Interactive Display Devices And Methods Of Making The Same
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.
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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 INVENTIONDisplay 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.
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.
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 INVENTIONExamples 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.
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.
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
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.
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
In some examples, interactive display device 200 may be coupled to a computing system that is capable of providing the information being displayed by the display area and being controlled by the input information received by the interactive display device. Also, by using appropriate processing or sensing circuit, photo sensors 220 may provide location information of a light beam projected onto interactive display device 200 or of an object or a shadow of the object on or near the interactive display device. In other words, the light beam or the object may provide input information to interactive display device 200.
Referring to
Accordingly, in this example, viewing an interactive display device as a whole, the illumination levels at various areas of the display device may be obtained by scanning all the scan lines, usually sequentially. And the current flowing through the photo sensors connected to the same data line may be read out at different timing and processed accordingly, such as by a processing or sensing circuit, which is illustrated in
Referring to
Referring to
Accordingly, in this example, viewing an interactive display device as a whole, the illumination levels at various areas of the display device may be obtained by scanning all the scan lines, usually sequentially. And the current flowing through the photo sensors connected to the same data line may be read out at different timing and processed accordingly, such as by a processing or sensing circuit, which is illustrated in
In some examples, the display function for an interactive display device may be controlled by transistors, such as thin-film transistors (TFTs). One example of the display device includes an LCD (liquid crystal display) or TFT-LCD. As an example, the fabrication of an LCD panel involves forming transistors and other components over one substrate and combining the substrate with another substrate to enclose liquid crystal, which may be controlled by control elements such as TFTs, between the two substrates. In this and some other examples, the photo sensors and other display control elements of an interactive display device may be fabricated together during the fabrication process, such as a fabrication process involving forming semiconductor layers over a substrate. In other words, the input function or interactive part of the display device may be incorporated into a regular display device without burdening or complicating the manufacturing process of display devices. Furthermore, because the interactive display devices in those examples would not require a separate sheet for providing the touch panel or panel input function, the display quality and reliability of the display devices may be improved.
As illustrated above, examples consistent with the invention provide interactive display devices and the methods of forming interactive display devices. In some examples, the photo sensors may be fabricated together with display control elements such as transistors or thin-film transistors without requiring additional semiconductor layer to be formed over a substrate. As an example, conventional processes of fabricating TFT-LCDs can be modified to make interactive display devices by modifying a few pattern-defining masks, such as the masks for defining the TFTs and related components. Accordingly, the input or interactive function of a display device may be added without complicating the fabrication process or significantly increasing the fabrication cost. Furthermore, effective channel widths of photo sensors or photo transistors may be increased with the illustrated structures without requiring too much additional substrate area.
Although the display control elements and the photo sensors may be fabricated together, they do not need to be distributed over a display device with the same density. That is, the density of the photo sensors may be lower than the density of display control elements. In other words, the first matrix containing display control elements and the second matrix containing the photo sensors can be arranged so that the second matrix generally overlaps with only a portion of the first matrix. In one example, the number of the display control elements in a horizontal direction is x times the number of the photo sensors in the horizontal direction and the number of the display control elements in a vertical direction is y times the number of the photo sensors in the vertical direction. Each of x and y may be integer in one example. For example, for a display device having a resolution of 1280×1024 pixels, the number of photo sensors can be 320×256 in one example or 256×128 in another example. And various other designs of photo sensor distributions may be used depending on designs, applications, or various other design considerations.
It will be appreciated by those skilled in the art that changes could be made to the examples described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular examples disclosed, but it is intended to cover modifications within the spirit and scope of the present invention.
Claims
1. An interactive display device comprising:
- 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, the display control elements controlling the information displayed by the display area;
- a plurality of first data lines over the first substrate, each of the first data lines being coupled with at least one corresponding display control element;
- a plurality of first scan lines over the first substrate, each of the first scan lines being coupled with at least one corresponding display control element;
- 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 at least one corresponding photo sensor; and
- a plurality of second scan lines over the first substrate, each of the second scan lines being coupled with at least one corresponding photo sensor for activating the at least one corresponding photo sensor.
2. The interactive display device according to claim 1, wherein the interactive display device is coupled to a computing system that is capable of providing the information being displayed by the display area and being controlled by the input information received by the interactive display device.
3. The interactive display device according to claim 1, wherein at least some of the first scan lines also act as the second scan lines.
4. The interactive display device according to claim 1, wherein at least some of the first data lines also act as the second data lines.
5. The interactive display device according to claim 1, wherein each of the photo sensors comprises a photo transistor comprising:
- a gate coupled to a corresponding second scan line;
- a drain region coupled to one of a voltage source or the gate terminal; and
- a source region coupled to a corresponding second data line.
6. The interactive display device according to claim 1, wherein each of the photo sensors comprises a photo transistor comprising:
- a photo transistor gate coupled to a voltage source;
- a photo transistor drain region coupled to the voltage source; and
- a photo transistor source region; and
- a switching transistor comprising:
- a switching transistor gate coupled to a corresponding second scan line;
- a switching transistor drain region coupled to the photo transistor source region; and
- a switching transistor source region coupled to a corresponding second data line.
7. The interactive display device according to claim 1, wherein the first matrix and the second matrix are arranged so that the number of the display control elements in a horizontal direction is x times the number of the photo sensors in the horizontal direction and the number of the display control elements in a vertical direction is y times the number of the photo sensors in the vertical direction, wherein each of x and y is an integer.
8. The interactive display device according to claim 1, wherein the photo sensors provide location information of at least one of a light beam projected onto the interactive display device and an object or a shadow of the object on or near the interactive display device, wherein at least one of the light beam and the object provides an input information to the interactive display device.
9. The interactive display device according to claim 1, wherein each of the photo sensors comprises a dual-transistor photo transistor having a gate, two source regions, and one shared drain region.
10. The interactive display device according to claim 1, wherein the photo sensors and the display control elements comprise semiconductor components that are fabricated together.
11. The interactive display device according to claim 1, wherein the second data lines are coupled to an object shadow analysis circuit.
12. An interactive display device comprising:
- 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, the display control elements controlling the information displayed by the display area;
- a plurality of first data lines over the first substrate, each of the first data lines being coupled with at least one corresponding display control element;
- a plurality of first scan lines over the first substrate, each of the first scan lines being coupled with at least one corresponding display control element;
- a plurality of photo sensors in a second matrix over the first substrate, the photo sensors providing an interface for receiving input information, wherein at least some of the first scan lines are coupled to at least one corresponding photo sensor for activating the at least one corresponding photo sensor; and
- a plurality of second data lines over the first substrate, each of the second data lines being coupled with at least one corresponding photo sensor.
13. The interactive display device according to claim 12, wherein the interactive display device is coupled to a computing system that is capable of providing the information being displayed by the display area and being controlled by the input information received by the interactive display device.
14. The interactive display device according to claim 12, wherein each of the photo sensors comprises a photo transistor comprising:
- a gate coupled to a corresponding first scan line;
- a drain region coupled to one of a voltage source or the gate terminal; and
- a source region coupled to a corresponding second data line.
15. The interactive display device according to claim 12, wherein each of the photo sensors comprises a photo transistor comprising:
- a photo transistor gate coupled to a voltage source;
- a photo transistor drain region coupled to the voltage source; and
- a photo transistor source region; and
- a switching transistor comprising:
- a switching transistor gate coupled to a corresponding first scan line;
- a switching transistor drain region coupled to the photo transistor source region; and
- a switching transistor source region coupled to a corresponding second data line.
16. The interactive display device according to claim 12, wherein the first matrix and the second matrix are arranged so that the number of the display control elements in a horizontal direction is x times the number of the photo sensors in the horizontal direction and the number of the display control elements in a vertical direction is y times the number of the photo sensors in the vertical direction, wherein each of x and y is an integer.
17. The interactive display device according to claim 12, wherein the photo sensors provide location information of at least one of a light beam projected onto the interactive display device and an object or a shadow of the object on or near the interactive display device, wherein at least one of the light beam and the object provides an input information to the interactive display device.
18. The interactive display device according to claim 12, wherein each of the photo sensors comprises a dual-transistor photo transistor having a gate, two source regions, and one shared drain region.
19. The interactive display device according to claim 12, wherein the photo sensors and the display control elements comprise semiconductor components that are fabricated together.
20. The interactive display device according to claim 12, wherein the second data lines are coupled to an object shadow analysis circuit.
21. An interactive display device comprising:
- 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, the display control elements controlling the information displayed by the display area;
- a plurality of first data lines over the first substrate, each of the first data lines being coupled with at least one corresponding display control element;
- a plurality of first scan lines over the first substrate, each of the first scan lines being coupled with at least one 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.
Type: Application
Filed: Sep 28, 2006
Publication Date: Apr 12, 2007
Applicant: INTEGRATED DIGITAL TECHNOLOGIES, INC. (Hsinchu)
Inventor: Sen-Shyong FANN (Hsinchu)
Application Number: 11/536,403
International Classification: G09G 5/00 (20060101);