Source: http://www.google.com/patents/US7807488?dq=6,108,703
Timestamp: 2016-09-25 00:36:56
Document Index: 262676922

Matched Legal Cases: ['Application No. 05255638', 'Application No. 05255646', 'Application No. 05255715', 'Application No. 200580032162', 'Application No. 2007', 'Application No. 2007', 'Application No. 05255638']

Patent US7807488 - Display element having filter material diffused in a substrate of the ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsOptical filter functionality is incorporated into a substrate of a display element thereby decreasing the need for a separate thin film filter and, accordingly, reducing a total thickness of a filtered display element. Filter functionality may be provided by any filter material, such as pigment materials,...http://www.google.com/patents/US7807488?utm_source=gb-gplus-sharePatent US7807488 - Display element having filter material diffused in a substrate of the display elementAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7807488 B2Publication typeGrantApplication numberUS 11/213,644Publication dateOct 5, 2010Filing dateAug 19, 2005Priority dateSep 27, 2004Fee statusPaidAlso published asUS8344377, US20060067600, US20090086301, WO2006036564A2, WO2006036564A3Publication number11213644, 213644, US 7807488 B2, US 7807488B2, US-B2-7807488, US7807488 B2, US7807488B2InventorsBrian J. Gally, William J. CummingsOriginal AssigneeQualcomm Mems Technologies, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (328), Non-Patent Citations (59), Referenced by (35), Classifications (6), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetDisplay element having filter material diffused in a substrate of the display element
US 7807488 B2Abstract
Optical filter functionality is incorporated into a substrate of a display element thereby decreasing the need for a separate thin film filter and, accordingly, reducing a total thickness of a filtered display element. Filter functionality may be provided by any filter material, such as pigment materials, photoluminescent materials, and opaque material, for example. The filter material may be incorporated in the substrate at the time of creating the substrate or may be selectively diffused in the substrate through a process of masking the substrate, exposing the substrate to the filter material, and heating the substrate in order to diffuse the filter material in the substrate.
1. A method of forming a display device, the method comprising:
diffusing a material into a substrate, said material having a different optical property than said substrate; and
forming at least one light modulating element over the substrate, the light modulating element comprising a partially reflective surface and a substantially reflective surface that form an optical cavity, at least one of said reflective surfaces movable with respect to the other to modulate said optical cavity.
2. The method of claim 1, further comprising depositing the material over the substrate.
3. The method of claim 2, further comprising heating the substrate.
4. The method of claim 2, further comprising heating the substrate to a temperature in the range of about 200 to 250 degrees Celsius.
5. The method of claim 3, wherein the substrate is heated for a time sufficient to diffuse the material to a predetermined level within the substrate.
6. The method of claim 5, wherein the predetermined level is less than about ⅓ of a thickness of the substrate.
7. The method of claim 5, wherein the predetermined level is greater than about ⅓ of a thickness of the substrate.
8. The method of claim 1, wherein at least one optical characteristic of the material changes as the material diffuses into the substrate.
9. The method of claim 1, further comprising applying the material to the substrate.
10. The method of claim 9, wherein applying comprises spraying the material.
11. The method of claim 9, further comprising positioning a mask on the substrate prior to applying the material to the substrate.
12. The method of claim 1, wherein the substrate comprises at least one of: glass and polymer.
13. The method of claim 1, wherein the material comprises black pigment.
14. The method of claim 1, wherein the material comprises colored pigment.
15. The method of claim 1, further comprising diffusing different materials into the substrate.
16. The method of claim 15, wherein different materials are diffused for different light modulating elements.
17. The method of claim 1, wherein the light modulating element comprises an interference modulator.
18. The method of claim 1, wherein the light modulating element comprises a micro-electro-mechanical device.
19. The method of claim 1, wherein the display device comprises a reflective display device.
20. The method of claim 1, wherein the display device comprises an interferometric modulator.
21. The method of claim 1, wherein the substantially reflective surface is movable with respect to the partially reflective surface and the substrate.
22. The method of claim 21, wherein the optical cavity is disposed relative to the substrate such that the partially reflective surface is between the substantially reflective surface and the substrate.
23. A method of forming a display device, the method comprising:
combining a substrate material with a filter material in order to form a mixture;
heating the mixture so that the substrate material substantially melts and the filter material is diffused within the melted substrate material;
cooling the mixture in order to form a substrate; and
forming a plurality of light modulating elements over the substrate, at least one of the light modulating element comprising a partially reflective surface and a substantially reflective surface that form an optical cavity, at least one of said reflective surfaces movable with respect to the other to modulate said optical cavity, the plurality of light modulating elements configured to allow formation of an image on the display device, the display device configured such that the image is viewed through the substrate.
24. The method of claim 23, wherein the raw substrate material comprises at least one of: polymer pellets, sand, flint, or quartz.
25. The method of claim 23, wherein the substrate material is at least partially molten when combined with the filter material.
26. The method of claim 23, wherein the substrate material is not molten when combined with the filter material.
27. The method of claim 23, wherein the plurality of light modulating elements are arranged in an array.
28. The method of claim 27, wherein the display device is configured to be used in a cell phone such that the image is viewed through the substrate from the viewing side of the cell phone.
29. A method of forming an interferometric modulator, the method comprising:
forming at least one light modulating element over the substrate, the light modulating element comprising a partially reflective surface and a substantially reflective surface that form an optical cavity, at least one of said reflective surfaces movable with respect to the other to modulate said optical cavity, the optical cavity disposed relative to the substrate such that the partially reflective surface is between the substantially reflective surface and the substrate.
30. The method of claim 29, wherein the substantially reflective surface is movable with respect to the partially reflective surface and the substrate.
This application claims priority under 35 U.S.C. � 119(e) to U.S. Provisional Application Ser. No. 60/613,481, filed on Sep. 27, 2004, which is hereby expressly incorporated by reference in its entirety.
In one embodiment, a method of forming a display device comprises the steps of diffusing a material into a substrate, said material having a different optical property than said substrate, and forming at least one light modulating element over the substrate, the light modulating element comprising a partially reflective surface and a substantially reflective surface that form an optical cavity, at least one of said reflective surfaces movable with respect to the other to modulate said optical cavity.
The following detailed description is directed to certain specific embodiments of the invention. Various embodiments of the invention, for example, relate to incorporating optical filter functionality into a substrate of a display element. Filter functionality may be provided by any filter material, such as pigment materials, fluorescent materials, and opaque material, for example. The filter material may be incorporated in the substrate at the time of creating the substrate or may be selectively diffused in the substrate through a process of masking the substrate, exposing the substrate to the filter material, and heating the substrate in order to diffuse the filter material in the substrate.
FIG. 8 is a cross sectional side view of an interferometric modulator 800 having dark tinting in selected portions of the substrate. The interferometric modulator 800 comprises a movable mirror 806 separated from a partial reflector 802 by supports 804. In FIG. 8, the partial reflector 802 is adjacent a substrate 810 that includes selective dark tinting 830. Exemplary FIG. 8 also illustrates a dielectric 820 in the interferometric modulator and a viewing eye 510. As used herein, the term “light modulating element” and “modulating element” are used interchangeably and each include the structures between, and including, a movable mirror and a partial reflector of the interferometric modulator. With reference to FIG. 8, for example, a light modulating element 860 comprises the structure between, and including, the movable mirror 806 and the partial reflector 802.
With respect to FIG. 9, for example, as the optical path length d between the partially reflective mirror 902 and movable mirror 906 is increased, longer wavelengths are, in general, reflected light. In certain embodiments, constructive interference may also occur when the distance between the reflective mirror 902 and movable mirror 906 is a multiple of � the wavelength of the desired color, such as approximately 1� the wavelength and 1�� the wavelength, etc. Each time this occurs, the “order” of the light being generated increases. For example, when the gap distance is approximately � the desired wavelength, the color is called a first order color. When the optical path length d is approximately equal to the wavelength, it is called a second order color, at approximately 1��the wavelength is a third order color. In the relaxed state illustrated in FIG. 9, the optical path length d is set to about the wavelength of red light so that the interferometric modulator 900 reflects second order red light.
In the embodiment of FIG. 10, a wavelength of light viewable by the viewing eye 510 from each light modulating element 1000 is adjusted by incorporating colored filters 1030 in the substrate 1010. For example, the interferometric modulator array 1001 comprises a red tinting 1030A forward of the first light modulating element 1000A, a blue tinting 1030B forward of the second light modulating element 1000B, and a green tinting 1030C forward of the third light modulating element 1000C. Thus, the array 1001 provides three colors from light modulating elements having the same dimensions. In this embodiment, manufacturing of color interferometric modulator displays may be simplified because an entire display may be made with the same gap distance between the movable mirror 1006 and partial reflector 1002 and patterning the substrate to include color filters. In one embodiment, the three light modulating elements 1000A, 1000B, 100C comprise a pixel of a display.
In some embodiments, gradient tinting may be incorporated into the substrate, such as the substrate 1110, so that as the viewing angle increases from normal to the substrate 1110, the amount of reflected light that is filtered by the tinting increases. Thus, the further from normal to the substrate a viewer is from an interferometric modulator display, the more dim the image. For example, if the viewing eye 510 is positioned so that the it sees light reflected from the interferometric modulator 1100 in direction 1150, which is normal to the front surface of the substrate 1110, the viewing eye 510 sees light that has twice passed through a thickness, t, of the substrate 1110 including the filter material (e.g., the light passes through the substrate 1110 when entering the interferometric modulator 1100 and passes through the substrate 1110 again when leaving the interferometric modulator 1100). When the viewing eye 510 moves to a position so that it sees light reflected from the interferometric modulator 1100 in an off-normal direction 1152, a thickness of the substrate 1110 that the reflected light passes through has increased. For example, if the angle between directions 1150 and 1152 is about 45 degrees, the thickness of the substrate 1110 across direction 1152 is about t*1.414. Accordingly, the light seen by the viewing eye 150 at direction 1152 has passed through about three times the amount of substrate 1110 as the light passes through in direction 1150 (e.g., the light passes through a thickness of about t*1.4 twice, which is about 2.8 t), and through about three times as much of the filtering material in the substrate 1110. Thus, if the filter material in the substrate 1110 absorbs certain wavelengths of light, as the angle between the direction 1150 and the viewing eye 510 increases, the amount of the certain wavelengths that are absorbed by the substrate 1110 will also increase.
FIG. 12B is a perspective side view and FIG. 12C is a top view of an exemplary substrate 1211 having baffles 1261 incorporated in the substrate 1211. In the embodiment of FIGS. 12B and 12C, the baffles 1261 are substantially vertically aligned columnar features. In one embodiment, the outer surfaces 1262 a of the baffles 1261 are coated with an opaque material. The baffles 1261 may be disposed in the substrate 1211 by any of the methods discussed above, such as by heating the substrate 1211, placing the baffles on a top surface of the substrate 1211, and allowing the baffles to sink into the substrate 1211.
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CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IDC, LLC;REEL/FRAME:023435/0918Effective date: 20090925Owner name: QUALCOMM MEMS TECHNOLOGIES, INC.,CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IDC, LLC;REEL/FRAME:023435/0918Effective date: 20090925Mar 26, 2014FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services