Source: http://www.google.com/patents/US8013831?dq=5,742,768
Timestamp: 2015-06-30 21:06:29
Document Index: 136162226

Matched Legal Cases: ['Application No. 60', 'Application No. 2007', 'application No. 200910215524', 'Application No. 200580030964', 'Application No. 05', 'Application No. 08153690', 'Application No. 08153691', 'Application No. 08', 'Application No. 2007', 'Application No. 2007115881']

Patent US8013831 - Methods and devices for lighting displays - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsVarious devices and methods of lighting a display are disclosed. In one embodiment, for example, a display device includes a transmissive display configured to be illuminated through a back surface and a reflective display configured to be illuminated through a front surface. A light source is disposed...http://www.google.com/patents/US8013831?utm_source=gb-gplus-sharePatent US8013831 - Methods and devices for lighting displaysAdvanced Patent SearchPublication numberUS8013831 B2Publication typeGrantApplication numberUS 12/821,070Publication dateSep 6, 2011Filing dateJun 22, 2010Priority dateSep 27, 2004Fee statusPaidAlso published asCA2576177A1, CN100592166C, CN101019067A, CN101762906A, CN101762906B, DE602005009560D1, DE602005025047D1, EP1794646A1, EP1794646B1, EP2040114A2, EP2040114A3, EP2040114B1, EP2264518A2, EP2264518A3, EP2264519A2, EP2264519A3, US7750886, US8411026, US20060066783, US20100309103, US20120062575, WO2006036415A1Publication number12821070, 821070, US 8013831 B2, US 8013831B2, US-B2-8013831, US8013831 B2, US8013831B2InventorsJeffrey B. SampsellOriginal AssigneeQualcomm Mems Technologies, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (95), Non-Patent Citations (39), Referenced by (9), Classifications (13), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMethods and devices for lighting displays
US 8013831 B2Abstract
Various devices and methods of lighting a display are disclosed. In one embodiment, for example, a display device includes a transmissive display configured to be illuminated through a back surface and a reflective display configured to be illuminated through a front surface. A light source is disposed with respect to the back of the transmissive display to illuminate the transmissive display through the back surface. A light pipe is disposed with respect to the light source to receive light from the light source and is configured to propagate the light such that this light provides front illumination of the reflective display.
a first display, said first display being reflective;
a light source disposed rearward of said first display;
one or more first light guides disposed to receive light from said light source; and
one or more second light guides disposed forward of said first display, wherein the one or more first light guides are optically coupled to the one or more second light guides such that light emitted by the one or more first light guides is directed into said one or more second light guides, to provide front illumination to said first display.
2. The display of claim 1, further comprising a second display positioned such that said light source is disposed rearward of said second display, wherein said light source provides illumination to said second display.
3. The display of claim 1, wherein said one or more first light guides comprises a backplate disposed rearward of said first display.
4. The display of claim 1, wherein said one or more second light guides comprises an optical plate, sheet, or film.
5. The display of claim 1, wherein said one or more second light guides comprises a substrate of the first display.
6. The display of claim 1, wherein said first display comprises a plurality of light modulating elements.
7. The display of claim 6, wherein said plurality of light modulating elements comprises a plurality of interferometric modulators.
8. The display of claim 1, wherein said one or more second light guides includes optical features configured to redirect said light coupled therein to said first display.
9. The display of claim 8, wherein said optical features include mini-prisms, micro-lenses, a hologram, a diffractive optical element, or a diffuser.
10. The display device of claim 1, further comprising:
a processor in electrical communication with said first display, said processor configured to process image data; and
11. The display device of claim 10 , further comprising a driver circuit configured to send at least one signal to said first display.
12. The display system of claim 11, further comprising a controller configured to send at least a portion of said image data to said driver circuit.
13. The display of claim 1, wherein the light source comprises an optically reflective surface having one or more light leak apertures configured to leak light, and wherein the one or more first light guides are disposed to receive light from the light leak apertures.
14. The display of claim 13, wherein the light source extends across a portion of a back of the first display, wherein the light source comprises a surface facing towards the first display, and wherein the one or more light leak apertures are located on the surface facing towards the first display.
15. The display of claim 14, wherein the light source comprises a major surface extending across a portion of the back of the first display and a minor surface, wherein an area of the major surface is larger than an area of the minor surface, and wherein the major surface of the light source is the surface facing towards the first display.
16. The display of claim 13, wherein the light source comprises light control patterns that are configured to compensate for the light leaked by the one or more light leak apertures to produce a substantially uniform light distribution across a length of the light source.
providing a first display, said first display being reflective;
providing a light source disposed rearward of said first display;
providing one or more first light guides disposed to receive light from said light source; and
providing a second light guide forward of said first display, such that the one or more first light guides are optically coupled to the second light guide such that light emitted by the one or more first light guides is directed into said second light guide, to provide front illumination to said first display.
18. The method of claim 17, further comprising providing a second display such that said light source is disposed rearward of said second display, wherein said light source provides illumination to said second display.
19. The method of claim 17, wherein said one or more first light guides comprises a backplate disposed rearward of said first displaying means.
20. The method of claim 17, wherein said second light guide comprises an optical plate, sheet, or film.
21. The method of claim 17, wherein said second light guide comprises a substrate of the first display.
22. The method of claim 17, wherein said first display comprises a plurality of light modulating elements.
23. The method of claim 22, wherein said plurality of light modulating elements comprises a plurality of interferometric modulators.
24. The method of claim 17, wherein said second light guide includes optical features configured to redirect said light coupled therein to said first display.
25. The method of claim 24, wherein said optical features include mini-prisms, micro-lenses, a hologram, a diffractive optical element, or a diffuser.
26. The method of claim 17, wherein the light source comprises an optically reflective surface having one or more light leak apertures configured to leak light, and wherein the one or more first light guides are disposed to receive light from the light leak apertures.
27. The method of claim 26, wherein the light source extends across a portion of a back of the first display, wherein the light source comprises a surface facing towards the first display, and wherein the one or more light leak apertures are located on the surface facing towards the first display.
28. The method of claim 27, wherein the light source comprises a major surface extending across a portion of the back of the first display and a minor surface, wherein an area of the major surface is larger than an area of the minor surface, and wherein the major surface of the light source is the surface facing towards the first display.
29. The method of claim 26, wherein the light source comprises light control patterns that are configured to compensate for the light leaked by the one or more light leak apertures to produce a substantially uniform light distribution across a length of the light source. Description
This application is a continuation of U.S. application Ser. No. 11/187,784 titled METHODS AND DEVICES FOR LIGHTING DISPLAYS, filed Jul. 22, 2005, which claims priority to U.S. Provisional Application No. 60/613,264 titled METHOD AND DEVICE FOR LIGHTING A DISPLAY, filed Sep. 27, 2004, each of which is incorporated by reference in its entirety.
A cellular phone is an example of a product in which the MEMS device can be used in a display. Cellular phones featuring a “clamshell-like” structure are typically closed when not in use and then opened to receive a telephone call. Such cellular phones do not allow viewing of a principle display located on an interior surface of the clamshell when the phone is closed. Consequently, a second smaller, less sophisticated display, which is sometimes referred to herein as a “sub-display,” can be included on an outer surface of the clamshell that is visible when the phone is closed to provide “quick-look” information without requiring a user to open the phone. The principle display and sub-display can be transmissive or transflective LCDs, which use backside illumination. To lower the cost and complexity of the cellular phone and to keep the clamshell as thin as possible, a single backlight placed in-between the principle display and sub-display can be used to illuminate both displays. In one embodiment, the backlight illuminates the principle display through a rear surface of the principle display. The backlight is configured with one or more light-leaking regions on its rear surface that correspond to the area of the sub-display. Light control patterns, for example, patterns on films attached to the backlight or patterns disposed directly on the backlight itself, can be used so that uniformity of light emitted from the front surface of the backlight is not disturbed by the loss of light that leaks out the rear surface to the sub-display.
With no applied voltage, the cavity 19 remains between the movable reflective layer 14 a and optical stack 16 a, with the movable reflective layer 14 a in a mechanically relaxed state, as illustrated by the pixel 12 a in FIG. 1. However, when a potential difference is applied to a selected row and column, the capacitor formed at the intersection of the row and column electrodes at the corresponding pixel becomes charged, and electrostatic forces pull the electrodes together. If the voltage is high enough, the movable reflective layer 14 is deformed and is forced against the optical stack 16. A dielectric layer (not illustrated in. this Figure) within the optical stack 16 may prevent shorting and control the separation distance between layers 14 and 16, as illustrated by pixel 12 b on the right in FIG. 1. The behavior is the same regardless of the polarity of the applied potential difference. In this way, row/column actuation that can control the reflective vs. non-reflective pixel states is analogous in many ways to that used in conventional LCD and other display technologies.
FIG. 2 is a system block diagram illustrating one embodiment of an electronic device that may incorporate aspects of the invention. In the exemplary embodiment, the electronic device includes a processor 21 which may be any general purpose single- or multi-chip microprocessor such as an ARM, Pentium�, Pentium II�, Pentium III�, Pentium IV�, Pentium� Pro, an 8051, a MIPS , a Power PC�, an ALPHA�, or any special purpose microprocessor such as a digital signal processor, microcontroller, or a programmable gate array. As is conventional in the art, the processor 21 may be configured to execute one or more software modules. In addition to executing an operating system, the processor may be configured to execute one or more software applications, including a web browser, a telephone application, an email program, or any other software application.
Referring to FIGS. 8 and 9, there are many mobile devices, e.g., the “clamshell” cell phone 82, that include a principle display 84 located on an inner surface of one half of the clamshell, and a sub-display 80 located on an outer surface of the same half of clamshell as the principle display 84. Examples of reflective devices which can be used as the principle display 84 and the sub-display 80 include LCD's and interferometric modulators. In the embodiments described herein, the principle display 84 and/or the sub-display 80 can comprise interferometric modulators. If the principle display 84 and the sub-display 80 are both reflective devices, they may benefit from receiving additional illumination when ambient light is not sufficient to view displayed information. Examples of devices for providing additional illumination include light emitting diodes (LEDs), incandescent lamps, and fluorescent lamps. Approaches that are described herein for providing light to the principle display 84 can also be used to provide light to the sub-display 80, and vice-versa.
In embodiments where the light pipes 112, 114 couple light into the substrate, the optical couplings may provide index matching to reduce reflection at the interface between the light pipe and the substrate. In certain preferred embodiments, the exit port of the light pipes 112, 114 have a numerical aperture or entendue that substantially matches the numerical aperture or entendue of the substrate. In some embodiments, optical coupling provides a numerical aperture or entendue that matches that of the substrate. This optical coupling may, for example, alter the numerical aperture or entendue of the light pipe 112, 114 to substantially match that of the substrate. An imaging or non-imaging optical component may, for example, be used to achieve this conversion of numerical aperture or entendue. In some embodiments, the end of the light pipe 112, 114 is shaped and configured to provide this conversion.
Similarly, as described below, in embodiments where the light pipes 112, 114 couple light into an optical plate, sheet, layer, of thin film, the optical couplings may provide index matching to reduce reflection. Likewise, entendue may be substantially matched to increase or maximize throughput. In certain embodiments where the light pipes 112, 114 are coupled to both the substrate and one or more optical plate, sheet, layer, or film thereon, entendue may be substantially matched as well to increase throughput.
The optical plate 152 can be optically coupled to the light pipes 112, 114 by a variety of techniques. For example, optical adhesive or other coupling material may be used as optical coupling 154, 156, or the light pipe 112, 114 may be near or touching the optical plate 152. The optical coupling 154, 156 may provide index matching to reduce reflection at the interface between the light pipes 112, 114 and the optical plate 152. In certain preferred embodiments, the exit port of the light pipes 112, 114 have a numerical aperture or entendue that substantially matches the numerical aperture or entendue of the optical plate 152. In some embodiments, optical coupling 114, 156 provides a numerical aperture or entendue that matches that of the optical plate 152. This optical coupling may, for example, alter the numerical aperture or entendue of the light pipe to substantially match that of the optical plate 152. An imaging or a non-imaging optical component may, for example, be used to achieve this conversion of numerical aperture or entendue. In some embodiments, the ends of the light pipes 112, 114 are shaped and configured to provide this conversion.
The embodiments described herein relate not only to providing light to a sub-display by a dual display light source, but also to providing light to the principle display. For example, if the principle display is a reflective display that cannot receive light through its back surface that faces the backlight, the above-described light pipes and backplate configurations for the sub-display can be utilized to illuminate the principle display. For example, FIG. 20 illustrates a dual display outfitted with first and second light sources 192, 194 disposed between the sub-display 80 and a principle display 182. Light pipes 181, 183, 185, 187 optically couple the light sources 192, 194 to the backplates 116, 117, which are also light guides. The light is further funneled by additional optical pipes 186, 188, 196, 198 to the displays 80, 84. In FIG. 20, the additional optical pipes 186, 188, 196, 198 are optically coupled to an optical film or plate 174, 184 disposed forward at the displays 80, 84.
The optical films or plates 174, 184 may comprise optical features to redirect light toward the light modulating elements as discussed above. Also, as discussed above, the light pipes 186, 188, 196, 198 and optical plate 152, 184 may be optically coupled in a manner that increases the transfer of light. However, in some embodiments the additional optical pipes 181, 183, 185, 187, 186, 188, 196, 198 and/or optical plates or films 174, 184 are not used, and the backplates 116, 117 are configured to propagate the light from light sources 192, 194 either throughout the displays 80, 182 or to the edge of the displays which may comprise scatter features. Similarly, light may be coupled by light pipes into the substrate in addition to or instead of the optical films or plates 174, 184. A wide range of variations in configuration and designs such as discussed above and elsewhere herein may be employed. For example, The display device of claim 30, wherein the light piping comprises a single backplate that provides light to both the first and second displays. Still other variations are possible as well.
As described above, dual display devices can include features that re-direct (e.g., scatter) light to the reflective display. Such features may comprise, for example, illumination dots, described in the commonly owned patent application entitled “Integrated Modulator Illumination,” U.S. patent application Ser. No. 10/794,825.
In an alternative embodiment, the dots can be placed on the surface of the diffuser 502, such as dot 510. The dots can also be formed on one or more layers on the diffuser 502 or substrate 500 or can be formed elsewhere (e.g., on an optical plate disposed between the reflective display and a viewer of the display). Changing the position of the dots may modify the dot processing sequence. A dot on the surface of the substrate, such as 504, may have a first reflective material 508 deposited and then covered by an ‘overcoat’ 506 of absorbing material. If the dots reside on the surface of the diffuser 502, such as 510, the absorbing material 512 may be put down first, followed by the reflective material 514. This approach maintains the proper orientation of the layers with regards to the modulator and the viewer 214.
In an alternative embodiment, the spatial light modulator is manufactured on the ‘back side’ (away from the viewer) of the substantially optically transmissive substrate at block 610. The spatial light modulator is finished at block 612. In one embodiment, the illumination dots are applied to the front side of the substrate at block 614 and the diffuser is applied at block 616.
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