JPH0670268A - Spectacle type video display device - Google Patents

Abstract

PURPOSE:To facilitate the viewing of the outside and a panel by attaching an optical sensor to the spectacle lens made of a liquid crystal panel, detecting the quantity of light transmitted through the spectacle lens, and making ratio between the detected light quantity and the luminance of the back light constant. CONSTITUTION:When the outside is bright, the comparators 14 and 15 compare the output signals received from a photodetecting part 12 with the reference voltage 13 via an optical sensor 11 and then both output the signals of H levels. Based on these output signals, a liquid crystal control part 16 adjusts the luminance of the back light 6 and the quantity of light transmitted through a spectacle lens 2 to be a fixed level. Thus a ratio between the transmitted light, liquid crystal display port and the surface luminance is constant. Then an easy-to-see screen is obtained. When the outside is dark, the output signals of both comparators 14 and 15 are becomes L level respectively. Then the quantity of light transmitted through the lens is not kept constant owing to the reduction of the outside light quantity. Therefore they are feed back from the comparators 14 and 15 to the voltage 13, and the luminance of the light 6 is lowered by a back light control part 17 when the ratio of the transmitted light to the surface luminance is not constant. Thus the good balance is secured with the outside light and the easy-to-see screens are secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle-type image display device capable of displaying a video image or a television image and controlling the amount of light passing therethrough in response to external light.

[0002]

2. Description of the Related Art As an eyeglass-type image display device of this type,
The configuration disclosed in Japanese Patent Application Laid-Open No. 4-22919 by the same applicant is well known as a conventional example. In the device of this conventional example, the device is used by mounting it on the face like eyeglasses, a frame of eyeglass type is used, and earphones of the external ear insertion type are used for listening to voice. There is.

A liquid crystal display plate is attached to the inner side of the sunglasses-shaped translucent spectacle lens, and a backlight composed of a surface light emitter is attached to the rear side of the liquid crystal display plate, and the liquid crystal illuminated from the rear side. The display body is configured to be magnified and viewed through a predetermined lens, and the eye can be bent from the lens to see the external state from the spectacle lens.

[0004]

In the image display device of the conventional example, the brightness of the backlight is set regardless of the brightness of external light, and the amount of external light transmitted through the spectacle lens is constant. So, when you look at the liquid crystal display or look at the outside through a spectacle lens, when the outside is dim, you cannot see the outside even if you suddenly bend your eyes and look at the outside. When the light is bright, there is a problem that the liquid crystal display is difficult to see due to the influence of the external light.

Therefore, the conventional example has a problem to be solved by adjusting the illuminance or brightness of the backlight and adjusting the amount of transmitted light of the spectacle lens according to the situation of external light.

[0006]

As a concrete means for solving the above-mentioned problems of the prior art, the present invention provides an eyeglass-type image display device equipped with a backlight and a liquid crystal display section inside an eyeglass lens having a frame. Then, the spectacle lens is formed of a liquid crystal panel in which the amount of transmitted light changes in response to external light, an optical sensor for detecting the amount of transmitted light of the lens is attached to a predetermined position of the spectacle lens, and the optical sensor detects the amount. To provide an eyeglass-type image display device characterized by adjusting the amount of transmitted light of a spectacle lens and the luminance of the backlight based on the amount of transmitted light, and the amount of transmitted light of the spectacle lens and the luminance of the backlight. Is adjusted so that the amount of transmitted light and brightness are within a certain ratio, and the adjustment of the amount of transmitted light of the spectacle lens and the brightness of the backlight is within a certain ratio. When it is no longer, in which the lower the luminance of the backlight.

[0007]

Operation: An optical sensor is attached to a predetermined position of a spectacle lens formed of a liquid crystal panel, the amount of transmitted light of the spectacle lens is detected, and the transmitted light amount and the brightness of the backlight are made to have a constant ratio, whereby the liquid crystal display unit Since the degree of change in the amount of light is small when looking at or looking at the outside, both are easy to see.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in more detail with reference to illustrated embodiments. In FIGS. 1 and 2, reference numeral 1 is a spectacle-type image display device, and a frame is provided on both sides of an eyeglass lens 2 of the image display device. 3 is attached so that it can be attached to the face through the frame.

A device body 4 for displaying an image is attached inside the spectacle lens 2, and the device body 4 is composed of a liquid crystal display section 5 and a backlight 6, and the liquid crystal display section 5 is predetermined. The magnifying lens 7 is used to magnify the image. In addition, the sound and the like can be heard through the earphone 8 of the outer ear mounting type.

A video signal, an audio signal, and electric power for the liquid crystal display section 5 are supplied from a cord 9. A socket 10 is attached to the tip of the cord, and the socket has a predetermined drive or control circuit. V through S
Connected to TR, TV receiver, etc.

As the spectacle lens 2, for example, a nematic white / black liquid crystal lens, that is, a liquid crystal panel is used, and the amount of light transmission can be adjusted by external light. Then, an optical sensor 11 is attached at a predetermined position inside the spectacle lens 2. The detection signal from the optical sensor 11 is also sent to the drive or control circuit S via the code 9.
Entered in.

The drive or control circuit S including the optical sensor 11 is shown in a block diagram in FIG. And as the optical sensor 11 used,
For example, Cds, Photo Tr, Photo Di, etc., which can electrically detect the light quantity, are used.

The drive or control circuit S has a photodetector 12 and a reference voltage 13, and these photodetector 12 and the reference voltage 1
3, two comparison circuits 14 and 15 are connected in parallel, the liquid crystal control unit 16 is connected to the output side of one comparison circuit 14, and the backlight control unit 17 is connected to the output side of the other comparison circuit 15. Are connected respectively.

A control signal from the liquid crystal control unit 16 is output to the liquid crystal panel, that is, the spectacle lens 2, an output signal of the backlight control unit 17 is output as a drive signal of the backlight 6, and both control units are output. The data from 16 and 17 is the reference voltage 13
To be fed back to.

The photodetector 12 receives a signal from the photosensor 11 and outputs a predetermined signal. The output signal (voltage) is input to the comparison circuits 14 and 15, and the comparison circuits 14 and 15 compare the signal (voltage) from the reference voltage 13 and output a plus or minus signal.

Based on this output signal, one side outputs a predetermined signal from the liquid crystal control section 16 to adjust the amount of light transmitted through the spectacle lens 2, and the other side outputs a predetermined signal from the backlight control section 17. Output and adjust the illuminance of the backlight 6.

The graph of FIG. 4 shows the adjustment of the amount of light transmitted to the external light and the adjustment of the illuminance of the backlight in this case. In the graph, a is external light, b is liquid crystal (glass lens) transmitted light, b'is liquid crystal (glass lens) density, and c is surface brightness of the liquid crystal display unit. The liquid crystal concentration is low when the external light a is small, and the external light a
As the amount of light increases, the density increases, and the amount of transmitted light is inversely proportional to that of external light.

The operation will be described with reference to the drive or control circuit of FIG. 3 and the graph of FIG. When the outside is very bright, the light is input from the light sensor 11 and the light detection unit 12
The comparators 14 and 15 respectively compare the signal output from the reference voltage 13 with the reference voltage 13 and output an H level signal.

Based on this H level signal, the liquid crystal control unit 16 controls the liquid crystal density so that the amount of light transmitted through the spectacle lens 2 becomes a substantially constant level. In the light control unit 17, when the brightness of the backlight 6 is controlled to be kept substantially constant, a graph of the surface brightness c of the liquid crystal display unit 5 is obtained.

As described above, when the external light is bright, the brightness of the backlight 6 is maintained substantially constant, and the transmitted light amount of the spectacle lens 2 is adjusted to be substantially constant. And a surface luminance c of the liquid crystal display unit 5 are maintained substantially constant (a parallel line A portion between the liquid crystal transmitted light b and the surface luminance c of the liquid crystal display unit in FIG. 4) to create an easily viewable screen.

On the contrary, when the outside is extremely dark, the brightness of the backlight 6 is kept substantially constant,
Even if the amount of transmitted light of the spectacle lens 2 is maximized, the amount of transmitted light and external light is still small, and the eyes themselves are backlit 6.
The iris has a degree of opening corresponding to the brightness of, and the balance with external light is poor, and when the liquid crystal display unit 5 and the outside are viewed alternately, the difference in the amount of light entering the eye is large and the eye is adversely affected.

Therefore, in such a case, the amount of light detected by the photosensor 11 is small, and therefore the comparison circuit 1 compares the signal output from the photodetection section 12 with the reference voltage 13.
The signals output from 4 and 15 are at L level, and on the one hand, the transmitted light b of the spectacle lens 2 is adjusted to the maximum, but since the amount of external light is still small, the transmitted light b is increased to a constant value. Can no longer be maintained. On the other hand, it is possible to maintain the constant brightness of the backlight 6.

This state is fed back as information from the comparison circuits 14 and 15 to the reference voltage 13, and when the external light a and the transmitted light b are lower than the surface luminance c in the liquid crystal display unit 5, that is, the transmitted light b and the surface luminance. When the ratio with c does not fall within a fixed value, the backlight control unit 17 lowers the brightness of the backlight 6 (inclined line B in FIG. 4) to darken the liquid crystal display unit 5, thereby reducing external light. The brightness of the liquid crystal display unit 5 is adjusted to be eye-friendly in balance with a.

In any case, the amount of external light transmitted through the spectacle lens 2 is detected so that the amount of transmitted light and the surface luminance of the liquid crystal display unit 5, that is, the luminance of the backlight 6 have a constant value ratio. By making the adjustment, a screen that is easy to see is formed, and when the external light becomes extremely dark, the brightness of the backlight 6 is further lowered to make it eye-friendly.

The image display device of the present invention thus constructed not only connects to a VTR or TV to view an image,
It can also be used as a viewfinder for video cameras during VTR shooting. In this case, it can be used away from the camera body, and even if external light is bright or dark, the liquid crystal display unit 5 and the outside can be easily seen, so the eyes do not get tired and the shooting point is not removed. You can shoot.

[0026]

As described above, the spectacle-type image display device according to the present invention is a spectacle-type image display device equipped with a backlight and a liquid crystal display unit inside a spectacle lens having a frame, The spectacle lens is formed of a liquid crystal panel in which the amount of transmitted light changes in response to external light, an optical sensor for detecting the amount of transmitted light of the lens is attached to a predetermined position of the spectacle lens, and the amount of transmitted light detected by the optical sensor is changed. Based on the configuration that adjusts the amount of light transmitted through the spectacle lens and the brightness of the backlight based on the difference between the amounts of light entering the eyes when looking at the screen of the liquid crystal display unit or looking at the outside through the spectacle lens. Since there is little, it has an excellent effect that the screen and the external appearance are easy to see.

Further, the adjustment of the amount of transmitted light of the spectacle lens and the brightness of the backlight is performed so that the amount of transmitted light and the brightness are within a certain ratio, and the amount of transmitted light of the spectacle lens and the brightness of the backlight are adjusted. However, by reducing the brightness of the backlight when it does not fall within a certain ratio, it becomes easier to see the screen and the external appearance, and it is possible to see the whole when connected to a video camera. Therefore, there is an excellent effect that the shooting position and situation can be grasped firmly before shooting.

[Brief description of drawings]

FIG. 1 is a front perspective view of an eyeglass-type image display device according to the present invention.

FIG. 2 is a rear view showing a part of the display device by cutting out.

FIG. 3 is a block diagram of a drive or control circuit used in the display device.

FIG. 4 is a graph showing a light amount adjustment situation in the display device.

[Explanation of symbols]

 1 Glasses type image display device 2 Glasses lens 3 Frame 4 Device body 5 Liquid crystal display unit 6 Backlight 7 Magnifying lens 8 Earphone 9 Code 10 Socket 11 Optical sensor 12 Photodetector unit 13 Reference voltage 14 and 15 Comparison circuit 16 Liquid crystal control unit 17 Backlight control section S drive or control circuit a External light b Transmitted light b'Liquid crystal density c Surface brightness of liquid crystal display section

Claims (3)

[Claims] 1. A spectacles-type image display device equipped with a backlight and a liquid crystal display unit inside a spectacle lens having a frame, the liquid crystal panel in which the amount of light transmitted through the spectacle lens changes in response to external light. And an optical sensor for detecting the amount of transmitted light of the lens is attached to a predetermined position of the spectacle lens, and the amount of transmitted light of the spectacle lens and the brightness of the backlight are adjusted based on the amount of transmitted light detected by the optical sensor. An eyeglass-type image display device characterized by the above. 2. The spectacle-type image display device according to claim 1, wherein the amount of transmitted light of the spectacle lens and the brightness of the backlight are adjusted such that the amount of transmitted light and the brightness are within a certain ratio. 3. The spectacle-type image display device according to claim 1, wherein when the adjustment of the amount of transmitted light of the spectacle lens and the brightness of the backlight does not fall within a certain ratio, the brightness of the backlight is lowered. .