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Multi-display electronic devices having open and closed configurations |
| RE40821 |
Multi-display electronic devices having open and closed configurations
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| Patent Drawings: | |
| Inventor: |
Narayanaswamy, et al. |
| Date Issued: |
July 7, 2009 |
| Application: |
10/289,082 |
| Filed: |
November 6, 2002 |
| Inventors: |
Narayanaswamy; Shankar (Sunnyvale, CA)
Rosenthal; Eugene J. (Edison, NJ)
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| Assignee: |
Alcatel-Lucent USA Inc. (Murray Hill, NJ) |
| Primary Examiner: |
Awad; Amr |
| Assistant Examiner: |
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| Attorney Or Agent: |
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| U.S. Class: |
345/102; 345/173; 345/5; 349/61 |
| Field Of Search: |
345/102; 345/173; 345/4; 345/5; 345/156; 345/104; 349/61 |
| International Class: |
G09G 3/36 |
| U.S Patent Documents: |
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| Foreign Patent Documents: |
195 46 786; 2 260 844 |
| Other References: |
"Internet Search Results", Apr. 3, 1997, 20 pages. cited by other.
"How to Take in Twice as Much Information?", vol. 102, No. 1723, Jun. 1, 1996, p. 452. cited by other. |
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| Abstract: |
A portable or other electronic device has two or more display devices or screens that can be used to display different subsets of image signals. The effect is that the device simulates the display capabilities of devices having much larger screens. The device has an open or active configuration, in which the multiple screens are available for displaying image signals, and a closed or inactive configuration, in which some or all of the multiple screens are folded together or otherwise stowed away to reduce the size of the device for storage and/or carrying. By simulating large-display operations, electronic devices according to the present invention are capable of presenting more useable information to the user than is otherwise possible using prior art devices having a single small screen. |
| Claim: |
What is claimed is:
1. An electronic device comprising: (a) an image generator adapted to generate image signals; (b) one or more display drivers, connected to the image generator and adaptedto receive the image signals from the image generator; and (c) at least three distinct display devices, connected to the one or more display drivers, wherein the electronic device has (1) an open configuration in which .[.first and.]. second .Iadd.andthird .Iaddend.display devices are deployed for displaying different subsets of the image signals and (2) a closed configuration in which a .[.third.]. .Iadd.first .Iaddend.display device is deployed for displaying image signals and the .[.first and.]. second .Iadd.and third .Iaddend.display devices are stowed away and unavailable for displaying image signals, wherein the first and .[.third.]. .Iadd.second .Iaddend.display devices are mounted back-to-back with a single backlighting device located.[.between the first and third display devices.]. .Iadd.behind the third display device .Iaddend.to illuminate (a) the .[.third.]. .Iadd.first .Iaddend.display device when the electronic device is in the closed configuration and (b) the .[.first.]. .Iadd.third .Iaddend.display device when the electronic device is in the open configuration.
2. The invention of claim 1, wherein the electronic device is a portable electronic device.
3. The invention of claim 1, wherein the display devices comprise a first touch-type display device adapted to display a left-hand side of a soft keyboard and a second touch-type display device adapted to display a right-hand side of the softkeyboard.
4. The invention of claim 3, wherein the first touch-type display device is separable from the second touch-type display device to allow the user to select relative positions for the left- and right-hand sides of the soft keyboard.
5. The invention of claim 1, comprising one display driver for all of the display devices.
6. The invention of claim 1, comprising one display driver for each display device.
7. The invention of claim 1, wherein the image generator and the one or more display drivers are implemented on a single processor.
8. The invention of claim 1, wherein the one or more display drivers are implemented in software.
9. The invention of claim 1, wherein the one or more display drivers are implemented in hardware.
10. An electronic device comprising first, second, and third displays, wherein the first and .[.third.]. .Iadd.second .Iaddend.displays are mounted back-to-back, such that: when the device is in a closed configuration, the .[.third.]. .Iadd.first .Iaddend.display is visible to a user and the .[.first and.]. second .Iadd.and third .Iaddend.displaysare hidden from view; and when the device is in an open configuration, the .[.first and.]. second .Iadd.and third .Iaddend.displays arevisible to the user and display different subsets of image signals; and further comprising a backlighting device located behind the .[.first.]. .Iadd.third .Iaddend.display to illuminate the .[.first.]. .Iadd.third .Iaddend.display when the device isin the open configuration, such that, when the device is in the closed configuration, the backlighting means illuminates the .[.third.]. .Iadd.first .Iaddend.display.
11. The invention of claim 10, wherein: when the device is in the open configuration, the device is adapted to operate as a personal digital assistant; and when the device is in the closed configuration, the device is adapted to operate as aportable telephone. |
| Description: |
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to portable and other electronic devices having displays, such as monitors or screens, for the display of text, graphics, and/or video images.
2. Description of the Related Art
One of the drawbacks to portable electronic devices, such as personal digital assistants, cellular telephones, internet access devices, palmtop computers, and even some laptop computers, is that the displays are of limited size. These smalldisplays limit the type of applications that can be run effectively on such devices and/or detract from the quality of the images displayed by such applications. For example, it may be impractical to run software that relies on a graphical userinterface (GUI) on a portable device, because the elements of the GUI on the small screen of the portable device will be too small to be adequately visible.
SUMMARY OF THE INVENTION
The present invention is directed to a portable or other electronic device having two or more display devices or screens that can be used to display different subsets of image signals. The effect is that the device simulates the displaycapabilities of devices having much larger screens. The device has (1) an open or active configuration in which each display device is deployed for displaying a different subset of the image signals and (2) a closed or inactive configuration in whichone or more of the display devices are stowed away and unavailable for displaying image signals. Stowing the display devices away, which reduces the size, e.g., footprint, of the device for storage and/or carrying, means folding them together orotherwise making one or more of them unavailable to display image signals for viewing by the user. By simulating large-display operations, electronic devices according to the present invention are capable of presenting more useable information to theuser than is otherwise possible using prior art devices having a single small screen.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1(a) and 1(b) show perspective views of a portable electronic device that functions as a combined cellular phone/personal digital assistant, according to one embodiment of the present invention;
FIG. 1(c) shows a perspective view of a portable electronic device in the open configuration, according to an alternative embodiment of the present invention;
FIG. 2 shows a block diagram of an electronic device, according to one implementation of the present invention;
FIG. 3 shows a block diagram of an electronic device 300, according to an alternative implementation of the present invention;
FIGS. 4-6 shows portable electronic devices, according to possible embodiments of the present invention.
DETAILED DESCRIPTION
The present invention is directed to portable and other electronic devices that have two or more display devices, e.g., screens, where each display device is adapted to display different subsets of image signals generated by an image generatorand distributed to the display devices by one or more display drivers. The electronic devices have a closed configuration in which one or more of the displays are, for example, stowed away, e.g., folded together, to facilitate the portability and/orstorage of the electronic device.
A display driver is a component that provides an interface between an image generator and a display device, whereby the display driver receives image signals or image generation commands from the image generator and, if necessary, processes thosesignals/commands to generate the signals for display by the display device. This processing may include such image processing functions as color format transformations and image scaling. A display driver may be implemented in any suitable combinationof hardware and software.
FIGS. 1(a) and 1(b) show perspective views of a portable electronic device 100 that functions as a combined cellular phone/personal digital assistant, according to one embodiment of the present invention. FIG. 1(a) shows device 100 in its closedconfiguration, while FIG. 1(b) shows device 100 in a partially open configuration.
Device 100 has three distinct displays 102, 104, and 106. Display 102 displays images when device 100 is in its closed configuration in which device 100 operates as a cellular phone. In this configuration, display 102 is able to displayconventional text and/or graphical images associated with sending and receiving telephone calls using a cellular phone.
Displays 104 and 106 display images when device 100 is in its open configuration in which device 100 operates as a personal digital assistant (PDA). According to one embodiment of the present invention, each of displays 104 and 106 displayspart, e.g., half, of each PDA image. In the open configuration, displays 104 and 106 are positioned next to each other and display drivers in device 100 divide images for display on the two displays. The image thus displayed overflows from one displayto the other, giving the appearance of a single large display displaying the full image. The multiple small displays combine to simulate the operations of a single large display. As such, device 100 is able to present concurrently more useableinformation to the user than would otherwise be available to a user of a conventional PDA that had a single small display.
Displays 104 and 106 may be any suitable type of display device, including liquid crystal display (LCDs). In device 100, a hinge or other similar mechanism may be used to keep the displays together when used in the open, e.g., active,configuration or the closed, e.g., inactive, configuration. A locking mechanism can be used to keep the combined structure rigid when the screens are unfolded. As shown in FIG. 1(b), the different displays need not be co-planar in order for the deviceto be used in the active configuration.
Device 100 has two flat-panel displays 104 and 106 which may be less than 5 mm thick without a backlight. When the device is in its inactive configuration, the two sides are folded together. For example, if a 5''.times.5'' display area isimplemented using two 5''.times.2.5'' displays, the two displays are stored flat against each other. The inactive area is therefore only half of the active area, resulting in a more compact configuration for carrying and/or storing the device.
FIG. 1(c) shows a perspective view of a portable electronic device in the open configuration, according to an alternative embodiment of the present invention. According to this embodiment, display 102 of FIG. 1(a) and display 104' of FIG. 1(c)are positioned back-to-back within the top half of the device. In one implementation of this embodiment, the device has backlighting means located behind display 106', and displays 106' and 104' are transparent. For such an implementation, thebacklighting means behind display 106' will illuminate display 102 when the device is in the closed configuration as shown in FIG. 1(a). In this ways, a thinner device with backlighting can be achieved. Furthermore, in certain embodiments, display 102of FIG. 1(a) and display 104' of FIG. 1(c) may be implemented as a single display device that is adapted to generate images for both the open and closed configurations and possibly at the same time.
FIG. 2 shows a block diagram of an electronic device 200, according to one implementation of the present invention. For example, electronic device 200 may be modified as needed to implement device 100 of FIGS. 1(a)-(b). Device 200 has two ormore display devices that may be used to display different sets of image signals to create the effect of a larger display.
In particular, image generator 206 generates image signals for display on display devices 210. The image signals may comprise any conventional type of image signals, including text, video, graphics, or any combination thereof. Display driver208 receives the image signals from image generator 206 and distributes appropriate subsets of image signals to the various display devices 210 for display. Each display device 210 operates as a distinct image display device. The effect however of allof the display devices 210 operating together under the control of display driver 208 is the simulation of a larger display device displaying all of the image signals generated by image generator 206. Image generator 206 and display driver 208 may beimplemented on a single processor, either in hardware, in software, or in a combination of both hardware and software.
Electronic device 200 also has optical local input device 202 and optional remote input device 204. Local input device 202 may be any suitable device that enables a user to enter information into device 200, such as a keyboard, a keypad, astylus for a touch screen, a thumb wheel for scrolling, or a track pad. This information is received by image generator 206 for appropriate updating of the image signals to be displayed. Remote input device 204 may be an antenna, network, or cableport, or other suitable type of interface for receiving information from a remote source. This information is also received by image generator 206 for the update of the images to be displayed. In particular implementations, one or more of the displaydevices may be touch sensitive to operate as additional input devices of device 200 for the input of user-selected information to be fed back to image generator 206.
FIG. 3 shows a block diagram of an electronic device 300, according to an alternative implementation of the present invention. Electronic device 300 is analogous to electronic device 200 of FIG. 2, except that each display device 210 in device300 has its own display driver 308 to control the display of subsets of image signals. Image generator 306 and display drivers 308 may be implemented on a single processor, either in hardware, in software, or in a combination of both hardware andsoftware.
Depending on the implementation, the function of dividing image signals into subsets for display on the various display devices may be performed by either the image generator or the one or more display drivers. Even in device 300 of FIG. 3,where each display driver 308 interfaces with only a single display device, image generator 306 could generate and store the image signals into memory, and each display driver 308 could know which subset of those image signals to retrieve from memory. In any case, the image signals are divided into subsets based on the portions of each image displayed by the various display devices. For example, in the embodiment of FIG. 4, where the display devices display the top and bottom halves of each image,respectively, the image signals are divided into two subsets accordingly. Similarly, in the embodiment of FIG. 6, where the display devices display the top half, lower left quarter, and lower right quarter of each image, respectively, the image signalsare divided into three subsets accordingly.
FIGS. 4-6 shows portable electronic devices, according to possible embodiments of the present invention. In FIG. 4, the portable electronic device has two displays that are shown in the full open configuration. In FIG. 5, the portableelectronic device is shown configured with its two displays separated.
In FIG. 6, the portable electronic device has three separable displays. As mentioned above, in some implementations of the present invention, one or more of the display devices may operate as touch-type input devices. In these implementations,parts of one or more of the display devices could be used as a soft keyboard in which a keyboard is displayed on the screen and the user "types" by touching the screen at the appropriate locations. The touch membrane detects the locations where the usertypes and infers which characters are being typed. In one embodiment of the present invention, one of the multiple display devices may be a touch-type device that provides the soft keyboard. In an alternative embodiment, two such display devices may beused: one providing the left-hand portion of the soft keyboard and the other providing the right-hand portion of the soft keyboard. These display devices may be able to be positioned in different orientations, as selected by the user. Moreover, thedisplay devices may be able to be physically separated from one another, as shown in FIG. 6. For example, in the application as a soft keyboard, the left- and right-hand touch screens may be separated to suit the user's ergonomic preferences. Thesetouch screens may be stowed away when the electronic device is in the closed configuration.
In some embodiments of the present invention, the electronic devices support an alternative mode of operation in which two or more of the multiple displays can operate as distinct displays that display different images rather than different partsof the same images.
Although the present invention is particularly suitable for portable electronic devices, such as personal digital assistants, cellular telephones, internet access devices, palmtop computers, and laptop computers, those skilled in the art willunderstand that the present invention may be applied to other types of electronic devices as well, including stationary computer terminals.
It will be further understood that various changes in the details, materials, and arrangements of the parts which have been described and illustrated in order to explain the nature of this invention may be made by those skilled in the art withoutdeparting from the principle and scope of the invention as expressed in the following claims.
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