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US4766423A
Expired / Lapsed
US
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Three-dimensional display apparatus
Assignee: Hitachi Ltd
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Filing: 1987-01-05
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Granted: 1988-08-23
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Expires: 2007-01-05
Abstract
Abstract A cursor moves at a constant velocity in a constant direction in a display space for displaying a three-dimensional image. When two parameters for representing a direction in a three-dimensional space are entered, the cursor changes its direction according to the entered direction at a rate determined by the entered magnitude. When a parameter for changing the velocity is entered, the cursor velocity is changed. It is not necessary to enter a three-dimensional coordinate to control the cursor to reach the desired position, and the manipulation of the cursor is very much simplified.
Inventors
- 👤 Seigo Ono
- 👤 Osamu Ebina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:12
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/033; G06F3/038; G06F3/048; G06F3/0487; G06F3/0489; G06F3/04892; Y; Y10; Y10S; Y10S345/00; Y10S345/949; Y10S345/953
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
147 words
A three-dimensional display device comprising: display means for displaying a cursor as virtually located in a three-dimensional space and as moving in said space according to a velocity vector that can be changed in response to control signals representing said cursor; input means for inputting first parameter signals including two parameters that three-dimensionally define the direction of said velocity vector; control means connected between said display means and said input means for generating said control signals to display the cursor at a position virtually located in said three-dimensional space and with a configuration such that the cursor appears to move at a constant speed in a fixed direction when said parameter signals indicate no change and such that the cursor appears to change its moving direction in a direction and at a rate represented by said first parameter signals when a change occurs in said parameter signals.
Claim 2
Dependent Claim
147 words
A three-dimensional display device comprising: display means for displaying a cursor as virtually located in a three-dimensional space and as moving in said space according to a velocity vector that can be changed in response to control signals representing said cursor; input means for inputting first parameter signals including two parameters that three-dimensionally define the direction of said velocity vector; control means connected between said display means and said input means for generating said control signals to display the cursor at a position virtually located in said three-dimensional space and with a configuration such that the cursor appears to move at a constant speed in a fixed direction when said parameter signals indicate no change and such that the cursor appears to change its moving direction in a direction and at a rate represented by said first parameter signals when a change occurs in said parameter signals.
Claim 3
Dependent Claim
30 words
A three-dimensional display device according to claim 1 wherein said display means displays said cursor on a two-dimensional display as a virtual image in a three-dimensional space by perspective conversion.
Claim 4
Dependent Claim
34 words
A three-dimensional display device according to claim 1 wherein said input means designates two parameters representing rotation angles about two mutually orthogonal axes in a plane normal to the moving direction of said cursor.
Claim 5
Dependent Claim
20 words
A three-dimensional display device according to claim 1 wherein said control means includes a processing unit and a storage unit.
Claim 6
Dependent Claim
26 words
A three-dimensional display device according to claim 4 wherein said storage unit includes a storage for storing parameters for designating said cursor in a three-dimensional space.
Claim 7
Dependent Claim
31 words
A three-dimensional display device according to claim 5 wherein said processing unit periodically calculates a position and a direction of said cursor to effect a new display of the moving cursor.
Claim 8
Dependent Claim
28 words
A three-dimensional display device according to claim 6 wherein said processing unit instructs display of the cursor after converting the data for display on a two-dimensional display means.
Claim 9
Dependent Claim
44 words
A three-dimensional display device according to claim 3 wherein said control means includes means for calculating a conversion matrix to change the direction of movement of the cursor based on said two parameters from said input means and means for holding the result thereof.
Claim 10
Dependent Claim
35 words
A three-dimensional display device according to claim 8 wherein said control means includes means for calculating a new cursor by using a current cursor and said conversion matrix and means for holding the result thereof.
Claim 11
Dependent Claim
25 words
A three-dimensional display device according to claim 3 wherein said input means includes means for inputting another parameter to designate a velocity of the cursor.
Claim 12
Dependent Claim
24 words
A three-dimensional display device according to claim 10 wherein said control means calculates a new cursor based on parameters entered by said input means.
Claim 13
Independent Claim
110 words
A method of controlling display of a cursor in a three-dimensional space, comprising the steps of: displaying a cursor as a moving image located in a three-dimensional space on a display means; supplying first parameter signals from an input device, including two parameter signals representing a three-dimensional change of direction of the movement of said cursor; generating control signals based on said first parameter signals, the control signals controlling the display of said cursor to move said cursor in a constant direction and at a constant speed when said first parameter signals represent no change and to move said cursor to change direction when said first parameter signals are changed.
Claim 14
Independent Claim
110 words
A method of controlling display of a cursor in a three-dimensional space, comprising the steps of: displaying a cursor as a moving image located in a three-dimensional space on a display means; supplying first parameter signals from an input device, including two parameter signals representing a three-dimensional change of direction of the movement of said cursor; generating control signals based on said first parameter signals, the control signals controlling the display of said cursor to move said cursor in a constant direction and at a constant speed when said first parameter signals represent no change and to move said cursor to change direction when said first parameter signals are changed.
Claim 15
Dependent Claim
15 words
A method according to claim 12 further comprising a step for periodically repeating said steps.
Claim 16
Dependent Claim
17 words
A method according to claim 13 wherein said constant direction is a direction of the latest cursor.
Claim 17
Dependent Claim
33 words
A method according to claim 12 further comprising a step for entering a velocity of the cursor, and said generating step determines a position of a new cursor based on the entered velocity.
Claim 18
Dependent Claim
23 words
A method according to claim 12 further comprising a step of perspective-converting data locating said cursor in a three-dimensional space for two-dimensional display.
Claim 19
Dependent Claim
38 words
A method according to claim 12, wherein the supplying of said first parameter signals comprises supplying two signals which represent rotation angles about two mutually orthogonal axes in a plane normal to the moving direction of said cursor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |