JP2842497B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a display device which is arranged in front of eyes for observation.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing the structure of a conventional display device as disclosed in, for example, Japanese Patent Application Laid-Open No. 1-289913. In the figure, 1 is an LCD unit, 2
Is the effective screen of the LCD unit 1, and 3 is the LCD unit 1.
Glass substrate, 4 is a backlight, 5 is an eyepiece, 6
Is a housing, 7 is a shielding plate 7, 8 is a screen restriction window of the LCD unit 1 opened on the shielding plate 7, 9 is a human eye, 10 is an eye cap, 11 is a viewing window, 12 is an internal coating, and 13 is external light. , 14
Is a video signal input terminal.

FIG. 9 is a correlation diagram between a video signal input to the LCD unit 1 in FIG. 8 and a screen image viewed from the human eye 9. A limit line of a visual field to be closely watched without being involved in information retrieval of the brain, 16 is a display screen of the effective screen 2 which is limited by the screen restriction window 8, 17 is a display white portion of the display screen 16,
18 is a display black portion of the display screen 16, 19 is a background of the shielding plate 7, 20 is a video signal waveform input to the LCD input to the LCD unit 1, 21 is a synchronizing signal pulse, 22 is a burst signal, and 23 is a video signal waveform 20. Highest brightness level, 24
Is the lowest luminance level of the video signal waveform 20.

[0004] A conventional imaging device is configured as described above,
For example, the effective screen 2 of the LCD unit 1 is
The virtual image of the image input to the LCD unit 1 from the image signal input terminal 14 through the eyepiece 5 and displayed on the effective screen 2 is shown to the human eye 9. At this time, by setting the screen restriction window 8 of the shielding plate 7 to the same size as the effective screen 2, the light of the backlight 4 passing through the glass substrate 3 is blocked so as not to dazzle the human eyes 9. . Also,
When the inner coating 12 is applied to the inside of the black housing 6 and the black shielding plate 7 by matte coating, the external light 13 is blocked,
Diffuse reflection of light emitted from the effective screen 2 of the LCD unit 1 is suppressed, and the background
Are not obstructed by the light of the effective screen 2. Therefore, for the human eye 9, the highest luminance level 23 of the video signal waveform 20 is like the display white part 17, the lowest luminance level 24 of the video signal waveform 20 is like the display black part 18, and the shielding plate 7 is Black background 1 within the limit line 15
Looks like 9.

[0005]

In the conventional display device as described above, since the external light is blocked, the inside of the housing, that is, the background is completely dark, and the luminance of the background is displayed on the display screen displayed by the display means. When the brightness is lower than the brightness of the display black portion, there is a problem that the display black portion of the display screen of the display means appears to float white.

In addition, there is another problem that since the housing blocks external light, human eyes cannot perceive an external situation, and there is a high danger.

Further, when the luminance ratio between the background and the display screen is high, the contour of the display screen becomes noticeable, which causes a problem of lack of realism.

The present invention has been made in order to solve the above-mentioned problem. The display device is designed so that the white display portion 17 looks whitish and the display black portion 18 looks blackish even if the contrast of the display means is low. Improve image quality,
It is an object of the present invention to obtain a display device that reduces the risk of being caused by the outside world. Still another object is to improve the sense of reality by making the boundary between the background and the display screen inconspicuous.

The display device according to the first invention displays an image.
Screen for inputting an image to be displayed on the screen.
A display means having an image signal input terminal;
A housing accommodating the display means, and the display in the housing.
It is provided in the display direction of the means and corresponds to the screen of the above display means
A shielding plate having a window and a shielding part having a light diffusion effect,
As the screen edge of the display means approaches the image signal,
Changes the brightness of the video according to the video signal input from the
And a fade means capable of
Sign.

A display device according to a second aspect displays an image.
Screen for inputting an image to be displayed on the screen.
A display means having an image signal input terminal;
A housing accommodating the display means, and the display in the housing.
It is provided in the display direction of the means and corresponds to the screen of the above display means
A shielding plate having a window and a shielding portion whose brightness can be adjusted,
As the screen edge of the display means approaches the image signal,
Changes the brightness of the video according to the video signal input from the
And a fade means capable of
Sign.

The display device according to the third aspect of the present invention is, for example, provided with a housing for illuminating the shielding plate by taking in external light so that human eyes can perceive an external situation. The brightness can be changed, and has the following elements. a) display means having a screen for displaying an image; b) a housing for receiving the external light and accommodating the display means; c) provided in the housing in a display direction of the display means, and provided by the housing. A shield plate that can change the brightness using the light taken in.

[0012] Also, the display device according to the present invention, in order to enhance the realism and inconspicuous the boundary of the display screen and the background, for example, in the vicinity of the display screen edge video signal of a screen display of the display means, Fade means for smoothly changing the luminance of the display screen toward the end of the display screen so as to become the luminance of the shielding plate is provided.

The display device according to another aspect of the present invention is, for example, transparent near the center of the screen displayed by the display means and transparent near the edge of the display screen in order to make the boundary between the display screen and the background inconspicuous and enhance the sense of reality. The filter uses a filter in which the amount of light reduction increases smoothly toward the end and becomes equal to the amount of light reduction of the shielding plate at the screen end.

[0014]

In the display device according to the first aspect of the present invention, since the shielding portion of the shielding plate has a light diffusion effect, the white display portion 17 of the display means looks whitish and the display black portion even if the contrast of the display means is low. Numeral 18 makes the image look darker and works to improve the image quality of the display device.

According to the second aspect of the present invention, since the brightness of the shielding plate can be adjusted, the image quality of the display device is improved.

In the display device according to the third aspect of the present invention, since the housing for taking in external light and illuminating the shielding plate is mounted, human eyes can perceive an external situation.

Further, the display device according to the first and second aspects of the present invention includes:
By using the fade hand stage, it serves to enhance the sense of realism inconspicuous the contour of the display screen and the background.

[0018]

[Embodiment 1] FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention, wherein 1 to 6 and 8 to 14 are the same as those of the above-mentioned conventional apparatus. Numeral 30 denotes a translucent gray shielding plate. The figure shows a display device in which the display white portion is whitish and the display black portion is blackish to be seen by human eyes.

FIG. 2 shows an embodiment of the present invention.
FIG. 14 is a correlation diagram between a video signal input to the CD unit 1 (display means) and a screen image viewed from the human eye 9; 15 to 18 and 20 to 24 are the same as those of the above-described conventional device. Reference numeral 40 denotes a background having an arbitrary luminance when the translucent gray shielding plate 30 is viewed from the eyes 9 therebetween.
The case where the luminance of 0 is set to a luminance substantially intermediate between the maximum luminance and the minimum luminance that can be displayed on the effective screen 2 of the LCD unit 1 is shown.

In the display device configured as described above, for example, the effective screen 2 of the LCD unit 1 is illuminated by the backlight 4 and the video signal input terminal 1 is illuminated by the eyepiece 5.
The virtual image of the image input from the LCD unit 4 to the LCD unit 1 and displayed on the effective screen 2 is shown to human eyes 9. At this time, the screen limiting window 8 of the translucent and gray shielding plate 30 has the same size as the effective screen 2, and the backlight 4 passing through the glass substrate 3
When the translucent gray shielding plate 30 is illuminated with the light of the above, the translucent gray shielding plate 30 looks to the human eye 9 as a background 40 having an arbitrary luminance.

Further, when the internal coating 12 is applied to the inside of the black housing 6 and the translucent gray shielding plate 30 by matte coating and the external light 13 is blocked, the light emitted from the effective screen 2 of the LCD unit 1 is reduced. Display screen 1 with diffuse reflection suppressed
The background 40 that is visible in areas other than 6 is not obstructed by the light of the effective screen 2. Therefore, the human eye 9
The highest luminance level 23 of the video signal waveform 20 is the lowest luminance level 2
4 looks like a display black portion 18.

As described above, according to the display device of the embodiment, the shielding plate has the transparent window having a size substantially equal to the effective screen of the display element, and has the translucent gray shielding portion having the light diffusion effect. However, in order to set the luminance of the shielding plate to an arbitrary luminance value between the maximum luminance and the minimum luminance of the display element with the light guided from the illumination lamp, even if the contrast of the display element is low, the white display portion of the image is displayed. It looks whitish and the black display portion looks blackish, so that good image quality can be obtained.

Embodiment 2 FIG. FIG. 3 is a sectional view showing the structure of one embodiment of the present invention, wherein reference numerals 1 to 6 and 8 to 14 are exactly the same as those of the conventional device. Reference numeral 31 denotes a liquid crystal light valve plate, 32 denotes a variable voltage source, and 33 denotes a variable resistor. The figure shows a display device capable of arbitrarily adjusting the transmittance of the liquid crystal light valve plate 31. The screen image viewed from the human eye 9 will be described with reference to FIG.

In the display device configured as described above, for example, the backlight 4 illuminates the effective screen 2 of the LCD unit 1 and the eyepiece 5 illuminates the video signal input terminal 1.
The virtual image of the image input from the LCD unit 4 to the LCD unit 1 and displayed on the effective screen 2 is shown to human eyes 9. At this time, the screen restriction window 8 of the liquid crystal light valve plate 31 has the same size as the effective screen 2 and the backlight 4 passing through the glass substrate 3
The liquid crystal light valve plate 31 is illuminated with the above light, and the variable resistor 33 adjusts the variable voltage source 32 so that the luminance of the liquid crystal light valve plate 31 is substantially intermediate between the maximum luminance and the minimum luminance of the effective screen 2. Then, the liquid crystal light valve plate 31 appears to the human eye 9 as a background 40 having an arbitrary brightness as shown in FIG.

Further, the inner coating 12 is applied to the inside of the black housing 6 and the liquid crystal light valve plate 31 by matte coating.
When the external light 13 is blocked, the effective screen 2 of the LCD unit 1 is
The irregular reflection of the light emitted from the display screen 16 is suppressed, so that the background 40 visible outside the display screen 16 is not obstructed by the light of the effective screen 2. Therefore, to the human eye 9, the highest luminance level 23 of the video signal waveform 20 looks like a display white portion 17, and the lowest luminance level 24 of the video signal waveform 20 looks like a display black portion 18.

As described above, according to this embodiment, since the shielding portion of the shielding plate is formed by the dimming device, the brightness of the shielding portion can be not only between the maximum brightness and the minimum brightness of the display element but also. The brightness of the background 40 can be freely changed according to the requirements of the viewer.

Embodiment 3 FIG. FIG. 4 is a cross-sectional view showing the configuration of an embodiment of the third invention, wherein 1 to 5 and 8 to 14 are exactly the same as those of the conventional device. Reference numeral 34 denotes a translucent and gray housing, and the figure shows a display device in which a part of the external light 13 is introduced into the translucent and gray housing 34.

In the display device configured as described above, for example, the effective screen 2 of the LCD unit 1 is illuminated by the backlight 4 and the video signal input terminal 1 is illuminated by the eyepiece 5.
The virtual image of the image input from the LCD unit 4 to the LCD unit 1 and displayed on the effective screen 2 is shown to human eyes 9. At this time, the screen limiting window 8 of the translucent and gray shielding plate 30 has the same size as the effective screen 2, and the backlight 4 passing through the glass substrate 3
When the translucent gray shielding plate 30 is illuminated by the light of the above, the translucent gray shielding plate 30 looks to the human eye 9 as a background 40 having an arbitrary brightness as shown in FIG. Furthermore, external light 13
Passes through the translucent and gray housing 34 and is diffused to reach the translucent and gray shielding plate 30, and due to a sudden factor in the outside of the translucent and gray housing 34, the brightness of the external light 13 When the color changes, the reflected light of the external light 13 that shines on the translucent and gray shielding plate 30 changes, so that the luminance of the background 40 having an arbitrary luminance changes and the human eye 9 becomes translucent and gray. It is possible to notice a change in the external environment of the housing 34.

Embodiment 4 FIG. FIG. 5 is a cross-sectional view showing the structure of an embodiment of the fourth invention, wherein 1 to 6 and 8 to 14 are exactly the same as the above-mentioned conventional device. 50 is a sync separation circuit, 51 is a YC separation circuit, 52 is a multiplication circuit, 53 is an addition circuit, 54 is a YC mixing circuit, and 55 generates a relatively fine pulse in synchronization with a synchronization signal output from the synchronization separation circuit 50. The synchronizing pulse generating circuit 56
An amplitude level signal generating circuit for generating a control signal having an arbitrary waveform for controlling the amplitude of the video signal; a DC level control signal generating circuit for generating a control signal having an arbitrary waveform for controlling the DC level of the video signal waveform; 58 is 50-57
This figure shows a display device that makes the boundary between the display screen 16 and the background 40 having an arbitrary brightness in the horizontal direction inconspicuous.

FIG. 6 shows an embodiment of the present invention.
FIG. 4 is a correlation diagram between a video signal input to the DC unit 1 and a screen image viewed from the human eye 9; 15 to 18 and 20 to 24 are exactly the same as those in the above-described conventional device. 60 is an amplitude control signal generated from the amplitude level signal generation circuit 56;
Reference numeral 61 denotes an amplitude-limited video signal obtained by multiplying the video signal waveform 20 by the amplitude control signal 60; 62, a DC level control signal output from the DC level control signal generation circuit 57;
Is a video signal after DC level control obtained by adding the DC level control signal 62 to the video signal waveform 20, and 64 is the background luminance level of the video signal in which the luminance of the effective screen 2 of the LCD unit 1 is the same as the luminance of the background 40 This figure shows a case where the luminance signal processing for fading at the screen edge is performed only in the horizontal direction.

In the display device configured as described above, the video signal waveform 2 input from the video signal input terminal 14
0 is synchronously separated by a sync separation circuit 50 and further separated into a luminance signal Y and a chrominance signal C by a YC separation circuit 51.
Enter 2 Here, the synchronization pulse generation circuit 55 generates a continuous pulse at a timing synchronized with the synchronization signal separated by the synchronization separation circuit 50, and the amplitude level signal generation circuit 5
In step 6, an amplitude control signal 60 having a waveform arbitrarily set according to the pulse count value is output to the multiplying circuit 52, and the amplitude levels of the luminance signal and the chrominance signal are controlled so that the luminance signal becomes Become like

Further, the DC level limiting signal generating circuit 57 generates a DC level control signal 62 in accordance with the count value of the continuous pulse generated by the synchronizing pulse generating circuit 55, and the adding circuit 53 controls the amplitude after limiting the amplitude output from the multiplying circuit 52. A DC level control signal 62 is added to the video signal 61, and the luminance signal and the chrominance signal are mixed by the YC mixing circuit 54 to obtain a video signal 63 after DC level control.

That is, the video signal waveform 20 input from the video signal input terminal 14 is converted into the video signal 63 after DC level control by the screen edge fade circuit 58, and the minimum luminance level 24 of the video signal is The highest luminance level 23 of the video signal which is smoothly raised is smoothly lowered at both ends. Therefore, the screen image viewed from the human eyes is such that the display white portion 17 and the display black portion 18 approach the luminance of the background 40 having an arbitrary luminance as the display image 16 approaches the horizontal edge of the screen near the screen edge. This makes it difficult for the human eye 9 to determine the horizontal boundary between the display screen 16 and the background 40 having an arbitrary luminance.

As described above, according to the display apparatus of the fourth embodiment, the level of the level is changed from 1 to 0 as the video signal multiplication circuit and the addition circuit are provided near the display screen edge.
A video peak level suppression signal generation circuit that generates a control signal that smoothly changes to the multiplication circuit, and a DC level at which the display screen luminance becomes the luminance of the shielding plate from 0 so that the display screen luminance is near the display screen edge. A fading DC level control signal generating circuit for generating a DC level control signal which smoothly changes up to the output of the multiplying circuit to the adder circuit. Is suppressed, and a highly realistic image is obtained.

Embodiment 5 FIG. Fourth Embodiment In the fourth embodiment, an example in which the display device according to claim 4 is used for an imaging device has been described.
Any display device having an image may be used. Also, the place of fading is not limited to both screen ends, but may be one side.

Embodiment 6 FIG. FIG. 7 is a sectional view showing the configuration of an embodiment of the fifth invention, wherein 1 to 6 and 8 to 14 are the same as those of the above-mentioned conventional apparatus. 35 is a screen edge extinction filter 3
5 shows a display device that makes the boundary between the display screen 16 and the background 40 having an arbitrary luminance less noticeable in the horizontal direction.

In the display device configured as described above, the video signal waveform 20 input from the video signal input terminal 14 is displayed on the effective screen 2 and the screen edge dimming filter 35
As shown in the limit line 15 of the visual field in FIG. 6, the display white portion 17 and the display black portion 18 are arbitrary near the screen edge as approaching the horizontal edge of the screen as shown in the limit line 15 of the visual field through the eyepiece 5. The luminance of the background 40 having the luminance of, and it becomes difficult for the human eyes 9 to determine the horizontal boundary between the display screen 16 and the background 40 having the arbitrary luminance.

As described above, in the sixth embodiment, the amount of light reduction is smoothly increased near the center of the screen and near the edge of the display screen so that the amount of light reduction increases smoothly. With the provision of the dynamic filter (filter), the boundary between the background and the display screen becomes inconspicuous.

Embodiment 7 FIG. In the first embodiment, the shielding plate is made of a translucent and gray material. However, the same effect can be obtained by using a glass plate or a transparent resin plate on which a dimming material is printed or deposited.

Embodiment 8 FIG. In the first embodiment, the LCD unit 1 is used as the two-dimensional display element.
The same effect can be obtained by using a two-dimensional display element using another transmission type light modulation element such as an LZT sintered body.

Embodiment 9 FIG. In Examples 1 to 6,
Even though the two-dimensional display element is illuminated from the back to the transmissive element and the shielding plate, the reflection-type two-dimensional display element is illuminated from the front to adjust the reflectivity of the shielding plate. Has the effect of

Embodiment 10 FIG. In the fourth to sixth embodiments, the fade processing of the video signal at the screen edge is shown only in the horizontal direction. 9 makes it difficult to determine the vertical boundary between the display screen 16 and the background 40 having an arbitrary luminance.

Embodiment 11 FIG. Examples 1 to 10
In the above, a case has been described in which the present invention is applied to a display device for viewing an LCD through an eyepiece, but it goes without saying that the present invention can also be used for a display device without an eyepiece.

[0044]

As described above, according to the first and second aspects of the invention, it is possible to obtain a display device in which the image quality is hardly deteriorated even if the contrast of the display means is low.

According to the third aspect of the present invention, since the housing allows the outside light to pass through, human eyes can easily perceive the external situation of the housing, and the danger caused by external factors can be reduced.

Further, according to the first and second aspects of the present invention, it is possible to improve the sense of reality when a person looks at the screen by smoothly matching the luminance ratio around the boundary between the background and the display screen. it can.

According to another aspect of the present invention, an increase in power consumption can be suppressed by using an optical filter.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an apparatus configuration according to a first embodiment of the present invention.

FIG. 2 is a correlation diagram between a video signal input to the LCD unit according to the first embodiment of the present invention and a screen image viewed from human eyes.

FIG. 3 is a cross-sectional view illustrating a device configuration according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a device configuration according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing an apparatus configuration according to a fourth embodiment of the present invention.

FIG. 6 is a correlation diagram between a video signal input to an LCD unit according to a fourth embodiment of the present invention and a screen image viewed from human eyes.

FIG. 7 is a sectional view showing an apparatus configuration according to a fifth embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a device configuration of a conventional display device.

FIG. 9 is a correlation diagram between a video signal input to an LCD unit of a conventional display device and a screen image viewed from human eyes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 2D display element 2 Effective screen 4 Illumination lamp 6 Housing which blocks external light 8 Window 13 External light 16 Display screen 20 Video signal 30 Translucent and gray shielding plate 31 Dimming element 34 Translucent housing 35 Optical Filter 52 Multiplication circuit 53 Addition circuit 56 Video peak level suppression signal generation circuit 57 DC level control signal generation circuit 58 Screen edge fade circuit 60 Control signal 62 DC level control signal 64 DC level which becomes luminance of shielding plate

Continuation of front page (56) References JP-A-2-1577893 (JP, A) JP-A-49-75350 (JP, A) JP-A-4-329589 (JP, A) (58) Fields studied (Int .Cl. ⁶ , DB name) G02F 1/1333 G02B 27/02 G02F 1/1335 G09F 9/00 315 G09F 9/00 318

Claims (3)

(57) [Claims] 1. A screen for displaying an image, wherein the screen includes
Display having a video signal input terminal for inputting video to be displayed
Means, a housing for housing the display means for blocking external light, and a housing provided in the housing in a display direction of the display means,
Window corresponding to the screen of the display means and shielding with light diffusion effect
A video signal as the screen edge of the display means is increased.
Changes the brightness of the video according to the video signal input from the
Display device having fade means capable of
Place. 2. A screen for displaying an image, wherein said screen is displayed.
Display having a video signal input terminal for inputting video to be displayed
Means, a housing for housing the display means for blocking external light, and a housing provided in the housing in a display direction of the display means,
Window corresponding to the screen of the display means and shielding with adjustable brightness
A video signal as the screen edge of the display means is increased.
Changes the brightness of the video according to the video signal input from the
Display device having fade means capable of
Place. 3. A display device having the following elements: a) display means having a screen for displaying an image; b) a housing for receiving the display means by taking in a part of external light; c) in the housing, A shielding plate provided in a display direction of the display means and capable of changing luminance by using light taken in by the housing;