CN101320298B - Optical locator used for input device and its driving method - Google Patents
Optical locator used for input device and its driving method Download PDFInfo
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- CN101320298B CN101320298B CN2007101099476A CN200710109947A CN101320298B CN 101320298 B CN101320298 B CN 101320298B CN 2007101099476 A CN2007101099476 A CN 2007101099476A CN 200710109947 A CN200710109947 A CN 200710109947A CN 101320298 B CN101320298 B CN 101320298B
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- seeking device
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Abstract
An optical locator used in an input device comprises a signal receiving interface and a luminous element. The signal receiving interface is used for receiving the system signal from the input device. The luminous element can produce flickering light source. The flickering cycle of the flickering light source keeps pace with the cycle of a reference clock of the system signal. The ration of the flickering cycle of the flickering light source and the reference clock reference of the system signal is a whole number.
Description
Technical field
The present invention relates to a kind of light-seeking device and driving method thereof that is used for input media, relate in particular to a kind of light-seeking device of the display panel that is used to have touch controllable function and drive the method that this light-seeking device produces flasher.
Technical background
Display panels has been widely used as the display device in the various electronic products in recent years, for example: mobile phone, personal digital assistant, notebook computer and panel computer.Display panels comprises array base palte and driving circuit, and with the infall of pixel arrangement between multi-strip scanning line on the substrate and many signal line, and driving circuit is used to drive this sweep trace and this signal wire.
On the other hand, under the product demand of stressing human oriented design drove, input type or touch control display device satisfied the optimal selection of this condition beyond doubt.Especially will import with output and be integrated in same display interface (screen), especially other traditional input medias part can't be obtained.Traditional can sensing finger or the display device of the input instruction of pointer, be on display screen, to increase extra sensing element or sensing film, therefore can make cost increase and influence optical property.Recently there is proposition the sensing array of amorphous silicon film transistor (a-Si TFT) to be incorporated into the technology of amorphous silicon film transistor LCD (Liquid Crystal Display) array substrate, embed the sensing element with sensitometric characteristic in specific pixel, therefore this display panels is called embedded type touch control panel (in-cell touch panel) again.
At present sensing element roughly is divided into two kinds of electric charge formula and current types.Fig. 1 is the circuit diagram of electric charge formula sensing element.Electric charge formula sensing element 10 comprises and reads thin film transistor (TFT) (readoutTFT) 11, photoinduction thin film transistor (TFT) (photo TFT) 12 and keep electric capacity 13 that photoinduction thin film transistor (TFT) 12 can make the electric charge on the maintenance electric capacity 13 be released because sensing suitable light.When showing next frame, the gate signal on the sweep trace 15 can be opened again and be read thin film transistor (TFT) 11, and keeps electric capacity 13 can be charged into electric charge again, can detect the quantity of electric charge that charges into via read line 14 simultaneously.In addition, V among Fig. 1
BiasRepresent bias voltage.
As shown in Figure 2, current type sensing element 20 there is no the maintenance electric capacity of store charge, behind photoinduction thin film transistor (TFT) 22 light sensings, the thin film transistor (TFT) 21 that reads that is scanned that gate signal on the line 25 opens has electric current and passes through, and detects size of current via read line 24 simultaneously.No matter electric charge formula or current type all are to utilize amorphous silicon film transistor to be subjected to cause the increase of channel carrier behind the light, thereby make the electric current that passes through rise, and are to utilize the variation of photocurrent size to be used as sensed signal basically.
Difference according to operator scheme can be divided into the embedded type touch control panel area shading (shadow) again and add two kinds of light (excess light).Preceding a kind of light intensity and surround lighting that is directly covered by finger made comparisons, thereby reaches the function that touches the location.Yet this operator scheme can be too low because of ambient light intensity, and cause and the light intensity of shaded areas between correlative value descend, and make contact panel the identification user really to locate part.But and the operator scheme that the latter adds light head it off just, it utilizes the use of arranging in pairs or groups of secondary light source or light pen, all can normally use in any environment guaranteeing.
For moving the contact panel that uses, adding under the light operator scheme, be reasonable selection with light Pen Association.Yet the power consumption problem of light pen really can influence and move the continuous capability that uses, and the light pen that therefore how to design more power saving just becomes an important problem.
Summary of the invention
Fundamental purpose of the present invention provides a kind of light-seeking device of input media, the liquid crystal indicator with input function and driving method thereof of being used for, it makes the light-seeking device produce the Frequency Synchronization of light in the system signal of input media, therefore can make the light-seeking device in the time of the effective light sensing of input media, just produce light, therefore just can reduce the power consumption of light-seeking device.
For reaching above-mentioned purpose, the present invention discloses a kind of light-seeking device that is used for input media, comprising: the signal receiving interface is used to receive the system signal of described input media; And light-emitting component, be used to produce flasher, wherein, the fundamental clock cycle of the flicker cycle of described flasher and described system signal is multiple each other, the frequency of the pulse of the photo-signal that the sensing element of the Frequency Synchronization of described flasher in described input media produces.
The present invention also discloses a kind of liquid crystal indicator with input function, comprising: display panels and steady arm.Described steady arm comprises: the signal receiving interface is used to receive the system signal of described display panels; And light-emitting component, be used to produce flasher, wherein, the fundamental clock cycle of the flicker cycle of described flasher and described system signal is multiple each other, the frequency of the pulse of the photo-signal that the sensing element of the Frequency Synchronization of described flasher in described liquid crystal indicator produces.
The present invention also discloses a kind of method that drives the light-seeking device, may further comprise the steps: the system signal that receives input media; Produce the drive signal in the fundamental clock cycle that is synchronized with this system signal according to described system signal, to drive the light source of described light-seeking device; And according to described drive signal generation flasher, and the fundamental clock cycle of the flicker cycle of described flasher and described system signal is multiple each other, the frequency of the pulse of the photo-signal that the sensing element of the Frequency Synchronization of described flasher in described input media produces.
Description of drawings
Fig. 1 is the circuit diagram of electric charge formula sensing element;
Fig. 2 is the circuit diagram of current type sensing element;
Fig. 3 is the synoptic diagram that the present invention uses light-seeking device input device;
Fig. 4 (a) is the sequential chart of wireless optical steady arm drive signal of the present invention and photo-signal;
Fig. 4 (b) produces the oscillogram of photo-signal when being the sensing element irradiation with irradiation not; And
Fig. 5 is the circuit block diagram of light-seeking device of the present invention and input media.
Embodiment
Fig. 3 is the synoptic diagram that the present invention uses light-seeking device input device.User 80 can hold light-seeking device 32, and goes up click commands or writing words at input media 31 (for example contact panel), just can finish input service via the flasher 321 that light-seeking device 32 produces.The flicker cycle of this flasher 321 is synchronized with the fundamental clock cycle (clock cycle) of the system signal of this input media 31, and the fundamental clock cycle of the system signal of the flicker cycle of this flasher 321 and input media 31 is multiple each other, this fundamental clock cycle via signal wire 33 from input media 31 transmit clock signals, vertical synchronization start signal (verticalsynchronization start signal; STV) or door pulse signal (gate pulse signal; CPV) to the signal receiving interface of light-seeking device 32 and obtain, and adjust being adapted to the flicker cycle of flasher the control signal that wherein vertical synchronization start signal STV and door pulse signal CPV system produced according to fundamental clock cycle (or frequency) of system signal according to the signal that is received.
The resolution of sensing element can be lower than actual pixels resolution in the input media 31, and for example: per 4 * 4 pixels are just placed a sensing element.If pixel resolution is under 1024 * 768 the condition, the resolution of configuration sensing element then is 256 * 192, so photo-signal cycle of producing of sensing element is four times of the gateable clock signal CPV cycle.And photoresponse is that effect is just arranged when pulse produces in photo-signal, so the time irradiation light beyond the pulse of photo-signal is a waste electric power, promptly 3/4ths time is arranged approximately is output without any photo-signal to read line.So the present invention is exactly the light that extinguishes light-seeking device 32 in the time that sensing element can't light sensing, reduce the power consumption of power supply thus, can prolong about four times service time.Generally can utilize the light-emitting component of light emitting diode, utilize the light emitting diode reaction time to be about the advantage of several microseconds (μ m) as light-seeking device 32.
Fig. 4 (a) is the sequential chart of light-seeking device drive signal of the present invention and photo-signal.Fig. 4 (a) shows the pulse 41 of the photo-signal that is produced when gate pulse is opened, and makes light-seeking device 32 moments generation light with pulse in the drive signal 42, and sensing element just can be accepted light simultaneously, to strengthen photo-signal 41.In addition, each frame has vertical synchronization start signal STV when beginning pulse 44 produces, and can carry out vertical scanning again with time frame.The pulse 43 that drives the door pulse signal CPV of each pixel column horizontal scanning from the frame top also produces the gate pulse Vg1～Vgn of each pixel column of scanning in regular turn according to pulse 44 beginnings.The width of per four gate pulses will produce the pulse 42 that drives light-seeking device 32, thereby makes the frequency of flasher of light-seeking device 32 and the Frequency Synchronization of pulse 41.Fig. 4 (b) is sensing element at irradiation and does not produce the oscillogram of photo-signal during irradiation.As the sensing element of effect during just by light-seeking device 32 irradiations, the pulse 41 on the photo-signal can become the bigger pulse of current value 41 '.
Except with signal wire 33 transmission vertical synchronization start signal STV or door pulse signal CPV, move the convenience of using in order to increase, can carry out the transmission of these signals via wireless transmission.Fig. 5 is a light-seeking device of the present invention via the circuit block diagram of the signal transmission interface of the signal receiving interface of wireless communication transmissions mode and input media.The signal receiving interface of light-seeking device comprises antenna 625 and receiver 621, and the signal transmission interface of input media comprises antenna 615 and transmitter 614.System signal generation circuit 612 generation control signals and drive signal make viewing area 611 produce frames in the input media 61, and in addition vertical synchronization start signal STV or door pulse signal CPV are sent to scrambler 613.Encoded again device 613 is modulated to the signal of wireless communication format, and transmitter 614 can transmit to light-seeking device 62 with electromagnetic wave via antenna 615.
Light-seeking device 62 can receive vertical synchronization start signal STV that input medias 61 send or the wireless signal of door pulse signal CPV via antenna 625, and the signal decoding after demoder 622 can be handled receiver 621 be the signal format that driving circuit 623 needs.And driving circuit 623 can the generation drive signal have the fixedly light of flicker frequency with driven light-emitting element 624 generations.Because the response time of light emitting diode approximately is microsecond (μ m) level, thus can adopt light emitting diode as light-emitting component 624, and can mate the width of gate pulse, for example: the gatewidth of 15 cun XGA display panels is about 20 microseconds.In addition, though the light-emitting component of the foregoing description with light emitting diode as examples of implementation, the present invention is limited to this, in another embodiment, also can adopt any response time can mate the light-emitting component of the frequency of gate pulse.As for input media 61 is example with the LCD in this embodiment, yet is not limited to LCD, further comprises other display device or other input media.
Technology contents of the present invention and technical characterstic are open as above, yet those skilled in the art still may reach openly and do all replacement and modifications that does not deviate from spirit of the present invention based on enlightenment of the present invention.Therefore, protection scope of the present invention should be not limited to the disclosed content of embodiment, and should comprise various do not deviate from replacement of the present invention and modifications, and is covered by following claim.
Claims (12)
1. light-seeking device that is used for input media comprises:
The signal receiving interface is used to receive the system signal of described input media; And
Light-emitting component is used to produce flasher,
Wherein, the fundamental clock cycle of the flicker cycle of described flasher and described system signal is multiple each other, the frequency of the pulse of the photo-signal that the sensing element of the Frequency Synchronization of described flasher in described input media produces.
2. light-seeking device as claimed in claim 1, wherein said system signal are clock signal, vertical synchronization start signal or door pulse signal.
3. light-seeking device as claimed in claim 1, the flicker cycle of wherein said flasher are synchronized with the fundamental clock cycle of described system signal.
4. light-seeking device as claimed in claim 1, wherein said light-emitting component is a light emitting diode.
5. light-seeking device as claimed in claim 1, wherein said input media are the embedded type touch control panels.
6. light-seeking device as claimed in claim 1, wherein said light-seeking device is a light pen.
7. liquid crystal indicator with input function comprises:
Display panels;
Steady arm, described steady arm comprises:
The signal receiving interface is used to receive the system signal of described display panels; And
Light-emitting component is used to produce flasher;
Wherein, the fundamental clock cycle of the flicker cycle of described flasher and described system signal is multiple each other, the frequency of the pulse of the photo-signal that the sensing element of the Frequency Synchronization of described flasher in described liquid crystal indicator produces.
8. liquid crystal indicator as claimed in claim 7, the flicker cycle of wherein said flasher are synchronized with the fundamental clock cycle of described system signal.
9. want 7 described liquid crystal indicators as right, wherein said light-emitting component is a light emitting diode.
10. liquid crystal indicator as claimed in claim 7, wherein said steady arm is a light pen.
11. a method that drives the light-seeking device may further comprise the steps:
Receive the system signal of input media;
Produce the drive signal in the fundamental clock cycle that is synchronized with this system signal according to described system signal, to drive the light source of described light-seeking device; And
Produce flasher according to described drive signal, and the fundamental clock cycle of the flicker cycle of described flasher and described system signal is multiple each other, the frequency of the pulse of the photo-signal that the sensing element of the Frequency Synchronization of described flasher in described input media produces.
12. method as claimed in claim 11, wherein said light-seeking device is a light pen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101099476A CN101320298B (en) | 2007-06-06 | 2007-06-06 | Optical locator used for input device and its driving method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101099476A CN101320298B (en) | 2007-06-06 | 2007-06-06 | Optical locator used for input device and its driving method |
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| CN101320298A CN101320298A (en) | 2008-12-10 |
| CN101320298B true CN101320298B (en) | 2011-09-14 |
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| CN2007101099476A Active CN101320298B (en) | 2007-06-06 | 2007-06-06 | Optical locator used for input device and its driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108806580A (en) | 2018-06-19 | 2018-11-13 | 京东方科技集团股份有限公司 | Gate driver control circuit and its method, display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4377810A (en) * | 1980-12-04 | 1983-03-22 | Data General Corporation | Light pen detection circuit and method |
| US5386543A (en) * | 1992-09-07 | 1995-01-31 | U.S. Philips Corporation | Matrix display device with light sensing function and time-shared amplifier |
| CN1525389A (en) * | 2003-02-27 | 2004-09-01 | 宜 王 | Photoelectric input pen |
| CN1768321A (en) * | 2003-03-28 | 2006-05-03 | 三星电子株式会社 | Light pen |
-
2007
- 2007-06-06 CN CN2007101099476A patent/CN101320298B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4377810A (en) * | 1980-12-04 | 1983-03-22 | Data General Corporation | Light pen detection circuit and method |
| US5386543A (en) * | 1992-09-07 | 1995-01-31 | U.S. Philips Corporation | Matrix display device with light sensing function and time-shared amplifier |
| CN1525389A (en) * | 2003-02-27 | 2004-09-01 | 宜 王 | Photoelectric input pen |
| CN1768321A (en) * | 2003-03-28 | 2006-05-03 | 三星电子株式会社 | Light pen |
Non-Patent Citations (3)
| Title |
|---|
| JP昭56-132634A 1981.10.17 * |
| JP昭59-58539A 1984.04.04 * |
| JP昭63-126025A 1988.05.30 * |
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