CN101963716A - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
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- CN101963716A CN101963716A CN2010102780669A CN201010278066A CN101963716A CN 101963716 A CN101963716 A CN 101963716A CN 2010102780669 A CN2010102780669 A CN 2010102780669A CN 201010278066 A CN201010278066 A CN 201010278066A CN 101963716 A CN101963716 A CN 101963716A
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Abstract
The invention provides a liquid crystal display. The liquid crystal display comprises a liquid crystal module, a backlight module, a driving and detecting module and a plurality of light sensors, wherein the liquid crystal module consists of a polarizer, a glass substrate, liquid crystal, a color filter, a thin film transistor, a black matrix, a plurality of conductive wires and the like; the backlight module comprises a light source, a light guide plate, a diffuser sheet and the like; the driving and detecting module comprises a data driver, a gate driver, a light sensor driver, a light sensing detector and the like; the plurality of light sensors consist of P-N diodes or thin film transistors; one light sensor is arranged on each pixel unit respectively; and the plurality of light sensors are used for sensing red and infrared radiation which is transmitted by the light source, passes through the liquid crystal module and is then reflected back by touch fingers of a light touch liquid crystal user, so that a sense signal is output for judging a finger touch position.
Description
Technical field
The present invention refers to a kind of smooth touch-control liquid crystal display especially about a kind of LCD.
Background technology
Information, the energy and biology are human present three kinds of very important science and technology.Two most important foundation stones of Information of Science and Technology are exactly display and semiconductor integrated circuit.Display is the window that message is transmitted between people, the machine, and it has become the indispensable important device of modern.The application of display is very extensive, by undersized mobile phone, and digital still camera, and video camera, the notes type of middle size and desktop computer all need display to large-sized domestic TV and projector equipment etc.The kind of display is a lot, and main have cathode ray tube (CRT) display, a LCD (LCD), electric slurry display panel (PDP), light emitting diode (LED) display panel, Field Emission Display (FED), vacuum fluorescent display panel (VFD), and electroluminescence display panel (ELP) etc.Wherein, LCD is the most extensively used, and occupies leader's position.
LCD continues toward light weight always, and is slim, reaches high performance direction and develops, and the requirement of carrying for convenience and using has the exploitation and the manufacturing of touch-control liquid crystal display panel then.The core technology of touch-control liquid crystal display panel mainly is how to detect the position of touch of user on panel.For now, the mode of detection has optical touch, ultrasonic touch-control, resistance touch-control, reaches capacitance touching control etc.These traditional technology all need to increase other element, have caused increasing volume, weight, the manufacturing cost of display panel, even have reduced some performances of display panel, for example have influence on the aperture opening ratio of brightness etc.
Traditional optical touch control type LCD is provided with a large amount of infrared light sources and corresponding Photosensing Units all around above panel, detect by this and judge the position of touch of user on panel.This kind design has not only increased the volume and the weight of panel, has also increased the complexity and the manufacturing cost of processing procedure.The disclosed smooth touch liquid crystal display of the present invention is integrally formed at Photosensing Units on the Liquid Crystal Module with the manufacture method of semiconductor integrated circuit, and utilize infrared ray that back light launches as the sensing light source, thereby can not increase the volume and the weight of panel, also can not increase the complexity and the manufacturing cost of processing procedure, and can improve the performance of light sensing contact panel.
Summary of the invention
The object of the present invention is to provide a kind of LCD, it mainly is disposed at a plurality of OPTICAL SENSORS respectively on each pixel cell, be used for sensing from light source, and pass Liquid Crystal Module, point the infrared radiation that reflects through light touch liquid crystal user's touch-control again, according to and export a sensing signal, for the judgement of finger touch position.
A kind of LCD provided by the present invention comprises a Liquid Crystal Module, a backlight module, a driving and detection module and a plurality of OPTICAL SENSORS.Wherein the foregoing liquid crystal module includes a upper substrate, an infrabasal plate, a plurality of pixel cell and a plurality of membrane transistor; Aforementioned backlight module includes a visible light source and an infrared light sources; Each OPTICAL SENSORS is disposed at a pixel cell in aforementioned a plurality of OPTICAL SENSORS, and be arranged on the above-mentioned substrate, in order to sensing from the infrared light sources light source, pass Liquid Crystal Module, again through the infrared ray wave band radiation of user's touch-control reflection, according to and export a sensing signal, to judge position of touch.
Compared with prior art, LCD of the present invention, mainly a plurality of OPTICAL SENSORS are disposed at respectively on each pixel cell, be used for sensing from light source, and pass Liquid Crystal Module, the infrared radiation that reflects through light touch liquid crystal user's touch-control finger again, according to and export a sensing signal, for the judgement of finger touch position.
Description of drawings
Figure 1A is the tangent plane synoptic diagram of the structure of LCD one embodiment of the present invention;
Figure 1B is the equivalent circuit diagram of Figure 1A structure;
Fig. 1 C is the synoptic diagram of portion of element in the structure of Figure 1A;
Fig. 2 A is the tangent plane synoptic diagram of another example structure of LCD of the present invention;
Fig. 2 B is the equivalent circuit diagram of Fig. 2 A structure;
Fig. 2 C is the synoptic diagram of portion of element in the structure of Fig. 2 A;
Fig. 3 is the tangent plane synoptic diagram of another example structure of LCD of the present invention;
Fig. 4 A is that polysilicon and amorphous silicon are to various wavelength (the absorbance curves figure of 300～1100nm) radiation;
Fig. 4 B is that human skin is to various wavelength (the reflectance curve figure of 300～1100nm) radiation;
Fig. 4 C is various wavelength (the pass through penetrance curve maps of three kinds of horizontal polaroids of 300～1100nm) radiation;
Fig. 5 A-5B is that (300～1100nm) radiation passes amorphous silicon to various wavelength, laterally polarizer, the total efficiency curve figure that reflects through human skin again;
Fig. 6 be various wavelength (300～1100nm) radiation backlight type membrane transistor LCD (TFT-LCD) open and closing state under transmitted intensity.
Description of reference numerals: 110-Liquid Crystal Module; The last polaroid of 111-; The 112-top glass substrate; The 113-liquid crystal; The 114-lower glass substrate; Polaroid under the 115-; The 116-colored filter; The 117-OPTICAL SENSORS; The 118-membrane transistor; The 119-black matrix"; The 120-backlight module; The 121-light guide plate; The 122-diffusion sheet; 130-drives and detection module; The 131-data line; The 132-gate line; The 133-sense wire; The 217-OPTICAL SENSORS; The 317-OPTICAL SENSORS.
Embodiment
Figure 1A to Fig. 1 C be LCD of the present invention the tangent plane synoptic diagram.One embodiment of the invention structure comprises Liquid Crystal Module 110, backlight module 120, and drive and detection module 130.Liquid Crystal Module 110 comprises polaroid 111, top glass substrate 112, liquid crystal 113, lower glass substrate 114, following polaroid 115, colored filter 116, OPTICAL SENSORS 117, black matrix" 119, membrane transistor 118 and multiple conductive wires 131,132,133 etc.
Figure 1B is the synoptic diagram of the equivalent electrical circuit of Figure 1A, and it includes three membrane transistors 118, OPTICAL SENSORS 117, data line 131, gate line 132 and a sense wire 133 etc.Wherein, OPTICAL SENSORS 117 is arranged at the corner, lower-left (seeing from top to bottom) of pixel cell.
1C figure is the synoptic diagram of portion of element in the structure of 1A figure, is used for relative position between display light sensor 117 and the black matrix" 119.
Fig. 2 A, Fig. 2 B and Fig. 2 C are the tangent planes of another embodiment of the present invention structure, equivalent electrical circuit, and the synoptic diagram of portion of element etc.Except OPTICAL SENSORS 217 has different being provided with the position, remaining all is same as shown in Figure 1A, Figure 1B and Fig. 1 C.In this structure of the present invention, OPTICAL SENSORS 217 is arranged at the upper left corner (seeing from top to bottom) of pixel cell, shown in Fig. 2 B and Fig. 2 C.
Fig. 3 is the present invention's tangent plane synoptic diagram of another structure again.Except OPTICAL SENSORS 317 has different being provided with the position, remaining all is same as foregoing structure.In this structure of the present invention, OPTICAL SENSORS 317 is arranged on upper glass base material 312 inside surfaces, and it can be positioned at corner, lower-left or upper left corner (the seeing from top to bottom) of pixel region.
Gordian technique of the present invention is to utilize ultrared backlight module emission infrared radiation, after passing Liquid Crystal Module (polaroid), point the reflected back infrared radiation through user's touch-control again, by the OPTICAL SENSORS detecting that is disposed on each pixel cell, wherein the material of OPTICAL SENSORS generally is silicon or amorphous silicon at last.Therefore, for reaching above-mentioned purpose, must understand earlier silicon and amorphous silicon absorption line, human body skin to the reflection of light spectral line, and polaroid penetrate efficient.Fig. 4 A is that silicon and amorphous silicon are to the various wavelength (absorption line of 300～1100nm) radiation.No matter can be found out by this absorption line, be silicon or amorphous silicon, and wavelength is longer, absorbs fewer.For the radiation about 800nm, silicon and amorphous silicon all have the absorptivity about 40%.For the radiation less than 800nm, the absorption of amorphous silicon is greater than silicon.When the wavelength of radiation greater than 800nm, the absorptivity of amorphous silicon drops to zero soon.In other words, amorphous silicon can allow and pass through fully greater than the radiation of 800nm (less than 1100nm).And polysilicon also has only the absorptivity below 40% for the radiation greater than 800nm (less than 1100nm).
Fig. 4 B shows that human skin is to various wavelength (the reflection situation of 300～1100nm) radiation.Curve by figure can find out, the radiation of human skin about for 700nm has maximum reflectivity (surpassing 90%).Have about 65% reflectivity for the radiation about 800nm, have about 40% reflectivity for the radiation about 900nm.And for also have an appointment 15% reflectivity of the radiation about 1000nm.
Fig. 4 C is the spectral line that penetrates of three kinds of horizontal polaroids (650,700, and 800nm).Can find out by curve among the figure, 650nm, 700nm, the horizontal polaroid that reaches 800nm can only stop respectively less than 650nm, 700nm, and the radiation of 800nm, greater than 650nm, 700nm, and the radiation of 800nm then has the penetrance about 85% respectively.In other words, horizontal polaroid can stop short wavelength's radiation effectively; But, only can stop about 15% for long wavelength's radiation.
In conjunction with the absorption line of silicon and amorphous silicon, human body skin to the reflection of light spectral line, and polaroid penetrate efficient, will help to understand the infrared radiation wavelength band that the present invention is suitable for.The gross effect that Fig. 5 A-Fig. 5 B displayed map 4A, Fig. 4 B and Fig. 4 C effect shown in respectively lumps together.By the curve of Fig. 5 A as can be seen, and various wavelength (300～1100nm) radiation passes the polaroid device, again through skin reflex, and the total efficiency that absorbs by amorphous silicon again.With the polarizer sheet of 650nm, its responding range is between 650～820nm, and maximal efficiency (about 30%) betides radiation place of 750nm.For the polaroid of 700nm, responding range is between 700～820nm, and maximal efficiency (about 8%) betides radiation place of 800nm.As for the polaroid of 800nm, the efficient of the radiometric response of various wavelength is zero.By the curve of 5B figure as can be seen, and various wavelength (300～1100nm) radiation passes polaroid, through skin reflex, and the total efficiency that absorbs by silicon again.With the polaroid of 650nm, its responding range is between 650～1100nm, and maximal efficiency (about 25%), betides radiation place of 750nm.For the polaroid of 700nm, its responding range is between 700～1100nm, and maximal efficiency (about 12%) betides 850nm.As for the polaroid of 800nm, the radiation of 800～1100nm still has non-vanishing efficient, and maximal efficiency (about 7%) betides radiation place of 900nm.
Fig. 6 show various wavelength (300～1100nm) radiation backlight type membrane transistor LCD (TFT-LCD) open and closing state under transmitted intensity.The back light of this TFT-LCD is cold cathode fluorescent lamp (CCFL).Curve below among the figure is the transmitted intensity of TFT-LCD various wavelength when closing.As can be seen, visible light wave range (about 400～700nm) is stopped to fall by polaroid fully.But infrared ray partly (about 800～900nm) is penetrable.Curve above among the figure is TFT-LCD when opening, the transmitted intensity of various wavelength.As can be seen, visible light (bluish-green red BGR) and infrared ray (about 800～900nm) are all penetrable.Relatively these two breakthrough curves can demonstrate, and the infrared ray of back light is (about 800～900nm) partly.Though TFT-LCD close or open mode under, all penetrable TFT-LCD.This effect is used to make the light touch-control liquid crystal display by the present invention.
Please consult figure such as Figure 1A and Fig. 3 again, as user during with finger touch LCD of the present invention, the OPTICAL SENSORS below the finger can receive the radiation that entered by the finger skin reflection (650～1100nm) and response to some extent.Simultaneously, other OPTICAL SENSORS in the display then can not receive the radiation that is entered by the finger skin reflection and respond to some extent.The response of these OPTICAL SENSORS of electric circuit inspection is read in utilization, can judge the position of finger institute touch-control by this, and then carries out the touch-control of display.
Light source in the backlight module of light touch liquid crystal display of the present invention can be cold cathode fluorescent lamp (CCFL), and the radiation of CCFL comprises visible light and infrared ray.Visible light partly can be used to the demonstration as display, and infrared ray partly then can be used to the touch-control as finger, and this is two to get at one stroke.
Light source in the backlight module of light touch liquid crystal display of the present invention also can be white light emitting diode (LED) and infrared light-emitting diode (LED).The radiation of white light LEDs can be used to the demonstration as display, and the radiation of infrared LEDs then can be used to the touch-control as finger.
OPTICAL SENSORS in the light touch liquid crystal display of the present invention can use P-N diode or TFT to constitute.When using the P-N diode as OPTICAL SENSORS, this P-N diode need add earlier and gives reverse bias.When the P-N of reverse bias diode is subjected to ultrared irradiation that finger skin reflection enters, can produce backward current.Read these backward currents, can judge the position of finger institute touch-control.When using TFT, TFT is used as the forward bias voltage drop diode-type as OPTICAL SENSORS.
To sum up, the disclosed LCD of the present invention includes Liquid Crystal Module, backlight module, reaches driving and detection module etc.The present invention mainly is arranged at a plurality of OPTICAL SENSORS the inside surface of liquid crystal cell lower glass substrate, or the inside surface of liquid crystal cell top glass substrate, and (position of finger touch is judged in 650～1100nm) radiation through the reflection of finger skin to utilize the long wavelength can highly penetrate the back light of liquid crystal cell.Because OPTICAL SENSORS is embedded in liquid crystal cell inside, and do not need to set up back light infrared light sources in addition.So can reduce the volume and the weight of LCD, also can reduce the manufacturing cost of LCD.
Though the disclosed LCD of the present invention is described in detail with several embodiment, these embodiment are used for limiting the present invention.For the professional person of association area of the present invention,, give various modifications when adding to embodiment recited above under spirit of the present invention and scope.Therefore, scope of patent protection of the present invention when with the appended claim in back the person of being defined be as the criterion.
Claims (10)
1. a LCD is characterized in that, comprises:
One Liquid Crystal Module includes a upper substrate, an infrabasal plate, a plurality of pixel cell and a plurality of membrane transistor;
One backlight module includes a visible light source and an infrared light sources;
One drives and detection module; And
A plurality of OPTICAL SENSORS, wherein each OPTICAL SENSORS is disposed at a pixel cell, and be arranged on described upper substrate or the described infrabasal plate, in order to sensing from the infrared light sources light source, pass described Liquid Crystal Module, again through the infrared ray wave band radiation of user's touch-control reflection, according to and export a sensing signal, to judge position of touch.
2. LCD as claimed in claim 1 is characterized in that, described a plurality of OPTICAL SENSORS are arranged on the inside surface of infrabasal plate of described Liquid Crystal Module.
3. LCD as claimed in claim 1 is characterized in that, described a plurality of OPTICAL SENSORS are arranged on the inside surface of upper substrate of described Liquid Crystal Module.
4. as claim 2 or 3 described LCD, it is characterized in that each described membrane transistor is arranged at a corner of each described pixel cell, and each described OPTICAL SENSORS is arranged in all the other three corners of this pixel cell any one.
5. LCD as claimed in claim 1 is characterized in that, visible light in the described backlight module and infrared light sources all are cold-cathode fluorescence lamp.
6. LCD as claimed in claim 1 is characterized in that the visible light source in the described backlight module is a white light-emitting diode, and described infrared light sources is an infrared light-emitting diode.
7. LCD as claimed in claim 1 is characterized in that, the wavelength of the infrared ray wave band that this infrared light sources is launched is contained 650～1100nm.
8. LCD as claimed in claim 1 is characterized in that, but each OPTICAL SENSORS is made of the diode of detected light wavelength between 650～1100nm wave band.
9. LCD as claimed in claim 1 is characterized in that each OPTICAL SENSORS is made of membrane transistor.
10. LCD as claimed in claim 9 is characterized in that, this membrane transistor that is used for light sensing operates in and adds gate pole and the source electrode of forward bias voltage drop in membrane transistor.
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| CN 201010278066 CN101963716B (en) | 2010-09-10 | 2010-09-10 | Liquid crystal display |
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| CN 201010278066 CN101963716B (en) | 2010-09-10 | 2010-09-10 | Liquid crystal display |
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| CN101963716B CN101963716B (en) | 2013-09-25 |
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| CN102520826A (en) * | 2011-08-18 | 2012-06-27 | 友达光电股份有限公司 | Display and method for judging position of indicator of three-dimensional interactive stereoscopic display |
| CN103308966A (en) * | 2012-03-12 | 2013-09-18 | 群康科技(深圳)有限公司 | Optical member and display system |
| CN103529998A (en) * | 2013-10-31 | 2014-01-22 | 四川虹欧显示器件有限公司 | Method for determining multi-touch point positions of display screen |
| CN104238832A (en) * | 2014-08-26 | 2014-12-24 | 合肥鑫晟光电科技有限公司 | Light touch panel, light touch display screen and light touch display device |
| CN104412209A (en) * | 2012-09-07 | 2015-03-11 | 松下知识产权经营株式会社 | Display device and display control system |
| CN104518771A (en) * | 2015-01-09 | 2015-04-15 | 广东海信家电有限公司 | Infrared touch switch assembly and range hood with same |
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| CN106773163A (en) * | 2016-12-20 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of liquid crystal display panel and liquid crystal display |
| CN108334246A (en) * | 2017-12-11 | 2018-07-27 | 北京硬壳科技有限公司 | Suspension touch control method and relevant apparatus |
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| CN110750169A (en) * | 2019-09-20 | 2020-02-04 | 苏州佳世达电通有限公司 | Touch control display device |
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| CN112925444A (en) * | 2021-03-04 | 2021-06-08 | 业成科技（成都）有限公司 | Touch control display |
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| US9052779B2 (en) | 2011-08-18 | 2015-06-09 | Au Optronics Corp. | Display and method of determining a position of an object applied to a three-dimensional interactive display |
| CN102520826B (en) * | 2011-08-18 | 2014-08-27 | 友达光电股份有限公司 | Display and method for judging position of indicator of three-dimensional interactive stereoscopic display |
| TWI454996B (en) * | 2011-08-18 | 2014-10-01 | Au Optronics Corp | Display and method of determining a position of an object applied to a three-dimensional interactive display |
| CN102520826A (en) * | 2011-08-18 | 2012-06-27 | 友达光电股份有限公司 | Display and method for judging position of indicator of three-dimensional interactive stereoscopic display |
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| CN101963716B (en) | 2013-09-25 |
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