ELECTRONIC DEVICE HAVING A DISPLAY

Abstract: An electronic device (10), such as a portable telephone or PDA, has a display (12) in the form of a pixel display with an image deflection system (8) overlying the display (12). The display is controlled to provide at least two independent display images which, when displayed through the image deflection system (8), are individually visible from different viewing positions relative to the screen. Suitably, the image deflection system (8) comprises a lenticular screen with the lenticles (24) extending horizontally or vertically across the display (12) such that the different views may be seen through tilting of the device.

Description: DESCRIPTION ELECTRONIC DEVICE HAVING A DISPLAY This invention relates to an electronic device having a display. Electronic devices (such as portable telephones, electronic organisers or personal digital assistants - PDA's) are becoming increasingly complex, and it is now routine for such devices to use a pixel display to display information to the user of the device. Indeed, the user interface for such devices offers an increasing number of options to the user, but of course the amount of information which can be displayed on the small display screen of a hand-held device is limited. Although screen resolution is improving rapidly, the limited area available for the screen will always provide a limitation to the amount of information which can be simply displayed in small hand-held or portable devices such as mobile telephones. Larger amounts of data may be made available through the use of nested menus and tree-structured data storage arrangements, but with a small display available, the user may be faced with a requirement to repeatedly select from the limited available displayed options and wait while the next navigation level of the interface is accessed in order to access even relatively close branches of a data tree. It is therefore an object of the present invention to provide an improved electronic device. According to the present invention, there is provided an electronic device having a display and an image deflection system overlying the display, wherein the display is controlled to provide at least two independent display images which, when displayed through the image deflection system, are individually visible from different viewing positions relative to the display. Owing to the invention, it is possible to provide a device that can present a greater volume of useful data for a given display size. The electronic device of the invention has an image deflection system overlying the display so that the device can provide multiple views to the user, each view being visible from different viewing positions. The use of lenticular screens over display devices is well known for providing autostereoscopic images to the user, and the deflection system may comprise a lenticular screen. In autostereoscopic devices, the lenticular screen provides viewing positions for different images which are spaced by a distance corresponding to the separation of human eyes. In this way, different images are directed to the left and right eyes of the user so as to generate the perception of a stereo image without requiring the user to wear, for example, spectacles having different coloured lenses. To generate stereo images, the lenticles of the lenticular screen extend from the top to bottom of the screen so that a lateral shift of the viewing position relative to the screen results in different images being visible. The lenticles in the image deflection system of the invention may extend across the display so that different images are visible as a function of the angle of inclination of the viewer with respect to the screen. In this way, a user may view the different images by tilting the device about a horizontal axis. Each lenticle may be associated with three or more display images. For example, a first main image may be provided at a natural position of the device with respect to the user. Tilting the device one way may result in an image being displayed which represents the previous screen of the user interface display. Tilting the device in the other direction may provide explanation regarding the options presented to the user at that time. The display preferably comprises a pixel display, for example a liquid crystal display, and the device may be a mobile telephone or television, although other options will become apparent to the skilled reader on reading the following description of preferred embodiments. Embodiments will now be described, by way of example only, with reference to and as shown in the accompanying drawings, in which: Figure 1 schematically represents a mobile telephone, Figure 2 shows how different images may be viewed from the screen of the telephone of Figure 1 , Figure 3 is illustrative of output addressing for a display in the telephone of Figures 1 and 2 giving rise to multiple images, Figure 4 is a schematic plan view of a television being viewed by two people, and Figure 5 is a schematic plan view of a television being viewed by a single person. Figure 1 shows a mobile telephone 10 having a display 12 and a number of input buttons 14 as well as a microphone 16 and a speaker 18. The display 12 comprises a pixel display, in the form of a liquid crystal display, over which is provided an image deflection system, in the form of a lenticular screen 8, of the type which has previously been used in the creation of autostereoscopic LCD displays. A display device of this type for use as an autostereoscopic display is described in detail in the commonly assigned EP- A-0 791 847, the disclosure of which is incorporated herein by way of reference. The display 12 is controlled to provide at least two independent display images which, when displayed through the lenticular screen 8, are individually visible from different viewing positions relative to the screen 8. In conventional autostereoscopic lenticular screen display devices, the lenticles extend from top to bottom of the screen so that different images are projected by the lenticular screen to different lateral positions of the user with respect to the screen. The present invention is applicable with this horizontal separation of views although, as will be described below, vertical view separation (through use of horizontally extending lenticles) is equally possible. As shown schematically in Figure 1 , lenticles 24 of the screen 8 overlying the display 12 extend across the display 12, so that the multiple display images are visible at different elevations with respect to the screen. Furthermore, horizontal alignment of the lenticles results in the same image being displayed to the left and right eyes of the user. Thus, the two or more images may be viewed by tilting the mobile telephone 10 about a horizontal axis 20. Figure 2 shows how the telephone 10 may be tilted about this horizontal axis 20. Figure 2A shows a normal viewing position of the mobile telephone 10 in which the user views the screen from a location substantially normal to the plane of the screen. In this position a menu of input options may be displayed to the user, although in Figure 2A the display image is indicated simply as "View 1 ". In order to view a second image, the top of the phone may be tilted towards the user, as represented in Figure 2B. The image displayed is represented as "View 2", and this may, for example, provide a view of the previous screen so that the user is able to recollect the path of options he has followed during the previous input of data to the telephone 10. A third image, represented in Figure 2C as "View 3" may be obtained by tilting the mobile telephone 10 in an opposite direction. This screen may, for example, provide help information about the normal screen, View 1. The use of multiple independent display images enables the small screen to provide additional information to the user, without the need to press any buttons, thereby improving the clarity of the user interface. There are various additional ways in which the multiple images may be used. For example, for a quiz game, a question may be displayed as one image, and the answer may be displayed as another image. For example, with applications accessed from the Internet, the information obtained from the Internet may provide specific control as to which data is to be displayed as each possible image. Figure 3 shows in greater detail how the pixel display device is addressed to provide the multiple views. Each pixel 22 is represented as a square in Figure 3, although each display position may comprise a triplet of pixels for a colour display. Each lenticle 24 overlies three rows of pixels 22 and all pixels having the same relative position with respect to a lenticle 24 will be visible to a user at the same time. Thus, in Figure 3 the central row of pixels may together form View 1 , the top row of pixels with respect to each lenticle 24 may provide View 2 and the bottom row of pixels with respect to each lenticle 24 may provide View 3, as illustrated. Although the embodiment has been described specifically in relation to a mobile telephone, it can be applied to other hand-held or portable devices, such as remote controls, calculators, wrist watches, PDA devices, pagers and multi-function watches. The display device may comprise an active matrix LCD device, although passive LCD displays or other types of display, such as polymer LED displays, may be used. Figures 4 and 5 show a second embodiment in which a television 30 is provided with a display 12 and an image deflection system, in the form of a lenticular screen 8, overlying the display 12. The lenticles of the screen 8 are arranged in a vertical orientation to provide independent display images that are individually visible from different viewing positions. In Figure 4, two users 32 and 34 can view different images by each aligning themselves with a pair of images displayed by the display 12. The display 12 is controlled to provide four display images, left and right eye views for two independent display images. When displayed through the lenticular screen 8, two different images are individually visible from the different viewing positions of the users 32 and 34. In Figure 5, a single user 34 can locate himself such that by making only a relatively small movement of his head, he can switch between the two views displayed by the television 30. The control of the device to provide the correct display image, having regard to the lenticular screen overlying the display, has not been described, as the methods for combining multiple images and the drive schemes for driving the display device will be known to those skilled in the art. Similarly, the specific design of the lenticular screen and of the display device itself will be known to those skilled in the art.

Claims: CLAIMS 1. An electronic device having a display and an image deflection system overlying the display, wherein the display is controlled to provide at least two independent display images which, when displayed through the image deflection system, are individually visible from different viewing positions relative to the display. 2. A device as claimed in claim 1 , wherein the image deflection system comprises a lenticular screen. 3. A device as claimed in claim 2, wherein lenticles of the lenticular screen extend across the display. 4. A device as claimed in claim 2 or 3, wherein each lenticle of the lenticular screen is associated with three or more display images. 5. A device as claimed in any preceding claim, wherein said display is in the form of a pixel display. 6. A device as claimed in claim 5, wherein the display is a liquid crystal display. 7. A device as claimed in any preceding claim, wherein said device is portable. 8. A device as claimed in claim 7, wherein said device is a mobile telephone. 9. A device as claimed in any one of claims 1 to 7, wherein said device is a television.

Inventors: BELL DAVID A, BYRNES NIGEL J, SIMONS PAUL R, BELL, DAVID, A., BYRNES, NIGEL, J., SIMONS, PAUL, R.
Applicants: KONINKL PHILIPS ELECTRONICS NV, KONINKLIJKE PHILIPS ELECTRONICS N.V.
Application year: 2001
Main classification: G02B27
IPC codes: G02B3, G02B27, G03B21, G09F9, G09F19, G09G3, H04N5, H04N13