CN100495129C - Touch control type display light signal detection method and display device - Google Patents
Touch control type display light signal detection method and display device Download PDFInfo
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- CN100495129C CN100495129C CNB2007101671840A CN200710167184A CN100495129C CN 100495129 C CN100495129 C CN 100495129C CN B2007101671840 A CNB2007101671840 A CN B2007101671840A CN 200710167184 A CN200710167184 A CN 200710167184A CN 100495129 C CN100495129 C CN 100495129C
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Abstract
This invention discloses a kind of test method, which uses optical signal to test touch-control indicator. It uses optical sensor to tests the first optical signal at the first time. Then it inserts a black menu at the second time, and uses this optical sensor to test the second optical signal. Finally it compares these tow optical signals and outputs the third one to decide the contact point's position on the skin plate. So it can test the touching position more accurately by using the display of inserting black menu and the test mode.
Description
Technical field
The invention relates to a kind of light signal detection method of touch-sensitive display, particularly a kind of light signal detection method that inserts black picture with the touch position of detection touch-sensitive display.
Background technology
The employed technology of Touch Screen can be divided into three kinds at present, is respectively resistance-type screen, condenser type screen and fluctuation formula screen.With finger or do not have writing brush flicking screen and can produce voltage and come operation resistance formula screen.The condenser type screen utilizes finger to decide the touch points position for conductor to draw small electric current.The screen surface of fluctuation formula screen is covered with ultrasonic or infrared ray, and finger blocks standing wave pattern and completing place are detected.
General interactive display can be made touch panel by plug-in resistance or capacitive detection module, but also can make touch panel by making photosensor array on thin film transistor (TFT) (TFT) array base palte.
Please refer to Fig. 1, is a kind of touch panel in the LCD 10, wherein is provided with a plurality of optical sensor 11A, 11B, 11C, in order to the sensor light signal.LCD 10 also is provided with back light 12.When the user touches touch panel, because finger blocking surround lighting 13B, so optical sensor 11B can't detect surround lighting 13B, the person of detecting of its institute serve as reasons that finger reflects backlight 14.On the contrary, optical sensor 11A, 11C sense surround lighting 13A, 13C.Therefore when surround lighting was very dark, the signal that optical sensor sensed will be shown in Fig. 2 A, and when surround lighting was very bright, the signal that optical sensor sensed will be shown in Fig. 2 B.
Framework and detection mode as shown in Figure 1, optical sensor is subjected to the influence of surround lighting easily, makes the signal difficult judgment of contact point.
Summary of the invention
The present invention discloses a kind of light signal detection method of touch-sensitive display, its be the very first time with light sensors first light signal; Then insert a black picture in second time, and with this light sensors second light signal; Then compare first light signal and second light signal again and export the 3rd light signal, with the position of decision contact point on touch panel.
The present invention also discloses a kind of display device, and it includes touch panel, and in order to display image signals, wherein display device also includes control device and signal transducer.Control device in very first time display image signals in touch panel, and in the second time showing black picture light signal in touch panel.Signal transducer can detect first light signal respectively at the very first time, and in second time detecting, second light signal.
The present invention utilizes the demonstration of inserting black picture and detection mode to detect touch position more accurately.
The explanation of content of the present invention and the explanation of embodiment are in order to demonstration and explanation spirit of the present invention and principle, and provide patent claim of the present invention further to explain.
Below in embodiment, be described in detail detailed features of the present invention and advantage, its content is enough to make any those skilled in the art to understand technology contents of the present invention and implements according to this, and according to the disclosed content of this instructions, claim and graphic, any those skilled in the art are when understanding objects and advantages of the present invention.
Description of drawings
Fig. 1 is the synoptic diagram of the disclosed touch panel of prior art.
Fig. 2 A and Fig. 2 B are the light signal sensing result of the disclosed touch panel of prior art.
Fig. 3 is the process flow diagram of the light signal detection method of the disclosed touch-sensitive display of the present invention.
Fig. 4 A to Fig. 4 C is the sensing result of the light signal detection method of the disclosed touch-sensitive display of the present invention.
Fig. 5 A to Fig. 5 C is the sensing result of the light signal detection method of the disclosed touch-sensitive display of the present invention.
Fig. 6 is the synoptic diagram of the disclosed touch panel of the present invention.
Fig. 7 is applied to the synoptic diagram of liquid crystal indicator for the present invention.
Pixel synoptic diagram when Fig. 8 is applied to liquid crystal indicator for the present invention.
[main element label declaration]
10 LCD 11A optical sensors
11B optical sensor 11C optical sensor
12 back light 13A surround lightings
13B surround lighting 13C surround lighting
14 15A surround lightings backlight
15B surround lighting 16 is backlight
200 can touch district's 201 fingers
202 bright spots, 203 bright spots
310 control device, 320 signal transducers
330 impact dampers, 340 data processors
341 comparers, 350 touch panels
360 back lights, 370 pixel electrodes
410 array base paltes, 420 colored filter substrates
430 liquid crystal layers, 440 backlight modules
450 polarizing layers, 460 polarizing layers
470A optical signal sensor 470B optical signal sensor
510 scanner drivers, 520 data drivers
530 sensing signal drivers, 540 liquid crystal cells
550 optical signal sensor G1 sweep traces
G2 sweep trace D1 data line
D2 data line S1 sensing signal line
The S2 sensing signal line
Embodiment
Fig. 3 is the process flow diagram of the light signal detection method of the disclosed touch-sensitive display of the present invention, with the position of the contact point that detects touch panel, its be the very first time with light sensors first light signal (step 100); Then insert a black picture in second time, and with this light sensors second light signal (step 102); Then compare first light signal and second light signal again and export the 3rd light signal, with the position (step 102) of decision contact point on touch panel.Relatively the step of first light signal and second light signal system carries out subtraction with this first light signal and this second light signal.The zone that touch panel detects peaked the 3rd light signal is a contact point.
In the embodiment of the touch-sensitive display with back light, optical sensor detects light and the ambient light that contact point reflection back light provides in the very first time, and first light signal then includes light and the ambient light that the reflection back light provides.At the second time detecting ambient light, second light signal then comprises ambient light.
In another embodiment, when the user touches screen, the operating frequency of touch-sensitive display can be increased, for example frequency multiplication; For instance, if original operating frequency is 45Hz, then the operating frequency of touch-sensitive display increases to 90Hz under the touching pattern.When the operating frequency of display is too high, user's eyes will be experienced the scintillation on the screen, and therefore, if will carry out the detection of light signal under the pattern of frequency multiplication, the primitive operation frequency of display can not be too high.Be noted that the operating frequency of 45Hz is only as exemplary illustration.
In having the touch-sensitive display of back light, can utilize the method for closing back light to insert black picture.Have among the embodiment of touch-sensitive display of a plurality of pixel electrodes at another, but transmitting and displaying black picture light signal to a plurality of pixel electrodes insert black picture.
Fig. 4 A to Fig. 4 C is the embodiment that illustrates application drawing 3 disclosed methods, and it is to detect under the brighter situation of surround lighting.The touched district of touch screen 200 can represent by two-dimensional coordinate, but a plurality of check points of dividing regions on it.As user during with the finger touches screen, first light signal of light sensors can be represented by the light signal of a plurality of check points.In this embodiment, optical sensor is to detect having under the situation backlight, therefore user's finger 201 presents the shade state under the state of surround lighting, the screen position of being touched presents bright spot 202 because of factor backlight, therefore, as user during with the finger touches screen, that is during the very first time, the state of user during with the finger touches screen comes record by light sensors to first light signal.
Second time after the very first time is inserted a black picture, this moment optical sensor with sensing less than any light signal, therefore, even if the user is still touching screen, but the bright spot 202 that touch position produced will disappear, and the state of this moment comes record by second light signal of light sensors.
Then, compare first light signal and second light signal again, for example utilize subtraction, the value of first light signal and the value of second light signal are subtracted each other with the position of decision contact point on touch panel.By among the figure as can be known, except bright spot 202, the detected light signal of optical sensor much at one, therefore can produce the 3rd light signal with after two signal subtractions, and stay the expression touch position bright spot 202, can be equal in fact behind the signal subtraction of all the other positions, the zone of this peaked the 3rd light signal is a contact point.Thus, can eliminate the influence of surround lighting, left signal is the position of real touch points, in order to do the accuracy of judging contact point with increase.
Fig. 5 A to Fig. 5 C is another embodiment that illustrates application drawing 3 disclosed methods, and it is to detect under the darker situation of surround lighting.Under darker situation, screen will present dark; Therefore, when the user touches screen, will only can detect the bright spot 203 of expression touch position in the very first time.After inserting black picture in second time, this moment optical sensor with sensing less than any light signal.Then, first light signal and second light signal are carried out subtraction, by among the figure as can be known, except bright spot 203, the detected light signal of optical sensor much at one, therefore with after two signal subtractions, then can stay the bright spot 203 of expression touch position, can be equal in fact behind the signal subtraction of all the other positions.
Below cooperate Fig. 6 that the embodiment of display device of the method for application drawing 3 is described.Be noted that embodiment shown in Figure 6 is not the actual applicable device of method in order to restriction Fig. 3 only as exemplary illustration.
As shown in the figure, display device includes touch panel 350 in order to display image signals.Display device includes control device 310 and signal transducer 320 again.Control device 310 can be arranged in the liquid crystal indicator with signal transducer 320, perhaps in the organic light emitting diode display.
In an embodiment of the touch-sensitive display with back light 360, it is backlight to the touch panel in the display device 350 that back light 360 provides, and control device 310 electrically connects back light 360.At this embodiment, optical sensor detects light and the ambient light that contact point reflection back light 360 provides in the very first time, and first light signal then includes light and the ambient light that reflection back light 360 provides.Control device 310 cuts out back light 360 in second time, and optical signal sensor 320 is in the second time detecting ambient light, and second light signal then comprises ambient light.
In another embodiment, display device also comprises impact damper 330, electrically connects signal transducer 320, in order to first light signal and second light signal of 320 sensings of received signal sensor, and temporary this first light signal and this second light signal.
Display device can comprise that data processor 340 electrically connects impact damper 330, perhaps be electrically connected to signal transducer 320 to connecing, in order to receive first light signal and second light signal, to handle first light signal and second light signal, with the position of decision contact point on touch control screen.Data processor 340 can comprise comparer 341 in order to compare first light signal and second light signal, to export the 3rd light signal.
In another embodiment, display device also includes back light 360, and wherein control device 310 electric connection back lights 360, and control device 310 are closed back light 360 in second time, to insert a black picture.
In another embodiment, display device includes a plurality of pixel electrodes 370, and wherein control device 310 electrically connects this pixel electrode 370, and in the second time transmitting and displaying black picture signal to these a plurality of pixel electrodes 370.
According to above disclosed embodiment, utilize and insert the influence that a black picture comes ambient light, can improve the precision of contact point location.
Fig. 7 is applied to the synoptic diagram of liquid crystal indicator for the present invention, and the embodiment shown in this figure is not the actual applicable device of method in order to restriction Fig. 3 only as exemplary illustration.Liquid crystal indicator shown in the figure comprises array base palte 410, colored filter substrate 420, is arranged at liquid crystal layer 430, backlight module 440 and polarizing layer 450,460 between array base palte 410 and the colored filter substrate 420.Can comprise thin film transistor (TFT) (not shown), public electrode (not shown) and pixel electrode (not shown) on the array base palte 410, colored filter substrate 420 comprises black matrix" (not shown) and color filter layers (not shown).Backlight module 440 makes normally display image of liquid crystal indicator in order to sufficient brightness and the light source that is evenly distributed to be provided.Polarizing layer 460 is positioned at the top layer of colored filter substrate 420, in order to natural light is transformed into the polarization light (polarized light) with polarization characteristic.450 of polarizing layers are disposed between array base palte 410 and the backlight module 440.The employed optical signal sensor 470A of embodiment, 470B are arranged on the array base palte, and detailed configuration please refer to Fig. 8.
Sweep trace G1 to G2 and data line D1 to D2 are formed on the array base palte 410, and sweep trace and the data line definition pixel region that intersects each other, and only indicate sweep trace G1 to G2 and data line D1 to D2 among the figure, and in fact sweep trace and data line all have many.All have liquid crystal cells 540 and optical signal sensor 550 in each pixel region.Each liquid crystal cells 540 in the pixel region connects sweep trace and data line, and 550 of optical signal sensors are connected to sweep trace G1 to G2 and sensing signal line S1 to S2.
Sweep trace G1 to G2 is by scanner driver 510 controls, and scanner driver 510 provides scanning impulse to G1 to G2 successively.Data line D1 to D2 is by data driver 520 controls, and data driver 520 is to data pulse is provided.Scanning impulse is a cut-in voltage, is used for opening liquid crystal cells 540 thin film transistor (TFT) (not shown), and data pulse is the liquid crystal material driving voltage, is used to change the orientation of liquid crystal molecule.Sensing signal line S1 to S2 is by 530 controls of sensing signal driver.
The embodiment that cooperates Fig. 6, when the user touches touch panel, control device 310 in very first time display image signals in touch panel, this moment is when the user touches touch panel, because finger blocking surround lighting 15A, therefore optical signal sensor 470A can't detect surround lighting 15A, the person of detecting of its institute serve as reasons that finger reflects backlight 16.Optical signal sensor 470B senses surround lighting 15B.Optical sensor 470A, 470B detect light and the ambient light that contact point reflection back light provides in the very first time, and first light signal then includes light and the ambient light that the reflection back light provides.Then, control device 310 in the second time showing black picture light signal in touch panel. Optical signal sensor 470A, 470B are in the second time detecting ambient light, and second light signal then comprises ambient light.
Though the present invention discloses as above with previous embodiment, so it is not in order to limit the present invention.Without departing from the spirit and scope of the present invention, change of doing and retouching all belong to claim scope of the present invention.
Claims (16)
1. the light signal detection method of a touch-sensitive display, this touch-sensitive display comprises optical sensor, and in order to detect the contacting points position of touch panel, this method comprises the following steps:
The very first time with this light sensors first light signal;
Insert a black picture in second time, and with this light sensors second light signal; And
Relatively this first light signal and this second light signal are to determine the position of this contact point on this touch panel.
2. method according to claim 1, wherein the operating frequency of this touch-sensitive display is at least 45Hz.
3. method according to claim 1, wherein relatively the step of this first light signal and this second light signal is to carry out subtraction at this first light signal and this second light signal.
4. method according to claim 1, wherein this touch-sensitive display also includes back light, the light that this back light of this light sensors provides.
5. method according to claim 4, wherein this contact point of this light sensors reflects the light that this back light provides.
6. method according to claim 1, wherein this light sensors ambient light.
7. method according to claim 6, wherein this optical sensor is in this second time detecting ambient light.
8. method according to claim 1, wherein relatively this first light signal and this second light signal are to export the 3rd light signal, and the zone that this touch panel detects peaked the 3rd light signal is this contact point.
9. method according to claim 1, wherein this touch-sensitive display also includes back light, and wherein the step of the black picture of this insertion comprises and closes this back light.
10. method according to claim 1, wherein this touch-sensitive display also includes a plurality of pixel electrodes, and wherein the step of the black picture of this insertion comprises transmitting and displaying black picture light signal to these a plurality of pixel electrodes.
11. a display device comprises:
Touch panel;
Control device, this control device shows this picture signal in this touch panel in the very first time, and in the second time showing black picture light signal in this touch panel;
Signal transducer, this signal transducer detects first light signal respectively at this very first time, and in this second time detecting, second light signal; And
Data processor electrically connects this signal transducer, in order to receive this first light signal and this second light signal, in order to handle this first light signal and this second light signal, to determine the position of this contact point on this touch control screen.
12. display device according to claim 11 also comprises impact damper, electrically connects this signal transducer, in order to receive this first light signal and this second light signal, in order to temporary this first light signal and this second light signal.
13. display device according to claim 11, wherein this data processor comprises comparer, in order to compare first light signal and second light signal.
14. display device according to claim 11, wherein the operating frequency of this control device is at least 45Hz.
15. display device according to claim 11 also includes back light, wherein control device electrically connects this back light, and closes this back light in second time.
16. display device according to claim 11 also includes a plurality of pixel electrodes, wherein this control device electrically connects this pixel electrode, and in the second time transmitting and displaying black picture signal to these a plurality of pixel electrodes.
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| CNB2007101671840A CN100495129C (en) | 2007-11-02 | 2007-11-02 | Touch control type display light signal detection method and display device |
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| CNB2007101671840A CN100495129C (en) | 2007-11-02 | 2007-11-02 | Touch control type display light signal detection method and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9575584B2 (en) | 2012-12-26 | 2017-02-21 | Lg Display Co., Ltd. | Display device with integrated touch screen and method of driving the same |
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| CN101739182B (en) * | 2008-11-11 | 2014-05-28 | 群创光电股份有限公司 | Built-in touch display panel, built-in touch display device and touch control method |
| JP4699536B2 (en) * | 2009-03-06 | 2011-06-15 | シャープ株式会社 | POSITION DETECTION DEVICE, CONTROL METHOD, CONTROL PROGRAM, AND RECORDING MEDIUM |
| CN101587254B (en) * | 2009-05-19 | 2011-09-14 | 香港应用科技研究院有限公司 | Touch induction liquid crystal display |
| CN102063222A (en) * | 2009-11-17 | 2011-05-18 | 北京汇冠新技术股份有限公司 | Interactive display |
| KR101981685B1 (en) * | 2012-10-04 | 2019-08-28 | 삼성전자주식회사 | Display apparatus, user terminal apparatus, external apparatus, display method, data receiving method and data transmitting method |
| CN103759824B (en) * | 2014-01-23 | 2016-01-20 | 西安电子科技大学 | For the photoelectric switching circuit of visible light sensor |
| TWI698856B (en) * | 2018-11-27 | 2020-07-11 | 友達光電股份有限公司 | Display device and display method |
| CN109830179B (en) * | 2019-03-29 | 2021-01-08 | 维沃移动通信有限公司 | Terminal equipment and photosensitive detection method for terminal equipment |
| CN112035014B (en) * | 2020-08-31 | 2024-01-12 | 京东方科技集团股份有限公司 | Backboard of display module and backboard control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9575584B2 (en) | 2012-12-26 | 2017-02-21 | Lg Display Co., Ltd. | Display device with integrated touch screen and method of driving the same |
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