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  Interactive display devices and methods of making the sameUSPTO Application #: 20070080956Title: Interactive display devices and methods of making the same Abstract: An interactive display device in one example may include: a first substrate and a second substrate spaced apart from each other for providing a display area; a plurality of display control elements in a first matrix over the first substrate; a plurality of first data lines over the first substrate, each of the first data lines being coupled with one or more corresponding display control elements; and a plurality of first scan lines over the first substrate, each of the first scan lines being coupled with one or more corresponding display control elements. Additionally, the interactive display device may further include: a plurality of photo sensors in a second matrix over the first substrate, the photo sensors providing an interface for receiving input information; a plurality of second data lines over the first substrate, each of the second data lines being coupled with one or more corresponding photo sensors; and a plurality of second scan lines over the first substrate, each of the second scan lines being coupled with one or more corresponding photo sensors for activating the at least one corresponding photo sensor. (end of abstract)
Agent: Akin Gump Strauss Hauer & Feld L.L.P. - Philadelphia, PA, US Inventor: Sen-Shyong FANN USPTO Applicaton #: 20070080956 - Class: 345207000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070080956. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED FIELD OF THE INVENTION [0001] The invention relates to a display device. More specifically, the invention relates to interactive display devices and methods of making the same. BACKGROUND OF THE INVENTION [0002] Display devices traditionally serve the role of displaying the information or the output from a system, while other input device or devices provide inputs to the system. Interactive devices, such as a touch panel that can receive a user's input via touching the display panel, combines both output and input functions and allow a user to interact with the display or the system coupled to the display. As an example, devices such as personal digital assistants (PDAs), mobile phones, personal computers (PCs), tablet PCs (PC), etc. have incorporated touch panels for providing users with more choices in providing inputs to or operate a system. [0003] Conventional touch panels or touch screens have a number of different designs, such as resistive type, surface-wave type, capacitive type, and infrared-ray type designs. However, all of these designs typically require combining a display device with a separate touch panel sheet or structure, which may affect the quality of the display, increase the weight and size of an existing display device, and, usually unavoidably, significantly increase the manufacturing cost and time of the combined device. Additionally, the various designs also have associated drawbacks. For example, certain touch panel designs require the panel to first store a received input information in a capacitor before such information is subsequently read. Such requirement, in some examples, may occupy additional area by having additional touch panel structure that provides the input-maintaining capacitors. The design is not ideal, as it may reduce the aperture ratio of a display device when area is limited and display efficiency or brightness is desired. Additionally, depending on the panel design and the dynamic ranges of input information, the capacitors associated with the touch panel may not provide adequate dynamic ranges for storing and identifying all ranges of inputs. As another example, some designs may be vulnerable to non-input noises, such as noises caused by the ambient light, the back light of the displayed information itself, and other forms of electrical, magnetic, or electromagnetic influence. [0004] Therefore, there is a need for a display device that is interactive while providing some advantages over or resolve one or more drawbacks of traditional touch panels. For example, there may be a need for interactive display devices with simplified manufacturing processes, reduced sizes or thicknesses, or increased dynamic ranges in receiving input devices of different kinds or levels. BRIEF SUMMARY OF THE INVENTION [0005] Examples consistent with the present invention may provide an interactive display device. In one example, the interactive display device may include: a first substrate and a second substrate spaced apart from each other for providing a display area; a plurality of display control elements in a first matrix over the first substrate; a plurality of first data lines over the first substrate, each of the first data lines being coupled with one or more corresponding display control elements; and a plurality of first scan lines over the first substrate, each of the first scan lines being coupled with one or more corresponding display control elements. Additionally, the interactive display device may further include: a plurality of photo sensors in a second matrix over the first substrate, the photo sensors providing an interface for receiving input information; a plurality of second data lines over the first substrate, each of the second data lines being coupled with one or more corresponding photo sensors; and a plurality of second scan lines over the first substrate, each of the second scan lines being coupled with one or more corresponding photo sensors for activating the at least one corresponding photo sensor. [0006] In another example, an interactive display device may include: a first substrate and a second substrate spaced apart from each other for providing a display area; a plurality of display control elements in a first matrix over the first substrate; a plurality of first data lines over the first substrate, each of the first data lines being coupled with one or more corresponding display control elements; a plurality of first scan lines over the first substrate, each of the first scan lines being coupled with one or more corresponding display control elements. The display control element may further include: a plurality of photo sensors in a second matrix over the first substrate, the photo sensors providing an interface for receiving input information; and a plurality of second data lines over the first substrate, each of the second data lines being coupled with one or more corresponding photo sensors. In this example, some of the first scan lines may be coupled to one or more corresponding photo sensors for activating the corresponding photo sensors. [0007] In still another example, an interactive display device may include: a first substrate and a second substrate spaced apart from each other for providing a display area; a plurality of display control elements in a first matrix over the first substrate; a plurality of first data lines over the first substrate, each of the first data lines being coupled with one or more corresponding display control elements; a plurality of first scan lines over the first substrate, each of the first scan lines being coupled with one or more corresponding display control elements; a plurality of photo sensors in a second matrix over the first substrate, the photo sensors providing an interface for receiving input information, wherein the second matrix overlap with a portion of the first matrix so that some of the photo sensors are adjacent to or in the proximity of some of the display control elements. BRIEF DESCRIPTION OF THE DRAWINGS [0008] FIG. 1 is a schematic diagram illustrating an interactive display in examples consistent with the invention; [0009] FIG. 2A is a schematic diagram illustrating an example of photo sensors used in an interactive display device in examples consistent with the invention; [0010] FIG. 2B is a schematic diagram illustrating another example of photo sensors of used in an interactive display device in examples consistent with the invention; [0011] FIG. 3A is a cross-sectional diagram illustrating an exemplary structure of a photo transistor; [0012] FIG. 3B is an top view of the photo transistor illustrated in FIG. 3A; [0013] FIG. 3C is a top view showing a possible arrangement of photo sensor regions without sharing a common drain; [0014] FIG. 4A is a cross-sectional diagram illustrating an exemplary structure of a photo sensor; [0015] FIG. 4B is a top view of the photo sensor illustrated in FIG. 4A; and [0016] FIG. 4C is a top view showing a possible arrangement of photo sensor regions of without sharing a common drain. DETAILED DESCRIPTION OF THE INVENTION [0017] Examples consistent with the invention may provide interactive display devices and the methods of forming interactive display devices. The interactive display devices may have display control elements arranged in a first matrix and photo sensors arranged in a second matrix. In some examples, the photo sensors may be fabricated together with display control elements such as transistors or thin-film transistors ("TFTs") without requiring additional semiconductor layers or structures to be formed over a substrate. In other words, some examples allow the input or interactive function of a display device be incorporated into a display device without complicating the fabrication process or significantly increasing the fabrication cost. In some examples, a transistor having its gate and drain electrically coupled or two or more transistors with similar configuration may be used for proving photo transistors without occupying too much substrate area. In some examples, interactive display devices may use the input information for various applications, including recognizing hand-writings, recognizing other inputted characters or drawings, and identifying tapping, different forms of tapping or touching, or multi-tapping for different applications. Additionally, interactive display devices may accept various forms of input devices or instruments, including a pen, a stylus, a finger, or any other instruments. [0018] FIG. 1 is a schematic diagram illustrating examples of an interactive display device consistent with the invention. Referring to FIG. 1, interactive display device 200 may include two substrates 202 and 204 spaced apart from each other for providing a display area therebetween. In addition, display device 200 may include a number of display control elements 210 arranged in a first matrix over substrate 202, and display control elements 210 may control the information displayed by the display area. Display device 200 also include a number of first data lines 212 over substrate 202, and each of first data lines 212 may be coupled with at least one corresponding display control element 210. In the example illustrated in FIG. 1, all the display control elements 210 in the same horizontal level (along the x direction) may be coupled to one data line 212 that extends horizontally. Display device 200 also include a number of first scan lines 214 over substrate 202, and each of the first scan lines 214 may be coupled with at least one corresponding display control element 210. In the example illustrated in FIG. 1, all the display control elements 210 along the same vertical line (along the y direction) may be coupled to one scan line 214 that extends vertically. [0019] In addition to display control elements 210, display device 200 may also include a number of photo sensors 220 arranged in a second matrix over the first substrate, and the photo sensors 220 may serve as an interface for receiving input information. Display device 200 may also include a number of second data lines 222 (dashed, x-direction lines) over substrate 202, and each of the second data lines 222 may be coupled with at least one corresponding photo sensor. In one example, although the interactive display device 200 may use separate data lines in many applications, some of the first data lines 212 may be shared or used as some of the second data lines 222, depending on the design. In addition, in the example illustrated in FIG. 1, all the photo sensors 220 in the same horizontal level (along the x direction) may be coupled to one data line that extends horizontally. Display device 200 may also include a number of second scan lines 224 (dashed, y-direction lines) over substrate 202, and each of the second scan lines 224 may be coupled with at least one corresponding photo sensor 220 for activating the at least one corresponding photo sensor 220. In one example, some of the first scan lines 214 may be shared or used as some of the second scan lines 224, depending on the design. In addition, in the example illustrated in FIG. 1, all the photo sensors 220 in the same vertical position (along the y direction) may be coupled to one scan line 224 that extends vertically. Continue reading... Full patent description for Interactive display devices and methods of making the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Interactive display devices and methods of making the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. 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