JP2016061876A - Image display device, calibration device, light guide member, method for controlling image display device, method for controlling calibration device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of performing the calibration of an external light sensor, without using a reference light source.SOLUTION: An image display device is an image display device including the external light sensor detecting external light and includes calibration means for performing the calibration of the external light sensor on the basis of the detection value of the external light sensor. A light guide member for guiding light emitted from the screen of the image display device to the external light sensor is attachable to/detachable from the image display device. When the light guide member is attached to the image display device, the external light sensor detects the light emitted from the screen as the external light. The calibration means performs the calibration of the external light sensor on the basis of the detection value of the external light sensor when the light guide member is attached to the image display device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image display device, a calibration device, a light guide member, a control method for the image display device, a control method for the calibration device, and a program.

  There is an image display device having an external light sensor. In such an image display device, for example, image processing based on a detection value of an external light sensor (a value representing at least one of luminance and chromaticity of external light) is performed on the image data to be displayed, and the corrected image is displayed. An image based on the data is displayed on the screen. By performing the image processing, it is possible to display an image with suitable image quality regardless of the installation environment of the image display device.

However, the image display apparatus has individual differences in the detection characteristics of the external light sensor (corresponding relationship between the external light value and the external light sensor detection value).
For example, when an external light sensor is attached to the image display device, the individual difference may occur due to a change in detection characteristics depending on attachment accuracy. Specifically, when the mounting position of the external light sensor changes, the amount of light incident on the external light sensor changes, and the detection characteristics change. As a result, the individual difference occurs.
In addition, when manufacturing an external light sensor, individual differences depending on manufacturing accuracy may occur.
Therefore, it is necessary to calibrate the external light sensor in order to obtain a detection value that represents the value of the external light with high accuracy.

  Conventionally, calibration of an external light sensor has been performed before shipment from a factory using a reference light source and a photometric sensor. Specifically, the light from the reference light source is measured by the photometric sensor, and the detection value of the external light sensor is determined based on the measurement value of the photometric sensor (a value representing at least one of the luminance and chromaticity of the light from the reference light source). A target value is determined. Then, the light from the reference light source is detected by the external light sensor, and the external light sensor is calibrated based on the detection value of the external light sensor and the target value. For example, a halogen lamp is used as the reference light source. As the photometric sensor, for example, a highly accurate photometric sensor that guarantees the accuracy of measurement values, repeatability, and the like is used.

A predetermined time is required until light having stable luminance and chromaticity is emitted from the reference light source.
In addition, a predetermined time is required until the measurement value of the photometric sensor is stabilized and the measurement value that represents the light value with high accuracy can be acquired.
Therefore, when determining the target value, it is necessary to measure the light from the reference light source using the photometric sensor after sufficiently aging until the reference light source and the photometric sensor are stabilized.

However, the detection characteristics of the external light sensor may change even after shipment from the factory. For example, the detection characteristics may change due to deterioration of the external light sensor. In addition, the external light sensor may fail after shipment from the factory.
A technique for detecting a sensor failure is disclosed in Patent Document 1, for example. Patent Document 1 discloses a technique for detecting a failure of a luminance sensor built in an image display device.

When the detection characteristics of the external light sensor change, it is necessary to calibrate the external light sensor.
In addition, when the external light sensor fails, the external light sensor needs to be replaced. As described above, when the external light sensor is attached to the image display device, the detection characteristics of the external light sensor may change. Therefore, even when the external light sensor fails, the external light sensor may need to be calibrated.

In the conventional method, a reference light source and a photometric sensor having stable light emission characteristics are required even when the external light sensor is calibrated at a place other than the factory (use site of the image display device, service base, etc.). For this reason, in the conventional method, in order to quickly start calibration of the external light sensor, it is necessary to previously perform a stabilization process for stabilizing the light emission characteristics on the plurality of reference light sources. In addition, in order to quickly start calibration of the external light sensor, it is necessary to perform in advance a stabilization process that stabilizes the measurement values of the photometric sensors with respect to the plurality of photometric sensors. For example, when the target value of the detection value of the external light sensor is determined using a reference light source and a photometric sensor whose emission characteristics are stabilized for each service base, the stability of the reference light source and the photometric sensor is determined for each service base. Need to be processed.
In the conventional method, not only the power source of the image display device but also the power source of the reference light source is required. In places other than the factory (especially a residence), the power source of the reference light source may not be easily secured.
Thus, in the conventional method, the work for starting calibration of the external light sensor is complicated and difficult.
Therefore, with the conventional method, it is difficult to calibrate the external light sensor at a place other than the factory.

JP 2012-37540 A

  An object of this invention is to provide the technique which can calibrate an external light sensor, without using a reference | standard light source.

The first aspect of the present invention is:
An image display device having an external light sensor for detecting external light,
Calibration means for calibrating the outside light sensor based on the detection value of the outside light sensor;
A light guide member that guides light emitted from the screen of the image display device to the external light sensor is detachable from the image display device;
When the light guide member is attached to the image display device, the outside light sensor detects light emitted from the screen as the outside light,
In the image display device, the calibration unit calibrates the external light sensor based on a detection value of the external light sensor when the light guide member is attached to the image display device. .

The second aspect of the present invention is:
A calibration device usable with an image display device having an external light sensor for detecting external light,
Obtaining means for obtaining a detection value of the external light sensor;
Calibration means for calibrating the external light sensor based on the detection value of the external light sensor;
Have
A light guide member that guides light emitted from the screen of the image display device to the external light sensor is detachable from the image display device;
When the light guide member is attached to the image display device, the outside light sensor detects light emitted from the screen as the outside light,
The calibration unit is a calibration device that calibrates the external light sensor based on a detection value of the external light sensor when the light guide member is attached to the image display device.

The third aspect of the present invention is:
An incident part where light is incident;
An exit for emitting light incident on the entrance; and
A light guide member having
The light guide member is detachable from an image display device having an external light sensor for detecting external light,
When the light guide member is attached to the image display device, the light guide member guides light emitted from the screen of the image display device to the external light sensor. is there.

The fourth aspect of the present invention is:
A control method for an image display apparatus having an external light sensor for detecting external light,
An acquisition step of acquiring a detection value of the external light sensor;
A calibration step for calibrating the external light sensor based on the detection value of the external light sensor;
Have
A light guide member that guides light emitted from the screen of the image display device to the external light sensor is detachable from the image display device;
When the light guide member is attached to the image display device, the outside light sensor detects light emitted from the screen as the outside light,
In the calibration step, the external light sensor is calibrated based on a detection value of the external light sensor when the light guide member is attached to the image display device. Is the method.

According to a fifth aspect of the present invention,
A control method for a calibration device that can be used with an image display device having an external light sensor for detecting external light,
An acquisition step of acquiring a detection value of the external light sensor;
A calibration step for calibrating the external light sensor based on the detection value of the external light sensor;
Have
A light guide member that guides light emitted from the screen of the image display device to the external light sensor is detachable from the image display device;
When the light guide member is attached to the image display device, the outside light sensor detects light emitted from the screen as the outside light,
In the calibration step, the external light sensor is calibrated based on a detection value of the external light sensor when the light guide member is attached to the image display device. It is.

A sixth aspect of the present invention is a program that causes a computer to execute each step of the above-described control method of the image display apparatus.
According to a seventh aspect of the present invention, there is provided a program that causes a computer to execute each step of the calibration device control method described above.

  According to the present invention, the external light sensor can be calibrated without using a reference light source.

Example of configuration of image display apparatus according to embodiment 1 Example of arrangement of image display device, photometric sensor, and light guide member according to embodiment 1 Example of calibration method of external light sensor according to embodiment 1 Example of correction data according to the first embodiment Example of structure of light guide member according to embodiment 2 Example of structure of light guide member according to embodiment 3

<Example 1>
Hereinafter, an image display device, a calibration device, a light guide member, a control method for the image display device, and a control method for the calibration device according to Embodiment 1 of the present invention will be described.
In this embodiment, an example in which the image display device has the function of a calibration device will be described. However, the calibration device may be a separate device from the image display device. The calibration device according to the present embodiment may be any device as long as it can be used with an image display device having an external light sensor.

FIG. 1 is a block diagram illustrating an example of the configuration of the image display apparatus according to the present embodiment. FIG. 1 also shows a light guide member and a photometric sensor according to this embodiment.
As shown in FIG. 1, the image display apparatus 100 according to the present embodiment includes a display unit 101, an external light sensor 102, a control unit 103, and the like.
In addition, as shown in FIG. 1, the light guide member 104 and the photometric sensor 105 are detachable from the image display device 100 (or can be installed and removed).

  The display unit 101 displays an image based on the image data on the screen. For example, the display unit 101 displays an image based on image data input to an input unit (not shown) included in the image display device 100 on the screen. Further, the display unit 101 displays an image based on image data generated inside the image display device 100 on the screen. As the display unit 101, a liquid crystal display panel, an organic EL display panel (OLED panel), a plasma display panel, or the like can be used.

  The external light sensor 102 detects external light and outputs a detection value representing the detected external light to the control unit 103. Specifically, the external light sensor 102 detects at least one of luminance and chromaticity of external light. The external light sensor 102 outputs a value representing at least one of the luminance and chromaticity of the external light as a detection value. The format of the detection value is not particularly limited. For example, the external light sensor 102 outputs an RGB value as the detection value. As the external light sensor 102, for example, a photosensor having an A / D converter can be used. In such a photosensor, light incident on the photosensor is converted into an analog value. Then, A / D conversion is performed on the obtained analog signal, and a digital value is acquired as a detection value.

The control unit 103 includes, for example, a microcomputer chip, a memory, and peripheral circuits.
The control unit 103 has the following functions.
-Function for setting the operation mode of the image display device 100-Function for causing the display unit 101 to perform image display (display control processing)
A function for acquiring the detection value of the external light sensor 102 (first function of the calibration apparatus according to the present embodiment)
A function for calibrating the external light sensor based on the detection value of the external light sensor 102 (second function of the calibration apparatus according to the present embodiment)
A function for performing image processing based on the detection value of the external light sensor 102 on image data to be displayed (for example, the input image data described above). At least one of the four functions of the control unit 103 is other than the control unit 103. The functional part may have.

In the present embodiment, any of a plurality of operation modes including a normal mode and a calibration mode can be set as the operation mode.
The normal mode is an operation mode set during normal use. The control unit 103 performs image processing based on the detection value of the external light sensor 102 on the display target image data when the normal mode is set. The display unit 101 displays an image based on the image data after the image processing on the screen. In the image processing based on the detection value of the external light sensor 102, the image quality of the image data to be displayed is corrected based on the detection value of the external light sensor 102. Specifically, the luminance and chromaticity of the image data to be displayed are corrected based on the detection value of the external light sensor 102. Thereby, an image with suitable image quality can be displayed regardless of the installation environment of the image display apparatus 100.
The calibration mode is an operation mode that is set when the external light sensor 102 is calibrated. The control unit 103 calibrates the external light sensor 102 when the calibration mode is set. The calibration of the external light sensor 102 is a process of generating or updating correction data for correcting the detection value of the external light sensor 102, for example.

  The operation mode setting method is not particularly limited. For example, the operation mode may be set according to a user operation on the image display device 100. Further, the image display device 100 may include a determination unit that determines whether or not the light guide member 104 is attached to the image display device 100. The normal mode is set when it is determined that the light guide member 104 is not attached to the image display device 100, and the calibration mode is determined when it is determined that the light guide member 104 is attached to the image display device 100. May be set. As the determination unit, for example, a switch that is pressed when the light guide member 104 is attached to the image display device 100 can be used.

  When the light guide member 104 is attached to the image display device 100, the light guide member 104 guides light emitted from the screen to the external light sensor 102 (the light receiving surface of the external light sensor 102). Therefore, when the light guide member 104 is attached to the image display device 100, the external light sensor 102 detects light (screen light) emitted from the screen as external light, and outputs a detection value representing the screen light. To do. The light guide member 104 is attached to the image display device 100 when the external light sensor 102 is calibrated. Then, the control unit 103 calibrates the external light sensor 102 based on the detection value of the external light sensor 102 when the light guide member 104 is attached to the image display device 100.

  When the photometric sensor 105 is attached (or installed) to the image display device 100, the photometric sensor 105 measures screen light. Specifically, the photometric sensor 105 measures at least one of the luminance and chromaticity of the screen light. As the photometric sensor 105, for example, a non-contact type photometric sensor, a contact type photometric sensor, or the like can be used. Examples of the non-contact type photometric sensor include a spectral radiation type photometric sensor and a filter type photometric sensor. An example of the contact-type photometric sensor is a filter-type photometric sensor. In this embodiment, the photometric sensor 105 is used when determining a display setting value (pixel value) that can obtain reference light as light emitted from the screen. When the display unit 101 is a liquid crystal display panel, a combination of a pixel value and a backlight emission luminance may be determined as a display setting value. The reference light is, for example, light equivalent to light from a conventional reference light source.

Although details will be described later, in this embodiment, the value of the reference light (the target value of the detection value of the external light sensor 102; the sensor target value) is determined in advance. Then, the control unit 103 starts from at least a part of the screen so that the reference light is guided to the external light sensor 102 by the light guide member 104 when the light guide member 104 is attached to the image display device 100. The display unit 101 is caused to display an image in which the reference light is emitted. Thereafter, the control unit 103 calibrates the external light sensor 102 based on the detection value of the external light sensor 102 when the light guide member 104 is mounted on the image display device 100 and the value of the reference light. .
Specifically, in this embodiment, each value (sensor target value) of a plurality of reference lights is determined in advance. Then, the control unit 103 causes the display unit 101 to perform image display in which a plurality of reference lights are sequentially emitted from at least a partial region of the screen when the light guide member 104 is attached to the image display device 100. . Thereafter, the control unit 103 calibrates the outside light sensor 102 based on the plurality of detection values obtained by the outside light sensor 102 detecting the plurality of reference lights and the plurality of sensor target values.

  FIG. 2A is a front view showing an example of the arrangement of the image display device 100 and the photometric sensor 105. FIG. 2B is a front view illustrating an example of the arrangement of the image display device 100 and the light guide member 104. FIG. 2C is a side view showing an example of the configuration of the light guide member 104. In FIG. 2A, the photometric sensor 105 is attached (or installed) to the image display device 100, and in FIGS. 2B and 2C, the light guide member 104 is attached to the image display device 100. Yes. The “front view” is a view of the member as viewed from the front of the image display device 100, and the “side view” is a view of the member as viewed from the side of the image display device 100.

  As shown in FIG. 2A, the photometric sensor 105 is arranged on the screen so that the light receiving surface of the photometric sensor 105 faces the screen.

As shown in FIG. 2C, the light guide member 104 has an incident part where light is incident and an emitting part which emits light incident on the incident part.
2 (b) and 2 (c), the light guide member 104 has the screen light incident on the incident portion and the light emitted from the emission portion on the light receiving surface of the external light sensor 102. It is attached to the image display device 100 so as to be incident. In other words, the light guide member 104 is mounted on the image display device 100 such that the incident part faces the screen and the emission part faces the external light sensor 102 (the light receiving surface of the external light sensor 102). .

  In this embodiment, a member having a hollow structure is used as the light guide member 104 as shown in FIG. Specifically, a member having a through hole through which screen light passes when the light guide member 104 is mounted on the image display device 100 is used as the light guide member 104.

The method for creating the light guide member 104 is not particularly limited. For example, the light guide member 104 may be created by processing one member. As processing of the member, for example, bending processing, cutting processing, adhesion, and the like are performed. Moreover, the light guide member 104 may be created by combining a plurality of members. For example, the light guide member 104 may be created by bonding a plurality of plate-like members using an adhesive.
The inner surface of the light guide member 104 (the surface on the through hole side) is subjected to a surface treatment that increases the light reflectance so that light incident on the incident portion is efficiently emitted from the emission portion. preferable. For example, the inner surface of the light guide member 104 is preferably painted white.
In addition, in order to suppress that the light different from the light radiate | emitted from the output part is irradiated to the light-receiving surface of the external light sensor 102, the magnitude | size of the through-hole by the side of an output part (inner diameter of the light guide member 104) The outer light sensor 102 is preferably larger than the light receiving surface.

  The light guide member 104 is attached to the image display device 100 so that light incident on the incident portion and light irradiated on the light receiving surface of the external light sensor 102 are not affected by external light. Is preferred. For example, a flexible member sandwiched between the light guide member 104 and the image display device 100 when the light guide member 104 is attached to the image display device 100 may be provided in the incident portion and the emission portion. As the flexible member, for example, a felt member can be used. Further, the light guide member 104 may be attached to the image display device 100 so that the interval between the incident portion and the image display device 100 and the interval between the emission portion and the image display device 100 are equal to or less than a threshold value.

In addition, it is preferable that the area | region (area | region in a screen; screen area | region) which emits the light which the photometry sensor 105 measures is equal to the screen area | region facing the entrance plane of the light guide member 104. FIG. However, when the light emitted from the screen is uniform within the screen, the screen area that emits the light measured by the photometric sensor 105 may be different from the screen area facing the incident surface of the light guide member 104. Specifically, when the luminance (display luminance) on the screen and the chromaticity (display chromaticity) on the screen are uniform within the screen, the screen region that emits light measured by the photometric sensor 105 is guided. It may be different from the screen area facing the incident surface of the member 104.

  Note that the light guide member 104 shown in FIG. 2D may be used instead of the light guide member 104 shown in FIG. The light guide member 104 shown in FIG. 2D is a member having a non-hollow structure and high transparency. As the light guide member 104 having high transparency, for example, an acrylic member can be used. The light guide member 104 shown in FIG. 2D has an incident surface that is an incident portion and an output surface that is an output portion. Surfaces other than the entrance surface and the exit surface are subjected to surface treatment that suppresses light leakage from the light guide member 104 and light incidence into the light guide member 104. As the surface treatment, a treatment for coating, a treatment for providing unevenness, and the like are performed.

  An example of a calibration method according to the present embodiment (a method for calibrating the external light sensor 102) will be described with reference to the flowchart of FIG. The processing of S301 to S304 in FIG. 3 is performed in advance at a factory that manufactures the image display device 100, for example. The processes of S305 to S309 in FIG. 3 are performed when the external light sensor 102 is calibrated.

Prior to the processing of S301, the photometric sensor 105 is mounted (or installed) on the image display device 100.
Then, the control unit 103 transmits a command (instruction) for displaying an image of setting candidate values over the entire first screen area to the display unit 101 (S301). As a result, an image of the setting candidate value is displayed over the entire first screen area. The setting candidate value is a candidate for the above-described display setting value (pixel value, backlight emission luminance, etc.). The first screen area is a screen area including at least a screen area facing the light receiving surface of the photometric sensor 105. The setting candidate value is set by the control unit 103, for example.

  Next, the photometric sensor 105 measures light from the screen (S302). As described above, the first screen area is a screen area including at least the screen area facing the light receiving surface of the photometric sensor 105. In step S301, an image of the setting candidate value is displayed over the entire first screen area. Therefore, in S302, the light emitted from the screen with the setting candidate value is measured. The measurement value of the photometric sensor 105 is input to the control unit 103. The format of the measurement value is not particularly limited, but in the present embodiment, the photometric sensor 105 outputs a CIE XYZ color system value (XYZ tristimulus value) as the measurement value.

Then, the control unit 103 determines whether or not the measurement value obtained in S302 matches a predetermined sensor target value (S303). If it is determined that the measured value does not match the sensor target value (S303: NO), the process returns to S301, and the setting candidate value is changed until it is determined that the measured value matches the sensor target value. The processes of S303 are repeated. When it is determined that the measured value matches the sensor target value, the process proceeds to S304.
Note that it may be determined that the measured value matches the sensor target value only when the measured value completely matches the sensor target value, or the measured value when the difference between the measured value and the sensor target value is less than or equal to the threshold value. May be determined to match the sensor target value.

In S304, the control unit 103 stores the current setting candidate value as a display setting value.
Note that the image display apparatus 100 may include a storage unit, and display setting values may be recorded in the storage unit.

In the present embodiment, a plurality of sensor target values are determined in advance, and the processing of S301 to S304 is performed for each sensor target value. Thereby, a display set value for each sensor target value is obtained. Specifically, each of the seven lights having D65 of 0, 50, 125, 250, 375, 500, 625 [cd / m ² ] is predetermined as the reference light. Each value is predetermined as a sensor target value. And the process of S301-S304 is performed about each of seven sensor target values. Thereby, seven display setting values respectively corresponding to the seven sensor target values are obtained.
After all display setting values are obtained, the photometric sensor 105 is detached from the image display device 100.

Next, the light guide member 104 is attached to the image display device 100 (S305). The light guide member 104 and the photometric sensor 105 are attached to and detached from the image display device 100 manually, for example.
Then, the control unit 103 transmits a command for displaying an image of the display set value over the entire second screen area to the display unit 101 (S306). As a result, an image of the display setting value is displayed over the entire second screen area. The second screen area is a screen area including at least a screen area facing the incident portion of the light guide member 104.
In the present embodiment, seven commands respectively corresponding to the seven display setting values are sequentially transmitted to the display unit 101. Thereby, the image display in which the seven reference lights are emitted in order from the second screen area is performed.

And the control part 103 acquires the detection value of the external light sensor 102 from the external light sensor 102 (S307). In S307, a detection value representing the reference light is acquired. Specifically, for each display setting value, the detection value of the external light sensor when the image of the display setting value is displayed is acquired. Thereby, seven detection values representing the seven reference lights are acquired. In this embodiment, it is assumed that a value of the CIE XYZ color system (XYZ tristimulus value) is acquired as a detection value.
Note that the control unit 103 may acquire and use one detection value of the external light sensor 102 or may not. For example, the control unit 103 may acquire a plurality of detection values of the external light sensor 102 and use an average value of the acquired plurality of detection values. In particular, it is preferable to use the average value as a detection value representing low-luminance reference light.

Next, the control unit 103 generates or updates correction data for correcting the detection value of the external light sensor 102 based on the seven detection values obtained in S307 and the seven sensor target values ( S308). The external light sensor 102 is calibrated by this processing. The correction data is, for example, data (function or table) representing a correspondence relationship between a detection value before correction corresponding to the sensor target value and a detection value after correction corresponding to the sensor target value. Such correction data can be generated, for example, by associating the sensor target value with the detection value obtained in S307.
Then, the control unit 103 stores the correction data generated in S308 (S309).
Note that the image display apparatus 100 may include a storage unit, and correction data may be recorded in the storage unit.
After the process of S309, the light guide member 104 is detached from the image display device 100.

The number of reference lights may be more or less than seven.
In this embodiment, the example in which the D65 light is used as the reference light has been described, but the present invention is not limited to this. For example, D50 light may be used as the reference light. Further, both D65 light and D50 light may be used as the reference light. If both the D65 light and the D50 light are used as the reference light, more accurate calibration can be performed.

FIG. 4 shows an example of the correction data.
The correction data in FIG. 4 represents the correspondence between the Y value that is the detection value before correction and the Y value that is the detection value after correction. Hereinafter, the Y value before correction is described as “Ya value”, and the Y value after correction is described as “Yb value”.
In the present embodiment, in the normal mode, the control unit 103 inputs the Ya value obtained when the external light sensor 102 detects external light to the correction data. When a Ya value is input to the correction data, a Yb value is output from the correction data.
For example, a Ya value 5000 is converted to a Yb value 50, and a Ya value 12500 is converted to a Yb value 125. Further, the Yb value corresponding to the Ya value other than the Ya value represented by the correction data is acquired by performing an interpolation process using a plurality of Ya values and a plurality of Yb values represented by the correction data. For example, the Yb value 75 corresponding to the Ya value 7500 is obtained by performing linear interpolation processing using the combination of the Ya value 5000 and the Yb value 50 and the combination of the Ya value 12500 and the Yb value 125.
Then, the control unit performs image processing based on the Yb value output from the correction data on the image data to be displayed. Thereby, an image with suitable image quality can be displayed regardless of the installation environment of the image display apparatus 100.

When such a correction (conversion) of the Y value is performed, if the correspondence relationship represented by the correction data is incorrect, a Yb value greatly different from the Y value of the external light is obtained. As a result, an image with a suitable image quality may not be displayed.
In the present embodiment, by performing the processing of S305 to S309 in FIG. 3, the correspondence relationship represented by the correction data can be returned (closer) to the accurate correspondence relationship. As a result, a Yb value equal to (substantially equal to) the Y value of external light can be obtained in the normal mode, and an image with a suitable image quality can be displayed.

  In this embodiment, the example in which the correction data indicating the correspondence between the Y value before correction and the Y value after correction is generated has been described. However, the correction data is not limited to this. For example, correction data representing the correspondence between the XYZ tristimulus values before correction and the XYZ tristimulus values after correction may be generated, or the correspondence between the spectral values before correction and the spectral values after correction may be expressed. Correction data may be generated. Further, correction data representing a correction coefficient to be multiplied to the detection value before correction, a correction value to be added to the detection value before correction, and the like may be generated.

  As described above, according to the present embodiment, the external light sensor is calibrated using the screen light instead of the light emitted from the reference light source. Thereby, the external light sensor can be calibrated without using the reference light source. As a result, the work for starting the calibration of the external light sensor can be easily performed regardless of the location where the calibration of the external light sensor is performed, and the calibration of the external light sensor can be easily performed. For example, the work for starting the calibration of the external light sensor can be easily performed at a place other than the factory, and the calibration of the external light sensor can be easily performed.

<Example 2>
Hereinafter, the light guide member according to the second embodiment of the present invention will be described.
Note that a description of the same configurations and functions as those in the first embodiment will be omitted.

The light guide member 104 according to the present embodiment includes one or more mirrors that reflect screen light when the light guide member 104 is attached to the image display apparatus 100.
FIG. 5 is a diagram illustrating an example of the configuration of the light guide member 104 according to the present embodiment. In the example of FIG. 5, the light guide member 104 is attached to the image display device 100. The light guide member 104 in FIG. 5 includes two mirrors 501a and 501b.
In this embodiment, as shown in FIG. 5, when the light guide member 104 is mounted on the image display device 100, the screen light is reflected by the two mirrors 501a and 501b, and the outside light sensor 102 (outside light It is guided to the light receiving surface of the sensor 102.
In addition, although the example of the light guide member which has two mirrors was shown in FIG. 5, the number of mirrors may be more or less than two. The light guide member may have one mirror that reflects screen light toward the external light sensor 102 when the light guide member 104 is mounted on the image display device 100. For example, the light guide member may have one mirror having a non-planar reflecting surface.

  Even when the light guide member according to the present embodiment is used, the same effects as those of the first embodiment can be obtained.

<Example 3>
Hereinafter, the light guide member according to the third embodiment of the present invention will be described.
Note that a description of the same configurations and functions as those in the first embodiment will be omitted.

FIG. 6 is a diagram illustrating an example of the configuration of the light guide member 104 according to the present embodiment. In the example of FIG. 6, the light guide member 104 is attached to the image display device 100.
As shown in FIG. 6, the light guide member 104 according to this embodiment is an optical fiber 601.
In this embodiment, as shown in FIG. 6, when the optical fiber 601 is attached to the image display device 100, one end (incident part) of the optical fiber 601 faces the screen, and the other end (exit) of the optical fiber 601. Part) faces the external light sensor 102. Then, screen light is incident on one end of the optical fiber 601, and light is emitted from the other end of the optical fiber 601 toward the external light sensor 102 (the light receiving surface of the external light sensor 102). That is, in this embodiment, when the optical fiber 601 is mounted on the image display device 100, the screen light passes through the optical fiber 601 and is guided to the external light sensor 102 (the light receiving surface of the external light sensor 102). .

  Even when the light guide member according to the present embodiment is used, the same effects as those of the first embodiment can be obtained.

<Other examples>
The present invention can also be implemented by a system (or a device such as a CPU or MPU) of a system or apparatus that implements the functions of the above-described embodiments by reading and executing a program recorded in a storage device. The present invention can also be implemented by a method comprising steps executed by a computer of a system or apparatus that implements the functions of the above-described embodiments by reading and executing a program recorded in a storage device, for example. . For this purpose, the program is stored in the computer from, for example, various types of recording media that can serve as the storage device (ie, computer-readable recording media that holds data non-temporarily). Provided to. Therefore, the computer (including devices such as CPU and MPU), the method, the program (including program code and program product), and the computer-readable recording medium that holds the program non-temporarily are all present. It is included in the category of the invention.

  DESCRIPTION OF SYMBOLS 100: Image display apparatus 102: External light sensor 103: Control part 104: Light guide member

Claims (17)

An image display device having an external light sensor for detecting external light,
Calibration means for calibrating the outside light sensor based on the detection value of the outside light sensor;
A light guide member that guides light emitted from the screen of the image display device to the external light sensor is detachable from the image display device;
When the light guide member is attached to the image display device, the outside light sensor detects light emitted from the screen as the outside light,
The image display apparatus characterized in that the calibration means calibrates the external light sensor based on a detection value of the external light sensor when the light guide member is attached to the image display apparatus. The reference light value is predetermined,
The image display device includes:
Display means for displaying an image based on the image data on the screen;
When the light guide member is attached to the image display device, the reference light is emitted from at least a part of the screen so that the reference light is guided to the external light sensor by the light guide member. Display control means for causing the display means to perform image display,
Further comprising
The calibration means calibrates the external light sensor based on a detection value of the external light sensor when the light guide member is attached to the image display device and a value of the reference light. The image display apparatus according to claim 1. Each value of the plurality of reference lights is predetermined,
The display control means performs an image display on the display means in which the plurality of reference lights are emitted in order from at least a part of the screen when the light guide member is attached to the image display device. Let
The calibration unit is configured to calibrate the external light sensor based on a plurality of detection values obtained by the external light sensor detecting the plurality of reference lights and values of the plurality of reference lights. The image display device according to claim 2, wherein: As the operation mode of the image display device, any one of a plurality of operation modes including a normal mode and a calibration mode can be set.
The image display device further includes image processing means for performing image processing based on a detection value of the external light sensor on display target image data when the normal mode is set,
The image display device according to claim 1, wherein the calibration unit calibrates the external light sensor when the calibration mode is set. Determining means for determining whether or not the light guide member is attached to the image display device;
The normal mode is set when it is determined that the light guide member is not attached to the image display device, and the calibration mode is determined when it is determined that the light guide member is attached to the image display device. A setting means for setting
The image display device according to claim 4, further comprising: The image display apparatus according to claim 1, wherein the calibration of the external light sensor is a process of generating or updating correction data for correcting a detection value of the external light sensor. The image display apparatus according to claim 1, wherein the detection value of the external light sensor represents at least one of luminance and chromaticity of the external light. A calibration device usable with an image display device having an external light sensor for detecting external light,
Obtaining means for obtaining a detection value of the external light sensor;
Calibration means for calibrating the external light sensor based on the detection value of the external light sensor;
Have
A light guide member that guides light emitted from the screen of the image display device to the external light sensor is detachable from the image display device;
When the light guide member is attached to the image display device, the outside light sensor detects light emitted from the screen as the outside light,
The calibration device, wherein the calibration means calibrates the external light sensor based on a detection value of the external light sensor when the light guide member is attached to the image display device. An incident part where light is incident;
An exit for emitting light incident on the entrance; and
A light guide member having
The light guide member is detachable from an image display device having an external light sensor for detecting external light,
When the light guide member is attached to the image display device, the light guide member guides light emitted from the screen of the image display device to the external light sensor. When the light guide member is attached to the image display device, the incident portion faces the screen of the image display device,
10. The light guide member according to claim 9, wherein when the light guide member is attached to the image display device, the emitting portion faces the external light sensor. The light guide member according to claim 9, further comprising a through hole through which light emitted from the screen passes when the light guide member is attached to the image display device. 11. The light guide member according to claim 9, further comprising at least one mirror that reflects light emitted from the screen when the light guide member is attached to the image display device. . The light guide member according to claim 9, wherein the light guide member is an optical fiber. A control method for an image display apparatus having an external light sensor for detecting external light,
An acquisition step of acquiring a detection value of the external light sensor;
A calibration step for calibrating the external light sensor based on the detection value of the external light sensor;
Have
A light guide member that guides light emitted from the screen of the image display device to the external light sensor is detachable from the image display device;
When the light guide member is attached to the image display device, the outside light sensor detects light emitted from the screen as the outside light,
In the calibration step, the external light sensor is calibrated based on a detection value of the external light sensor when the light guide member is attached to the image display device. Method. A control method for a calibration device that can be used with an image display device having an external light sensor for detecting external light,
An acquisition step of acquiring a detection value of the external light sensor;
A calibration step for calibrating the external light sensor based on the detection value of the external light sensor;
Have
A light guide member that guides light emitted from the screen of the image display device to the external light sensor is detachable from the image display device;
When the light guide member is attached to the image display device, the outside light sensor detects light emitted from the screen as the outside light,
In the calibration step, the external light sensor is calibrated based on a detection value of the external light sensor when the light guide member is attached to the image display device. .   A program for causing a computer to execute each step of the control method for an image display device according to claim 14.   A program for causing a computer to execute each step of the method for controlling a calibration apparatus according to claim 15.

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