JP2011085699A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that accuracy is degraded in the same use method as before, as brightness of a viewing direction does not always match camera automatic exposure (AE) information which is brightness of an optical axis direction of a camera, in so called vari-angle use in which a display monitor moves, although display brightness control which matches surrounding brightness change is needed in order to set brightness so that the display monitor is easy to see, and an illuminance sensor is provided on the same face with the display monitor, and camera AE information is used for a camera front direction which is an opposite direction of the display face, as a method for detecting surrounding brightness. <P>SOLUTION: Provided is a display device, wherein an illuminance detection sensor is provided on each of a display surface and a rear surface of the moving display monitor to detect the surrounding brightness. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device that adjusts the brightness of a display unit.

  Since visibility when viewing the display unit in the display device is affected by ambient brightness, it is known in the prior art to vary the brightness of the display unit according to ambient brightness. In an optical apparatus such as a camera provided with a display unit on the back, the brightness of the display unit is varied in order to increase the visibility of the display unit when reproducing and displaying a captured image or in various settings. As a method for detecting ambient brightness, a method based on AE information of a camera or a method in which an illuminance sensor is provided is known.

JP 2006-13255 A

  In order to detect ambient brightness, it is necessary to grasp the amount of light around the display unit when the display unit is watched and the amount of reflected light reflected from the display surface. The amount of light around the display unit is the amount of light incident from the direction centered on the back surface of the display unit relative to the normal of the display unit, and the reflected light from the display surface is the amount of light incident on the display surface from the user's back direction. Is reflected.

  However, in the so-called vari-angle method in which the display unit is movable, the camera AE information is the brightness in the camera optical axis direction and does not necessarily match the brightness in the gaze direction. Therefore, the conventional method is accompanied by a decrease in brightness control accuracy. This is particularly noticeable when the camera optical axis direction and the gaze direction are 90 degrees.

  Since the optical axis of the camera is generally close to the horizontal direction, when the display unit is watched, the gaze direction is often the sky or the ground. For this reason, if the gaze direction is empty, the visual field around the display unit is very bright, and it is dark and difficult to see unless the brightness of the display unit is increased. If the gaze direction is the ground, the peripheral visual field around the display unit is dark, and the brightness of the display unit needs to be lower than when the gaze direction is empty.

  In view of the above-described problems, an object of the present invention is to provide a display device that realizes highly accurate brightness control with a vari-angle display device in which a display unit is movable.

  In order to achieve the above object, according to the display device of the present invention, the display unit in which the orientation of the display surface is variable with respect to the base, and the luminance for controlling the display luminance of the display unit are defined. A display unit having a light receiving unit on a rear surface of the display surface of the display unit, and detecting a light amount incident on the light receiving unit; A light receiving portion on the same surface as the display surface, and a second detecting means for detecting the amount of light incident on the light receiving portion, wherein the brightness control means includes the first and the second The luminance of the display unit is controlled based on the detection result of the detection unit.

  According to a sixth aspect of the present invention, there is provided an optical apparatus according to a sixth aspect of the present invention, an imaging unit that images a subject, a third detection unit that detects a light amount of the subject using an optical system of the imaging unit, and a display. Display means whose surface orientation is variable with respect to the optical axis of the optical system of the imaging means, brightness control means for controlling the display brightness of the display means, and a light receiving unit on the back surface of the display surface of the display means A first detecting means for detecting the amount of light incident on the light receiving portion; and a light receiving portion on the same surface as the display surface of the display means for detecting the amount of light incident on the light receiving portion. And the brightness control means detects the detection results of the second and third detection means when the light receiving portion of the first detection means is shielded by another member. And controlling the brightness of the display means, and the light receiving portion of the first detecting means If not blocked by the member, and controlling the brightness of the display means based on a detection result of the first and third detecting means.

  By detecting the ambient brightness with the illuminance sensors provided on the back surface and the display surface of the display unit, it is possible to control the brightness with high accuracy.

The block diagram which shows the electric system of 1st Embodiment The figure which shows the external appearance of the digital camera of 1st Embodiment The flowchart figure of the liquid-crystal luminance control process of 1st Embodiment The flowchart figure of the brightness decision process of 1st Embodiment. The flowchart figure of the weighting process of 1st Embodiment The flowchart figure of the brightness decision processing of 2nd Embodiment. The flowchart figure of the weighting process of 2nd Embodiment The flowchart figure of the liquid-crystal luminance control process of 3rd Embodiment The flowchart figure of the weighting process of 3rd Embodiment

(First embodiment)
In the first embodiment, an illuminance sensor is provided in the vicinity of the display surface of the liquid crystal display unit and the back surface thereof, and ambient brightness is detected by these two illuminance sensors.

  Furthermore, in the present embodiment, when the liquid crystal display unit is housed in the back of the camera, one illuminance sensor cannot obtain an appropriate output, and therefore illuminance measurement is performed using the AE information of the camera.

  FIG. 1 shows a configuration of a digital camera as an example of a display control apparatus applicable to the present embodiment. Reference numeral 7 denotes a microcomputer that performs overall control (hereinafter abbreviated as “microcomputer”: control means), 1 denotes an imaging unit composed of a CCD or CMOS area sensor, and 2 denotes an image processing unit that processes an image signal from the imaging unit 1. is there. An image display unit 8 displays an image from the image processing unit 2 on the display unit, and an external storage unit 3 includes a non-volatile storage member that stores a plurality of image data.

  The imaging unit 1 forms an image of the light flux from the imaging region on the imaging device through the optical system of the lens 5, and the imaging device photoelectrically converts this and outputs it to the image processing unit 2 as an electrical signal. In the present embodiment, the imaging unit 1 and the lens 5 are collectively used as an imaging unit.

  The image processing unit 2 has an A / D conversion function, and after A / D converting the signal from the imaging unit 1, performs a series of corrections caused by the imaging unit 1 such as dark current correction and shading correction. 2. Further, a noise component is removed by a low-pass filter, and a series of image processing relating to so-called picture creation such as pixel and color interpolation processing, white balance and gamma correction is performed.

  The external storage device 3 is a non-volatile storage member that can store a plurality of image data, such as a CF card and an SD card, and is detachable from the system. In other words, the image data output from the image processing unit 2 in the state of being mounted on the system is stored, and after performing this for one or a plurality of shooting screens, it can be removed from the system. The stored image data can be played back, edited, and stored by being mounted on another system that can be read in the data format of this system. If the image data can be read in the data format of this system by being mounted again, the image processing unit 2 can perform optimum processing after reading and display on the image display unit 8. .

  The photometric sensor 4 detects the brightness of the speed of light incident on the lens 5 and sends the detection result to the microcomputer 7. A subject at the time of shooting and the amount of light from the surroundings are irradiated through a lens mounted on the camera. The camera establishes the relationship between ISO sensitivity, shutter speed TV, and aperture AV based on the output of the photometric sensor 4. When this relationship is established, it is possible to shoot with optimum brightness.

The output of the photometric sensor 4 is output as an EV (Exposure Value) (= Light Value) value, and the following relationship is established.
EV = log2 (F ^ 2 / T)
F: Lens aperture (AV)
T: Exposure time (seconds) (TV)
This EV value is a value determined by the lens aperture (F) and the exposure time (T), and ISO determined by the sensitivity correction of the image sensor is added. Conversion from EV value to illuminance can be obtained by a known relational expression.

  The focus detection unit 6 includes a field sensor such as a field lens, a reflection mirror, a secondary imaging lens, an aperture, and a line sensor such as a CCD including a plurality of photoelectric conversion elements arranged in the vicinity of the imaging surface. The focus detection unit in this embodiment is a well-known phase difference method, and is configured so that a plurality of areas in the observation screen (in the viewfinder field) can be used as focus points, and the focus detection points can be detected. there. The lens 5 incorporates a focus adjustment circuit and a diaphragm drive circuit, and transmits signals to and from the microcomputer 7 via a mount contact (not shown). Based on the output from the focus detection unit 6, the microcomputer 7 operates a focus adjustment circuit built in the photographing lens 5 and outputs a signal for optimum focus adjustment. Further, based on the output according to the brightness obtained from the photometric sensor 4, the aperture driving circuit built in the lens 5 is operated to output a signal with an optimum exposure amount.

  The microcomputer 7 is, for example, a one-chip computer in which a CPU (Central Processing Unit), RAM, ROM, nonvolatile memory, input / output port, and the like are arranged. The microcomputer 7 performs a series of operations based on a sequence program stored in the ROM. The non-volatile memory built in the microcomputer 7 captures the image display unit 8 from a series of camera control parameters including adjustment values for exposure control and focus adjustment, image sensor adjustment values, and white balance of the captured image. Stores control values for displaying images.

  The image display unit 8 outputs the captured image data from the imaging unit 1 subjected to the image processing and the captured image data recorded in the external storage device 3 after performing a series of processes for display.

  The image processing unit 2 that performs a series of processes for output to the image display unit 8 includes a white balance (WB) adjustment unit, a resizing unit, and a VRAM unit (all not shown). The white balance (WB) adjustment unit adjusts the white balance (WB) of the display image based on the region extraction and the output from the average luminance detection unit. After that, the resizing unit converts the resolution to a resolution that can be displayed on the liquid crystal display unit, and then temporarily stores it in the VRAM unit and outputs it to the image display unit 8.

  The image display unit 8 is a movable display unit in which a liquid crystal control unit 9, a liquid crystal display unit 11, and a backlight 10 are configured. As shown in FIG. 2, the entire image display unit 8 is connected to the main body (base portion) through a connecting portion such as a hinge, and can be rotated independently in the horizontal direction and the vertical direction (top and bottom direction) with the connecting portion as an axis. It is attached to. As a result, the orientation of the display surface of the liquid crystal display unit 11 is variable with respect to the base, and the user can check the screen in various postures and check the captured or reproduced image. The configuration for moving the image display unit 8 is not limited to the configuration of the present embodiment, and the present invention can be applied. Further, the present invention is not limited to the degree of freedom in the left and right and top and bottom directions that are movable in the present embodiment, and the present invention can be applied as long as the display surface has a variable orientation relative to the base. In the optical apparatus such as a camera exemplified in the present embodiment, in particular, in the case where the orientation of the display surface is variable with respect to the optical axis of the optical system of the imaging unit, for more suitable luminance control, The configuration of the present invention is effective. The liquid crystal control unit 9 includes a signal processing unit for optimizing the liquid crystal display image and a liquid crystal driver unit for driving the liquid crystal display. The liquid crystal control unit 9 includes a white balance (WB) adjustment unit, a contrast adjustment unit, a γ correction unit, a DA conversion unit, etc., and receives an output from the image processing unit 2 to perform a series of signal processing. Thereafter, the signal is converted into a signal format to be output to the liquid crystal display unit 11. The liquid crystal driver unit outputs a signal for driving the liquid crystal display unit 11 in synchronization with the image data DA-converted by the DA conversion unit. The liquid crystal display unit 11 is an electro-optical unit composed of a transmissive liquid crystal display panel, and here, a TFT type liquid crystal is used.

  The display content of the liquid crystal display unit 11 can be visually recognized by the illumination of the backlight 10. The brightness of the liquid crystal display image changes according to the brightness of the backlight 10. The image data displayed on the liquid crystal display unit 11 includes image data stored in the external storage device 3 and camera setting information in addition to the image data from the imaging unit 1 described above.

  In the present embodiment, the backlight 10 is composed of a plurality of LEDs and an optical member. The LED drive control is performed by a constant current and on / off control by a PWM control signal from the microcomputer 7, and the lighting brightness is varied by changing its duty ratio, but full on is also possible. Always on. At this time, the backlight luminance is maximized.

  In the present embodiment, two illuminance sensors are provided to detect the brightness around the image display unit 8. As shown in an external view shown in FIG. 2 to be described later, one is a first illuminance sensor 12 (first detection means) installed on the back surface of the display surface of the image display unit, and the other is an image display. It is the 2nd illumination intensity sensor 13 (2nd detection means) installed on the same surface as the display surface of a part. The outputs of the first and second illuminance sensors 12 and 13 are connected to the AD conversion unit of the microcomputer 7. In either case, the light transmitted through the light receiving window is incident and the output is proportional to the amount of light.

The relationship between ambient brightness and the output of the first or second illuminance sensor is expressed by the following equation.
Ambient brightness (illuminance) = illuminance sensor output / (sensor sensitivity x light-receiving window transmittance)
In the present embodiment, it is assumed that brightness of 10 Lx to 20,000 Lx can be measured using the first or second illuminance sensors 12 and 13. This measurement range sufficiently covers the range of brightness that can be varied in the transmissive liquid crystal. The microcomputer 7 uses the AD conversion result to calculate the brightness from the above relational expression.

  An operation member and a display unit of the camera will be described with reference to FIG. FIG. 2 is an external view of a digital camera to which the present invention is applied as seen from the back. The display unit mounted on the back of the camera is called the “vari-angle” system. It can be opened and closed and the display surface can be rotated according to the user's operation. Or angle.

  FIG. 2A shows a so-called storage state in which the liquid crystal display unit 11 faces the front of the camera and the user can see the back of the display. FIG. 2B shows a state in which a display operation is possible, and an image and a screen for camera setting are displayed on the liquid crystal display unit 11 when necessary.

  FIG. 2 (c) shows a state in which the image display unit 8 is operated so that the position is substantially the same as that of the fixed display unit, and a display operation is possible. At this time, the image display unit 8 is rotated 180 ° in the vertical direction from the state of FIG. 2B and further rotated in the horizontal direction. As a matter of course, the top and the left and right directions of the display device are reversed from those in FIG. 2B, but the camera performs processing so that there is no difference in display contents.

  The first illuminance sensor 12, which is a characteristic part of the present invention, is provided on the back surface of the liquid crystal display unit 11. When the liquid crystal display unit 11 is mainly watched, the display unit out of the brightness around the camera. The amount of light incident on the peripheral and user peripheral visual fields is detected. The first illuminance sensor 12 has a light receiving unit and an illuminance sensor main body assembled therein, and light transmitted through the light receiving unit is irradiated onto the illuminance sensor main body. In the state shown in FIG. 2A, since the liquid crystal display unit 11 itself is housed in the storage unit on the back of the camera, there is no need to measure ambient brightness.

  As shown in FIG. 2B, the second illuminance sensor 13 is provided in the vicinity of the display surface of the liquid crystal display unit 11, and mainly when looking at the liquid crystal display unit 11, Of the brightness, the amount of light that enters from behind the user and is reflected by the display surface is detected. The second illuminance sensor 13 also includes a light receiving unit and an internal illuminance sensor main body, and light transmitted through the light receiving unit is irradiated onto the illuminance sensor main body.

  The state of the liquid crystal display unit 11 shown in FIG. 2B is a usage method that takes advantage of the superiority of a camera having a vari-angle image display unit as in this embodiment. At this time, in the present embodiment, the first illuminance sensor 12 is installed on the back surface of the liquid crystal display unit 11, so that the amount of light incident from the user's gaze direction can always be detected. Thereby, it is possible to always adjust the illuminance appropriately even for the vari-angle liquid crystal.

  In FIG. 2C, since the first illuminance sensor 12 is shielded by the camera body which is another member, ambient brightness cannot be measured appropriately using the detection result. At this time, in this embodiment, the accuracy of illuminance detection is supplemented by obtaining the brightness from the AE information of the camera or the brightness information based on the captured image (details will be described later). The content detected by the second illuminance sensor 13 is the same as in FIG.

  Next, the brightness setting of the liquid crystal display unit of the camera will be described with reference to FIGS. FIG. 3 is a flowchart of liquid crystal automatic brightness control processing from turning on to turning off the image display unit 8. This process is started with the use of the liquid crystal display unit 11 as a trigger, such as when the power is turned on, when the liquid crystal display unit 11 starts to be used, or when the liquid crystal display unit 11 is returned from the stored state. Processing is performed in each unit according to instructions from the microcomputer 7. The brightness of the image display unit 8 is determined by the “γ” process for the liquid crystal display unit 11 and the backlight 10 controlled by the microcomputer 7.

  In S301 and S303, the camera storage state of the liquid crystal display unit 11 is determined.

  As shown in FIG. 2B, the display state 1 in the figure indicates a state in which the image display unit 8 freely adjusts the left and right sides and the top and bottom in accordance with the usage state of the user. At this time, the first illuminance sensor 12 can detect the illuminance in the gaze direction when the user gazes at the liquid crystal display unit 11. Therefore, in the display state 1, the information of the first illuminance sensor is fetched and used as the brightness information in the display unit rear surface direction (S302).

  The display state 2 in the figure refers to the state of FIG. 2C. At this time, since the first illuminance sensor 12 is in the retracted state, it cannot be used, but the rear surface direction of the image display unit is just the imaging optical system of the camera. This corresponds to the optical axis direction. Accordingly, in S303, it is determined whether or not the display state is 2, and in the case of the display state 2, the photometric information of the photometric sensor 4 (third detection means) at the time of imaging is taken in (S304), and the brightness in the direction of the back surface of the display unit Information is calculated (S306).

  As described above, after the brightness information in the rear surface direction of the display unit is captured by the first illuminance sensor 12 or the photometric sensor 4, the information of the second illuminance sensor 13 is captured (S306). Then, the ambient brightness is obtained by using these two sensor information, and the liquid crystal luminance suitable for it is determined (S308). The brightness determination process in S308 will be described in detail later.

  Since the brightness of the liquid crystal at the time of display has been determined, the backlight drive condition: PWM duty ratio and γ of the image to be displayed are obtained from the table data prepared in advance so as to obtain the brightness, and are reflected in the brightness of the liquid crystal (S309). ). These contents are repeated until the lights are turned off (S310). There are a function of automatically turning off after a predetermined time elapses and a time of user switch operation. The liquid crystal brightness automatic control can be turned on / off by a user's switch operation, and these processes are not performed when the liquid crystal brightness automatic control is turned off.

  When the display state is not 2 in S303, the image display unit 8 is stored as shown in FIG. 2A and the liquid crystal display unit 11 is hidden. At this time, the display is turned off (S310), and the process is performed. to end the.

  FIG. 4 shows the flow of the operation of the brightness determination process shown in S308 of FIG. The difference between the display surface illuminance and the display back surface illuminance is obtained from the first and second illuminance sensors 12 and 13 provided on the front and back surfaces of the liquid crystal display unit 11, respectively, and the ambient illuminance is calculated based on the difference value.

  First, the difference Δ between the brightness information obtained by the first illuminance sensor 12 or the photometric sensor 4 and the brightness information obtained by the second illuminance sensor 13 is obtained (S401). Δ is represented by Δ = Ef−Eb, where Ef is the display surface illuminance and Eb is the display back surface illuminance. At this time, for each of the brightness information by the illuminance sensor and the brightness information by the photometric sensor 4, unit sharing is first performed if necessary. For unit sharing, the illuminance Lx is calculated from the output of the illuminance sensor, and the photometric sensor information is converted to the illuminance Lx using the conversion formula that is normally used if the output of the photometric sensor 4 generally used in the camera is an EV value. to. When the photometry information is held as an AE value, the illuminance LX is converted from the ISO sensitivity, TV value, and AV value using a conversion formula that is normally used.

  Next, the evaluation value β of Δ is obtained using the result obtained in S401 (S402). Details will be described with reference to FIG.

In S403, ambient illuminance is calculated. More precisely, it is an estimated value of the illuminance around the display surface in consideration of the user's gaze direction and the like for use in adjusting the luminance of the liquid crystal display unit 11. In the present embodiment, in addition to the conventional illuminance in the display surface direction (display surface illuminance), the illuminance in the display back surface direction (display back surface illuminance) can be newly obtained for the liquid crystal display unit 11. When obtaining the ambient illuminance from these two illuminances, there are two methods: a method that takes into account the effect of the display back surface illuminance on the basis of the display surface illuminance, and a method that takes into account the effect of the display surface illuminance on the basis of the display back surface illuminance. That is, calculation is performed by adding a correction value based on the illuminance of the other using either illuminance as a reference. In either case, it is possible to calculate the ambient illuminance more accurately than the conventional method in which only the illuminance on the display surface is the ambient illuminance, but the liquid crystal display unit 11 can be calculated more by using the illuminance in the display back surface direction as a reference direction of the user. It is possible to realize the calculation of the ambient illuminance for adjusting the luminance suitable for the user. Therefore, in the present embodiment, adjustment is performed with a weighted value by multiplying the difference Δ between the display surface illuminance and the display back surface illuminance by the weighting coefficient β on the basis of the display back surface illuminance by the second illuminance sensor 13. That is, if the illuminance around the display surface is Es,
Es = Eb + | Δ | × β
To calculate the ambient illuminance. By the way, when the ambient illuminance is calculated based on the display surface illuminance, the display back surface illuminance in the above equation may be replaced with the display surface illuminance. That is,
Es = Ef + | Δ | × β
It becomes.

  In S404, the liquid crystal brightness suitable for the ambient illuminance determined in S403 is set. In the present embodiment, the relationship between the ambient illuminance and the liquid crystal luminance suitable for the ambient illuminance is obtained from table data prepared in advance, but may be obtained by a predetermined arithmetic expression representing the relationship between the two.

  FIG. 5 is a flowchart of the determination process (S403) of the evaluation value β of Δ in FIG. β is a value that determines the weighting to Δ in the above-described calculation formula of ambient illuminance, and 0 ≦ β ≦ 1. The brightness information in the display back surface direction from either the first illuminance sensor 12 or the photometric sensor 4 is compared with the brightness information in the display surface direction by the second illuminance sensor 13 to obtain β.

  First, it is determined whether or not Δ obtained in S402 in FIG. 4 is positive (S501). If Δ> 0, β is set to 1 (S502), and if Δ ≦ 0, β is set to 0. 5 (S503). That is, when viewed from the user, when the brightness in the display surface direction is a front light state larger than the brightness in the display back surface direction, Δ is increased compared to the backlight state in the reverse relationship, The contribution of Δ is increased compared to the backlight state. In this embodiment, β = 1 is set in the following light state (Δ> 0), and β = 0.5 is set in the back light state (Δ ≦ 0). However, the present invention is not limited to this. If the magnitude relation of β is as described above, each value of β can be set as appropriate.

  As described above, in this embodiment, an illuminance sensor is provided on the display surface and the display back surface of the vari-angle image display unit, so that the user can use the image display unit in any state (angle). , Suitable brightness adjustment can be performed. Further, in the present embodiment, the brightness information in the direction of the back surface of the liquid crystal display is selected from the illuminance sensor provided on the display back surface and the photometric information by the imaging optical system depending on the state of the image display unit. It is way. Accordingly, even when the display back surface is hidden (in the storage state), appropriate brightness adjustment can be performed.

  Furthermore, based on the two brightness information of the display surface direction and the display back surface direction, it is determined whether the user is viewing the liquid crystal display part in the normal light state or the backlight state, and this is reflected in the calculation of ambient brightness. make. As a result, the two pieces of information are effectively reflected in the luminance adjustment, thereby realizing a more suitable luminance adjustment.

(Second Embodiment)
In the present embodiment, the reliability of the display back surface illuminance is further considered in calculating the ambient illuminance as shown in the first embodiment.

  FIG. 6 shows the flow of the operation of the brightness determination process shown in S308 of FIG. As shown in the figure, a determination process for determining the weighting coefficient α based on the reliability of the display back surface illuminance is inserted in S601 as compared with the brightness determination process (FIG. 4) in the first embodiment. Details of the α determination process will be described with reference to FIG.

  FIG. 7 shows the processing contents of the determination processing (S601) of the weighting coefficient α in FIG. Here, the brightness information in the back surface direction (display back surface direction) of the liquid crystal display unit 11 by the first illuminance sensor 12 or the photometric sensor 4 and the weighting coefficient α corresponding to the reliability of the display back surface illuminance are obtained. First, it is determined whether or not the image display unit 8 is in display state 1 (S701). When the image display unit 8 is in the display state 1 (FIG. 2B), the first illuminance sensor 12 measures the amount of light incident on the light receiving unit in real time. The weighting coefficient α may always be 1 (S703). When the image display unit 8 is not in the display state 1 but in the display state 2 (FIG. 2C), as described above, the brightness information in front of the camera in the display back surface direction is based on the photometric information of the photometric sensor 4 of the camera. obtain. At this time, since the photometric information is obtained at the time of normal photographing, the reliability is evaluated according to the degree of lapse of time from the acquisition of the photometric information to the present, and the weighting coefficient α is obtained.

  That is, when the display state is not 1, since it is determined that the display state 2 is considered in consideration of the main processing, it is determined that the currently obtained display back surface illumination is based on the photometric information. Therefore, from here, the degree of aging of the obtained photometric information is determined. First, it is determined whether or not the display mode is quick review (S702). Quick review is displayed immediately so that the user can check the image just taken immediately after shooting, and in the case of quick review, it is displayed immediately after shooting. The coefficient α is set to 1 (S703). When it is not a quick review, that is, when an image is displayed or a menu screen is displayed in accordance with an operation of a playback display button or the like, the degree of passage of time is set as a determination condition (S704). When the elapsed time from the last shooting is smaller than the predetermined value, the weighting coefficient α is set to 0.5 (S705). When it is larger than the predetermined value, the weighting coefficient α is set to 0 (S706). As described above, in this embodiment, the determination of the degree of lapse of time from the previous shooting other than the quick review, that is, the photometric information acquisition time, is made with two choices of less than a predetermined value and more than a predetermined value. Alternatively, α may be determined stepwise depending on the degree of aging. In this case, the value of α may be set to become a large value that approaches 1 as time passes.

The calculation formula of the ambient illuminance in S403 of FIG. 6 is also defined in consideration of the reliability of the display back surface illuminance. That is, the ambient illuminance in the present embodiment is Es = α × Eb + (1−α) × Ef + | Δ | × α × β
It is represented by Thus, the weighting coefficient α is a weighting coefficient used for the weighted average of the display surface illuminance and the display back surface illuminance. The ratio of the illuminance as a reference is weighted and averaged by α: 1−α by the display back surface illuminance and the display surface illuminance, and at the same time, α is reflected in the calculation including Δ to which the value of the display back surface illuminance also contributes. When the reliability of the display back surface illuminance is high and α = 1, the same formula as the first embodiment based on the display back surface illuminance can be obtained. Conversely, when the display back surface illuminance is not reliable and α = 0, the ambient illuminance is equal to the display surface illuminance, and the ambient illuminance is calculated using only the information on the display surface illuminance. Avoid cases where the accuracy will be reduced.

  As described above, in the present embodiment, in addition to the effects obtained in the first embodiment, the reliability of the display back surface illuminance is taken into consideration, so that more accurate calculation of the ambient illuminance and thereby more preferable brightness adjustment of the display unit. It is realized.

(Third embodiment)
The first and second embodiments relate to menu screen display, acquisition of brightness information for determining display brightness when a captured image is reproduced and displayed, and brightness control of the display unit based on the acquisition. It was. In the present embodiment, a luminance adjustment process in consideration of luminance adjustment in the real-time display mode when the imaging apparatus main body has a function of a real-time display mode for displaying the output of the imaging unit on the image display unit in real time is shown. In addition to a single-lens reflex camera equipped with a separate photometric sensor, an optical device equipped with a real-time display mode may be a camera that does not include a separate photometric sensor and obtains photometric information only from an image sensor, that is, an electronic view. A camera or video camera with only a viewfinder. Of course, the optical apparatus to which the present invention can be applied is not limited to this. In an optical apparatus having a real-time display mode, photometric information can always be obtained in real time from photographing information obtained from an image sensor regardless of the presence or absence of photometric information by a photometric sensor. Therefore, brightness information (display back surface illuminance) in the display back surface direction can be calculated from the photographing information instead of the photometric information. In the present embodiment, a single-lens reflex camera having both a photometric sensor and a real-time display mode will be mainly described.

  FIG. 8 is obtained by adding the processing of S801, S802, and S803 to FIG. Only the difference will be described here.

  When the image display unit 8 is in the display state 2, it is next determined whether or not the image display mode is the real-time display mode (S801). When it is in the real-time display mode, photographing information is captured (S802), and brightness information in the display back surface direction is calculated (S803). If it is not the real-time display mode, the process proceeds in the same manner as in the first or second embodiment.

  8 is the same as that in FIG. 3 except for the process of determining the brightness in S307, but the weighting coefficient α determination process is different from that in the second embodiment.

  FIG. 9 is a flowchart of the weighting coefficient α determination process. In FIG. 9, the correspondence in the real-time display mode (S901) is incorporated in FIG. That is, in the real-time display mode, the weighting coefficient α = 1 is set. In other cases, the processing is performed in the same manner as in the second embodiment shown in FIG. In the present embodiment, the optical device including the real-time display mode and the photometric sensor is described. However, when the photometric sensor is not provided, the photometric information cannot be acquired even when the first illuminance sensor 12 is in the housed state. . Therefore, when not in the real-time display mode, the ambient illuminance may be calculated using only the display surface illuminance. As described above, in the present embodiment, in addition to the situation of the first or second embodiment, the shooting information obtained in real time in the real time display mode in the situation such as the display state 2 (FIG. 2C) is obtained. The brightness information (display back surface illuminance) in the display back surface direction is detected. Thereby, it is possible to realize a more suitable brightness adjustment of the liquid crystal display unit regardless of the storage state of the image display unit.

(Modification)
The present invention is not limited to a digital camera, and can be applied to any display unit such as an optical device other than a camera or another device that can change brightness. Further, the present invention is not limited to a liquid crystal display, and any display having a display function can be applied. For example, a display using an organic EL may be used. Since the organic EL is a self-luminous element, unlike the transmissive liquid crystal in the embodiment, the brightness of the light emitting unit for display is not controlled by the backlight, but the brightness of the light emitting unit for display.

DESCRIPTION OF SYMBOLS 1 Image pick-up part 4 Photometric sensor 7 Microcomputer 8 Image display part 9 Liquid crystal control part 11 Liquid crystal display part 12 1st illumination intensity sensor 13 2nd illumination intensity sensor

Claims (14)

Display means in which the orientation of the display surface is variable relative to the base;
A brightness control means for controlling the brightness of display of the display means,
A first detection unit having a light receiving unit on a back surface of the display surface of the display unit, and detecting a light amount incident on the light receiving unit;
A light receiving portion on the same surface as the display surface of the display means, and a second detection means for detecting the amount of light incident on the light receiving portion,
The display apparatus according to claim 1, wherein the brightness control means controls the brightness of the display means based on detection results of the first and second detection means.   The brightness control means determines the brightness of the display means using a value obtained by adding a correction value based on the detection result of one of the first and second detection means to the detection result of the other. The display device according to claim 1.   The luminance control unit multiplies the difference between the detection result of the first detection unit, the detection result of the second detection unit, and the detection result of the first detection unit by a weighting coefficient based on the value of the difference. 3. The display device according to claim 1, wherein the illuminance around the display surface of the display unit is estimated using a value obtained by adding the calculated value to the display value.   The luminance control unit multiplies the difference between the detection result of the second detection unit and the detection result of the first detection unit and the detection result of the second detection unit by a weighting coefficient based on the value of the difference. The display device according to claim 1, wherein the illuminance around the display surface of the display unit is estimated using a value obtained by adding the calculated value.   The display device according to claim 3 or 4, wherein when the difference value is positive, the value of the weighting coefficient is larger than when the difference value is negative. A display device according to any one of claims 1 to 5;
Having imaging means for imaging a subject;
An optical apparatus characterized in that the orientation of the display surface of the display means is variable with respect to the optical axis of the optical system of the imaging means. Imaging means for imaging a subject;
Third detection means for detecting the amount of light of the subject using an optical system of the imaging means;
Display means in which the orientation of the display surface is variable with respect to the optical axis of the optical system of the imaging means;
Brightness control means for controlling the display brightness of the display means;
A first detection unit having a light receiving unit on a back surface of the display surface of the display unit, and detecting a light amount incident on the light receiving unit;
A light receiving portion on the same surface as the display surface of the display means, and a second detection means for detecting the amount of light incident on the light receiving portion,
The brightness control means includes
When the light receiving portion of the first detection means is shielded by another member, the brightness of the display means is controlled based on the detection results of the second and third detection means,
When the light receiving part of the first detection means is not shielded by other members,
An optical apparatus characterized in that the brightness of the display means is controlled based on detection results of the first and third detection means.   The optical apparatus according to claim 6, wherein the luminance control unit does not perform luminance control of the display unit when the display unit is in a retracted state.   The luminance control unit multiplies the difference between the detection result of the first detection unit, the detection result of the second detection unit, and the detection result of the first detection unit by a weighting coefficient based on the value of the difference. The optical apparatus according to claim 6, wherein the illuminance around the display surface of the display unit is estimated using a value obtained by adding the calculated values.   The luminance control unit multiplies the difference between the detection result of the second detection unit and the detection result of the first detection unit and the detection result of the second detection unit by a weighting coefficient based on the value of the difference. The optical apparatus according to claim 6, wherein the illuminance around the display surface of the display unit is estimated using a value obtained by adding the calculated value.   The luminance control means is a weighted average of the detection result of the first or third detection means and the detection result of the second detection means, the detection result of the second detection means, and the first A value obtained by multiplying the difference between the detection result of the detection means and the weighting coefficient based on the value of the difference and the weighting coefficient used in the weighted average is added to the periphery of the display surface of the display means. The optical apparatus according to claim 6, wherein the illuminance is estimated.   11. The weighting coefficient value based on the difference is larger when the difference value is positive than when the difference value is negative. 11. optical equipment.   The weighting coefficient used in the weighted average is large when the time elapsed from the acquisition of the detection result of the first or third detection means used for estimating the illuminance around the display surface is small. The optical apparatus according to claim 10, wherein the optical apparatus has a larger value than the case. When the display means is a real-time display mode for displaying the image from the imaging means in real time,
The optical apparatus according to claim 6, wherein photographing information obtained from the imaging unit is used instead of the detection result of the third detection unit.

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