JPH09185116A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device constituted so that character information moved and displayed can be surely read without causing an observer to feel unpleasant. SOLUTION: The line of sight of the observer who gazes the character information displayed in a state where it is moved from a 1st coordinate position to a 2nd coordinate position on a screen is detected by a line-of-sight detection means 106, and the moving speed of the character information displayed on the screen is changed by a CPU 111 in accordance with relation between the coordinate position of the gazing point on the screen, and the 1st coordinate position and the 2nd coordinate position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a head mounted display, a viewfinder of a video camera, a viewfinder of a still camera.

[0002]

2. Description of the Related Art Heretofore, in this type of display device, various methods have been proposed for detecting the line of sight of an observer who is gazing at character information displayed on a screen.

One of them will be described with reference to FIGS.

FIG. 7 is a schematic diagram of an eyeball image projected on the image sensor, FIG. 8 is an output intensity diagram of the image sensor, and FIG.
Is a top view showing the principle of the line-of-sight detection method, and FIG. 10 is a side view of the same.

In FIGS. 9 and 10, 806a, 80
Reference numeral 6b denotes a light source such as a light emitting diode (IRED) that emits infrared light that is insensitive to the observer.
806b is arranged substantially symmetrically with respect to the optical axis of the imaging lens 811 in the x direction (horizontal direction) as shown in FIG. 9 and slightly downward in the y direction (vertical direction) as shown in FIG. Thus, the eyeball 808 of the observer is divergently illuminated. The eyeball 8
A part of the illumination light reflected by 08 is imaged on the image sensor 812 by the imaging lens 811.

Next, a method of detecting the line of sight will be described with reference to FIGS.

First, considering the horizontal plane, FIG. 9 and FIG.
The infrared light emitted from one of the light sources 806b in
Illuminate the cornea 810 of the observer's eye 808. At this time, the corneal reflection image (virtual image) d formed by the infrared light reflected on the surface of the cornea 810 is the imaging lens 8 of FIGS. 9 and 10.
It is condensed by 11 and forms an image at a position d ′ on the image sensor 812. Similarly, the infrared light emitted from the other light source 806a illuminates the cornea 810 of the eyeball. At this time, the cornea reflection image (virtual image) e formed by the infrared light reflected on the surface of the cornea 810 is condensed by the imaging lens 811, and is imaged at the position e ′ on the image sensor 812. Light fluxes from the ends a and b of the iris 804 are formed by the imaging lens 81.
The images of the end portions a and b are formed at the positions a ′ and b ′ on the image sensor 812 via 1. When the rotation angle θ of the optical axis of the eyeball 808 with respect to the optical axis of the imaging lens 811, is small, and the x coordinates of the ends a and b of the iris 804 are xa and xb,
A large number of points xa and xb can be obtained on the image sensor 812 (x mark a in FIG. 7). Therefore, first, the pupil center xc803 is calculated by the method of least squares of the circle.

On the other hand, when the x coordinate of the center of curvature o of the cornea 810 is xo, the rotation angle θx of the eyeball 808 with respect to the optical axis.
Is expressed by the following equation (1).

Oc * sin θx = xc−xo (1) Further, a predetermined correction value δx is set at the midpoint k between the corneal reflection images d and e.
When xo is calculated in consideration of, the following equation (2) is obtained.

Xk = (xd + xe) / 2 xo = (xd + xe) / 2 + δx (2) where δx is a numerical value geometrically obtained from the installation method of the device / eyeball distance and the like, and the calculation method is omitted. .
Therefore, when the rotation angle θx is obtained by substituting the equation (1) into the equation (2), the following equation (3) is obtained.

Θx = arcsin [[xc − {(xd + xe) / 2 + δx}] / oc] (3) Furthermore, the symbol of the coordinates of each feature point projected on the image sensor 812 of FIGS. 9 and 10 is “ When rewritten with ‘’, the following equation (4) is obtained.

Θx = arcsin [[xc ′ − {(xd ′ + xe ′) / 2 + δx ′}] / oc / β] (4) where β is the value of the eyeball for the imaging lens 811 in FIGS. 9 and 10. It is a magnification determined by the distance sze, and is actually obtained as a function of the interval | xd'-xe '| of corneal reflection images.

Considering the vertical plane, the configurations shown in FIGS. 9 and 10 are obtained. Here, two IREDs 806a and 806b
The corneal reflection image generated by is generated at the same position, and this is designated as i. The method of calculating the rotation angle θy of the eyeball is almost the same as that for the horizontal plane, but only the above formula (2) is different, and when the y coordinate of the corneal curvature center o is yo, the following formula (5) is obtained.

Yo = yi + δy (5) Here, δy is a numerical value obtained geometrically from the arrangement method of the device, the eyeball distance, etc., and the calculation method is omitted. Therefore, the rotation angle θy in the vertical direction is given by the following expression (6).

Θy = arcsin [[yc ′ − (yi ′ + δy ′)] / oc / β] (6)

Further, in the case of a viewfinder of a video camera,
When the constant m determined by the finder optical system is used, the position coordinates (xn, yn) on the screen are given by the following equations (7) and (8) on a horizontal plane and a vertical plane, respectively.

Xn = m * arcsin [[xc '-{(xd' + xe ') / 2 + δx'}] / oc / β] (7) yn = m * arcsin [[yc '-(yi' + δy ')] / Oc / β] (8) As is clear from FIGS. 7 to 10, the detection of the pupil edge uses the rising edge xb ′ and the falling edge xa ′ of the output waveform of the image sensor 812. In addition, the coordinates of the corneal reflection image utilize the sharp rising portions xe 'and xd'.

Next, a personal computer (personal computer) using the gaze detection function as a pointing device
The head mounted display of 1 will be described with reference to FIGS. 11 and 12.

FIG. 11 is a block diagram showing the structure of a head mounted display. In FIG. 11, reference numeral 1110 is a head mounted display unit, which is shaped like goggles, glasses, etc. and is fixed near the eyes of the user. It is like this. Reference numeral 1108 denotes a liquid crystal display element, 11
A liquid crystal display circuit 09 displays the personal computer screen. Further, 1107 is a special prism, 1101 is an observer's eye, and the liquid crystal screen is enlarged by the prism 1107 to be observed by the observer's eye 1101.

The prism 1107 has a first optical action surface a, a second optical action surface b, and a third optical action surface c,
The observation optical system has a positive refractive power as a whole. Reference numeral 1102 denotes an infrared light emitting diode that illuminates the eyeball, 1
Reference numeral 103 denotes an image forming lens system for reducing and forming an eye 1101 and a cornea reflection image of an observer, and includes lenses 1103a and 1103b. An image sensor 1104 detects the image. The second optical surface b of the prism 1107 is inclined in the vertical direction of the observer's eye 1101, and the liquid crystal display element 1108 is above (or below) the observer's eye 1101.
Are located in

FIG. 12 is a side view of the prism 1107 as seen from the second optical action surface b. The second optical action surface b is provided with a reflection layer (hatched portion) for reflecting light. The opening A is open in the center. Two infrared light emitting diodes 1102 are arranged symmetrically with respect to a plane including the optical axis and parallel to the paper surface, and at least one pair of light sources are arranged so as to illuminate the eye 1101 of the observer from below the eye 1101 of the observer. Has been done.

Next, the optical function of the observation optical system will be described.

The light from the liquid crystal display element 1108 is refracted and transmitted by the third optical action surface c of the prism 1107, is totally reflected by the first optical action surface a in the prism, and is reflected by the second optical action surface b of the prism. The divergence angle (convergence angle, convergence angle, which is reflected by the reflective layer, is refracted and transmitted again through the first optical action surface a, and is adapted to the diopter of the observer.
It becomes a (parallel) light flux and is emitted to the observer's eye 1101 side. Here, the observer's eyes 1101 and the liquid crystal display element 11 are
A line connecting the centers of 08 is shown as a basic optical axis L. The liquid crystal display element 11 is used to adjust the diopter of the observer.
This is possible by translating 08 along the optical axis of the prism 1107.

Next, the optical function of the line-of-sight detection system will be described.

The light emitted from the infrared light emitting diode 1102 is observed by the observer's eye 1 from a direction different from the optical axis of the visual axis detection system.
Illuminate 101. The illumination light is reflected and scattered by the cornea and the pupil of the observer's eye 1101, the light reflected by the cornea forms a corneal reflection image, and the light scattered by the pupil forms a pupil image. These lights are imaged on the image sensor 1104 by the imaging lens system 1103 through the opening A provided on the second optical action surface b of the prism 1107. And
The observer's eyes 1101 obtained from the image sensor 1104
In this image, the gazing point data is output to the personal computer unit 1120, which will be described later, by the visual axis detecting circuit 1105 configured according to the above-described visual axis detecting principle.

In the prism 1107, it is desirable that the three working surfaces a, b, and c are each formed by a three-dimensional curved surface having no axis of rotational symmetry in order to correct the image performance and distortion and to make a telecentric system. Here, a curved surface structure including the basic optical axis L and symmetric only with respect to a plane parallel to the paper surface is used.

One lens 11 of the imaging lens system 1103
Reference numeral 03a is a wedge-shaped lens, which makes it possible to configure the imaging lens system 1103 with a small number of lenses, which is suitable for downsizing. By imparting a curvature to the oblique surface of the lens 1103a, it is possible to effectively correct the decentering aberration generated on the second optical action surface b of the prism 1107. Furthermore, providing at least one aspherical surface in the imaging lens system 1103 is effective in correcting the off-axis imaging performance. The diaphragm of the imaging lens system 1103 is a prism 110.
7 is closer to the opening A provided on the second optical action surface b, it is possible to make the opening A smaller, which is effective in preventing a hollow portion in the observation optical system. It is desirable to do it. When the opening A is set to be smaller than 2 mm, it becomes smaller than the pupil of the eye 1101 of the observer, and it is effective to prevent the hollow portion in the observation optical system. In addition, the light that illuminates the observer's eyes 1101 is
Infrared light is used because light with low visibility is good. In this case, if at least one lens 1103b made of a member that cuts visible light is provided in the imaging lens system 1103,
It is possible to improve the detection accuracy of the line of sight.

Further, when the illumination light source is arranged on the side opposite to the observer's eyes 1101 with the prism 1107 interposed therebetween, the refractive power of the prism 1107 becomes strong, and even when the field of view is increased,
This is desirable because the eyes 1101 of the observer can be appropriately illuminated. In this case, the opening A is provided in the light source portion of the reflective layer of the second optical action surface b of the prism 1107. The light emitted from the infrared light emitting diode 1102 passes through the opening A of the second optical surface b of the prism 1107,
The eye 1101 of the observer is illuminated from a direction different from the optical axis of the visual axis detection system through the first optical action surface a.

Next, the personal computer unit 1120 will be described. In FIG. 11, reference numeral 1120 is a personal computer unit, and 1114 is a CPU (central processing unit), which performs arithmetic processing of programs and data. 11
13 is a system bus connecting the devices, 1118 is R
A memory controller 1112 for controlling the OM (read only memory) 1116 and the RAM (read / write memory) 1117 is a video graphic controller for controlling the contents written in the video RAM 1111 to be displayed on the display. Reference numeral 1115 denotes an accessory / device controller for controlling a pointing device or a keyboard, which is connected to the line-of-sight detection circuit 1105 of the head mounted display 1110 in this embodiment. Reference numeral 1119 denotes an I / O channel for controlling peripheral devices, and in this embodiment, the head mounted display 1
It is connected to the liquid crystal display circuit 1109 of 110. Also, 1
121 is a character controller and 1122 is an interface.

Here, the head mounted display 11
The menu selection function of the personal computer using the line-of-sight pointing device mounted on the personal computer 10 will be described with reference to FIG.

FIG. 13 shows a screen seen when the observer wears the head mounted display 1301.
02 is a menu selection display range, 1303, 1304, 1
Reference numeral 305 denotes a menu display, and α, β, and γ are coordinate group ranges for gaze determination corresponding to the respective menu displays 1303 to 1305. The observer displays the menu display 1303,
By watching 1304 and 1305 for a certain period of time,
The function corresponding to each menu display can be executed.

Next, the operation of the CPU 1114 at the time of the function of the line-of-sight pointing device will be specifically described with reference to the flowchart of FIG. A coordinate group in a predetermined range including the index of each line-of-sight switch is RO in FIG.
It is stored in M1116, and each coordinate group is shown in FIG.
All the coordinates of the ranges α, β, and γ shown in 3 are included.

First, when the power is turned on in step S1401, variables l, m, and
n is reset to 0 and ready. Variables l, m, n
Is the coordinate at which the observer's point of gaze is in the range α,
It is a variable that counts the number of times that any coordinates in the range β and any coordinates in the range γ match. Next, step S
In 1403, the CPU 1114 of FIG. 11 continuously receives the gazing point coordinate ranges α, β, γ on the finder of the observer from the visual line detection circuit 1105 while the observer looks into the screen and the visual line detection is normally performed. .

Now, a case where the observer sees the menu display 1303 of the menu A in FIG. 13 will be described. When the coordinates of the gazing point substantially match any of the coordinates in the range α (step S1404), the variables m and n are reset to 0 in step S1405, and l is larger than a predetermined number (five in this embodiment). Whether or not it is determined in step S1406, and if less, 1 is added to 1 in step S1408, and step S1 is performed again.
At 409, it is determined whether or not l is larger than 5, and if it is smaller, the process returns to step S1403, and the line-of-sight detection circuit 110 is restarted.
Receives gazing point coordinates from 5.

If it is determined in step S1409 that the number is 5 or more, the A menu is selected in step S1411, and then the process returns to step S1403 to receive the line-of-sight coordinates again. If l is 5 or more in step S1406, steps S1408 and S1 are performed.
409 is skipped, and the process proceeds to step S1411.

Even if any of the coordinates in the range α coincides with the line-of-sight coordinates, the range α falls within five times if they match.
If the coordinates deviate from any of the coordinates even once, steps S1413, S1421, and S142.
At 8 the variable l is reset to 0.

The other menu B menu display 1304 and the menu C menu display 1305 are the same as the menu A menu display 1303 of FIG. 13 described above. The description is omitted.

By the way, recent personal computers are used as multimedia terminals, and various character information can be scroll-displayed on the screen of the personal computer.

The character controller 1121 of FIG.
Is a controller for character data instructed from the CPU 1114 and character data input through the external interface 1122.

Here, the character information is controlled to be scroll-displayed on the display.

FIG. 15 shows a state in which character information scrolls and flows to the lower portion 1505 of the screen of the head mounted display 1301 of FIG. 13 described above, and four time elapses from the screen 1501 to the screen 1504. It represents the process. The character information in the example of FIG. 15 is “abcd
efghijklmnopq. ", Scrolls from the right to the left of the screen and disappears. The part of the screen 1506 is the screen of the game, the screen of the word processor (word processor), or the screen of some other application. The character information flowing on the screen 1505 may be character information for these applications, may appear regardless of these applications, and may disappear by scrolling.

[0042]

As described above, the method for detecting the line of sight of the observer is already known, but the conventional line-of-sight detection method has the following drawbacks.

For example, when trying to detect a line of sight with a head mounted display, the moving speed of the character information scroll-displayed on the screen is constant, and therefore the moving speed of the displayed character information is too fast for some observers. There is a problem that the reading cannot be completed within the period displayed on the screen, and conversely, the moving speed of the displayed character information is too slow depending on the observer, which is uncomfortable.

FIG. 13 shows a display screen on which the observer is gazing, and from the position 1302 to the position 1 at the lower part 1301 of the screen.
Character information is scrolled toward 303. If the moving speed of the text information matches the reading speed of the observer, the observer can read the text information while keeping the gazing point at the position 1304. However, if the moving speed of text information is faster than the reading speed of the observer,
The observer's gazing point gradually moves to the position 1303,
In the end, it becomes unreadable.

When the moving speed of the character information is slower than the reading speed of the observer, the gazing point of the observer gradually moves to the position 1302, and the user feels uncomfortable such as the character information that does not appear easily. become.

The present invention has been made in order to improve the problems of the above-mentioned conventional example, and provides a display device capable of surely reading character information or the like that is moved and displayed without causing the observer to feel uncomfortable. The purpose is.

[0047]

In order to achieve the above object, the display device according to claim 1 of the present invention is a line-of-sight detecting means for detecting the line-of-sight of an observer who gazes at character information displayed on the screen. And when the observer is gazing at the character information or the like displayed while moving from the first coordinate position on the screen to the second coordinate position, the coordinate position on the screen of the gaze point and the And a moving speed changing means for changing the moving speed of the character information or the like according to the relationship between the first coordinate position and the second coordinate position.

In order to achieve the same object, the display device according to claim 2 of the present invention is the display device according to claim 1, in which the coordinate position of the gazing point on the screen is the same as the first coordinate position. If the first coordinate position is closer to the first coordinate position than the intermediate point of the second coordinate position, the moving speed of the character information or the like is increased, and if the second coordinate position is closer than the intermediate point, the moving speed of the character information or the like is decreased. It is a feature.

[0049]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

(First Embodiment) First, a first embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a block diagram showing a configuration of a display device according to a first embodiment of the present invention, FIG. 2 is a side view seen from a second optical surface b of a prism in the display device of FIG. 1, FIG. 3 is an explanatory view showing a screen on the display device, and FIG.
Is a flow chart showing the operation of the display device, and FIG. 5 is an explanatory diagram showing the operation of the memory of the display device.

In FIG. 1, 110 is a head mounted display unit, which is fixed in the vicinity of the user's eyes in the shape of goggles, glasses, or the like. A liquid crystal display element 108 and a liquid crystal display circuit 109 display a personal computer screen. Further, 107 is a special prism, 10
Reference numeral 1 is an observer's eye, and the liquid crystal screen is enlarged by the prism 107 and is observed by the observer's eye 101. The prism 107 is an observation optical system having a first optical action surface a, a second optical action surface b, and a third optical action surface c, and having a positive refracting power as a whole. Further, 102 is an infrared light emitting diode for illuminating the observer's eye 101, 103 is an image forming lens system for forming a reduced image of the observer's eye 101 and a cornea reflection image, and 104 is an image sensor for detecting the image. The second optical surface b of the prism 107 is tilted in the vertical direction of the observer's eyes 101, and the liquid crystal display element 108 is provided.
Is located above (or below) the observer.

FIG. 2 is a side view of the prism 107 as seen from the second optical action surface b. The second optical action surface b is provided with a reflection layer (hatched portion) for reflecting light. An opening A is provided in the central portion. Two infrared light emitting diodes 102 are arranged symmetrically with respect to a plane including the optical axis and parallel to the paper surface, and at least one pair of light sources are arranged so as to illuminate the eye 901 of the observer from below the eye 101 of the observer. Has been done.

Next, the optical function of the observation optical system will be described. The light from the liquid crystal display element 108 is refracted and transmitted by the third optical action surface c of the prism 107, is totally reflected by the first optical action surface a, is reflected by the reflection layer of the second optical action surface b, and is again reflected. The light beam having a divergence angle (convergence angle, parallel) adapted to the diopter of the observer is refracted and transmitted through the first optical action surface a, and the observer's eyes 10
Inject to the 1 side. Here, a line connecting the eyes 101 of the observer and the center of the liquid crystal display element 108 is shown as the basic optical axis L. The liquid crystal display element 10 is used to adjust the diopter of the observer.
This is possible by translating 8 along the optical axis of the prism 107.

FIG. 3 shows a head mounted display 110.
The lower part 302 of the screen 301 shown in the figure is a part in which character information and the like are scroll-displayed as described in the conventional example. In addition, the lower part 302 of this screen 301 is approximately 3
The left side of the equally divided area is the range 303, the right side is the range 304, and the coordinate group on the screen included in the range 303 is L and the range 3
Let R be a coordinate group on the screen included in 04. Then, the coordinate groups L and R are stored in the ROM 116 of FIG. 1 similarly to the index area of the line-of-sight switch described in the conventional example.

The buffer memory 123 shown in FIG. 1 is a memory for temporarily storing character data input through the external interface 122. Character controller 121
Is instructed by the CPU 114, and by controlling the buffer memory 123, the input character information is scroll-displayed on the lower part 202 of the screen from the right end to the left end at a speed according to the position of the gazing point on the screen. It has become.

Next, the operation of the CPU 114 will be described with reference to the flowchart shown in FIG.

First, in step S401, the power is turned on (O
N) and when this processing operation is started, step S40
In step 2, the line of sight of the observer is detected, that is, the position of the gazing point of the observer on the finder screen is detected. This is shown in FIG.
It may also be combined with step S1403 of step 4. Next, it is determined whether or not the coordinates of the gazing point position detected in step S403 match any of the coordinates of the coordinate group in the coordinate group L. If they match, scrolling of the character information is performed in step S404. After instructing the character controller 121 in FIG. 1 to slow down the speed, the process proceeds to step S405. If they do not match in step S403, step S404 is skipped and the process proceeds to step S405.

In step S405, the coordinate group R
It is determined whether or not any one of the coordinates in the coordinate group in FIG. 1 matches, and if they match, in step S406, after instructing the character controller 121 of FIG. 1 to increase the scroll speed of the character information, The procedure returns to step S402. If they do not match in step S405, step S406 is skipped and the process returns to step S402.

The character controller 121 shown in FIG.
Controls the memory 123 to control the external interface 1
The character information input via 22 is sent to the I / O channel 119 at the instructed speed.

The operation of the memory 123 controlled by the character controller 121 when slowing down the scrolling speed of the character information will be described with reference to FIG. In the figure, 501 is a dual port memory, and the input port 502 is inputted with data 503 of character information to be displayed through the external interface 122 of FIG. The interval of the character information data 503 input at this time is T1. This interval T1 is determined by the period of the write strobe clock input from the outside to the terminal 506 at the same time as the character information data. Character information data 50
3 is temporarily stored in the area 504 in the memory 501 and is output from the output port 505 at the character data interval T2, and at the same time, the read strobe clock is output from the external terminal 507. This interval T2 is determined by the read strobe clock, and is a cycle in which the character information moves by a fixed amount on the screen of the display device. That is, when the observer's gazing point coordinates enter the range 303 shown in FIG. 3, T2 is set to T1 <T2, and the scroll display speed is reduced.

On the contrary, when the gazing point coordinates of the observer enter the range 304 shown in FIG. 3 to increase the scroll speed, the cycle of the read strobe clock is shortened (T1> T2).

With the above configuration, the observer can always reliably read the character information moving on the lower portion 302 of the screen 301 of FIG. 3 at a substantially intermediate point of the moving range.

(Second Embodiment) Next, the second embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 6 is a screen of the head mounted display in the display device according to the second embodiment of the present invention. In the second embodiment, a plurality of ranges of gazing point positions on the screen for determining whether scrolling is fast or slow are provided,
The read strobe clock has a longer period as the gazing point is closer to the end of the scroll, and the read strobe clock has a shorter period as the gazing point is toward the beginning of the scroll.

The operation of the display device according to the second embodiment will be described with reference to FIG. A lower portion 602 of the screen 601 is a portion in which the character information is scroll-displayed as described in the first embodiment described above. In the second embodiment, when this part is divided into seven ranges and the gazing point is in the ranges 603, 605, and 607, the scrolling speed is slowed, and the gazing point is in the ranges 604, 606, and 608. If it is, increase the scroll speed.

An example of the correspondence between each range and the scroll speed is shown in the lower part of FIG. The vertical axis represents the cycle of the read strobe clock. The scale 609 has the same cycle as the write strobe clock, and the cycle becomes longer in the order of 610, 611, and 612. On the contrary, 613, 614, 615
The cycle becomes shorter in this order. That is, within the scroll range
The speed of scrolling is decreased as the position of the gazing point approaches the end point of scrolling, and the speed of scrolling is increased as the position of the gazing point approaches the starting point of scrolling.

Since the processing for each read strobe clock is the same as that in the case of the above-described first embodiment, the description thereof is omitted.

With the above arrangement, the observer can always reliably read the character information moving on the screen at the substantially intermediate point of the moving range.

The case of the head mounted display has been described in both the first and second embodiments.
It can also be applied to a display device such as a viewfinder of a video camera or a viewfinder of a still camera.

[0070]

As described above in detail, according to the display device of claim 1 of the present invention, the character information and the like displayed while moving from the first coordinate position to the second coordinate position on the screen are displayed. When the observer is gazing, since the moving speed of the character information and the like changes according to the relationship between the coordinate position on the screen of the gazing point and the first coordinate position and the second coordinate position, The observer can surely read the character information while keeping the gazing point at a predetermined position.

According to the display device of claim 2 of the present invention, when the coordinate position of the gazing point on the screen is closer to the first coordinate position than the midpoint between the first coordinate position and the second coordinate position. Makes the moving speed of the character information etc. faster, and makes the moving speed of the character information etc. slower when it is closer to the second coordinate position than the middle point, so that the observer always reads the character information etc. at the substantially middle point of the moving range. Therefore, it is possible to solve problems such as being unable to keep track of the moving speed of the character information and the like, which makes it impossible to read, and annoying the character information and the like that does not appear easily.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a display device according to a first embodiment of the present invention.

FIG. 2 is a side view seen from a second optical action surface of a prism in the display device.

FIG. 3 is an explanatory diagram showing a display example of a display screen on the display device.

FIG. 4 is a flowchart showing an operation of the display device.

FIG. 5 is an operation explanatory view of a memory provided in the display device.

FIG. 6 is an explanatory diagram showing a display example of a display screen in the display device according to the second embodiment of the present invention.

FIG. 7 is a schematic diagram of an eyeball image projected on an image sensor.

FIG. 8 is a diagram showing an output intensity of the image sensor.

FIG. 9 is a top view illustrating the principle of the line-of-sight detection method.

FIG. 10 is a top view illustrating the principle of the line-of-sight detection method.

FIG. 11 is a block diagram showing a configuration of a conventional display device.

FIG. 12 is a side view of the prism in the conventional display device as viewed from the second optical action surface.

FIG. 13 is an explanatory diagram showing a display example of a line-of-sight menu on the conventional display device.

FIG. 14 is a flowchart showing an operation of the conventional display device.

FIG. 15 is an explanatory diagram showing a display example of a display screen in the conventional display device.

[Explanation of symbols]

 Reference Signs List 101 eye 102 infrared light emitting diode 103 imaging lens 104 image sensor 105 line-of-sight detection circuit (line-of-sight detection means) 106 line-of-sight detection system 107 prism 108 liquid crystal display element (LCD) 109 liquid crystal display circuit 110 head-mounted display unit 111 video RAM 112 video Graphic controller 113 System bus 114 CPU (speed changing means) 115 Accessory device controller 116 ROM 117 RAM 118 Memory controller 119 I / O channel 120 Personal computer unit 121 Character controller 122 External interface 123 Buffer memory

Claims (2)

[Claims] 1. A line-of-sight detecting means for detecting the line of sight of an observer who gazes at character information displayed on the screen, and is displayed while moving from the first coordinate position to the second coordinate position on the screen. When the observer is gazing at the character information or the like, the moving speed of the character information or the like according to the relationship between the coordinate position on the screen of the point of gaze and the first coordinate position and the second coordinate position. And a moving speed changing means for changing the display speed. 2. The coordinate position of the gazing point on the screen is first from the midpoint between the first coordinate position and the second coordinate position.
2. The display device according to claim 1, wherein the moving speed of the character information or the like is increased when the position is close to the coordinate position of the character, and the moving speed of the character information or the like is decreased when the position is closer to the second coordinate position than the intermediate point. .