Apparatus having a flat display

• US 6,819,386 B2
• Filed: 09/24/2002
• Issued: 11/16/2004
• Est. Priority Date: 09/28/2001
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Marsh, Simon Robert, Creemers, Tijsbert Mathieu Henricus, Roosendaal, Sander Jurgen
• Primary Examiner(s): NGUYEN, DUNG T
• Application Number:
  US10/253,285
• Publication Number:
  US 20030063243A1
• Time in Patent Office: 784 Days
• Field of Search: 349/143-144, 349/113-114, 349/1, 349/16
• US Class Current: 349/144
• CPC Class Codes: G02F 1/133342 for double-sided displays
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G06F 1/1616 with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
• CPC Class Codes: G06F 1/1637 Details related to the display arrangement, including those related to the mounting of the display in the housing
• CPC Class Codes: G06F 1/1647 including at least an additional display G06F1/1692 takes precedence
• CPC Class Codes: H04M 1/0214 Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position combined with translation movement H04M1/0235
• CPC Class Codes: H04M 2250/16 including more than one display unit

Abstract

A transflective display (2) in e.g. the lid of a mobile display is used in the reflective mode in one viewing direction (frontlight) and in the transmissive mode in the other direction (backlight) when the lid is open.

Claims

1. An apparatus comprising a display device having a flat display, provided with means for visualizing at least one image in two planes located on opposite sides of the display, the display being provided with sub-pixels comprised by pixels that are visible on both sides of the display, which sub-pixels are provided with electrodes on at least a first substrate, each electrode comprising a transparent and a reflective sub-electrode.

2. The apparatus of claim 1, wherein the pixels that are visible on both sides of the display have substantially the same dimensions on both sides.

3. The apparatus of claim 1, wherein the first substrate and a second substrate are provided with electrodes each comprising a transparent and a reflective sub-electrode, in which, viewed transversely to the substrates, the transparent and the reflective sub-electrode are substantially complementary with respect to each other.

4. The apparatus of claim 1, comprising an electro-optical material between two transparent substrates that include the first substrate and a second substrate, while the second substrate substantially comprises a transparent electrode at the area of the image to be displayed.

5. The apparatus of claim 4, comprising an illumination source on the side of the display remote from the first substrate.

6. The apparatus of claim 1, wherein the first substrate comprises an optically switching foil.

7. The apparatus of claim 6, said electrodes forming a first pattern of electrodes, the apparatus including:

a waveguide disposed on a side of the first substrate remote from the first pattern of electrodes; and

a second pattern of electrodes on the side of the waveguide remote from the first substrate, each electrode of the second pattern of electrodes comprising a transparent and a reflective sub-electrode,

such that, viewed transversely to the substrates, the transparent and the reflective sub-electrodes of the two patterns are substantially complementary with respect to each other.

8. A display device comprising means for visualizing at least one image in two planes located on opposite sides of a flat display, the display being provided with sub-pixels comprised by pixels that are visible on both sides of the display, which sub-pixels are provided with electrodes on at least a first substrate, each said electrode comprising a transparent and a reflective sub-electrode.

9. The display device of claim 8, wherein said pixels that are visible on both sides of the display have substantially the same dimensions on both sides.

10. The display device of claim 8 including a second substrate, wherein the first substrate and the second substrate are provided with electrodes each comprising a transparent and a reflective sub-electrode, in which, viewed transversely to the substrates, the transparent and the reflective sub-electrode are substantially complementary with respect to each other.

11. The display device of claim 8, wherein the first substrate comprises an optically switching foil.

12. The display device of claim 11, said electrodes forming a first pattern of electrodes, the device including:

a waveguide disposed on a side of the first substrate remote from the first pattern of electrodes; and

a second pattern of electrodes on the side of the waveguide remote from the first substrate, each electrode of the second pattern of electrodes comprising a transparent and a reflective sub-electrode

such that, viewed transversely to the substrates, the transparent and the reflective sub-electrode of the two patterns are substantially complementary with respect to each other.

13. A display comprising an electro-optical material between first and second transparent substrates, the second substrate substantially comprising a transparent electrode at the area of an image to be displayed, the display device being provided with sub-pixels comprised by pixels that are visible on both sides of the display, the sub-pixels being provided with electrodes on at least the first substrate, each electrode including a transparent sub-electrode and a reflective sub-electrode.

14. The display device of claim 13, comprising an illumination source on a side of the display remote from the first substrate.