JP2009037031A - Display device and camera equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device where display of a range-finding area within a finder is easy-to-view. <P>SOLUTION: The display device (1) is equipped with: range-finding area display means (72, 74 and 111) superposing and displaying selected range-finding area display (200a) showing the position of a selected range-finding area, out of a plurality of range-finding areas, on a subject image with prescribed luminance within the field of view (57a) of the finder (57) in a camera (100) which can be focused on the selected range-finding area; a photometry means (112) metering the luminance of the subject image in a first area in which the selected range-finding area display (200a) is included, and the luminance of the subject image in a remaining area other than the first area in the field of view (57a); and luminance control means (74 and 111) determining the display luminance of the selected range-finding area display (200a) according to the luminance of the subject image in the first area and the luminance of the subject image in the remaining area. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device and a camera including the display device.

Conventionally, there is a camera that can focus on a selected ranging area among a plurality of ranging areas. In such a camera, a superimpose method has been proposed in which a ranging area display indicating the position of a selected ranging area is displayed on the subject image in the viewfinder field of view (see, for example, Patent Document 1). ). In this superimposing method, the area in the viewfinder field is divided into multiple areas to prevent the area display from becoming invisible due to the brightness of the subject image that overlaps the area display. The brightness of the subject in the area including the distance measurement area display is detected, and the display brightness of the distance measurement area display is controlled according to the brightness of the subject.
Japanese Patent Laid-Open No. 3-65939

  However, if there are black low-reflectance objects or high-luminance objects in other areas other than the area that includes the selected ranging area display, the photographer will be affected by those objects. This may make it difficult to see the ranging area display.

  An object of the present invention is to make it easy to see the distance measurement area display in the viewfinder.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

According to the first aspect of the present invention, in the field of view (57a) of the finder (57), a selected distance measuring area display (indicated by a distance measuring area selected for focusing among the plurality of distance measuring areas) is displayed. 200a) is displayed on the subject image with a predetermined luminance and is displayed in a first area including distance measuring area display means (72, 111) and the selected distance measuring area display (200a) in the field of view (57a). A metering means (112) for metering the brightness of the image and the brightness of the subject image in a region other than the first region; and the selection based on the brightness of the subject image in the first region and the brightness of the subject image in the other region. A display device (1) comprising: luminance control means (74, 111) for controlling the display luminance of the distance measurement area display (200a).
The invention according to claim 2 is the display device (1) according to claim 1, wherein the other region is a region adjacent to the first region. is there.
The invention according to claim 3 is the display device (1) according to claim 2, wherein the first region and the other region have portions overlapping each other. It is.
A fourth aspect of the present invention is the display device (1) according to any one of the first to third aspects, wherein the luminance control means (74, 111) is configured to detect a subject image in the first area. Correction is performed on the reference value (EV0) corresponding to the luminance based on the difference (ΔEV) between the comparison value (EVn) corresponding to the luminance of the subject image in the other region and the reference value (EV0). The display device (1) is characterized in that the display brightness of the selected ranging area display (200a) is controlled based on a later value (EVcor).
Invention of Claim 5 is a display apparatus (1) of any one of Claims 1-4, Comprising: The said brightness | luminance control means (74,111) is the said value from the said comparison value (EVn). The maximum value (ΔEVmax) obtained by subtracting the reference value (EV0) is larger than the first threshold (EVth1), and the minimum value (ΔEVmin) obtained by subtracting the reference value (EV0) from the comparison value (EVn) is: When the second threshold value (EVth2) is smaller than the first threshold value (EVth1), a positive correction value (EVadj) is added to the reference value (EV0), and the selected measurement is performed based on the corrected value (EVcor). The display device (1) is characterized by controlling the display brightness of the distance area display (200a).
Invention of Claim 6 is a display apparatus (1) of any one of Claims 1-5, Comprising: The said brightness | luminance control means (74,111) is the said value from the said comparison value (EVn). The maximum value (ΔEVmax) obtained by subtracting the reference value (EV0) is smaller than the first threshold (EVth1), and the minimum value (ΔEVmin) obtained by subtracting the reference value (EV0) from the comparison value (EVn) is: When smaller than the second threshold (EVth2) smaller than the first threshold (EVth1), a negative correction value (EVadj) is added to the reference value (EV0), and the selected measurement is performed based on the corrected value (EVcor). The display device (1) is characterized by controlling the display brightness of the distance area display (200a).
The invention according to claim 7 is the display device (1) according to claim 5 or 6, wherein the correction value (EVadj) is obtained by subtracting the reference value (EV0) from the comparison value (EVn). The display device (1) is characterized by increasing as the absolute value of the value increases.
The invention according to claim 8 is the display device (1) according to claim 7, wherein an upper limit is provided for an absolute value of the correction value (EVadj). ).
The display device (1) according to claim 9 is the display device (1) according to claim 8,
The distance measuring area display means (72, 111) transmits the light to the portion of the selected distance measuring area display (200a) out of a plurality of distance measuring area displays (200), thereby displaying the selected distance measuring area display. (200a) within the finder (57) field of view (57a) has a shutter function, and the positive upper limit value among the upper limit values is displayed by the plurality of distance measuring area displays (200 ) Is determined so as to reduce the display of the ranging area display (200) other than the selected ranging area display (200a) in the visual field (57a). 1).
A tenth aspect of the present invention is a camera (100) including the display device (1) according to any one of the first to ninth aspects.
Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  According to the present invention, it is possible to make the distance measurement area display in the viewfinder easier to see.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a camera 100 including a display device 1 according to an embodiment of the present invention. In FIG. 1, an xyz orthogonal coordinate system is provided for ease of explanation and understanding. In this coordinate system, the direction toward the left side when viewed from the photographer at the position of the camera 100 (hereinafter referred to as a normal photographing position) when the photographer shoots a horizontally long image with the optical axis L being horizontal is referred to as an x plus direction. To do. In addition, a direction toward the upper side at a normal photographing position is a y plus direction. Furthermore, the direction toward the subject at the normal shooting position is the z plus direction.

  The camera 100 is an interchangeable lens digital camera, and includes a photographing lens 10, a mirror unit 20, and an imaging unit 30 along the optical axis L. Further, out of the light incident on the photographing lens 10, the focus detection unit 40 in which the light directed downward in the figure by the mirror unit 20 enters, and the finder in which the light directed upward in the figure by the mirror unit 20 enters. Part 50.

  The taking lens 10 is a lens that can be exchanged for the camera body 100 a and includes a diaphragm 11. The mirror unit 20 is disposed on the exit side of the taking lens 10 and includes a main mirror 21 and a sub mirror 22. The main mirror 21 reflects the light that has passed through the photographing lens 10 toward the viewfinder unit 50. A part of the main mirror 21 is a half mirror, and transmits a part of the light. Further, when a release button (not shown) is pressed during shooting, the main mirror 21 retracts to a mirror-up position where the reflecting surface is substantially parallel to the optical axis L. The sub mirror 22 bends the path of light transmitted through the half mirror portion of the main mirror 21 and reflects the light to the focus detection unit 40.

  The imaging unit 30 includes a shutter 31, an LPF (Low-Pass Filter) 32, and an imaging element 33. The shutter 31 has a shutter speed controlled by a signal from the MCU 101 described later. The image sensor 33 is a CCD, CMOS, or the like that converts an image formed by the photographing lens 10 into an electrical signal. A substrate 34 is disposed at the rear of the image sensor 33, and an MCU 101 that performs overall control of the camera 100 and various circuits described later are disposed on the substrate 34. Further, a rear liquid crystal monitor 35 is disposed on the back side of the photographer side of the camera 100 main body.

  A focus detection sensor 41 is disposed in the focus detection unit 40, and the light branched from the main mirror 21 is reflected by the sub mirror 22 and is incident on the focus detection sensor 41. In front of the focus detection sensor 41, a lens driving device 42 including a motor, a coupling gear, and a coupling is disposed.

  The viewfinder unit 50 includes a focusing screen 51, a diffusing liquid crystal 52, a pentaprism 53, a first dichroic prism 54, a second dichroic prism 55, and an eyepiece lens 56.

  The subject light that has passed through the photographing lens 10 is reflected in the y-plus direction in FIG. 1 by the main mirror 21 and once formed on the focusing screen 51. The subject light imaged on the focusing screen 51 is transmitted through a diffusing liquid crystal 52 for cropping during high-speed shooting, and the first dichroic prism 54 and the first dichroic prism 54 bonded to the pentaprism 53 and the first prism 52. The light passes through the second dichroic prism 55 bonded to the first dichroic prism 54, and is further guided to the finder 57 through an eyepiece lens 56 composed of a plurality of lenses.

  A known prism 60, a photometric lens 61, and a photometric sensor 62 for measuring the subject light luminance are disposed on the exit surface of the first dichroic prism 54. The photometric sensor 62 is a flexible printed circuit board (not shown). To the photometric circuit 112 provided on the substrate 34 in the camera body 100a. The photometric sensor 62 is capable of photometrically measuring the shooting screen for each of the divided blocks.

  Above the first dichroic prism 54 (y plus side), a projection lens 70, a folding mirror 71 for changing the direction, a transmissive liquid crystal 72 formed with a distance measuring area display 200 described later, an illumination lens 73, and a transmissive type An LED 74 that is a light source of the liquid crystal 72 is disposed. The transmissive liquid crystal 72 also has a function of an electric shutter. Only the selected distance measuring area display 200a selected from 51 distance measuring area displays 200 described later transmits light from the LED 74, and the light. Is magnified by the projection lens 70 and enters the first dichroic prism 54.

  A finder display liquid crystal 80 and a finder backlight 81 are disposed below the pentaprism 53. The in-finder display liquid crystal 80 displays various information such as exposure control values, exposure modes, exposure correction values, and the like relating to photographing at the lower part of a finder visual field 57a described later in the finder 57. The finder backlight 81 is for illuminating the display liquid crystal 80 in the finder.

  FIG. 2 is a block diagram showing a system configuration of the camera 100 of the present invention. The MCU 101 performs overall control of the camera 100 and is connected to various control circuits described below.

  The A / D conversion circuit 103 performs A / D conversion on the electrical signal that is incident from the photographing lens 10 and output from the image sensor 33. The timing circuit 104 drives the image sensor 33 and the A / D conversion circuit 103 at a predetermined operation timing. The image processing control circuit 105 performs various image corrections on the image data output from the A / D conversion circuit 103 and interpolation processing on the image data of each color. The SDRAM 106 is a memory that temporarily stores the interpolated data. The image recording medium 107 is connected to the image processing control circuit 105 via an interface (not shown), and records shooting data and image data. The rear liquid crystal monitor control circuit 108 controls the rear liquid crystal monitor 35.

  The crop display circuit 109 is a circuit that controls the diffusion type liquid crystal 52. The exposure control circuit 113 controls the shutter control unit 114 and the aperture control unit 115 by calculating the shutter speed and the aperture value of the photographing lens 10 from the luminance and imaging sensitivity of the subject obtained from the photometry circuit 112 described later. The shutter control unit 114 controls the shutter 31, and the aperture control unit 115 controls the aperture 11 of the photographing lens 10. The lens information input unit 116 communicates information such as an open aperture value, a focal length, and an exit pupil from the mounted photographing lens 10 to the camera body 100a.

  The focus detection circuit 117 performs A / D conversion on the output obtained from the focus detection sensor 41 for autofocus at the bottom of the camera 100 in FIG. The lens driving circuit 118 is a circuit for driving the photographing lens 10 to autofocus based on the control result obtained by the lens information input unit 116 and the focus detection circuit 117. The mode setting circuit 119 sets various modes such as exposure, autofocus, and image. The setting operation member 120 is a switch for performing a setting operation on the camera 100, and outputs an operation signal corresponding to the setting operation to the MCU 101. SW1 is a half-push switch that is linked to the first stroke of the release button, and SW2 is a full-push switch that is linked to the second stroke of the release button.

  FIG. 3 is a view showing an image in the viewfinder 57. As shown in the drawing, in the finder 57, a finder field 57a for displaying a subject image and a finder for displaying various information such as exposure control values, exposure modes, and exposure correction values related to photographing provided on the outer periphery of the finder field 57a. A display unit 57b is provided. The in-finder display control circuit 110 in FIG. 2 is a circuit for controlling the in-finder display liquid crystal 80 and the finder backlight 81 for displaying such information on the in-finder display section 57b.

  In this embodiment, the camera 100 has 51 ranging areas. FIG. 4 is a diagram showing 51 total distance measuring area displays 200 in the finder field 57a. In FIG. 4, all 51 ranging area displays 200 are shown. However, all the ranging area displays 200 are not actually lit in the finder field 57a, and the selected ranging areas are displayed. Only the selected ranging area display 200a is lit as shown in FIG. The selected ranging area display 200a does not light for a moment when a release button (not shown) is pressed, but once selected, it continues to light at that position until it is changed.

  Returning to FIG. 2, the superimpose display control circuit 111 is a circuit that performs control when the selected ranging area display 200 a is displayed superimposed on the subject image (superimpose) in the viewfinder visual field 57 a. The superimpose display control circuit 111 controls the transmissive liquid crystal 72 that displays the selected distance measuring area display 200a in the finder visual field 57a and the LED 74 that can change the display brightness of the selected distance measuring area display 200a. The photometric circuit 112 is a circuit that performs A / D conversion on the output obtained from the photometric sensor 62 and outputs the result to the MCU 101, and can measure the luminance of each of the divided areas on the photographing screen. The display device 1 in this embodiment includes a superimpose display control circuit 111, a transmissive liquid crystal 72, an LED 74, and a photometric circuit 112 in the camera 100.

  Next, basic settings for describing the operation of the display device 1 of the present embodiment will be described. FIG. 5 is a diagram in which the numbers (1) to (51) are assigned to the 51 ranging area displays 200 displayed in the viewfinder visual field 57a. This number is given for convenience of explanation, and the distance measurement area display 200 is not actually numbered in the finder field 57a. The 51 ranging area displays 200 are divided into 11 groups. Table 1 below shows how the grouping was performed.

  As shown in Table 1, for example, the ranging area displays 200 of (1) to (3) in the ranging area display 200 in FIG. 5 are the first group. The ranging area displays 200 (4) to (9) are the second group. The third group to the tenth group are as shown in the table, and a description thereof is omitted. The ranging area displays 200 (49) to (51) are the eleventh group.

  As shown in FIG. 5, the shooting screen is divided into a total of 330 photometric areas of 15 vertical and 22 horizontal. Each of these 330 photometric areas is composed of four pixels. These photometry areas are divided into areas including the respective distance measurement area displays 200 divided into the above-mentioned eleven groups. FIG. 6 is a diagram showing block division in the ranging area display. As shown in the drawing, for example, the first photometry block of the photometry area including (1) to (3) in the first group of distance measurement area displays 200 is a portion indicated by [1] in FIG. The second photometry block in the photometry area including (4) to (9) in the second group of distance measurement area displays 200 is the portion indicated by [2] in FIG. The third metering block to the tenth metering block are as shown in FIG. The eleventh block of the photometry area including (49) to (51) in the eleventh range-finding area display 200 is a portion indicated by [11] in FIG. Note that the blocks of these photometry areas are overlapped with adjacent blocks because the ranges are determined so as to include the distance measurement area display 200 and the surrounding photometry areas in each group.

  Here, for example, the photometric blocks adjacent to the first group of photometric blocks [1] shown in FIG. 6A are the photometric block [2] and the photometric block [4] shown in FIG. The photometric blocks adjacent to the second group of photometric blocks [2] shown in FIG. 6C are the photometric block [1] in FIG. 6A, the photometric block [4] in FIG. This is the photometry block [5] in (b). In Table 1, the adjacent block numbers for each photometric block are shown.

  Next, a method for controlling the display brightness of the selected ranging area display 200a in the display device 1 of the present embodiment will be described. 7 and 8 are flowcharts showing a method for controlling the display brightness of the selected ranging area display 200a.

  First, the average exposure value EV of the photometry block is obtained from the average value of the brightness BV of the photometry area in the photometry block of the group including the selected range-finding area display 200a and is set as the reference value EV0 (step 1, hereinafter, step is represented by S). ). For example, when the selected distance measurement area is any one of (1) to (3), the photometry block is [1], and the average exposure is calculated based on the average value of the luminance BV of the photometry area included in the photometry block [1]. A value EV is obtained and set as an exposure value EV0.

  Next, the first adjacent block of the metering block including the selected distance measuring area display 200a is metered to obtain a comparison value EVn. For example, when the photometric block is [1], the average BV value of the photometric block [2] is first obtained as the first (n = 1) adjacent block, and EV1 is obtained therefrom (S2, S3).

A difference ΔEV1 between the reference value EV0 and the comparison value EV1 is obtained from ΔEV1 = EV1−EV0 (S4).
Here, since n = 1 (S4, Yes), ΔEVmax = ΔEVmin = ΔEV1 is set (S6).
Next, n = n + 1 is set (S7), and the process returns to S3 (S8).

  The photometric value of the second adjacent block is obtained. For example, when the photometry block is [1] as described above, the second (n = 2) adjacent block is the photometry block [4]. An average BV value of the photometric block [4] is obtained, and a comparison value EV2 is obtained therefrom (S2, S3).

A difference ΔEV2 between the reference value EV0 and the comparison value EV2 is obtained from ΔEV2 = EV2−EV0 (S4).
Here, since n = 2 and not n = 1 (S5, No), the process proceeds to S9.
When ΔEV2> ΔEVmax (= ΔEV1) (S9, Yes), the maximum value is updated and ΔEVmax = ΔEV2 is set (S10).
If ΔEV2> ΔEVmax (ΔEV1) is not satisfied (S9, No), the process proceeds to S11 with ΔEVmax = ΔEV1.

When ΔEV2 <ΔEVmin (= ΔEV1) (S11, Yes), the minimum value is updated and ΔEV2 = ΔEVmin is set (S12).
If ΔEV2 <ΔEVmin (= ΔEV1) is not satisfied, the process proceeds to S7 with ΔEVmin = ΔEV1 (S11, No).

  In the case of the photometric block [1], the number of adjacent blocks is two. For example, in the case of the photometric block [3], when the number of adjacent blocks is 2 or more, n = n + 1 (S7). ), S2 to S8 are repeated by the number of adjacent blocks.

  Then, the final ΔEVmax obtained as a result of the processing of FIG. 7 for all adjacent blocks is compared with the positive first threshold value ΔEVth1, and the final ΔEVmin is compared with the negative second threshold value ΔEVth2 (FIG. 8, S13).

  FIG. 9 is a diagram in which the relationship among ΔEVmax, ΔEVmin, ΔEVth, and ΔEVth2 is divided into cases. As shown in FIG. 9A, when ΔEVmax ≧ ΔEVth and ΔEVmin> ΔEVth2, the entire block adjacent to the photometry block including the selected distance measurement area display 200a is larger than the photometry block including the selected distance measurement area display 200a. Bright. In this case, when the selected ranging area display 200a is obtained from the reference value EV0, the selected ranging area display 200a feels dark due to the influence of adjacent blocks. Therefore, the selected ranging area display 200a is corrected in the positive direction by adding a positive correction value ΔEVadj to the reference value EV0 (S14), and the luminance of the selected ranging area display 200a is determined based on the value EVcor. .

  As shown in FIG. 9B, when ΔEVmax <ΔEVth1 and ΔEVmin ≦ ΔEVth2, the adjacent block of the photometry block including the selected distance measurement area display 200a is more comprehensive than the photometry block including the selected distance measurement area display 200a. It ’s dark. In this case, when the selected ranging area display 200a is obtained from the reference value EV0, the selected ranging area display 200a feels bright due to the influence of adjacent blocks. Therefore, the selected ranging area display 200a is corrected in the negative direction by adding a negative correction value ΔEVadj to the reference value EV0 (S15), and the luminance of the selected ranging area display 200a is determined based on the value EVcor. .

  The correction value ΔEVadj in the positive direction in the case of FIG. 9A differs depending on the value of ΔEVmax, and the correction value ΔEVadj is larger as ΔEVmax is larger. This is because the subject image of the adjacent block is brighter as ΔEVmax is larger, and the difficulty in viewing the selected distance measuring area display 200a is not sufficiently reduced unless the correction value ΔEVadj is increased. Further, the correction value ΔEVadj in the minus direction in the case of FIG. 9B differs depending on the value of ΔEVmin, and the smaller ΔEVmin (a negative value with a larger absolute value), the smaller the correction value ΔEVadj (a negative value with a larger absolute value). ). This is because the subject image of the adjacent block is darker as ΔEVmin is smaller, and unless the correction value ΔEVadj is decreased, the misalignment due to the selected distance measuring area display 200a being too bright compared to the surroundings cannot be sufficiently reduced.

  As shown in FIG. 9C, when ΔEVmax ≧ ΔEVth1 and ΔEVmin ≦ is ΔEVth2, there are a bright portion and a dark portion in adjacent blocks of the photometry block including the selected distance measurement area display 200a. Become. In this case, even if the correction is made to either the plus side or the minus side, it becomes difficult to see. For this reason, no correction is performed. Further, d) In the case of ΔEVmax <ΔEVth1, ΔEVmin> ΔEVth2, since the influence of the brightness of the adjacent block is small, the correction is not necessary and is not performed (S16).

As described above, the present embodiment has the following effects.
(1) Even if the brightness of the display of the selected ranging area display 200a is determined based only on the luminance of the area including the selected ranging area display 200a, other areas other than the area including the selected ranging area display 200a In addition, for example, when a high-luminance object is present or a black low-reflectance object is present, the display of the selected ranging area display 200a feels brighter or darker due to the influence of these objects. According to the display device 1 of the present embodiment, since the luminance of the selected ranging area display 200a is determined in consideration of the luminance of the adjacent area, areas other than the area including the selected ranging area display 200a have low luminance or high luminance. Difficulty in viewing the selected ranging area display 200a in the viewfinder field 57a in the case of luminance.

(2) The maximum value ΔEVmax obtained by subtracting the reference value EV0 from the comparison value EVn is greater than the first threshold EVth1, and the minimum value ΔEVmin obtained by subtracting the reference value EV0 from the comparison value EVn is smaller than the first threshold EVth1. When the threshold value EVth2 is greater than the threshold value EVth2, the positive correction value EVAdj is added to the reference value EV0, and the display brightness of the selected distance measurement area display 200a is determined based on the corrected value EVcor. Therefore, since the brightness of the distance measurement area display becomes bright when the surroundings are bright, it is easy to see even when the surroundings are bright.

(3) The luminance control means 74, 111 has a maximum value ΔEVmax obtained by subtracting the reference value EV0 from the comparison value EVn smaller than the first threshold EVth1, and a minimum value ΔEVmin obtained by subtracting the reference value EV0 from the comparison value EVn. When the threshold value EVth2 is smaller than the first threshold value EVth1, the negative correction value EVAdj is added to the reference value EV0, and the display brightness of the selected ranging area display 200a is determined based on the corrected value EVcor. Therefore, since the brightness of the ranging area display is also darkened when the surroundings are dark, it is easy to see even when the surroundings are dark.

(4) The correction value EVadj is changed according to the values of ΔEVmax and ΔEVmin, and increases as the absolute values of ΔEVmax and ΔEVmin increase, so that the luminance of the selected ranging area display 200a can be corrected to a more appropriate luminance.

(Deformation)
As described above, various modifications and changes are possible without being limited to the embodiments described above, and these are also within the scope of the present invention.
(1) In the present embodiment, the plus-side correction value varies depending on the value of ΔEVmax. When ΔEVmax is small, the correction value is small, and when ΔEVmax is large, the correction value is large. However, if the correction value on the plus side becomes too large, an unselected distance measurement area display 200 in the distance measurement area display 200 may appear in the viewfinder field 57a. Therefore, the maximum value of the correction value is taken into consideration, for example, the performance of the transmissive liquid crystal 72 as a shutter, so that the unselected ranging area display 200 of the ranging area displays 200 is prevented from being excessively viewed. A limit value may be set.

(2) Further, as described above, in the present embodiment, the minus-side correction value also differs depending on the value of ΔEVmin. When the absolute value of ΔEVmin is small, the correction value is small, and when the absolute value of ΔEVmin is large, the correction value is large. However, if the negative correction value is too large, the distance measurement area display 200 may be too dark and difficult to see even when the surroundings are dark. Therefore, a lower limit value may be set for the correction amount.

(3) In the present embodiment, the method for determining the display luminance is not changed depending on the focal length of the photographing lens 10, but the telephoto lens has less change in luminance in the photographing screen than the wide-angle lens. Therefore, when the focal length of the photographing lens 10 is detected and the focal length is equal to or greater than a predetermined value (telephoto lens), the photometric block is less than 11 blocks according to the focal length as in this embodiment. It may be divided. In this case, the calculation time for determining display luminance can be shortened and the calculation load can be reduced.

(4) In the present embodiment, the BV value in the photometry block is measured, the EV value is obtained from the BV value, and the luminance of the selected distance measuring area display 200a is determined based on the EV value. However, the present invention is not limited to this. If the brightness can be expressed, the processing can be performed with the BV value as it is.

  In addition, although embodiment and a deformation | transformation form can also be used in combination as appropriate, detailed description is abbreviate | omitted. Further, the present invention is not limited by the embodiments described above.

It is the schematic of the camera containing the display apparatus of 1st Embodiment of this invention. It is a block diagram which shows the system configuration | structure of the camera of this invention. It is the figure which showed the screen in a finder. It is the figure which showed all the ranging area displays in the finder visual field. It is the figure which attached | subjected the number of (1)-(51) to 51 all the ranging area displays displayed in a finder visual field. It is the figure which showed the block division in a fine visual field. It is the flowchart which showed the control method of the display brightness | luminance of selection ranging area display. It is the flowchart which showed the control method of the display brightness | luminance of the selection ranging area display following FIG. It is the figure which divided the relationship of (DELTA) EVmax, (DELTA) EVmin, (DELTA) EVth, and (DELTA) EVth2 into cases.

Explanation of symbols

  57: Viewfinder, 57a: Viewfinder field, 72: Transmission type liquid crystal, 74: LED, 100: Camera, 111: Superimpose display control circuit, 200: Distance measurement area display, 200a: Selected distance measurement area display

Claims (10)

A ranging area display that displays a selected ranging area display that indicates the position of the ranging area selected for focusing from among several ranging areas within the viewfinder's field of view with a predetermined brightness superimposed on the subject image Means,
Metering means for metering the luminance of a subject image in a first area including the selected ranging area display in the field of view and the luminance of a subject image in a region other than the first region;
Brightness control means for controlling the display brightness of the selected ranging area display based on the brightness of the subject image in the first area and the brightness of the subject image in the other area;
A display device comprising: The display device according to claim 1,
The display device according to claim 1, wherein the other area is an area adjacent to the first area. The display device according to claim 2,
The display device, wherein the first region and the other region have portions that overlap each other. The display device according to any one of claims 1 to 3,
The luminance control unit performs correction based on a difference between the reference value corresponding to the luminance of the subject image in the other region and the reference value corresponding to the luminance of the subject image in the other region. A display device that controls display brightness of the selected ranging area display based on the corrected value. The display device according to claim 4,
The brightness control means includes
The maximum value obtained by subtracting the reference value from the comparison value is greater than the first threshold value,
When a minimum value obtained by subtracting the reference value from the comparison value is larger than a second threshold value smaller than the first threshold value,
A display device, wherein a positive correction value is added to the reference value, and the display brightness of the selected ranging area display is controlled based on the corrected value. The display device according to claim 4 or 5,
The brightness control means includes
The maximum value obtained by subtracting the reference value from the comparison value is smaller than the first threshold value,
When a minimum value obtained by subtracting the reference value from the comparison value is smaller than a second threshold value smaller than the first threshold value,
A display device, wherein a negative correction value is added to the reference value, and the display luminance of the selected ranging area display is controlled based on the corrected value. The display device according to claim 5 or 6,
The display device according to claim 1, wherein the correction value increases as an absolute value of a value obtained by subtracting the reference value from the comparison value increases. The display device according to claim 7,
An absolute value of the correction value is provided with an upper limit value. The display device according to claim 8,
A shutter function in which the distance measuring area display means displays the selected distance measuring area display within the field of view of the finder by transmitting light from the plurality of distance measuring area displays to the portion of the selected distance measuring area display. Have
A positive upper limit value among the upper limit values reduces the fact that ranging area displays other than the selected ranging area display in the plurality of ranging area displays are displayed in the field of view due to the leaked light. A display device characterized in that it is determined to do so.   A camera provided with the display apparatus of any one of Claims 1-9.

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