JP3496274B2 - Electronic viewfinder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic viewfinder suitable for use in, for example, a VTR with a built-in camera.

[0002]

2. Description of the Related Art FIG. 10 shows the structure of a conventional electronic viewfinder (EVF). In the figure, reference numeral 1 is a lens barrel in which a liquid crystal display panel 2 and a lens 3 are arranged. An eyecup 4 is connected to the open end side of the lens barrel 1 where the lens 3 is arranged. As a result, the user can observe the display surface of the display panel 2 through the lens 3 with the eye 5 in contact with the eyecup 4.

[0003]

In such an electronic viewfinder, when the surroundings are bright, the light leaking from the eyepiece is reflected by the surface of the lens 3 and enters the user's eye 5, so that a display is made. There is a problem that the display surface of the panel 2 becomes difficult to see. In particular, when the user is wearing eyeglasses, the amount of light leaking from the eyepiece increases, which makes it more difficult to see.

As described above, even if light leaks from the eyepiece, the display surface of the display panel 2 can be viewed well.
It is possible to increase the display brightness of. However, when the surroundings are not very bright, such as when shooting indoors, or when using the eyecup 4
Power is wasted when the electronic viewfinder is not used and the eye view is not in use.

In view of this, the present invention provides an electronic viewfinder which prevents unnecessary power consumption and provides a good display surface even when light leaks from the eyepiece.

[0006]

According to another aspect of the present invention, there is provided an electronic viewfinder in which an eyepiece portion is provided with a pulse light emitting portion and a light receiving portion, and the output signal of the light receiving portion is sampled and held at a light emission timing of the pulse light emitting portion. Sample hold means,
Average level detecting means for detecting the average level of the output signal of the light receiving section, difference detecting means for detecting a difference from the average level detected by the average level detecting means of the signal sampled and held by the sample and hold means, and the difference When the magnitude of the difference detected by the detection means becomes smaller than a predetermined value, the brightness of the display element is adjusted according to the first control means for turning off the display element and the average level detected by the average level detection means. And a second control means for controlling.

According to a second aspect of the present invention, in the electronic viewfinder of the first aspect, the first control means detects the difference when the average level detected by the average level detection means becomes larger than a predetermined value. The display element is turned off regardless of the magnitude of the difference detected by the means.

According to a third aspect of the invention, in the electronic viewfinder of the first aspect, the first control means detects the difference when the average level detected by the average level detection means becomes larger than a predetermined value. The display element is turned on regardless of the magnitude of the difference detected by the means.

In the electronic viewfinder according to the invention of claim 4, in the invention of claim 1, the second control means continuously changes the brightness of the display element according to the average level detected by the average level detection means. It changes.

According to a fifth aspect of the present invention, in the electronic viewfinder according to the first aspect of the invention, infrared rays are emitted from the pulse light emitting portion and a visible light cut filter is arranged in front of the light receiving portion. Is.

An electronic viewfinder according to a sixth aspect of the present invention is the electronic viewfinder according to the first aspect of the invention, wherein the light emission frequency of the pulse light emitting portion is 10 Hz or less.

[0012]

According to the present invention, when the difference detected by the difference detecting means becomes smaller than a predetermined value, the display element is turned off, and the user's eyes are in contact with the eyepiece (eyecup). ) And the electronic viewfinder is not substantially used, the light emitted from the pulse light emitting unit is not reflected by the user's eyes and enters the light receiving unit, and the difference detecting means The magnitude of the difference detected in step 3 becomes smaller than a predetermined value, and the display element is turned off. This makes it possible to eliminate waste of power consumption.

The brightness of the display element is controlled according to the average level of the output signal of the light receiving section detected by the average level detecting means. Therefore, when the surroundings are bright and a large amount of light leaks from the eyepiece, the average level of the output signal of the light receiving unit is increased and the display brightness is controlled to be high.
As a result, the display surface can be seen well even if light leaks from the eyepiece. Further, when the surroundings are not so bright, the display brightness can be suppressed low, so that it is possible to eliminate waste of power consumption.

According to another aspect of the present invention, when the average level detected by the average level detecting means exceeds a predetermined value, the display element is turned off regardless of the magnitude of the difference detected by the difference detecting means. In the state where the user's eyes are not in contact with the eyepiece and the electronic viewfinder is not substantially used, the average level detected by the average level detecting means becomes larger than the predetermined value and the display element Is turned off. With this, even when the difference detected due to the failure of the difference detecting means does not become smaller than the predetermined value, the display element is surely turned off when the electronic viewfinder is not substantially used, and power consumption is reduced. It is possible to eliminate waste.

According to the third aspect of the invention, when the average level detected by the average level detecting means exceeds a predetermined value, the display element is turned on regardless of the magnitude of the difference detected by the difference detecting means. The display element is not turned off even when the surroundings are bright and the amount of light leaking from the eyepiece is very large and the difference becomes smaller than a predetermined value. This makes it possible to prevent a malfunction that causes the display element to be turned off when the user's eyes are in contact with the electronic viewfinder and the electronic viewfinder is substantially used.

According to the fourth aspect of the present invention, the brightness of the display element is continuously changed according to the average level detected by the average level detecting means. It is possible to prevent a sudden change that gives the user a feeling of strangeness.

According to the invention of claim 5, infrared rays are emitted from the pulse light emitting portion and a visible light cut filter is arranged on the front surface of the light receiving portion, so that it is not affected by extra light. It is possible to perform on / off control and brightness control of the display element.

According to the sixth aspect of the invention, the light emission frequency of the pulse light emitting section is set to 10 Hz or less, and the output signal of the sample holding means for sampling and holding the output signal of the light receiving section is the fluorescent lamp (50 Hz or 60 Hz). It is possible to avoid the influence of the change in the light amount.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electronic viewfinder according to the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those in FIG. 10 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, the liquid crystal display panel 2 is composed of a panel body 2a and a backlight portion 2b. The panel body 2a is configured to have a liquid crystal display cell and a driver, as is well known in the art, and an imaging video signal and power are supplied to the panel body 2a (not shown). The backlight unit 2b is configured to have a fluorescent lamp as is well known in the art, and power is supplied to the backlight unit 2b, which is not shown. Here, the light emitted from the backlight unit 2b is supplied to the user's eyes 5 through the lens 3 after the transmission amount of each pixel is limited by the panel body 2a. Thereby, the user can recognize the display image by the video signal on the display surface of the panel body 2a.

Reference numeral 6 is an ambient light detection circuit. An infrared light emitting diode 7 forming a pulse light emitting portion and a phototransistor 8 forming a light receiving portion are connected to the ambient light detecting circuit 6. A visible light cut filter 9 for blocking visible light is arranged on the light receiving surface side of the phototransistor 8. As will be described later, the signals C1 and C2 output from the ambient light detection circuit 6 are supplied as control signals to the brightness control circuit 10 that controls the brightness of the backlight unit 2b.

As shown in FIG. 2, the light emitting diode 7 and the phototransistor 8 are arranged, for example, inside the eyecup 4 at a position where sunlight is difficult to enter directly. As a result, the saturation of the phototransistor 8 is prevented. By disposing the light emitting diode 7 and the phototransistor 8 in the eyecup 4 in this manner, infrared rays emitted from the light emitting diode 7 are emitted by the user when the user's eyes 5 are in contact with the eyecup 4. The light is reflected by the eye 5 and is supplied to the phototransistor 8. The light emitted from the light emitting diode 7 is not directly supplied to the phototransistor 8.

FIG. 3 shows a configuration example of the ambient light detection circuit 6. In the figure, the vertical synchronizing signal VD (the cycle is 1/60 seconds) supplied to the input terminal 15 is frequency-divided by the frequency divider 16 by 1/8, and then supplied to the mono-multivibrator 17 as a trigger signal. 8 from Mono Multivibrator 17
A predetermined pulse width (for example, 1 m
(Seconds) pulse signal is supplied to the drive circuit 18. As a result, infrared rays are emitted from the light emitting diode 7 every 8/60 seconds.

The output signal of the phototransistor 8 is amplified by the amplifier 21 and supplied to the sample hold circuit 22. The pulse signal output from the mono-multivibrator 17 is supplied to the sample-hold circuit 22 as a sampling pulse via the buffer amplifier 23. As a result, in the sample hold circuit 22, the output signal of the amplifier 21 is sampled and held at the light emission timing of the light emitting diode 7.

Here, FIG. 4A shows a pulse signal output from the mono-multivibrator 17, and FIG. 4B shows an output signal of the amplifier 21 when the user's eyes 5 are in contact with the eyecup 4. Is shown. Therefore, the sample-and-hold circuit 22 the signal V _A is the sample-and-hold, the signal V _A is supplied to the positive terminal of the subtracter 24.

Further, the output signal of the amplifier 21 is supplied to a low-pass filter 25 as an average level detecting means, and from this low-pass filter 25, a signal V _B indicating the average level of the output signal of the amplifier 21 is obtained. Here, since the pulse width of the pulse signal output from the mono multivibrator 17 is set to be narrow, the signal V _B becomes substantially equal to the low level portion of the output signal of the amplifier 21. The signal V _B may be obtained by sample-holding the low level portion of the output signal of the amplifier 21 with the inverted signal of the pulse signal output from the mono multivibrator 17.

The signal V _B output from the low pass filter 25 is supplied to the negative terminal of the subtractor 24. Subtractor 24
Then, the signal V _B is subtracted from the signal V _A with a coefficient of 1: 1 to form a difference (V _A −V _B ). Difference output from the subtractor 24 (V _A -V _B) is supplied to the comparator 27 through a low-pass filter 26. The comparison reference signal Vref1 is supplied to the comparator 27. From the comparator 27,
(V _A -V _B) when a ≧ Vref1 together with the high level "H" (V _A -V _B) <becomes a low level "L" when it is Vref1 signal S1 is outputted. This signal S1 is supplied to the AND circuit 28.

The signal V _B output from the low pass filter 25 is supplied to the comparator 29. This comparator 29
Is supplied with a comparison reference signal Vref2. The comparator 29 outputs a signal S2 that is high level “H” when V _B ≧ Vref2 and low level “L” when V _B <Vref2. This signal S2 is the control signal C1
Is output to the output terminal 31 via the buffer amplifier 30.

Further, the signal V _B output from the low pass filter 25 is supplied to the comparator 32. This comparator 32
Is supplied with a comparison reference signal Vref3 (Vref3> Vref2). The comparator 31 outputs a signal S3 that attains a low level “L” when V _B > Vref3 and a high level “H” when V _B ≦ Vref3. This signal S3 is supplied to the AND circuit 28. Then, the output signal of the AND circuit 28 is derived at the output terminal 33 as the control signal C2.

Returning to FIG. 1, the brightness control circuit 10
Then, when the control signal C1 is at a low level "L", control is performed so that the brightness of the backlight unit 2b, and thus the display brightness, becomes a normal value, while when the control signal C1 is at a high level "H". Is controlled so that the brightness of the backlight unit 2b, that is, the display brightness is higher than a normal value.
Further, when the control signal C2 is at the high level “H”,
The backlight unit 2b is turned on and controlled so as to be in a display-on state. On the other hand, when the control signal C2 is at the low level "L", the backlight unit 2b is turned off and is in a display-off state. Controlled by.

In the above configuration, first, consider a state in which the user's eyes 5 are not in contact with the eyecup 4 and the electronic viewfinder is not substantially used. In this state, infrared rays emitted from the light emitting diode 7 is reflected by the eye of the user 5 without that enters the phototransistor 8, the difference output from the subtractor 24 (V _A -V _B) is a comparison reference It becomes smaller than the signal Vref1.
Therefore, the output signal S1 of the comparator 27 becomes low level "L", the control signal C2 output from the AND circuit 28 becomes low level "L", and the backlight unit 2b is turned off by the brightness control circuit 10 for display. It is turned off.

Next, the user's eyes 5 are put on the eye cup 4.
Imagine that the eye is being viewed. In this state, the infrared rays emitted from the light emitting diode 7 are reflected by the eyes of the user 5 and enter the phototransistor 8, so that the subtractor 2
The difference (V _A −V _B ) output from 4 is the comparison reference signal Vre
It becomes larger than f1. Therefore, the output signal S1 of the comparator 27 becomes high level "H", the control signal C2 output from the AND circuit 28 becomes high level "H", and the backlight control section 10b is turned on by the brightness control circuit 10 and displayed. It is turned on.

In this condition, when the surroundings are not so bright indoors, the signal V _B output from the low pass filter 25 is smaller than the comparison reference signal V ref2 because the amount of light leaking from the eye cup 4 is small. Get smaller.
Therefore, the control signal C1 output from the comparator 29 becomes a low level "L", and the brightness control circuit 10 sets the brightness of the backlight unit 2b, that is, the display brightness to a normal value.

On the other hand, in a bright environment such as outdoors, the amount of light leaking from the eyecup 4 is large.
Signal V _B output from the low pass filter 25 is larger than the comparison reference signal Vref2. Therefore, the control signal C1 output from the comparator 29 becomes the high level “H”,
The backlight unit 2b is controlled by the brightness control circuit 10.
, And thus the display brightness is made higher than the normal value.

As described above, according to this example, the display is turned off when the user's eyes 5 are not in contact with the eyecup 4 and the electronic viewfinder is not substantially used. In addition, when the user's eyes 5 are in contact with the eye cup 4 and the electronic viewfinder is used and the surroundings are not so bright, the display brightness is controlled to a normal value, so that power consumption is not wasted. You can In addition, the user's eyes 5 on the eyecup 4
The display brightness is controlled to be higher than the normal value when the surroundings are bright with the eye view being used and the electronic viewfinder is used, so that the display surface of the display panel 2 can be viewed well even if light leaks from the eyepiece. be able to.

By the way, the output signal V _B of the low-pass filter 25 becomes larger than the comparison reference signal Vref3 when the eye 5 of the user is not in contact with the eye and the electronic viewfinder is not substantially used. for that reason,
The signal S3 output from the comparator 32 has a low level "L".
Therefore, the control signal C2 output from the AND circuit 28 becomes low level "L". Therefore, even if the output signal S1 of the comparator 27 does not become the low level "L" due to the failure of the sample hold circuit 22, the subtractor 24, the comparator 27, etc., the display can be surely turned off.
Waste of power consumption can be eliminated.

FIG. 5 shows the relationship between the ambient light amount and the display brightness when the output signal S1 of the comparator 27 is at the high level "H". In the figure, L2
Is the ambient light amount corresponding to the comparison reference signal Vref2 supplied to the comparator 29, and L3 is the ambient light amount corresponding to the comparison reference signal Vref3 supplied to the comparator 31.

Further, according to this example, since infrared rays are emitted as pulses from the light emitting diode 7 and the visible light cut filter 9 is arranged on the light receiving surface of the phototransistor 8, it is affected by extra light. The display on / off control and the brightness control can be satisfactorily performed. Also,
Since the period of pulsed light emission of the light emitting diode 7 is 8/60 seconds and the light emission frequency is 10 Hz or less, when the sampling theorem is taken into consideration, the output signal of the sample hold circuit 22 depends on the light quantity change of the fluorescent lamp (50 Hz or 60 Hz). It is possible to avoid the effects.

Next, another configuration example of the ambient light detection circuit 6 will be described with reference to FIG. In FIG. 6, FIG.
The same reference numerals are given to the portions corresponding to, and the detailed description thereof will be omitted.

In the figure, the output signals S1 and S2 of the comparators 27 and 29 are respectively supplied to the OR circuit 35, and the output signal of the OR circuit 35 is output to the output terminal 3 as the control signal C2.
6 is derived. The present example is configured as described above, and the others are configured similarly to the example of FIG. The AND circuit 28 and the comparator 29 in the example of FIG. 3 are not provided.

With the above structure, as in the example of FIG.
In a bright environment such as outdoors, the amount of light leaking from the eye cup 4 is larger, so the low pass filter 25
The output signal V _B becomes larger than the comparison reference signal V ref2, and the output signal S2 of the comparator 29 is at the high level “H”.
Becomes Therefore, in such a bright environment, the control signal C2 output from the OR circuit 35 is always at the high level "H" regardless of the output signal S1 of the comparator 27,
The display-on state is maintained.

When the surroundings are bright and the amount of light leaking from the eyecup 4 is very large, the output signal V _A of the sample hold circuit 22 is saturated, and the output signal V _B of the low pass filter 25 is added to this signal V _A. approach because, the difference output from the subtractor 24 (V _A -V _B) is a comparison reference value Vre
It may become smaller than f1 and the output signal S1 of the comparator 27 may become low level “L”. However, in the present example, as described above, in the bright surroundings, the control signal C2 output from the OR circuit 35 is constantly set to the high level “H” by the output signal S2 of the comparator 29, so It is possible to prevent an erroneous operation in which the user's eyes 5 are brought into the eye and the display is turned off even though the electronic viewfinder is substantially used.

Incidentally, FIG. 7 shows the output signal S1 of the comparator 27.
Shows the relationship between the ambient light amount and the display brightness in the state where is at the high level "H". In the figure, L2 is a comparison reference signal Vref2 supplied to the comparator 29.
Is the amount of ambient light. The other operations of this example are the same as those of the example of FIG. 3, and thus the description thereof is omitted.

Next, another configuration example of the ambient light detection circuit 6 will be described with reference to FIG. In FIG. 8, FIG.
The same reference numerals are given to the portions corresponding to, and the detailed description thereof will be omitted.

In this example, an operational amplifier 41 is arranged instead of the comparator 29 of the example of FIG. That is, the output signal V _B of the low pass filter 25 is supplied to the non-inverting input terminal of the operational amplifier 41. This operational amplifier 4
The voltage Vref4 is applied to the inverting input terminal of No. 1 via the resistor 42, and the output terminal thereof is connected to the inverting input terminal via the resistor 43. In this case, the operational amplifier 41
A signal S4 that continuously changes as the output signal V _B increases is obtained at the output terminal of the. This signal S4 is derived as a control signal C1 to the output terminal 45 via the buffer amplifier 44. The brightness control circuit 10 controls the brightness of the backlight unit 2b, that is, the display brightness, to continuously change based on the control signal C1. Other configurations of this example are similar to those of the example of FIG.

FIG. 9 shows the relationship between the ambient light amount and the display brightness when the output signal S1 of the comparator 27 is at the high level "H". In the figure, L3
Is an ambient light amount corresponding to the comparison reference signal Vref3 supplied to the comparator 32. As described above, according to this example, the display brightness can be continuously changed according to the ambient light amount, and it is possible to prevent the display brightness from abruptly changing and giving the user a feeling of strangeness.

Although the ambient light detection circuit 6 of the above-described embodiment has shown that the control signals C1 and C2 are formed by hardware, for example, the output signal V of the sample hold circuit 22 is used.
The output signal V _B of the _A and the low-pass filter 25 is A / D-converted and input to a microcomputer, and the control signal C is softened by the microcomputer.
It can also be configured to form 1, C2.

In the above-described embodiment, the display is turned off when the eye view 4 is not in contact with the eye and the electronic viewfinder is not substantially used. The display brightness may be lowered.

Further, although the above-mentioned embodiment is an example using the liquid crystal display panel 2, the present invention can be similarly applied to an electronic viewfinder using other display elements such as a small CRT.

[0050]

According to the first aspect of the present invention, when the difference detected by the difference detecting means becomes smaller than a predetermined value, the display element is turned off, and the eyes of the user have an eyepiece. In a state where the eye view is not in contact with the eye and the electronic viewfinder is not substantially used, the light emitted from the pulse light emitting unit is not reflected by the user's eyes and is incident on the light receiving unit. Since the magnitude of the difference detected by the difference detecting means becomes smaller than a predetermined value and the display element is turned off, it is possible to eliminate waste of power consumption.

Further, the display brightness is controlled according to the average level of the output signal of the light receiving section detected by the average level detecting means, and when the surroundings are bright and more light leaks from the eyepiece section, the output signal of the light receiving section is increased. The display level is controlled so that the average level becomes higher and the display brightness becomes higher, so the display surface can be seen well even if light leaks from the eyepiece, and the display brightness is low when the surroundings are not so bright. Since it is suppressed, it is possible to eliminate waste of power consumption.

According to the second aspect of the invention, when the average level detected by the average level detecting means becomes larger than a predetermined value, the display element is turned off regardless of the magnitude of the difference detected by the difference detecting means. In the state where the user's eyes are not in contact with the eyepiece and the electronic viewfinder is not substantially used, the average level detected by the average level detection means is displayed as being larger than a predetermined value. Since the element is turned off, the display element is surely turned off when the electronic viewfinder is not substantially used even if the difference detected due to a failure of the difference detection means does not become smaller than a predetermined value. Therefore, it is possible to eliminate waste of power consumption.

According to the third aspect of the invention, when the average level detected by the average level detecting means becomes larger than a predetermined value, the display element is turned on regardless of the magnitude of the difference detected by the difference detecting means. Since the display element is not turned off even when the difference is smaller than a predetermined value due to a large amount of light that leaks from the eyepiece because the surrounding area is bright,
It is possible to prevent erroneous operation in which the display element is turned off when the user's eyes are in contact with the eye and the electronic viewfinder is substantially used.

According to the fourth aspect of the present invention, the brightness of the display element is continuously changed according to the average level detected by the average level detecting means, and the brightness change of the display element can be made smooth. Can be prevented from changing suddenly and giving the user a feeling of strangeness.

According to the invention of claim 5, infrared rays are emitted from the pulse light emitting portion and a visible light cut filter is arranged on the front surface of the light receiving portion, so that it is not affected by extra light. On / off control and brightness control of the display element can be performed.

According to the sixth aspect of the present invention, the light emission frequency of the pulse light emitting unit is set to 10 Hz or less, and the output signal of the sample holding means for sampling and holding the output signal of the light receiving unit is a fluorescent lamp (50 Hz or 60 Hz). It is possible to avoid the influence of the change in the light amount of.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an electronic viewfinder according to the present invention.

FIG. 2 is a diagram showing a mounting position of a light emitting diode or a phototransistor.

FIG. 3 is a block diagram showing a configuration example of an ambient light detection circuit.

FIG. 4 is a diagram showing waveforms of a main part of the ambient light detection circuit of FIG.

5 is a diagram showing a relationship between ambient light amount and display brightness in the ambient light detection circuit of FIG.

FIG. 6 is a block diagram showing another configuration example of an ambient light detection circuit.

7 is a diagram showing a relationship between ambient light amount and display brightness in the ambient light detection circuit of FIG.

FIG. 8 is a block diagram showing another configuration example of an ambient light detection circuit.

9 is a diagram showing a relationship between ambient light amount and display brightness in the ambient light detection circuit of FIG.

FIG. 10 is a diagram showing a configuration example of a conventional electronic viewfinder.

[Explanation of symbols]

1 lens barrel 2 Liquid crystal display panel 2a panel body 2b Backlight part 3 lenses 4 eyecup 5 user's eyes 6 Ambient light detection circuit 7 Infrared light emitting diode 8 phototransistors 9 Visible light cut filter 10 Brightness control circuit 22 Sample and hold circuit 24 Subtractor 25,26 low pass filter 27, 29, 32 comparator 28 AND Circuit 31, 33, 36, 45 output terminals 35 OR circuit 41 operational amplifier

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Kimura 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Within Sony Corporation (56) Reference JP-A-60-177774 (JP, A) JP-A 4-373265 (JP, A) JP-A-5-34574 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/222-5/257

Claims (6)

(57) [Claims] 1. A pulse light emitting portion and a light receiving portion are provided in an eyepiece portion, sample hold means for sampling and holding an output signal of the light receiving portion at a light emission timing of the pulse light emitting portion, and an average level of the output signal of the light receiving portion. An average level detecting means for detecting the difference, a difference detecting means for detecting a difference between the signal sampled and held by the sample and hold means from the average level detected by the average level detecting means, and a difference detecting means for detecting the difference. First control means for turning off the display element when the magnitude of the difference is smaller than a predetermined value, and second control means for controlling the brightness of the display element according to the average level detected by the average level detection means. And an electronic viewfinder. 2. The first control means, when the average level detected by the average level detection means becomes larger than a predetermined value, regardless of the magnitude of the difference detected by the difference detection means. The electronic viewfinder according to claim 1, wherein the display element is turned off. 3. The first control means, when the average level detected by the average level detection means is larger than a predetermined value, regardless of the magnitude of the difference detected by the difference detection means. The electronic viewfinder according to claim 1, wherein the display element is turned on. 4. The second control means continuously changes the brightness of the display element according to the average level detected by the average level detection means.
Electronic viewfinder described in. 5. The electronic viewfinder according to claim 1, wherein infrared rays are emitted from the pulse light emitting unit, and a visible light cut filter is disposed on the front surface of the light receiving unit. 6. The light emitting frequency of the pulse light emitting portion is 10H.
The electronic viewfinder according to claim 1, wherein z or less.