for reducing the light emission amount of the backlight unit 70 based on the correction information in accordance with the luminance information (APL information) of the image to be displayed.

  In this correction method, correction for increasing the transmittance and correction for reducing the light emission amount of the backlight unit 70 are performed based on the black unevenness information of the liquid crystal panel 60 detected in the full screen black display state. Thereby, black unevenness is improved. In the light source correction process (step S304), correction for reducing the light emission amount of the backlight unit 70 is performed based on the correction information generated based on the black unevenness information in accordance with the luminance information (APL information) of the image. Is called. For this reason, in this correction method, the luminance width that can be used for displaying an image can be widened. Thereby, in this correction method, it is possible to prevent a decrease in contrast. That is, in the correction method according to the present embodiment, black unevenness can be improved while maintaining contrast.

The correction information shown in the present embodiment is information for increasing the transmittance so as to be uniform with the brightness at the brightest position among the black unevenness information detected in the case of full screen black display. Further, in the light source correction process (step S304), the light emission of the backlight unit 70 is made to be equal to the brightness of the darkest position among the black unevenness information detected in the case of full screen black display based on the correction information. Corrections are made to reduce the amount.
Thereby, the correction information can be calculated relatively easily from the black unevenness information including the brightness information of the full screen black display and the position information. In the light source correction process (step S304), control information for reducing the light emission amount of the backlight unit 70 can be easily calculated from the maximum transmittance correction value of the correction information. In the light source correction process (step S304), correction can be performed without performing complicated control such as controlling the brightness of the backlight for each display area. In this correction method, black unevenness can be improved by simple control.

Further, the luminance information of the image to be displayed shown in the present embodiment is average luminance information (APL information) calculated by the video signal processing unit 20 based on the video information, and the transmittance correction process and the light source correction process are averages. This is performed when the luminance information (APL information) is lower than a predetermined value.
Thereby, when there is a bright part on the screen of the liquid crystal panel 60, the bright part is saturated in the transmittance correction process (step S303), and the luminance is lower than the luminance before correction in the light source correction process (step S304). Can be prevented.

In addition, this invention is not limited to said embodiment, It can change in the range which does not deviate from the meaning of this invention. In the above embodiment, the form using the EEPROM 40 as the storage unit has been described. However, the present invention is not limited to this, and a form using a memory such as a flash memory or an SRAM (Static Random Access Memory) with a backup power source may be used. Further, although the embodiment using the LVDS interface as an interface for supplying a display signal to the liquid crystal panel 60 has been described, the present invention is not limited to this, and another embodiment using a small amplitude interface may be used, or a CMOS (Complementary Metal Oxide Semiconductor). ) A level interface may be used.
Further, in the above-described embodiment, a description has been given of a mode in which the process of displaying the full screen black on the liquid crystal panel 60 when performing the adjustment process is performed based on a video signal supplied from an external device (not shown). However, the present invention is not limited to this, and based on the control of the control unit 30, the video signal processing unit 20 may create a state in which the entire screen is displayed black without using the video signal.

Moreover, when performing an adjustment process, the control part 30 demonstrated the form which memorize | stores the positional information and brightness information on the liquid crystal panel 60 in the EEPROM 40 as black nonuniformity information of the liquid crystal panel 60. However, the present invention is not limited to this, and the control unit 30 previously generates correction information for increasing the transmittance and control information for reducing the light emission amount of the backlight unit 70 in step S302 of the adjustment process. Thus, it may be stored in the EEPROM 40.
Moreover, although the form which uses APL information which is average luminance information for the determination when the screen of the liquid crystal panel 60 is entirely dark has been described, the present invention is not limited to this, and other information may be used. For example, when the brightness of the entire screen is set by a key input operation by the user of the LCD monitor 1, a determination may be made based on the set brightness value. In this case, the determination when the screen of the liquid crystal panel 60 is entirely dark may be made based on whether or not the set luminance value is lower than a predetermined value. In addition, a sensor that detects the brightness of the screen may be provided to use the brightness information of the detected image.

  Further, the APL information may be calculated from information of all pixels for one screen of the video signal, or may be calculated from information of pixels thinned out by dividing the display area. Further, it may be calculated from the information of the pixel in the central portion of the liquid crystal panel 60 where the bright portion is likely to be saturated by increasing the transmittance.

  The LCD monitor 1 described above has a computer system inside. The process of the correction process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

DESCRIPTION OF SYMBOLS 1 LCD monitor 2 Adjustment jig 10 Signal receiving part 20 Video signal processing part 21, 22, 23 Liquid crystal transmittance waveform 30 Control part 40 EEPROM
DESCRIPTION OF SYMBOLS 50 LVDS interface part 60 Liquid crystal panel 61, 62, 63 Image image 70 Backlight part 71, 72, 73 Backlight luminance waveform 80 Camera part 90 Adjustment part 91, 92, 93 Image image waveform 100 Display correction system

Claims (4)

A display unit that modulates the transmittance of light based on the display signal to display an image, a light source unit that irradiates the light to the display unit, and the display signal based on the supplied video information, and A correction method in a display device comprising a video signal processing unit that corrects the display signal based on correction information,
Displaying a full-screen black image on the display unit, and displaying brightness information for each display position detected for each display position as a display state of the full-screen black image displayed on the display unit, and the display position Black unevenness detection process for detecting black unevenness information including position information;
According to the luminance information of the image to be displayed, generate the correction information for performing the correction to increase the transmittance at a position where the luminance is determined to be low based on the brightness information of the black unevenness information, A transmittance correction process for supplying the correction information to the video signal processing unit;
And a light source correction step of reducing a light emission amount of the light source unit based on the correction information in accordance with luminance information of the image to be displayed. The correction information is
Information for increasing the transmittance to be uniform with the brightness of the brightest position among the black unevenness information detected in the case of the full screen black display,
The light source correction process includes:
The light emission amount of the light source unit is reduced based on the correction information so as to be equal to the brightness of the darkest position among the black unevenness information detected in the case of the full screen black display. Item 2. The correction method according to Item 1. The luminance information of the image to be displayed is average luminance information calculated based on the video information by the video signal processing unit,
The transmittance correction process and the light source correction process are:
The correction method according to claim 1, wherein the correction is performed when the average luminance information is lower than a predetermined value. A display unit that displays an image by modulating the transmittance of light based on a display signal;
A light source unit for irradiating the display unit with the light;
A video signal processing unit that generates the display signal based on supplied video information and corrects the display signal based on correction information;
Displaying a full-screen black image on the display unit, and displaying brightness information for each display position detected for each display position as a display state of the full-screen black image displayed on the display unit, and the display position Receive black spot information including location information,
According to the luminance information of the image to be displayed, generate the correction information for performing the correction to increase the transmittance at a position where the luminance is determined to be low based on the brightness information of the black unevenness information, A transmittance correction process for supplying the correction information to the video signal processing unit;
And a control unit that performs a light source correction process for reducing a light emission amount of the light source unit based on the correction information in accordance with luminance information of the image to be displayed.

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