WO2008002043A1 - Method and system for providing touch sensing function to organic light emitting diode - Google Patents
Method and system for providing touch sensing function to organic light emitting diode Download PDFInfo
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- WO2008002043A1 WO2008002043A1 PCT/KR2007/003066 KR2007003066W WO2008002043A1 WO 2008002043 A1 WO2008002043 A1 WO 2008002043A1 KR 2007003066 W KR2007003066 W KR 2007003066W WO 2008002043 A1 WO2008002043 A1 WO 2008002043A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
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- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
The present invention relates to a method and system for providing a touch sensing function to organic light emitting diodes (OLED). The present invention provides a method for providing a touch sensing function to a pixel of organic light emitting diodes (OLED), the method comprising the steps of : (a) causing the OLED pixel to emit light by generating a driving power corresponding to a relevant value of received information about a pixel to be displayed, and charging a comparison voltage capacitor and a reference voltage capacitor by means of the driving power; (b) checking if a touch has been sensed from by the OLED pixel by comparing the comparison voltage capacitor with the reference voltage capacitor; and (c) outputting a sense signal corresponding to a logic value for the touch when it is determined in step (b) that the touch has been sensed by the OLED pixel.
Description
METHOD AND SYSTEM FOR PROVIDING TOUCH SENSING FUNCTION TO ORGANIC LIGHT EMITTING DIODE
Technical Field The present invention relates to a method and system for providing a touch sensing function to organic light emitting diodes (OLED). More particularly, the present invention relates to a method and system for providing a touch sensing function to OLED by adding a measurement circuit for sensing minute electric charges to a driving circuit which drives the OLED.
Background Art
Recently, design in electronic devices has been regarded to be important for product differentiation. Especially, such a tendency is more remarkable in electronic devices, such as plasma televisions, liquid crystal televisions, and IH cooking heaters, particularly when the electronic devices are high end. Also, there is an increasing demand of customers for a flat-shaped touch sensor having no driving unit as a control device that does not damage the design of electronic devices. The touch sensors are classified into an optical-type touch sensor, a propagation-type touch sensor, and a capacitance-
type touch sensor according to the detecting methods thereof, in which the capacitance-type touch sensor has the simplest structure. However, since the conventional capacitance-type touch sensors mostly employs a touch scheme exposing an electrode, the user's hand is directly touches the exposed electrode, so that the capacitance-type touch sensors are weak against static electricity, which causes a limitation on the design of electronic devices. In contrast, since touch sensors of a non-touch scheme do not require the user's hand to directly touch an electrode and are constructed in such a manner as to protect electrodes with non-conductive material, such as glass, acryl, fabrics, and marble, covered thereon, the touch sensors of the non-touch scheme are robust to static electricity, and do not have a limitation on the design of electronic devices. Accordingly, the demand for the capacitance-type touch sensors of the non-touch scheme is increasing.
Meanwhile, since the organic light emitting diode (OLED) gives bright and colorful light, enables rapid switching, provides a wide viewing angle, can be easily manufactured on various substrates, and is low-priced, the OLED has a wide application range not only as the next generation display for display-based products, such as televisions, personal computers, mobile terminals, and electric home appliances,
but also as new functional devices, such as electronic papers, illuminators, etc., other than the display function. FIG. 1 is a view illustrating the basic structure of a general OLED. An OLED 100 includes a substrate 110, an Indium Tin Oxide (ITO) transparent electrode 120, a hole injection layer 130, a hole transport layer 132, a light-emitting layer 140, an electron transport layer 150, an electron injection layer 152, and a rear electrode 160. The substrate 110 made of glass or plastic supports the ITO transparent electrode 120, on which the hole injection layer 130, the hole transport layer 132, the light-emitting layer 140, the electron transport layer 150, the electron injection layer 152, and the rear electrode 160 are deposited. In the light-emitting layer 140, holes injected from the ITO transparent electrode 120 and electrons injected from the rear electrode 160 are recombined. By the recombination reaction, organic molecules are excited into an excited state. Also, the organic molecules increases the energy level thereof from a stable ground state to an unstable excited state of a high energy level due to the recombination energy, and the organic molecules generate light while emitting energy when the organic molecules return to the original state.
The OLED 100 functions as one pixel, and a plurality of pixels are arranged in a matrix form in order to be used as a display screen for a PC monitor, a television, etc. Recently, as the user interface environment of electric devices is changing into a graphic user interface (GUI), touch sensors connected with an input function are widely utilized in display devices, such as OLED, LCD, etc. FIG. 2 is a view schematically illustrating the structure of a general touch screen display device. According to the touch screen display device 200, a touch sensor film 220 is covered on a display substrate 210 implemented by an LCD or OLED 100, so that when a touch by a user's finger is sensed, a corresponding signal is transmitted to a touch screen signal processing unit 230. Then, the touch screen signal processing unit 230 converts the coordinate value of the touched point into a digital code, and transfers the digital code to another device, thereby performing the function of the touch screen display device. FIG. 3 is a view illustrating the physical structure of an active panel using a conventional OLED.
An OLED display panel is implemented by arranging OLED pixels in the two dimensions, wherein transistors and capacitors for a memory within OLED pixels arranged on the
active panel are generally implemented by a thin film transistor (TFT) circuit using Low Temperature Poly Silicon (LTPS) on the rear surface of the ITO transparent electrode 120. FIG. 4 is a block diagram illustrating the internal construction of a conventional active matrix EL driver, and a TFT circuit in which a transistor and a capacitor for a memory are implemented by using the LTPS. An input/output interface 410 receives the frame value of a screen to be displayed from a main processor in a device using the display or a processor taking charge of graphics therein. Based on the frame value input through the input/output interface 410, a white balance module 430 determines reference brightness of RGB elements, and a DAC module 432 generates a voltage value or current value for driving OLED pixels according to the input frame value. A timing controller 420 controls a scan controller 440 so that a corresponding driving voltage value or current value can be transferred to OLED pixels in synchronization with the cycle of an output screen, and an output column driver 434 receives the voltage value or current value generated by the DAC module 432 and transmits the received voltage value or current value to corresponding OLED pixels. A charging/discharging module 436 functions as a reset
module to return light-emitted active OLED pixels to an initial state, and performs the reset operation under the control of the timing controller 420.
In order for OLED pixels to emit light, the active matrix EL driver sequentially and repeatedly performs three steps of recording current, emitting light by EL, and resetting. In the current recording step, current controlled by the EL driver according to a control signal from an exterior is accumulated as electric charges in the capacitor 470 for a memory within a TFT equivalent circuit 450, in which an input signal is converted into a gate-source voltage of a transistor for driving EL.
To this end, in the current recording step, a first scan node 460 and a data node 464 are connected to the ground, and a second scan node 462 is connected to Vcc.
In the EL light-emitting step, a signal converted into the gate-source voltage in the current recording step is converted into current in the TFT equivalent circuit 450, and causes current to flow through an organic EL equivalent circuit 480, thereby emitting light. In this step, the output of the active matrix EL driver 400 becomes OFF, thereby having a high impedance.
To this end, in the EL light-emitting step, the first scan node 460 is connected to Vcc, the second scan node 462 is
connected to the ground, and the data node 464 has a high impedance.
In the reset step, the organic EL equivalent circuit 480 emitting light is reset to a black recording state. During this step, the output of the active matrix driver is maintained at a finite voltage value, which is necessary for making a "black level" to shorten a period of time which is required for the organic EL equivalent circuit 480 to shift an OFF state to an ON state to emit light. Generally, a voltage applied to the data node 464 is set to a lower value than Vcc so that a predetermined voltage difference can be maintained, thereby implementing the reset step. To this end, in the reset step, the first scan node 460 is connected to the ground, and the second scan node 462 and data node 464 are connected to Vcc.
However, in order to implement a touch sensing function in a display device including the conventional OLED 100, a high- priced touch sensor film 220 having a touch sensing function and a touch screen signal processing unit 230 for processing signals must be separately installed on the display substrate 210.
Disclosure of the Invention
Accordingly, the present invention has been made to
solve the above-mentioned problems occurring in the prior art, and the present invention provides a method and system for providing a touch sensing function to organic light emitting diodes (OLED) by adding a measurement circuit for sensing minute electric charges to a driving circuit which drives the OLED.
According to a first aspect of the present invention, there is provided a method for providing a touch sensing function to a pixel of organic light emitting diodes (OLED), the method comprising the steps of: (a) causing the OLED pixel to emit light by generating a driving power corresponding to a relevant value of received information about a pixel to be displayed, and charging a comparison voltage capacitor and a reference voltage capacitor by means of the driving power; (b) checking if a touch has been sensed from by the OLED pixel by comparing the comparison voltage capacitor with the reference voltage capacitor; and (c) outputting a sense signal corresponding to a logic value for the touch when it is determined in step (b) that the touch has been sensed by the OLED pixel.
According to a second aspect of the present invention, there is provided a system for providing a touch sensing function to a pixel of organic light emitting diodes (OLED), the system comprising: an OLED driver for causing the OLED
pixel to emit light by generating a driving power to output light corresponding to pixel information about the OLED pixel, which has been input from an external interface; a comparison voltage capacitor connected in parallel to the OLED pixel so as to be charged while the OLED pixel emits light by the driving power of the OLED driver; a reference voltage capacitor having a capacitance equal to that of the comparison voltage capacitor, the reference voltage capacitor being charged while the OLED pixel emits light by the driving power of the OLED driver; an OLED equivalent circuit having a resistance value equal to that of the OLED pixel, the OLED equivalent circuit being connected in parallel to the reference voltage capacitor so that the reference voltage capacitor and the comparison voltage capacitor are charged to an equal capacity; and a comparison detecting module connected to the comparison voltage capacitor and the reference voltage capacitor, the comparison detecting module checking if a touch is sensed by comparing a voltage change according to an electric charge change in the comparison voltage capacitor with a voltage change in the reference voltage capacitor.
According to a third aspect of the present invention, there is provided a method for providing a touch sensing function to a pixel of organic light emitting diodes (OLED)
connected to a thin film transistor (TFT) by using application software, the method comprising the steps of: (a) connecting a touch sensing capacitor to a data node of an OLED pixel (hereinafter, referred to as an "input-area OLED pixel") within an input area set by the application software, and connecting a reference capacitor to a data node of an OLED pixel (hereinafter, referred to as a "non- input-area OLED pixel") within an area other than the input area; (b) comparatively sensing, by a comparison detecting module, current signals input from the touch sensing capacitor and the reference capacitor; and (c) generating a sense signal notifying that a touch has been sensed when the current signals input from the touch sensing capacitor and the reference capacitor in step (b) are not equal to each other.
According to a fourth aspect of the present invention, there is provided a system for providing a touch sensing function to a pixel of organic light emitting diodes (OLED) connected to a thin film transistor (TFT) by using application software, the system comprising: a touch sensing capacitor connected to a data node of an OLED pixel (hereinafter, referred to as an "input-area OLED pixel") within an input area established by the application software; a reference capacitor connected to a data node of
an OLED pixel (hereinafter, referred to as a "non-input-area OLED pixel") within an area other than the input area established by the application software; and a comparison detecting module connected to the touch sensing capacitor and the reference capacitor, the comparison detecting module checking if a touch is sensed on the OLED pixel by comparing current signals input from the touch sensing capacitor and the reference capacitor.
According to a fifth aspect of the present invention, there is provided a method for providing a touch sensing function to an organic light emitting diodes (OLED) display by using application software, the method comprising the steps of: (a) generating touch sense coordinates corresponding to each piece of graphic frame information, by using the graphic frame information generated by the application software; (b) transmitting the graphic frame information to an OLED driver, and transmitting the touch sense coordinates to a Switch Mapping Mux Register (SMMR); (c) performing a control operation such that a screen corresponding to the graphic frame information is displayed on an OLED display panel, and performing a control operation such that a switch of each detecting module in a comparison detecting module is connected to the touch sense coordinates; (d) checking if there is an input from the
touch sense coordinates; and (e) generating and transmitting touch sense information to an output register when it is determined in step (d) that there is an input from the touch sense coordinates, and generating a sense signal by the output register.
According to a sixth aspect of the present invention, there is provided a system for providing a touch sensing function to an organic light emitting diodes (OLED) display by using application software, the method comprising the steps of: an OLED display panel configured by two- dimensionally arranging OLED pixels; an OLED driver for generating a driving power which causes the OLED display panel to emit light; a main processor for performing a control operation such that graphic frame information generated by the application software is transmitted to the OLED driver, and generating touch sense coordinate information corresponding to each piece of the graphic frame information; a comparison detecting module connected to touch sense coordinates corresponding to the touch sense coordinate information, the comparison detecting module generating touch sense information when an input is generated to the touch sense coordinates; a Switch Mapping Mux Register (SMMR) for receiving the touch sense coordinate information from the main processor and controlling the
comparison detecting module, so as to switch each detecting module to be connected to the touch sense coordinates; and an output register for receiving the touch sense information from the comparison detecting module, and generating and transmitting a sense signal corresponding to the touch sense information to the main processor.
Brief Description of the Drawings
The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:
FIG. 1 is a view illustrating the structure of a general organic LED (OLED); FIG. 2 is a view schematically illustrating the structure of a general touch screen display device;
FIG. 3 is a view illustrating the physical structure of an active panel using a conventional OLED;
FIG. 4 is a block diagram illustrating the internal construction of a conventional active matrix EL driver, and a TFT circuit in which a transistor and a capacitor for a memory are implemented by using Low Temperature Poly Silicon
(LTPS);
FIG. 5 is a view illustrating a system for providing a touch
sensing function to OLED according to a first exemplary embodiment of the present invention;
FIG. 6 is a view illustrating an equivalent circuit for providing the touch sensing function to the OLED according to a second exemplary embodiment of the present invention;
FIG. 7 is a view schematically illustrating the configuration of a system for providing the touch sensing function to an OLED display according to an exemplary embodiment of the present invention; FIG. 8 is a flowchart illustrating the procedure for providing the touch sensing function by the OLED driver IC according to an exemplary embodiment of the present invention; FIG. 9 is a flowchart illustrating a procedure of providing a fingerprint recognition function by an OLED display panel according to an exemplary embodiment of the present invention;
FIG. 1OA is a view illustrating a screen image provided as an input screen for fingerprint recognition by application software according to an exemplary embodiment of the present invention;
FIG. 1OB is a view illustrating touch sense OLED pixels arranged at predetermined intervals on the input screen for fingerprint recognition according to an exemplary embodiment
of the present invention;
FIG. 1OC is a view illustrating touch sense OLED pixels rearranged for fingerprint recognition according to an exemplary embodiment of the present invention; and FIG. 1OD is a view illustrating an image of a fingerprint recognized by an OLED display providing the touch sensing function according to an exemplary embodiment of the present invention.
Best Mode for Carrying Out the Invention
Hereinafter, one exemplary embodiment of the present invention will be described with reference to the accompanying drawings. It is to be noted that the same elements are indicated with the same reference numerals throughout the drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention. FIG. 5 is a view illustrating a system for providing a touch sensing function to organic light emitting diodes (OLED) according to a first exemplary embodiment of the present invention.
The system for providing a touch sensing function to OLED according to an exemplary embodiment of the present
invention includes an OLED driving apparatus 500 and an OLED pixel 562, in which the OLED driving apparatus 500 includes a reference voltage capacitor 510, an OLED-pixel equivalent resistor 512, a first routing switch unit 520, first routing node A 522, first routing node B 524, first routing node C 526, a second routing switch unit 530, second routing node A 532, second routing node B 534, second routing node C 536, an OLED driver 540, a driver switch unit 550, driver node A 552, driver node B 554, a comparison voltage capacitor 560, a comparison detecting module 570, and a voltage comparison detecting module's output node 572.
The OLED driver 540 receives pixel information (e.g. a color value) for display through an external interface, and drives OLED pixels to output light corresponding to the received pixel information. Although the output of the OLED driver 540 may be a voltage or current according to the construction thereof, the following description will be given about the case where the OLED driver 540 outputs a voltage, for a better understanding of the present invention. In order to drive an OLED pixel, the OLED driver 540 connects the driver node A 552 and driver node B 554 of the driver switch unit 550, and connects the second routing node A 532 and second routing node B 534 of the second routing switch unit 530, thereby driving the OLED pixel 562, in
which the comparison voltage capacitor 560 is charged by the driving power of the OLED driver 540.
Also, in order to charge the reference voltage capacitor 510 by the driving power of the OLED driver 540, when the driver node A 552 and driver node B 554 of the driver switch unit 550 are connected to each other, the OLED driver connects the first routing node A 522 and first routing node B 524 of the first routing switch unit 520, thereby charging the reference voltage capacitor 510 by the driving power of the OLED driver 540.
According to an exemplary embodiment of the present invention, the reference voltage capacitor 510 and the comparison voltage capacitor 560 have the same capacitance, and the reference voltage capacitor 510 is connected to the OLED-pixel equivalent resistor 512, so that two input nodes of the comparison voltage capacitor 560 and reference voltage capacitor 510 have the same voltage.
In order to drive a touch sensing function after the OLED pixel 562 has been driven, the OLED driving apparatus 500 connects the first routing node A 522 and first routing node C 526 of the first routing switch unit 520, and connects the second routing node A 532 and second routing node C 536 of the second routing switch unit 530, thereby connecting the reference voltage capacitor 510 and the comparison voltage
capacitor 560 to the input nodes of the comparison detecting module 570.
In this case, since both input nodes of the comparison detecting module 570 have the same electrical conditions, the voltages of both input nodes are the same.
In the state in which the reference voltage capacitor 510 and comparison voltage capacitor 560 are connected to the input nodes of the comparison detecting module 570, when the user touches the OLED pixel 562, the human body's minute electric charge exerts an influence on the quantity of electric charge stored in the comparison voltage capacitor 560, thereby increasing or decreasing the quantity of the stored electric charge. Since such an increase or decrease in the quantity of the stored electric charge results in a voltage change, the comparison detecting module 570 outputs a sensed voltage change as a voltage value or digital level, which corresponds to a logic value.
FIG. 6 is a view illustrating an equivalent circuit for providing the touch sensing function to the OLED according to a second exemplary embodiment of the present invention.
The above description has been given about the system providing the touch sensing function to the OLED according to the first exemplary embodiment of the present invention. However, generally, display devices using the OLED are
implemented with an active matrix EL driver 400 and a thin film transistor (TFT) equivalent circuit 450 using Low Temperature Poly Silicon (LTPS). The system for providing the touch sensing function to a display device using the organic EL driver 400 and the TFT equivalent circuit 450 will now be described with reference to FIG. 6. According to the second exemplary embodiment of the present invention, an equivalent circuit for providing the touch sensing function to the OLED includes an OLED display matrix panel 600 and an OLED driver IC 630 for providing the touch sensing function. The OLED display matrix panel 600 includes a first TFT circuit 610, a first OLED equivalent circuit 612, a first ITO transparent electrode 614, a first data node 616, a second TFT circuit 620, a second OLED equivalent circuit 622, a second ITO transparent electrode 624, and a second data node 626. The OLED driver IC 630 includes a comparison detecting module 632, a touch sensing capacitor 634, and a reference capacitor 636. The OLED driver IC 630 for providing the touch sensing function according to an exemplary embodiment of the present invention is connected to the data nodes of the TFT circuits so as to provide the touch sensing function according to application software. The application software according to an exemplary
embodiment of the present invention provides OLED pixel coordinate information about an input area, together with graphic frame information, in order to provide the touch sensing function to the OLED display. The application software performs a control operation in such a manner as to connect OLED pixels in an input area to the touch sensing capacitor 634, and to connect OLED pixels in a non-input area to the reference capacitor 636. It can be said that there is a capacitor between a conductor and an ITO transparent electrode, which includes the first ITO transparent electrode 614 and second ITO transparent electrode 624. Therefore, when a user's finger touches the first ITO transparent electrode 614, this causes a change in the quantity of electric charge within a capacitor between the first ITO transparent electrode 614 and the user's finger. Such a change in the quantity of electric charge generates an alternating current signal, which is transferred to the comparison detecting module 632 through the touch sensing capacitor 634. Since the OLED pixels within the non-input area are not touched, there is no alternating current signal input to the reference capacitor 636 connected to the OLED pixels within the non-input area. Therefore, the comparison detecting module 632 detects that a touch has been sensed, and outputs
a voltage value or digital level corresponding to a logic value.
Although the present invention has been described about the case where the application software distinguishes between an input area and a non-input area and connects the input area and non-input area to the touch sensing capacitor 634 and reference capacitor 636 of the comparison detecting module 632, respectively, the application software may perform a control operation in such a manner as to connect the touch sensing capacitor 634 to the OLED pixel data node of an input area, and also connect the touch sensing capacitor 634 to the OLED pixel data node of a non-input area which has a pixel value equal to or similar to the OLED pixel value of the input area, so that the comparison detecting module can detect a touch.
In addition, the touch sensing capacitor 634 and reference capacitor 636 may include a pre-reset circuit so that when a reset step for OLED pixels is performed for light emitting of the next graphic frame, a rapid voltage change in the OLED pixels can be prevented, thereby preventing detailed image quality from being degraded.
FIG. 7 is a view schematically illustrating the configuration of a system for providing the touch sensing function to an OLED display according to an exemplary
embodiment of the present invention.
The system for providing the touch sensing function to an OLED display includes an OLED display panel 710, an OLED driver 720, a comparison detecting module 730, a Switch Mapping Mux Register (SMMR) 740, an output register 750, and a main processor 760, wherein the comparison detecting module 730 includes a first detecting module 732, a second detecting module 734, a third detecting module 736, and a fourth detecting module 738. The OLED display panel 710 includes OLED pixels arranged two-dimensionally, and an embodiment of the present invention will be described as having a system employing an 8x8 OLED display panel, for a better understanding of the present invention. The OLED driver 720 drives pixels of the OLED display panel to emit light according to graphic frame information received from the main processor 760.
According to an exemplary embodiment of the present invention, the comparison detecting module 730 includes the first detecting module 732, the second detecting module 734, the third detecting module 736, and the fourth detecting module 738, in which the comparison detecting module 730 receives sense coordinate information from the SMMR 740 and matches the respective detecting module with the sense
coordinate information. Although the exemplary embodiment of the present invention has been described as having the comparison detecting module having four detecting modules, the number of detecting modules may be determined by the manufacturers as they want. Since the size of the OLED driver IC becomes large and the manufacturing cost increases if the number of detecting modules is determined to be the same as the number of OLED pixels, it is preferred that the number of detecting modules is determined to be less than the number of OLED pixels.
According to an exemplary embodiment of the present invention, the SMMR 740 receives touch sense coordinate information from the main processor 760 and transmits the touch sense coordinate information to the comparison detecting module 730, so as to switch the comparison detecting module 730 to be connected to touch sense coordinates.
According to an exemplary embodiment of the present invention, the output register 750 receives touch sense information from the comparison detecting module 730, and generates and transmits a sense signal corresponding to the touch sense information to the main processor 760. According to an exemplary embodiment of the present invention, the main processor 760 generates graphic frame
information by the application software, in which the main processor 760 performs a control operation in such a manner as to transmit the generated graphic frame information to the OLED driver 720, and to transmit touch sense coordinates corresponding to each piece of graphic frame information to the SMMR 740.
The comparison detecting module 730, the SMMR 740, and the output register 750, which function to provide the touch sensing function to the OLED display panel 710, will be referred to as an "OLED driver IC" in the following description.
The application software according to an exemplary embodiment of the present invention functions to provide information about touch sense coordinates corresponding to graphic frame information to the main processor 760, in cooperation with the OLED driver IC. The main processor 760 receives information about touch sense coordinates corresponding to each piece of graphic frame information, and generates the touch sense coordinates. FIG. 8 is a flowchart illustrating the procedure for providing the touch sensing function by the OLED driver IC according to an exemplary embodiment of the present invention. When the application software to set touch sense coordinates
is executed, the main processor 760 generates graphic frame information according to the setting by the application software, and generates touch sense coordinates corresponding to each piece of graphic frame information (step 800) .
The main processor 760 transmits the graphic frame information to the OLED driver 720, and simultaneously transmits the touch sense coordinates to the SMMR 740 (step 802) . For example, when a screen displayed by the application software corresponds to a screen for selecting one of "Yes" and "No," the main processor 760 transmits the graphic frame information to the OLED driver 720 so that the screen for selecting one of "Yes" and "No" can be configured in the OLED display panel 710. At the same time, the main processor 760 generates the graphic frame coordinates for "Yes" and "No" as touch sense coordinates and transmits the generated touch sense coordinates to the SMMR 740 so that the comparison detecting module 730 can sense a touch on the screen of "Yes" and "No."
The OLED driver 720, having received the graphic frame information, controls a screen corresponding to the graphic frame information to be configured on the OLED display panel 710, and the SMMR 740, having received the touch sense
coordinates, controls the respective detecting module of the comparison detecting module 730 to be switched and connected to the touch sense coordinates (step 804).
The comparison detecting module 730 checks if there is an input from the touch sense coordinates of the OLED display panel 710 (step 806) .
For a better understanding of the present invention, it is assumed that the input corresponds to a touch of a user's finger on the touch sense coordinates of the OLED display panel 710.
When it is determined in step 806 that there is an input from the touch sense coordinates, the comparison detecting module 730 generates and transmits touch sense information to the output register 750, and the output register 750 generates and transmits a sense signal to the main processor 760 (step 808) .
When receiving the sense signal, the main processor 760 performs a procedure provided by the application software according to selection (step 810). FIG. 9 is a flowchart illustrating a procedure of providing a fingerprint recognition function by an OLED display panel according to an exemplary embodiment of the present invention. When fingerprint recognition application software is
executed, the main processor 760 generates graphic frame information of a screen for receiving a fingerprint, and generates touch sense coordinates at predetermined intervals on an input window for receiving a fingerprint (step 900). The main processor 760 transmits the generated graphic frame information to the OLED driver 720, and simultaneously transmits the touch sense coordinates to the SMMR 740 (step 902) . The OLED driver 720 drives the OLED display panel 710 according to the graphic frame information so as to configure an input screen 1000 for fingerprint recognition, as shown in FIG. 1OA, and the SMMR 740 controls the comparison detecting module 730 to be switched and connected to OLED pixels corresponding to touch sense coordinates of an input window 1010 for fingerprint recognition (step 904). When a user's finger touches the input window 1010 for fingerprint recognition, as shown in FIG. 1OB, the comparison detecting module 730 generates and transmits touch sense information to the output register 750, and the output register 750 generates and transmits a sense signal to the main processor 760 (step 906).
According to an exemplary embodiment of the present invention, the sense signal transmitted by the output register 750 includes information about touch sense
coordinates at which a touch has been sensed. The main processor 760 calculates the central coordinates of the touch sense coordinates, at which a touch has been sensed, by analyzing the received sense signal; generates rearranged touch sense coordinates by rearranging the touch sense coordinates, which have been arranged at predetermined intervals, with respect to the central coordinates of the touch sense coordinates, at which a touch has been sensed; and transmits the rearranged touch sense coordinates to the SMMR 740 (step 908).
Generally, it takes one to three seconds to recognize a fingerprint on an input window for fingerprint recognition. Therefore, at the moment when a user's finger touches the input window for fingerprint recognition, the main processor 760 rearranges touch sense coordinates so as to generate rearranged touch sense coordinates, rearranges the touch sense coordinates with respect to the central coordinates of the touch sense coordinates touched by the user's finger as shown in FIG. 1OC, and recognizes a user's fingerprint. The SMMR 740 controls the comparison detecting module 730 to be connected to OLED pixels corresponding to the rearranged touch sense coordinates, the comparison detecting module 730 generates and transmits touch sense information according to fingerprint recognition to the output register 750, and the
output register 750 generates and transmits a sense signal to the main processor 760 (step 910).
The main processor 760 generates a fingerprint, which has been input on the input window for fingerprint recognition, as an image shown in FIG. 1OD based on the sense signal, and performs the following procedure provided by the fingerprint recognition application software, such as a procedure of comparing the generated image with fingerprints pre-stored in the fingerprint recognition application software, a procedure of storing the generated image, etc.
Although an exemplary embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, the embodiment disclosed in the present invention has been described not for limiting the scope of the invention, but for describing the invention. Accordingly, the scope of the invention is not to be limited by the above embodiment but by the claims and the equivalents thereof. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Industrial Applicability
As can be seen from the foregoing, according to the present invention, an OLED driver IC for sensing minute electric charges is added to a driving circuit which drives organic light emitting diodes (OLED), so that a touch sensing function can be provided to an OLED display panel, even without a high-priced touch sensor film having the touch sensing function and a touch-screen signal processing unit for processing signals, thereby reducing the manufacturing cost for the OLED display panel providing the touch sensing function, and providing the touch sensing function without any limitation on the design of the OLED display panel.
Claims
1. A method for providing a touch sensing function to a pixel of organic light emitting diodes (OLED) , the method comprising the steps of: (a) causing the OLED pixel to emit light by generating a driving power corresponding to a relevant value of received information about a pixel to be displayed, and charging a comparison voltage capacitor and a reference voltage capacitor by means of the driving power; (b) checking if a touch has been sensed from by the OLED pixel by comparing the comparison voltage capacitor with the reference voltage capacitor; and
(C) outputting a sense signal corresponding to a logic value for the touch when it is determined in step (b) that the touch has been sensed by the OLED pixel.
2. The method as claimed in claim 1, wherein step (b) comprises the steps of:
(bl) connecting the comparison voltage capacitor and the reference voltage capacitor to a comparison detecting module; and
(b2) checking, by the comparison detecting module, if a touch has been sensed by the OLED pixel.
3. The method as claimed in claim 1, wherein the comparison voltage capacitor is connected in parallel to an input node of the OLED pixel.
4. The method as claimed in claim 1, wherein the reference voltage capacitor is connected in parallel to the OLED equivalent circuit, and has a capacitance equal to that of the comparison voltage capacitor.
5. The method as claimed in claim 1, wherein, in step (b), the comparison detecting module senses a voltage change in the comparison voltage capacitor.
6. The method as claimed in claim 1, wherein the sense signal includes a voltage or digital signal which corresponds to a logic value for the touch of the OLED pixel.
7. A system for providing a touch sensing function to a pixel of organic light emitting diodes (OLED), the system comprising: an OLED driver for causing the OLED pixel to emit light by generating a driving power to output light corresponding to pixel information about the OLED pixel, which has been input from an external interface; a comparison voltage capacitor connected in parallel to the OLED pixel so as to be charged while the OLED pixel emits light by the driving power of the OLED driver; a reference voltage capacitor having a capacitance equal to that of the comparison voltage capacitor, the reference voltage capacitor being charged while the OLED pixel emits light by the driving power of the OLED driver; an OLED equivalent circuit having a resistance value equal to that of the OLED pixel, the OLED equivalent circuit being connected in parallel to the reference voltage capacitor so that the reference voltage capacitor and the comparison voltage capacitor are charged to an equal capacity; and a comparison detecting module connected to the comparison voltage capacitor and the reference voltage capacitor, the comparison detecting module checking if a touch is sensed by comparing a voltage change according to an electric charge change in the comparison voltage capacitor with a voltage change in the reference voltage capacitor.
8. The system as claimed in claim 7, wherein the reference voltage capacitor comprises a switch for switching the reference voltage capacitor between the OLED driver and the comparison detecting module.
9. The system as claimed in claim 7, wherein the comparison voltage capacitor comprises a switch for switching the comparison voltage capacitor between the OLED driver and the comparison detecting module.
10. The system as claimed in claim 7, wherein the comparison detecting module determines that there is a touch on the OLED pixel when a voltage change in the comparison voltage capacitor is different from that in the reference voltage capacitor, and generates a logic value for the touch as a voltage or digital signal.
11. A method for providing a touch sensing function to a pixel of organic light emitting diodes (OLED) connected to a thin film transistor (TFT) by using application software, the method comprising the steps of:
(a) connecting a touch sensing capacitor to a data node of an OLED pixel (hereinafter, referred to as an "input-area OLED pixel") within an input area set by the application software, and connecting a reference capacitor to a data node of an OLED pixel (hereinafter, referred to as a "non- input-area OLED pixel") within an area other than the input area;
(b) comparatively sensing, by a comparison detecting module, current signals input from the touch sensing capacitor and the reference capacitor; and
(C) generating a sense signal notifying that a touch has been sensed when the current signals input from the touch sensing capacitor and the reference capacitor in step (b) are not equal to each other.
12. The method as claimed in claim 11, wherein the application software provides OLED pixel coordinate information about the input area in order to provide the touch sensing function to the OLED pixel.
13. The method as claimed in claim 11, wherein the touch sensing capacitor and the reference capacitor include pre- reset circuits between the touch sensing capacitor and the data node of the input-area OLED pixel and between the reference capacitor and the data node of the non-input-area OLED pixel, so as to prevent a rapid voltage change when the OLED pixel connected to the TFT proceeds from the sensing step to a reset step in order to perform light emitting of a next frame .
14. The method as claimed in claim 11, wherein, in step (b), when the touch sense OLED pixel is touched by a user, an alternating current signal is generated from the touch sense OLED pixel, and is input to the comparison detecting module through the touch sensing capacitor.
15. The method as claimed in claim 11, wherein the sense signal includes a voltage or digital signal which corresponds to a logic value for the touch of the OLED pixel.
16. A system for providing a touch sensing function to a pixel of organic light emitting diodes (OLED) connected to a thin film transistor (TFT) by using application software, the system comprising: a touch sensing capacitor connected to a data node of an OLED pixel (hereinafter, referred to as an "input-area OLED pixel") within an input area established by the application software; a reference capacitor connected to a data node of an OLED pixel (hereinafter, referred to as a "non-input-area OLED pixel") within an area other than the input area established by the application software; and a comparison detecting module connected to the touch sensing capacitor and the reference capacitor, the comparison detecting module checking if a touch is sensed on the OLED pixel by comparing current signals input from the touch sensing capacitor and the reference capacitor.
17. The system as claimed in claim 16, wherein the input- area OLED pixel transmits an alternating current signal generated by a touch to the comparison detecting module through the touch sensing capacitor.
18. The system as claimed in claim 16, wherein the comparison detecting module compares a change in current input from the touch sensing capacitor with a change in current input from the reference capacitor, and generates a voltage or digital signal corresponding to a logic value notifying that a touch has been sensed when the two changes are different from each other.
19. A method for providing a touch sensing function to an organic light emitting diodes (OLED) display by using application software, the method comprising the steps of:
(a) generating touch sense coordinates corresponding to each piece of graphic frame information, by using the graphic frame information generated by the application software;
(b) transmitting the graphic frame information to an OLED driver, and transmitting the touch sense coordinates to a Switch Mapping Mux Register (SMMR); (c) performing a control operation such that a screen corresponding to the graphic frame information is displayed on an OLED display panel, and performing a control operation such that a switch of each detecting module in a comparison detecting module is connected to the touch sense coordinates ;
(d) checking if there is an input from the touch sense coordinates; and
(e) generating and transmitting touch sense information to an output register when it is determined in step (d) that there is an input from the touch sense coordinates, and generating a sense signal by the output register.
20. The method as claimed in claim 19, wherein the sense signal includes touch sense coordinates corresponding to the touch sense information.
21. The method as claimed in claim 19, after step (e), further comprising the steps of: (f) analyzing, by a main processor receiving the sense signal, the sense signal, and calculating central coordinates of touch sense coordinates corresponding to the touch sense information; (g) generating rearranged touch sense coordinates by rearranging the touch sense coordinates with respect to the central coordinates;
(h) transmitting the rearranged touch sense coordinates to the SMMR; (i) controlling, by the SMMR, the comparison detecting module such that the switch of the detecting module is connected to an OLED pixel corresponding to the rearranged touch sense coordinates; and
(J) generating and transmitting, by the comparison detecting module, rearranged touch sense information to the output register, and generating and transmitting, by the output register, a rearrangement sense signal to the main processor.
22. The method as claimed in claim 19, wherein the application software provides touch sense coordinates which are obtained by arranging, at predetermined intervals, information about OLED pixel coordinates within an input area, in order to provide the touch sensing function to the OLED pixel.
23. A system for providing a touch sensing function to an organic light emitting diodes (OLED) display by using application software, the method comprising the steps of: an OLED display panel configured by two-dimensionally arranging OLED pixels; an OLED driver for generating a driving power which causes the OLED display panel to emit light; a main processor for performing a control operation such that graphic frame information generated by the application software is transmitted to the OLED driver, and generating touch sense coordinate information corresponding to each piece of the graphic frame information; a comparison detecting module connected to touch sense coordinates corresponding to the touch sense coordinate information, the comparison detecting module generating touch sense information when an input is generated to the touch sense coordinates; a Switch Mapping Mux Register (SMMR) for receiving the touch sense coordinate information from the main processor and controlling the comparison detecting module, so as to switch each detecting module to be connected to the touch sense coordinates; and an output register for receiving the touch sense information from the comparison detecting module, and generating and transmitting a sense signal corresponding to the touch sense information to the main processor.
24. The system as claimed in claim 23, wherein the main processor calculating central coordinates of touch sense coordinates corresponding to the touch sense information by analyzing the sense signal received from the output register, generates rearranged touch sense coordinates by rearranging the touch sense coordinates with respect to the central coordinates, and transmits the rearranged touch sense coordinates to the SMMR.
25. The system as claimed in claim 23, wherein the system simultaneously performs transmitting the graphic frame information to the OLED driver and transmitting the touch sense coordinate information to the SMMR.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060060936A KR100743545B1 (en) | 2006-06-30 | 2006-06-30 | Method and system for providing touch sensing function to organic light emitting diode |
| KR10-2006-0060936 | 2006-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008002043A1 true WO2008002043A1 (en) | 2008-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2007/003066 WO2008002043A1 (en) | 2006-06-30 | 2007-06-25 | Method and system for providing touch sensing function to organic light emitting diode |
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| Country | Link |
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| KR (1) | KR100743545B1 (en) |
| WO (1) | WO2008002043A1 (en) |
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