JPS6145663Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a display device for an electronic viewfinder, and its purpose is to reduce the number of parts and save power by using the light emitted from the fluorescent surface of a cathode ray tube as a light source for the display device. An object of the present invention is to provide an electronic viewfinder that can be made smaller and lighter.

In recent years, there has been a remarkable trend toward smaller and lighter color television cameras (hereinafter referred to as TVs), and the electronic viewfinder that comes with them has also become smaller and lighter. .

In general, this type of electronic viewfinder can display the image of the scene captured by a color TV camera on the fluorescent surface of the CRT, and also display various information such as recording status, battery alarm display, and tally. (TALLY) display and other displays are also often performed.

1 and 2 are a front view and a side sectional view of the CRT portion of a conventional electronic viewfinder, in which 1 is the fluorescent surface of the CRT, 2 is the housing, 3 is the display section using light emitting elements, 4 is a substrate provided with a light emitting element, and 5 is a light emitting element. The display device for various information in this electronic viewfinder is a board 4 installed near the CRT, as shown in the figure.
However, since the substrate 4 on which the light emitting element 5 for display is provided requires a large number of parts, it is necessary to further reduce the size and weight of the electronic viewfinder. It was causing problems in achieving the goal.

Further, there were also drawbacks such as an increase in the number of substrates, leading to higher costs, and increased power consumption.

The present invention eliminates the above-mentioned conventional drawbacks, and the embodiments of the present invention shown in FIGS. 3 to 7 will be described below.

FIG. 3 is a front view of the CRT portion of the electronic viewfinder display device according to the present invention, and FIGS. 4 and 5 are side sectional views showing the main parts thereof, showing two embodiments.

First, as a first embodiment, as shown in FIGS. 3 and 4, a liquid crystal display panel 8 is placed at the upper and lower positions in front of the fluorescent surface 1 of the CRT.
It is installed so as to face the light source section L of the fluorescent surface 1 of the CRT. This light source part L is as shown in Fig. 7.
The upper and lower ends of the fluorescent surface 1 of the CRT are made to emit light. In order to make this light source part L always shine at a constant brightness regardless of the brightness or darkness of the image reflected on the fluorescent surface 1 of the CRT, for example, the vertical blanking period of the composite video signal of the television shown in FIG.
Among A18H to 21H (H: horizontal scanning period, 63.5 μsec), the first 3H period C ₁ and the last 3H period C ₂ ,
That is, the 3H period after the end of the video signal P ₁ of a certain field F ₁ and the video signal P ₂ of the next field F ₂
By adding a signal of the white peak level W to each 3H period immediately before the start of the scanning line 3 on the fluorescent surface 1 of the CRT, the scanning line 3 at the upper and lower edges of the screen is
You can always make your duty shine brightly. At this time, even if the period B in which vertical retrace lines are actually erased is shortened by 6H in total, there is no problem because sufficient time is secured to vertically retrace the scanning lines. In the figure, h is a horizontal synchronizing pulse, and r is a horizontal blanking period.

As shown in the enlarged sectional view of FIG. 6a, the liquid crystal display board 8 described above reflects light from the light source part L of the fluorescent surface 1 of the CRT with a reflecting mirror 9 embedded inside the liquid crystal display board 8. Then, the light is applied to a diffusion mirror 10 provided on the back surface of the liquid crystal display panel 8 to illuminate the liquid crystal display surface 11.

In this way, there is no need for an additional light source to illuminate the liquid crystal display surface, and the display device can be made smaller and lighter.

What is shown in FIG. 5 is another embodiment, in which the CRT
A liquid crystal display panel 8 as shown in FIG. 6b is installed at the upper and lower positions of the front surface around the fluorescent surface 1,
A first reflecting mirror 1 provided at a position facing the light source L of the fluorescent surface 1 of the CRT receives light from the light source L.
2, the light is reflected by a second reflecting mirror 13 provided on the back side of the liquid crystal display panel 8, and illuminates the liquid crystal display surface 11.

In this way, the same effect as in the previous embodiment can be obtained, and the liquid crystal display surface can be illuminated more brightly.

In addition, in each of the above embodiments, the liquid crystal display board was installed at the upper and lower positions of the fluorescent surface of the CRT, but it may be installed only on one of them, or
It can also be installed at one or both sides of the left or right side of the fluorescent surface of the CRT, and if the CRT is a color cathode ray tube, the above white peak level signal within the vertical blanking period of the composite video signal. It is also possible to change the display color of the light source section L by adding an appropriate color signal to the .

As explained above, according to the display device for an electronic viewfinder according to the present invention, in an electronic viewfinder using a cathode ray tube used in a video camera, etc., the liquid crystal display panel displays information other than images appearing on the cathode ray tube. is installed near the fluorescent surface of the cathode ray tube, and the light emitted from this fluorescent surface is irradiated onto the liquid crystal display panel.Therefore, there is no need for any other light source to illuminate the liquid crystal display surface, and the electronic type This has effects such as a reduction in the number of parts of the viewfinder, power saving, and reduction in size and weight, and costs can be reduced accordingly.

Furthermore, since a liquid crystal display board is used as the information display means, it is possible to display fairly complex contents.

[Brief explanation of drawings]

1 and 2 are a front view and a side sectional view of a conventional device of this kind, FIG. 3 is a front view of a CRT portion of an electronic viewfinder using the display device of the present invention, and FIG.
Figure 5 is a side sectional view showing the main parts of the display device of the electronic viewfinder according to the present invention, Figure 6a,
b is an enlarged side sectional view of the liquid crystal display panel of the display device of the present invention, FIG. 7 is a front view showing the position of the light source on the fluorescent surface of the CRT, and FIG. 8 is a composite video signal sent to the CRT of the device of the present invention. FIG. 1... CRT fluorescent surface, 2... Housing, 8...
Liquid crystal display plate, 9...Reflection mirror, 10...Diffusion mirror, 11...Liquid crystal display surface, 12...First reflection mirror, 13...Second reflection mirror, L...Light source section.

Claims (1)

[Scope of utility model registration request] In an electronic viewfinder using a cathode ray tube used in video cameras, etc., a liquid crystal display board that displays information other than images appearing on the cathode ray tube is installed near the fluorescent surface of the cathode ray tube, and this fluorescent surface emits light. 1. A display device for an electronic viewfinder, characterized in that light is irradiated onto the liquid crystal display panel.