JP4213720B2 - Digital camera image display device - Google Patents

Description

  The present invention relates to an image display device such as a liquid crystal display device for displaying an image provided in a digital camera.

  2. Description of the Related Art Conventionally, a digital camera having an information display device for displaying information such as date and operation mode and an image display device for displaying a captured image is known.

  Since such a digital camera has two display devices, the number of parts is large and the structure is complicated. Therefore, a configuration in which the information display device is omitted and information is also displayed on the image display device is conceivable. However, in recent years, a backlight type liquid crystal display device has been used as an image display device, and a fluorescent tube tends to be used to illuminate the display panel of the liquid crystal display device. This liquid crystal display displays only information. In some cases, it is necessary to light the fluorescent tube, and there is a problem that power consumption by the fluorescent tube is increased.

  The present invention makes it possible to display information such as characters different from a photographed image on an image liquid crystal display provided in a digital camera, and to suppress the power consumption of a backlight that illuminates the image liquid crystal display as much as possible. With the goal.

  An image display device of a digital camera according to the present invention is a liquid crystal display element, and an image display area for displaying an image based on an image signal corresponding to a subject image read from an image sensor, and information different from the image A single image display means having an information display area for displaying the image, an image illumination means for illuminating the image display area of the image display means, and an information illumination for illuminating the information display area of the image display means And an optical filter that irradiates only the information display area with light emitted from the information illumination means, a part of the image display area is the information display area, and the information illumination means is different from the image in the image display means. When only the information is displayed in the information display area, only the information display area is illuminated via the optical filter, and the image illumination means displays the image and the information different from the image. When displaying in the image display area, the image display area is illuminated.

  Preferably, the image illumination means is a fluorescent tube.

  Preferably, the information illumination means is a light emitting diode.

  Preferably, when the image display means displays the image in the image display area and displays information different from the image in the information display area, the image illumination means illuminates the image display area and the information illumination means displays the information. Illuminate the area.

  As described above, according to the present invention, information such as characters different from the photographed image can be displayed on the image liquid crystal display provided in the digital camera, and the power consumption of the backlight that illuminates the image liquid crystal display is reduced. It is suppressed as much as possible.

  A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a digital camera according to the first embodiment of the present invention.

  The digital camera 10 is a device that captures a subject image and records the captured image in a built-in memory, and includes a main body 11 and an image display device 20.

  An image display device 20 is provided on the upper surface 11a of the main body 11 of the digital camera 10 so as to be rotatable in the arrow X direction with the hinge portion 11d as a support shaft. The image display device 20 is provided with a backlight type liquid crystal display element (LCD) 21 on which a captured image or a recorded image can be displayed. Although not shown in FIG. 1, an illuminating device for illuminating the LCD 21 is provided inside the image display device 20, and this illuminating device comprises two illuminating means as will be described later.

  On the upper surface 11a of the main body 11, a release button 51 for recording a photographed image in a built-in memory, a mode switching button 53 for switching the operation mode of the digital camera 10, and two illumination means for illuminating the LCD 21 are provided. An illumination switching button 52 for switching is provided.

  A lens barrel 19 is provided on the front side of the digital camera 10, that is, on the front side 11 b (not visible in FIG. 1) of the main body 11, and a photographic lens 18 is attached to the lens barrel 19. A power switch 59 for driving the digital camera 10 is provided on the back surface 11 c of the main body 11.

  FIG. 2 shows the LCD 21 of the image display device 20. The LCD 21 is divided into an area between the code A and the code B, that is, an image display area E1, and an area between the code B and the code C, that is, an information display area E2, and the image display area E1 includes a captured image or a recorded image. Can be displayed. Information other than an image can be displayed in the information display area E2, and this information is, for example, a character or a figure indicating a date, an operation mode, the number of shootable images, and the like.

  2 tentatively shows the divided areas of the LCD 21, and the LCD 21 may be divided in any area.

  The configuration of the image display device 20 will be described with reference to FIG. FIG. 3 is a side sectional view schematically showing the image display device 20.

  Two illumination units are disposed on the back side of the LCD 21 of the image display device 20 via a diffusion plate 24 that diffuses light. One of the two illumination means is an image illumination means 22 for illuminating the image display area E1, and the other is an information illumination means 23 for illuminating the information display area E2. The power consumption of the information illumination means 23 is lower than the power consumption of the image illumination means 22.

  The image illuminating means 22 is an edge light type, and a light source 22b is provided at one end. The light source 22b is a fluorescent tube, and the light from the fluorescent tube 22b is reflected by the reflection plate 22c, conducted through the light guide plate 22a, and diffused by the diffusion plate 24, thereby illuminating the upper image display region E1.

  The information illumination means 23 is composed of two to three light emitting diodes arranged along the information display area E2. Since the power consumption per one light emitting diode is 1/10 or less of that of the light source 22b, the power consumption of the information illumination means 23 is sufficiently lower than that of the light source 22b. The light emitted from the information illumination means 23 is diffused by the diffusion plate 24, and the information display area E2 is illuminated.

  The electrical configuration of the digital camera 10 will be described with reference to FIGS. FIG. 4 is a block diagram showing the digital camera 10. The digital camera 10 is controlled by a central processing unit (CPU) 40.

  The digital camera 10 is provided with a battery 46, and each circuit is connected to the battery 46 via a direct current / direct current (DC / DC) converter 45. The voltage of the battery 46 is stabilized by the DC / DC converter 45, and each circuit is driven by switching the power switch 59 to ON.

  When the power switch 59 is switched on, only information such as date and operation mode is displayed on the LCD 21. That is, character and graphic data corresponding to information such as the date and operation mode acquired by the CPU 40 is read from the read-only memory (ROM) 49, and the character and graphic data are displayed in the information display area E2 of the LCD 21 by the LCD signal processing circuit 61. Displays characters or figures based on the data. As the information is displayed, only the information illumination unit 23 is turned on by the drive circuit 63, and the information display area E2 of the LCD 21 is illuminated.

  By pressing the mode switching button 53, the operation mode of the digital camera is switched. For example, when the mode switch button 53 is pressed once, the operation mode is switched to the shooting mode, and then when the second press is performed, the operation mode is switched to the reproduction mode, and when the third press is performed, The operation mode is switched to the recording mode. Thereafter, when the mode switching button 53 is pressed, the operation mode switching is repeated as in the first to third pressing.

  When the operation mode is switched to the photographing mode by the mode switching button 53, the image sensor (area sensor) 30 is driven by the sensor driving circuit 33. As a result, light from the subject is detected by the image sensor 30 via the photographing lens 18 and converted into an electrical image signal corresponding to the subject image. This image signal is amplified by an amplifier (Amp) 31 and converted from an analog signal to a digital signal by an analog / digital (A / D) converter 32. The digital image signal is subjected to processing such as shading correction and interpolation processing in an image processing circuit (DSP) 41, and is temporarily stored in the image memory 43 by the memory controller 42.

  A digital image signal is read from the image memory 43 by the memory controller 42, converted into an analog video signal by the LCD signal processing circuit 61, and an image based on this signal is displayed in the image display area E 1 of the LCD 21. Along with this image display, the image illumination means 22 is turned on by the drive circuit 62, and the image display area E1 of the LCD 21 is illuminated. At this time, an image and information are displayed on the LCD 21, and both the image illumination means 22 and the information illumination means 23 are lit.

  In the photographing mode, the subject is continuously imaged by the image sensor 30, and a moving image is displayed in the image display area E1 of the LCD 21. In this shooting mode, angle of view adjustment and manual exposure correction by an adjustment dial (not shown) are performed while checking a moving image. When the mode is switched to the shooting mode by the mode switching button 53, the image illumination means 22 continues to be lit until the shooting mode is finished.

  When the operation mode is switched to the recording mode by pressing the mode switching button 53, the image illumination means 22 is turned off, and the imaging of the subject by the image sensor 30 and the display of the image display area E1 of the LCD 21 are finished. When the release button 51 is half-pressed in this state, the image signal corresponding to the subject image is detected by the image sensor 30 as described above, and predetermined processing is performed on this signal by the Amp 31, the A / D converter 32, and the DSP 41. The digital image signal subjected to is temporarily stored in the image memory 43. The digital image signal is read from the image memory 43 by the memory controller 42, converted into an analog video signal by the LCD signal processing circuit 61, and the image is displayed in the image display area E1. While the release button 51 is half-pressed, the subject image is continuously picked up by the image sensor 30, so that a moving image is displayed in the image display area E1 of the LCD 21. Thereby, the subject image immediately before recording can be confirmed. While the moving image is displayed, the image illumination means 22 is turned on by the drive circuit 62, and the image display area E1 of the LCD 21 is illuminated.

  When the moving image displayed in the image display area E1 of the LCD 21 is confirmed by the operator and the release button 51 is fully pressed, the digital image signal stored in the image memory 43 is read by the memory controller 42 immediately before the release button 51 is fully pressed. And stored in the built-in memory 44. The still image stored in the built-in memory 44 is displayed in the image display area E1 of the LCD 21 so that the recorded image can be confirmed. The display of the still image is performed for a few seconds. When the display of the still image is completed, the image illumination unit 22 is turned off. The above operation is repeated every time the release button 51 is operated. Note that when the release operation is released from the half-pressed state of the release button 51, the display of the moving image in the image display area E1 is immediately terminated, and the image illumination unit 22 is turned off.

  When the operation mode is switched to the reproduction mode by pressing the mode switching button 53, the image illumination unit 22 is turned off, and the display of the image display area E1 of the LCD 21 is ended. A digital image signal is read from the built-in memory 44, converted into a video signal corresponding to the LCD 21 in the LCD signal processing circuit 61, and an image based on the video signal is displayed in the image display area E1 of the LCD 21. Along with this image display, the image illumination means 22 is turned on, and the image display area E1 of the LCD 21 is illuminated.

  Only when the image is displayed as described above, the image illumination means 22 is turned on. The information illumination means 23 is turned on when the power switch 59 is switched on, and is turned off when the power switch 59 is switched off.

  It is also possible to forcibly control turning on and off of the image illumination means 22 and the information illumination means 23 by the illumination switching button 52. For example, when the illumination switching button 52 is pressed once, the image illuminating means 22 is turned on. When the second pressing is performed next, the information illuminating means 23 is turned on, and when the third pressing is performed, When the image illumination means 22 is turned off and the fourth press is performed, the information illumination means 23 is turned off. When the illumination switch button 52 is subsequently pressed, the first to fourth states are repeated.

  The digital camera 10 can be connected to an external device such as a computer. A digital image signal is read from the built-in memory 44 in accordance with an instruction from the CPU 40 and output to the external device via the interface 80.

  As described above, according to the first embodiment, a captured or recorded image can be displayed in the image display area E1 of the LCD 21 provided in the digital camera 10, and the date and operation mode can be displayed in the information display area E2. Characters or figures indicating such information can be displayed. That is, since information is displayed on the LCD 21 for displaying an image, there is no need to provide an LCD for displaying information, the number of parts is reduced, and the configuration is simplified. Moreover, since the image illumination means 22 with high power consumption and the information illumination means 23 are provided and the information display area E2 is illuminated by the information illumination means 23, when illuminating only the information display area E2, image illumination with high power consumption is achieved. It is not necessary to use the means 22, and power consumption is suppressed.

  A second embodiment will be described with reference to FIG. FIG. 5 is a side sectional view schematically showing the image display device 120 provided in the digital camera of the second embodiment. The second embodiment is different from the first embodiment in the configuration of the image display device 120, and the other points are the same. Only different points will be described below.

  The image display device 120 has an LCD 21. On the back side of the image display area E1 and the information display area E2 of the LCD 21, an image illumination means 22 is provided via a diffusion plate 24. An information illuminating unit 23 for irradiating light is disposed between the LCD 21 and the diffusion plate 24, and a half mirror 26 is disposed so as to have an angle of 45 degrees with respect to the optical axis of the information illuminating unit 23.

  When the digital camera is turned on, that is, when only information is displayed in the information display area E2 of the LCD 21, only the information illumination means 23 is lit. A part of the light emitted from the information illumination means 23 is reflected by the half mirror 26 and enters the information display area E2. Thereby, the information display area E2 is illuminated.

  Only when an image is displayed on the LCD 21, the image illumination means 22 is turned on and the information illumination means 23 is turned off. The image illuminating means 22 includes a flat fluorescent tube 22d and a reflecting plate 22e, and emits light above the image illuminating means 22. This light is diffused by the diffusion plate 24, and the image display area E1 of the LCD 21 is illuminated. Further, part of the light from the image illuminating means 22 is transmitted through the half mirror 26, and the information display area E2 is illuminated.

  When the image illumination means 22 is turned off, the information illumination means 23 is turned on and only the information display area E2 is illuminated. The image illuminating means 22 may be an edge light type backlight as in the first embodiment.

  As described above, also in the second embodiment, similar to the first embodiment, the LCD 21 provided in the digital camera can display the captured or recorded image and information such as the date and the operation mode. There is no need to provide an LCD for displaying information, the number of parts is reduced, and the configuration is simplified. Further, when only the information is displayed on the LCD 21, the information display area E <b> 2 is illuminated by the information illumination unit 23, so that power consumption can be suppressed. Furthermore, in the second embodiment, when displaying an image on the LCD 21, only the image illumination means 22 is turned on, and the information display area E2 is also illuminated by the image illumination means 22, so that the power consumption is higher than in the first embodiment. Reduced.

  A third embodiment will be described with reference to FIG. FIG. 6 is a side sectional view schematically showing the image display device 130 provided in the digital camera of the third embodiment. The third embodiment is different from the first embodiment in the configuration of the image display apparatus 130, and the other points are the same. Only different points will be described below.

  The image display device 130 has an LCD 21. An image can be displayed in an area between the reference sign A and the reference sign C of the LCD 21, that is, the entire surface (hereinafter referred to as an image display area) E3. In particular, a part of the image display area E3, that is, the information display area E2 is superimposed on the image. Information can also be displayed.

  On the back side of the image display area E3 of the LCD 21, image illuminating means 22 is provided via a diffusion plate 25. One end (reference numeral 25a) of the diffusing plate 25 is refracted, and the information illumination means 23 is provided for the refracting portion 25a.

  When the power of the digital camera is turned on, that is, when only information is displayed on the LCD 21, only the information illumination means 23 is lit. The light emitted from the information illumination means 23 is diffused by the refracting portion 25a of the diffusion plate 25 and enters the information display area E2 from the oblique direction. Thereby, the information display area E2 is illuminated.

  Only when an image is displayed on the LCD 21, the image illumination means 22 is turned on and the information illumination means 23 is turned off. The image illuminating means 22 is of an edge light type and is composed of a light source 22b, a reflecting plate 22c and a light guide plate 22a, and emits light above the image illuminating means 22. This light is diffused by the diffusion plate 25, and the image display area E3 of the LCD 21 is illuminated. At this time, information can be displayed in the information display area E2 so as to be superimposed on the image.

  When the image illumination means 22 is turned off, the information illumination means 23 is turned on, only the information display area E2 is illuminated, and information is displayed in the information display area E2. The image illuminating means 22 may be a flat fluorescent tube as in the second embodiment.

  As described above, according to the third embodiment, as in the first embodiment, the LCD 21 provided in the digital camera displays the captured or recorded image and information such as date and operation mode. Thus, the number of parts is reduced and the configuration is simplified. Further, when only information is displayed on the LCD 21, the information illumination means 23 is used, so that power consumption can be reduced. Further, when the image is displayed, the image display area E3 of the LCD 21 is illuminated by the image illumination means 22, so that the image can be displayed also in the information display area E2.

  A fourth embodiment will be described with reference to FIGS. The fourth embodiment is different from the third embodiment in that the optical filters 27 and 28 are used in the image display device 140, and when information is displayed on the LCD 21 together with the image, the image illumination means 22 and the information illumination means 23 are used. It is the point which lights up both. The other points are the same. Only different points will be described below.

  The optical filter 27 is attached to the lower surface of the LCD 21 of the image display device 140 in correspondence with a region between the reference symbols A and B, that is, a partial region E1 excluding the information display region E2 from the image display region E3.

  On the back side of the image display area E3 of the LCD 21, image illuminating means 22 is provided via a diffusion plate 25, and one end (reference numeral 25a) of the diffusion plate 25 is refracted, and an optical filter is applied to the refracting portion 25a. 28 and information illumination means 23 are provided.

  FIG. 8 shows an emission spectrum distribution L20 of the image illumination unit 22, an emission spectrum distribution L10 of the information illumination unit 23, a spectral characteristic L30 of the optical filter 27, and a spectral characteristic L40 of the optical filter 28. The spectral characteristic L30 of the optical filter 27 covers the entire emission spectrum distribution L20. That is, the optical filter 27 transmits all the light emitted from the image illumination unit 22. A part of the wavelength region of the emission spectrum distribution L10 of the information illumination unit 23 overlaps the region of the emission spectrum distribution L20 of the image illumination unit 22. However, the optical filter 28 does not transmit light in the overlapping wavelength region, that is, light in a region outside the range of the spectral characteristic L40. Therefore, the wavelength region of the light emitted from the information illumination unit 23 through the filter 28 is a region outside the range of the spectral characteristic L30 of the filter 27, and the light from the information illumination unit 23 is not transmitted to the partial region E1.

  When the digital camera is turned on, that is, when only information is displayed on the LCD 21, only the information illumination means 23 is lit. The light emitted from the information illumination means 23 is diffused by the refracting portion 25a of the diffusion plate 25 through the optical filter 28, and enters the information display area E2 from the oblique direction. A part of the light of the information illumination means 23 incident on the partial area E1 is blocked by the optical filter 27.

  The image illuminating means 22 includes a flat fluorescent tube 22d and a reflecting plate 22e, and emits light above the image illuminating means 22. This light is diffused by the diffusion plate 25, and the image display area E3 of the LCD 21 is illuminated. At this time, information can be displayed in the information display area E2 so as to be superimposed on the image.

  When an image is displayed in the image display area E3 and information is also displayed in the information display area E2, the image illumination means 22 and the information illumination means 23 are turned on. Since the information area E2 is illuminated by the image illumination means 22 and the information illumination means 23, the illuminance is higher than that of the partial area E1. Thus, since the information display area E2 becomes a highlight area, information can be easily confirmed even when an image having a color similar to the displayed information is used as a background.

  When the image illumination means 22 is turned off, the information illumination means 23 is turned on, only the information display area E2 is illuminated, and information is displayed in the information display area E2. The image illuminating means 22 may be an edge light type as in the third embodiment.

  As described above, according to the fourth embodiment, as in the third embodiment, the LCD 21 provided in the digital camera displays the captured or recorded image and information such as date and operation mode. Thus, the number of parts is reduced and the configuration is simplified. Further, when only information is displayed on the LCD 21, the information illumination means 23 is used, so that power consumption can be reduced. Furthermore, since the image display area E3 of the LCD 21 is illuminated by the image illumination means 22, an image can be displayed also in the information display area E2.

  The light emitted from the information illumination unit 23 by the optical filter 27 and the optical filter 28 is incident only on the information display area E2. Therefore, when an image and information are displayed on the LCD 21, the boundary between the partial area E1 and the information display area E2 becomes clear.

  As the light source of the information illumination means 23, a light source whose spectral spectrum wavelength region does not overlap with the wavelength region of the emission spectrum distribution L20 of the image illumination means 22 may be applied. In this case, the filter 28 need not be used.

1 is a perspective view showing a digital camera according to a first embodiment of the present invention. It is a figure which shows the liquid crystal display element of an image display apparatus. It is side sectional drawing which shows an image display apparatus typically. It is a block diagram which shows the digital camera of 1st Embodiment. It is a sectional side view which shows typically the image display apparatus provided in the digital camera of 2nd Embodiment. It is a sectional side view which shows typically the image display apparatus provided in the digital camera of 3rd Embodiment. It is a sectional side view which shows typically the image display apparatus provided in the digital camera of 4th Embodiment. It is a figure which shows the spectral characteristics of the optical filter provided in an image display apparatus.

Explanation of symbols

21 Liquid crystal display element (image display means)
22 Image illumination means 23 Information illumination means E1 Image display area E2 Information display area

Claims (3)

A liquid crystal display device having an image display area for displaying an image based on an image signal corresponding to a subject image read from an image sensor, and an information display area for displaying information different from the image A single image display means;
Image illumination means for illuminating the image display area of the image display means;
Illuminating the information display area of the image display means, information illumination means having lower power consumption than the image illumination means ,
An optical filter that irradiates only the information display area with light emitted by the information illumination means,
A part of the image display area is the information display area,
When the information illumination means displays only information different from the image on the information display area, the image display means illuminates only the information display area via the optical filter,
When the image display means displays the image in the image display area and displays information different from the image in the information display area, the image illumination means illuminates the image display area and the information An image display apparatus for a digital camera, wherein an illuminating means illuminates only the information display area through the optical filter .   2. The image display device for a digital camera according to claim 1, wherein the image illumination means is a fluorescent tube. 2. The image display device of a digital camera according to claim 1, wherein the information illumination means is a light emitting diode.