CN1722215A - Display device and driving method thereof - Google Patents

Display device and driving method thereof Download PDF

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Publication number
CN1722215A
CN1722215A CNA2005100913985A CN200510091398A CN1722215A CN 1722215 A CN1722215 A CN 1722215A CN A2005100913985 A CNA2005100913985 A CN A2005100913985A CN 200510091398 A CN200510091398 A CN 200510091398A CN 1722215 A CN1722215 A CN 1722215A
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signal
sensing
value
sensing signal
state
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CNA2005100913985A
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CN100433121C (en
Inventor
朴钟雄
李柱亨
金炯杰
鱼基汉
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Samsung Display Co Ltd
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Samsung Electronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • 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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors

Abstract

A kind of display device comprises: panel assembly; Back light unit provides light to panel assembly; First photoelectric sensor; Second photoelectric sensor; Sensing signal processor; And signal controller.First photoelectric sensor is provided surround lighting and from the light of back light unit, to produce first sensing signal.Second photoelectric sensor is blocked surround lighting and receives light from back light unit, to produce second sensing signal.Sensing signal processor receives first and second sensing signals from first and second photoelectric sensors, so that handle.The signal controller basis is determined sense conditions from first and second sensing signals of the processing of sensing signal processor, and carries out expectant control operation according to this sense conditions.

Description

Display device and driving method thereof
Technical field
The present invention relates to a kind of display device and driving method thereof.
Background technology
Typical liquid crystal indicator (LCD) comprises lower panel and top panel, and between plate located in the above and the lower panel, liquid crystal (LC) layer with dielectric anisotropy.Lower panel and top panel are provided with pixel electrode and public electrode.Pixel electrode is arranged in matrix, and each pixel electrode is connected to for example thin film transistor (TFT) (TFT) of on-off element Q.Every capable pixel electrode is sequentially supplied with data voltage.Public electrode is covered with the whole surface of top panel, and is supplied to common electric voltage.Pixel electrode, public electrode and LC layer between the two form the LC capacitor, and the LC capacitor is an elementary cell of forming each pixel with on-off element Q.
Thereby the intensity control that the LCD device is applied to the electric field on the LC layer by adjusting is passed the optical transmission rate of lower panel and top panel and is shown desired images.For fear of the deterioration that causes the LC layer owing to the electric field that applies a direction to the LC layer,, the polarity of data voltage is reversed with respect to common electric voltage for every frame, each pixel column or each pixel.
Recently, developed the product that photoelectric sensor is provided to this class LCD device.For example, when the screen of staff or felt pen contact LCD device, photoelectric sensor provides response according to the position of staff or felt pen to the variation of light.The LCD device determines whether touch information for example exists touch, and the position that touches, so that be transferred to external device (ED).External device (ED) is the images signal in response to this touch information.Photoelectric sensor is formed by the independent touch pad in the LCD device.Yet so independent touch pad has increased the thickness and the weight of LCD device, and makes the LCD device be difficult to show detailed character or picture.
Therefore, developed the technology that in the pixel of display image, forms photoelectric sensor.Yet this class photoelectric sensor can cause the many mistakes in response to the photoelectricity sensing that touches, and this is because the output characteristics of photoelectric sensor can change according to surrounding environment, outside light intensity for example, brightness backlight, temperature etc.Thereby although touch has taken place, the LCD device may not recognize any touch, although perhaps do not touch, LED matrix may have been awared touch.
Summary of the invention
The purpose of this invention is to provide a kind of display device and driving method thereof, it can produce the stable output signal of photoelectric sensor, so that determine touch information exactly in response to user's touch, and irrelevant with the variation of external environment condition.
A kind of display device is provided, and it comprises: panel assembly; The back light unit of light is provided to described panel assembly; First photoelectric sensor; Second photoelectric sensor; Sensing signal processor; And signal controller.First photoelectric sensor is provided surround lighting and from the light of described back light unit, to produce first sensing signal.Second photoelectric sensor is blocked described surround lighting and receives light from described back light unit, to produce second sensing signal.Sensing signal processor receives described first and second sensing signals from described first and second photoelectric sensors, so that handle.The signal controller basis is determined sense conditions from first and second sensing signals of the processing of described sensing signal processor, and carries out expectant control operation according to this sense conditions.
A kind of driving method that is provided with the display device of back light unit is provided, and wherein back light unit is used to provide light, and described method comprises: at the first photoelectric sensor place reception environment light with from the light of described back light unit, to produce first sensing signal; Block described surround lighting and reception light at the second photoelectric sensor place, to produce second sensing signal from described back light unit; Judge signal in response to the described first and second sensing signal generation states; And, determine sense conditions in response to the described environment light intensity of judging the signal indication by described state.Described state is judged the difference between described first and second sensing signals of signal indication.
A kind of display device is provided, and it comprises: panel assembly; The back light unit of light is provided to described panel assembly; First photoelectric sensor; Second photoelectric sensor; The 3rd photoelectric sensor; Sensing signal processor; And signal controller.The first photoelectric sensor reception environment light and from the light of described back light unit, to produce first sensing signal.Second photoelectric sensor is blocked described surround lighting and receives light from described back light unit, to produce second sensing signal.The 3rd photoelectric sensor receives described surround lighting and from the light of described back light unit, produces the 3rd sensing signal to touch according to the user.Sensing signal processor is handled described first to the 3rd sensing signal from described first to the 3rd photoelectric sensor.Signal controller is adjusted (regulate) described the 3rd sensing signal according to first and second sensing signals of handling.
A kind of driving method that is provided with the display device of back light unit is provided, and wherein back light unit is used to provide light, and described method comprises: at the first photoelectric sensor place reception environment light with from the light of described back light unit, to produce first sensing signal; Block described surround lighting and reception light at the second photoelectric sensor place, to produce second sensing signal from described back light unit; Receive described surround lighting at the 3rd photoelectric sensor place and from the light of described back light unit, to produce the 3rd sensing signal according to touching; And adjust described the 3rd sensing signal in response to described first and second sensing signals.
Description of drawings
Explain exemplary embodiment of the present invention by the reference accompanying drawing, the present invention will become apparent, in the accompanying drawings:
Fig. 1 is the block diagram according to the LCD device of exemplary embodiment of the present;
Fig. 2 is the equivalent circuit diagram according to the sub-pixel of the LCD device of exemplary embodiment of the present;
Fig. 3 is the exemplary layout according to the LCD device of exemplary embodiment of the present;
Figure 4 and 5 are respectively the sectional views that line IV-IV ' and the V-V ' in Fig. 3 got;
Fig. 6 A and 6B each naturally according to the synoptic diagram of the reference light electric transducer of the LCD device of exemplary embodiment of the present;
Fig. 7 is the synoptic diagram that the photoelectric sensor according to exemplary embodiment of the present is installed in the position on the LC panel assembly of LCD device;
Fig. 8 is according to the signal reader of the LCD device of exemplary embodiment of the present and the block diagram of signal controller;
Fig. 9 explanation is at the sensing signal of the reference light electric transducer shown in Fig. 6 A and the 6B;
Figure 10 is an exemplary process diagram according to the sense conditions that is used for definite LCD device of exemplary embodiment of the present;
Figure 11 is another exemplary process diagram according to the sense conditions that is used for definite LCD device of exemplary embodiment of the present;
The waveform that depends on the sensing signal of the photoelectric sensor in the viewing area of sensing modes in Figure 12 explanation the LCD device according to another exemplary embodiment of the present invention; And
Figure 13 is the exemplary process diagram of sensing signal that is used to control the photoelectric sensor in the viewing area of LCD device that is used for according to exemplary embodiment of the present.
Embodiment
Now, the present invention is described more all sidedly with reference to the accompanying drawings, illustrated in the accompanying drawings is exemplary embodiment of the present invention.Yet the present invention can implement with many different forms, therefore should not be construed as limited to the embodiment that sets forth herein.
In the accompanying drawings, for the sake of clarity, the thickness in each floor He Ge district all is exaggerated.In whole accompanying drawing, identical label is represented components identical.Should be appreciated that when for example element of floor, film, district, substrate or panel was known as " being positioned on another element ", this element can be located immediately on another element, perhaps also can exist medium element.In contrast, when element is known as " being located immediately on another element ", then there is not any medium element.
Fig. 1 is the block diagram of liquid crystal display (LCD) device according to exemplary embodiment of the present, and Fig. 2 is the equivalent circuit diagram according to the pixel of the LCD device of exemplary embodiment of the present.
Referring to Fig. 1 and 2, LCD device according to exemplary embodiment of the present comprises liquid crystal (LC) panel assembly 300 and image analyzer 400, data driver 500, sensor scan device (sensorscanner) 700, and the sensing signal processor 800 that is connected to LC panel assembly 300.The LCD device also comprises the back light unit 900 that light is provided to LC panel assembly 300, supplies with the driving voltage generator 950 of the required voltage of said elements, and the signal controller 600 of control said elements.
Panel assembly 300 comprises a plurality of signal wire G 1-G n, D 1-D m, S 1-S n, P 1-P m, P SGAnd P SD, and be connected electrically to signal wire G 1-G n, D 1-D m, S 1-S n, P 1-P m, P SGAnd P SDAnd be arranged in a plurality of pixels of matrix basically.
Signal wire G 1-G n, D 1-D m, S 1-S n, P 1-P m, P SGAnd P SDThe picture line G that comprises the images sweep signal 1-G nData line D with the transmit image data signal 1-D mPicture line G 1-G nBasically follow direction and extend, and be parallel to each other basically, and data line D 1-D mBasically extend along column direction, and be parallel to each other basically and be substantially perpendicular to picture line G 1-G n
Signal wire G 1-G n, D 1-D m, S 1-S n, P 1-P m, P SGAnd P SDThe sensing sweep trace S that also comprises transmission sensing sweep signal 1-S nAnd the sensing signal line P of transmission sensing signal 1-P mSensing sweep trace S 1-S nBasically follow direction and extend, and be parallel to each other basically, and sensing signal line P 1-P mBasically extend along column direction, and be parallel to each other basically.Sensing sweep trace S 1-S nBe arranged essentially parallel to picture line G 1-G nExtend, and sensing signal line P 1-P mBe arranged essentially parallel to data line D 1-D mExtend.
Signal wire G 1-G n, D 1-D m, S 1-S n, P 1-P m, P SGAnd P SDAlso comprise transmission control voltage V SGControl pressure-wire P SGWith transmission input voltage V SDInput voltage line P SDControl pressure-wire P SGBe arranged essentially parallel to picture line G 1-G nWith sensing sweep trace S 1-S nExtend, and input voltage line P SDBe arranged essentially parallel to data line D 1-D mWith sensing signal line P 1-P mExtend.
Each pixel comprises and is connected electrically to picture line G 1-G nWith data line D 1-D mOn the first on-off element Q S1And be connected electrically to the first on-off element Q S1On LC capacitor C LCWith holding capacitor C ST
The first on-off element Q S1For example thin film transistor (TFT) (TFT) has three terminals: be connected electrically to picture line G 1-G nOne of them (for example, G i) on control end; Be connected electrically to data line D 1-D mOne of them (for example, D j) on input end; And be connected electrically to LC capacitor C LCWith holding capacitor C STOn output terminal.
In addition, each pixel comprises photoelectric sensor, and this sensor comprises being connected electrically to controls pressure-wire P SGWith input voltage line P SDOn sensing element Q P, be connected electrically to sensing sweep trace S 1-S nWith sensing signal line P 1-P mOn second switch element Q S2, and be electrically connected at control pressure-wire P SGWith second switch element Q S2With sensing element Q PBetween node between sensor signal capacitor C PPerhaps, be not that all pixels all comprise photoelectric sensor, for example, one of them pixel can comprise photoelectric sensor, perhaps, can comprise photoelectric sensor with extremely about spaced each pixel of 2mm of about 1mm.In other words, in case of necessity, the density of photoelectric sensor can be controlled, thereby, corresponding sensing sweep trace S 1-S nWith sensing signal line P 1-P mNumber also can control.
Sensing element Q PHave three terminals: be connected electrically to control pressure-wire P respectively SGWith input voltage line P SDOn control end and input end, and be connected electrically to sensor signal capacitor C PWith second switch element Q S2On output terminal.Sensing element Q PProduce photocurrent, it is in response to the sensing element Q that is made of amorphous silicon or polysilicon PThe rayed of raceway groove (channel).This photocurrent flow direction sensor signal capacitor C PWith second switch element Q S2, it is by being applied to input voltage line P SDInput voltage V SDDrive.
Sensor signal capacitor C PBe electrically connected at sensing element Q PWith control pressure-wire P SGBetween, and memory response is in from sensing element Q PThe electric charge of photocurrent, to keep predetermined voltage.If unnecessary, can omit sensor signal capacitor C P
Second switch element Q S2Have three terminals: be connected electrically to sensing sweep trace S respectively 1-S nOne of them (for example, S i) last, sensing signal line P 1-P mOne of them (for example, P j) go up and sensing element Q POn control end, output terminal and input end.As sensing sweep trace S 1-S nReceive and be used for conducting second switch element Q S2Voltage the time, second switch element Q S2Will be by sensor signal capacitor C PStored voltage or from sensing element Q PPhotocurrent as sensing signal V P1-V PMOutput to sensing signal line P 1-P m
In above-mentioned exemplary embodiment, the first on-off element Q S1With second switch element Q S2And sensing element Q PCan comprise amorphous silicon or multi-crystal TFT.
Driving voltage generator 950 produces the required a plurality of voltages of LCD device, for example, is respectively applied for conducting/shutoff first on-off element Q S1With second switch element Q S2Image scanning forward voltage V OnWith image scanning shutoff voltage V Off, and input voltage V SDWith control voltage V SG
Image analyzer 400 is connected electrically to the picture line G of LC panel assembly 300 1-G nOn, and synthetic image scanning forward voltage V from driving voltage generator 950 OnWith image scanning shutoff voltage V Off, be applied to picture line G with generation 1-G nOn the image scanning signal.
Data driver 500 is connected electrically to the data line D of LC panel assembly 300 1-D mOn, and to data line D 1-D mApply data voltage.
Sensor scan device 700 is connected electrically to the sensing sweep trace S of LC panel assembly 300 1-S nOn, and synthetic image scanning forward voltage V from driving voltage generator 950 OnWith image scanning shutoff voltage V OffAnd generation is applied to sensing sweep trace S 1-S nOn the sensing sweep signal.
Sensing signal processor 800 is connected electrically to the sensing signal line P of LC panel assembly 300 1-P mOn, and receive from sensing signal line P 1-P mThe sensing signal V of output P1-V PM, handle to carry out prearranged signal.
Back light unit 900 is close to LC panel assembly 300 and places, and so that light to be provided to LC panel assembly 300, and comprises a plurality of lamps.
Signal controller 600 control image analyzer 400, data driver 500, sensor scan device 700, sensing signal processor 800, back light unit 900 and driving voltage generators 950.
Image analyzer 400, data driver 500, sensor scan device 700 or sensing signal processor 800 can be directly installed on the LC panel assembly 300 via drive integrated circult, perhaps can be installed on the flexible printed circuit film, to be attached to the LC panel assembly 300 that adopts in carrier band encapsulation (TCP) type assembly.Perhaps, image analyzer 400, data driver 500, sensor scan device 700 or sensing signal processor 800 can be integrated in the LC panel assembly 300.
In addition, image analyzer 400, data driver 500, sensor scan device 700, sensing signal processor 800, and signal controller 600 may be implemented as single-chip.Image analyzer 400, data driver 500, sensor scan device 700, sensing signal processor 800, and signal controller 600 can be integrated in the single-chip, reduces installing space thus and reduces power consumption.Certainly, in case of necessity, each element or the circuit that uses in each element can be installed in outside this single-chip.
To describe the display operation and the photoelectricity sensing (photo sensing) of this LCD device now in detail.
Supply with received image signal R, G and B to signal controller 600, and the input control signal of the demonstration of control LCD device.Input control signal comprises for example vertical synchronizing signal Vsync, horizontal-drive signal Hsync, major clock MCLK, and data enable (enable) signal DE.Provide input control signal from the graphics controller (not shown) of outside.Produce image scanning control signal CONT1 and data controlling signal CONT2 and in response to input control signal to being suitable for operating the received image signal R of LC panel assembly 300, after G and B handle, signal controller 600 provides image scanning control signal CONT1 to image analyzer 400, and provides processed images signal DAT and data controlling signal CONT2 to data driver 500.
Image scanning control signal CONT1 comprises and is used to instruct image analyzer 400 at voltage V OnIn time, begins the vertical synchronization commencing signal STV of image scanning and is used at voltage V OnAt least one clock signal of the output of the imaged scanning of time control.
Data controlling signal CONT2 comprises the horizontal synchronization commencing signal STH that is used for notification data driver 500 beginning horizontal cycles, is used to instruct data driver 500 to data line D 1-D mApply the load signal LOAD of proper data voltage, be used for counter-rotating control voltage RVS with respect to common electric voltage Vcom counter-rotating (reverse) data voltage polarity, and data clock voltage HCLK.
Data driver 500 receives the bag (packet) of the processed images signal DAT that is used for pixel column from signal controller 600, and in response to the data controlling signal CONT2 from signal controller 600, DAT converts analog data voltage to these processed images signals.
In response to the image scanning control signal CONT1 from signal controller 600, image analyzer 400 is to picture line G 1-G nApply image scanning forward voltage V On, conducting is connected electrically to picture line G thus 1-G nOn the first on-off element Q S1
Data voltage and the common electric voltage V that is applied on each pixel ComBetween difference be expressed as LC capacitor C LCCharging voltage, i.e. pixel voltage.The orientation of liquid crystal molecule (orientation) depends on the amplitude (magnitude) of pixel voltage, and it is orientated the polarization (polarization) that the light of pixel is passed in decision.
At the first on-off element Q S1ON time in, data driver 500 is applied to corresponding data line D with data voltage 1-D mOn, this ON time is known as " horizontal cycle " or " 1H ", and it equals the one-period of horizontal-drive signal Hsyc and data enable signal DE.Then, data voltage is via the first on-off element OS of conducting 1Sequentially imposed on corresponding pixel.
By repeating said process, in a frame, all picture line G 1-G nImage scanning forward voltage V all sequentially is provided On, thus data voltage is applied on all pixels.When beginning next frame after finishing a frame, reverse control signal (inversioncontrol signal) RVS that is applied on the data driver 500 is controlled so as to the reversal of poles (this is known as " frame counter-rotating ") that makes data voltage.Reverse control signal RVS also can be controlled so as to the reversal of poles that makes the data voltage that flows in the frame in data line, for example row counter-rotating, and the line counter-rotating perhaps makes the reversal of poles of the data voltage in the bag (packet), for example row counter-rotating, some counter-rotating.
In response to the sensing control signal CONT3 from signal controller 600, sensor scan device 700 is with image scanning forward voltage V OnOrder is applied to sensing sweep trace S 1-S nOn, and sensing signal processor 800 is read and is applied to sensing signal line P 1-P mOn sensing signal V P1-V PMAt sensing signal V to reading P1-V PMAfter amplifying also filtering, the conversion of signals that sensing signal processor 800 will be handled becomes digital signal, so that be transferred to signal controller 600.Signal controller 600 is by suitably handling this digital signal and determine position contacting and whether exist contact (for example, touch location and no touch is arranged), and then, signal controller 600 will be given external device (ED) about the information transmission of contact position.External device (ED) then will be based on the image signal transmission of this information to the LCD device.
Now, referring to the structure of Fig. 3 to 5 detailed description according to the LCD device of exemplary embodiment of the present.
Fig. 3 is the exemplary layout according to the LCD device of exemplary embodiment of the present, and Figure 4 and 5 are respectively the sectional views that line IV-IV ' and V-V ' in Fig. 3 are got.
LCD device according to exemplary embodiment of the present comprises tft array panel 100, common electrode panel 200, and be clipped in LC layer 3 between tft array panel 100 and the common electrode panel 200.
Now, describe tft array panel 100 in detail referring to Fig. 3 to 5.
Picture line 121, storage electrode line 131, sensing sweep trace 127 and control pressure-wire 129 are placed on insulated substrate 110 for example on the clear glass.
Picture line 121, sensing sweep trace 127 and control pressure-wire 129 be basically along the horizontal expansion of LCD device and be separated from each other, and images sweep signal, sensing sweep signal and control signal V respectively SG, and comprise control electrode 124,128 and 126 respectively.Control pressure-wire 129 comprises the dilation (expansion) 123 that extends from control electrode 126.
Each storage electrode line 131 is basically along the horizontal expansion of LCD device, and comprises the jut (protrusion) that forms storage electrode 133.Storage electrode line 131 is supplied to predetermined voltage, and common electric voltage for example, this predetermined voltage are applied to the public electrode 270 on the common electrode panel 200 of LCD device.
Picture line 121, sensing sweep trace 127, storage electrode line 131 and control pressure-wire 129 are for example by containing Al metal such as Al and Al alloy, contain Ag metal such as Ag and Ag alloy, contain Cu metal such as Cu and Cu alloy, contain Mo metal such as Mo and Mo alloy, Cr, Ti or Ta make.Picture line 121, sensing sweep trace 127, storage electrode line 131 and control pressure-wire 129 can have sandwich construction, and this structure comprises the two membranes with different physical properties.One deck in this two membranes comprises containing the Al metal, contain the Ag metal or containing the Cu metal and makes for example by the Low ESR metal, is used to reduce picture line 121, sensing sweep trace 127, signal delay or voltage drop in storage electrode line 131 and the control pressure-wire 129.Another layer in this two membranes for example has the material of good physical, chemistry and electricity contact property to make by having with other material such as tin indium oxide (ITO) or indium zinc oxide (IZO), for example contains the Mo metal, Cr, Ta or Ti.The example of this two membranes combination comprises Cr film and last Al-Nd alloy film down, and following Al film and last Mo film.
In addition, picture line 121, sensing sweep trace 127, the side of storage electrode line 131 and control pressure-wire 129 is with respect to the surface tilt of insulated substrate 110, and its pitch angle is in the scope of about 30 degree between spending with about 80.
For example the insulation course of being made by silicon nitride SiNx 140 is arranged on picture line 121, sensing sweep trace 127, and storage electrode line 131, control pressure-wire 129, control electrode 124,128 and 126, storage electrode, and on the expose portion of insulated substrate 110.
For example semiconductor striped (semiconductor stripe) 151 and the semiconductor island of being made by the amorphous silicon (being abbreviated as " a-Si ") or the polysilicon of hydrogenation (semiconductor island) 156,158,159 is arranged on the selected part of insulation course 140.Each semiconductor striped 151 is basically along the longitudinal extension of LCD device, and tool has jut 154 that comes out towards control electrode 124 branches and the dilation 157 that extends therefrom.Semiconductor striped 151 is at picture line 121, sensing sweep trace 127 broadens near storage electrode line 131 and the control pressure-wire 129, so that semiconductor striped 151 is covered with picture line 121, sensing sweep trace 127, most of zone of storage electrode line 131 and control pressure-wire 129.
For example for example be arranged on the semiconductor striped 151 on the n+ hydrogenation a-Si of phosphorus (phosphorous) the Ohmic contact striped 161 and the Ohmic contact island 162,164,165,166,168 of making by silicide or heavy doping n type impurity.Each Ohmic contact striped 161 has jut 163, and jut 163 and Ohmic contact island 165 are arranged on the jut 154 of semiconductor striped 151 in couples.In addition, Ohmic contact island 162,164 and Ohmic contact island 166,168 are arranged on semiconductor island 156 and 158 respectively in couples.
Semiconductor striped 151, semiconductor island 156,158 and 159, Ohmic contact striped 161, and the side of Ohmic contact island 162,164,165,166 and 168 is with respect to the surface tilt of insulated substrate 110, and its pitch angle for example is in about 30 and spends in the scopes of about 80 degree.
Data line 171, input voltage line 179a and sensing signal line 179b, output electrode 174,175 and input electrode 176 are arranged on Ohmic contact striped 161, Ohmic contact island 162,164,165,166 and 168, and on the insulation course 140.
Data line 171, input voltage line 179a and sensing signal line 179b extend longitudinally basically, and with picture line 121, sensing sweep trace 127, storage electrode line 131 and control pressure-wire 129 intersect, and transmit data voltage respectively, sensing input voltage and sensing signal.
Each output electrode 175 comprises and a storage electrode 133 equitant dilations 177.Each longitudinal component that comprises the data line 171 of jut forms towards the input electrode 173 of the end of output electrode 175.Control electrode 124, input electrode 173, and output electrode 175 forms the TFT with raceway groove (channel) together with the jut 154 of semiconductor striped 151, this raceway groove is arranged on the jut 154 between input electrode 173 and the output electrode 175.Such TFT is for example as the first on-off element Q S1
Each input voltage line 179a comprises longitudinal component and lateral part, and a part that includes the lateral part of jut forms towards the input electrode 172 of the end of output electrode 174.Control electrode 126, input electrode 172 and output electrode 174 form the TFT with raceway groove together with semiconductor island 156, and this raceway groove is arranged on the semiconductor island 156 between input electrode 172 and the output electrode 174.Such TFT is as sensing element Q P
Sensing element Q PThe output electrode 174 and the second sensing element Q S2Input electrode 176 be electrically connected each other.Sensing signal line 179b comprises towards the output electrode 178 of input electrode 176 projections.The every pair of input electrode 176 and output electrode 178 are separated from each other, and are provided with relative to one another with respect to control electrode 128.Control electrode 128, input electrode 176 and output electrode 178 form the TFT with raceway groove together with semiconductor island 158, and this raceway groove is arranged on the semiconductor island 158 between input electrode 176 and the output electrode 178.Such TFT is as second switch element O S2
Each output electrode 174 has the dilation 174a that overlaps mutually of dilation 123 with each control pressure-wire 129, and sensing signal capacitor C PForm with 174a by overlapping dilation 123.
Data line 171, input voltage line 179a, sensing signal line 179b, output electrode 174,175 and 178, and input electrode 172,173 and 176 is for example made by refractory metal such as Cr, Mo, Ti, Ta or its alloy.Yet they also can have the sandwich construction that comprises Low ESR film (not shown) and good contact membranes (not shown).The example of this sandwich construction combination comprises Mo film down, middle Al film and last Mo film, and the combinations thereof of following Cr film and last Al-Nd alloy film and following Al film and last Mo film.
Be similar to picture line 121 and sensing sweep trace 127, storage electrode line 131 and control pressure-wire 129, data line 171, input voltage line 179a, sensing signal line 179b, output electrode 174,175 and 178 and input electrode 172,173 and 176 have tapered side, and its pitch angle be in about 30 spend about 80 the degree scopes in.
Ohmic contact striped 161 and Ohmic contact island 162,164,165,166,168 be sandwiched under semiconductor striped 151 and semiconductor island 156,158,159 and at last data line 171, input voltage line 179a, sensing signal line 179b, output electrode 174,175,178, and between the input electrode 172,173,176, to reduce contact impedance therebetween.Semiconductor striped 151 comprises not by the expose portion of data line 171 and output electrode 175 coverings, for example part between output electrode 173 and output electrode 175.Although semiconductor striped 151 is narrower than data line 171 in most of position, yet the width of semiconductor striped 151 becomes bigger near above-mentioned picture line 121 and sensing sweep trace 127, storage electrode line 131 and control pressure-wire 129, thereby smooth surface profile (profile) is provided, avoids the disconnection of data line 171 thus.
Passivation (passivation) layer 180 is arranged on data line 171, input voltage line 179a, and sensing signal line 179b, output electrode 174,175 and 178, input electrode 172,173 and 176, and on the expose portion of semiconductor striped 151.Organic insulator 187 is arranged on this passivation layer.Passivation layer 180 is for example made by inorganic insulator such as silicon nitride or monox, and organic insulator 187 is for example made by the photosensitive organic material with good planar nature.In this case, the surface of organic insulator 187 has alternately projection and depressed patterns, and this pattern is also included within on the reflecting electrode 194, with the maximization reflection efficiency.
Passivation layer 180 and organic insulator 187 have the contact hole 185 of the dilation 177 that exposes output electrode 175.These contact holes 185 can have polygon or circular shape.It is about 30 to spend the pitch angle of about 85 degree that the side of contact hole 185 has scope for example, perhaps has stepped appearance (step form).
Pixel electrode 190 is arranged on the organic insulator 187.Pixel electrode 190 comprises transparency electrode 192 and reflecting electrode 194.Transparency electrode 192 is for example made by transparent conductor such as ITO or IZO, and reflecting electrode 194 is for example made by opaque reflection conductor such as Ag or Ag alloy or Al or Al alloy.Pixel electrode 190 can also comprise contact adminicle (not shown), and it is for example made by Mo or Mo alloy, Cr, Ti or Ta.This contact adminicle has been guaranteed the contact property of transparency electrode 192 with reflecting electrode 194, and has avoided transparency electrode 192 oxidation reflecting electrodes 194.
Each pixel all has transmission area 195 and echo area RA.Transmission area 195 is the zones of having omitted reflection horizon 194, and echo area RA is the zone that exists reflection horizon 194.Display unit (cell) gap of transmission area 195 and echo area RA is different, and this is owing to organic insulator 187 in transmission area 195 is removed.
The through hole 199 that makes semiconductor island 156 be exposed to surround lighting owing to removing of organic insulator 187 and pixel electrode 190 is arranged on the semiconductor island 156.
Pixel electrode 190 is connected electrically on the dilation 177 of output electrode 175 physically by contact hole 185, so that the data voltage that pixel electrode 190 receives from output electrode 175.The pixel electrode 190 collaborative public electrodes 270 that are supplied to data voltage produce electric field, the orientation of liquid crystal molecule in its decision liquid crystal layer 3.
As mentioned above, pixel electrode 190 and public electrode 270 form LC capacitor C LC, the voltage that applies after the TFT is turn-offed in its storage.In addition, with LC capacitor C LCThe holding capacitor C of electric parallel connection STBe provided and be used for strengthening the store voltages capacity.Holding capacitor C STOverlap mutually with storage electrode line 131 by dilation 177 and to realize output electrode 175.Perhaps, holding capacitor C STCan realize by pixel electrode 190 and adjacent image scanning signal wire 121 are overlapped mutually, omit storage electrode line 131 then.In the exemplary embodiment, pixel electrode 190 and sweep trace 121 and adjacent data line 171 overlap mutually, to improve the aperture ratio.
Next referring to Fig. 3 to 5 explanation common electrode panel 200.
Common electrode panel 200 comprises insulated substrate 210, resistance light member (light blockingmember) 220, color filter 230, external coating (overcoat) 250, and public electrode 270.Resistance light member 220 is known as and is used to the black matrix that prevents that light from leaking, and it is arranged on the insulated substrate 210, and this insulated substrate 210 can be a clear glass for example.Resistance light member 220 can comprise the opening of pixel-oriented electrode 190, and can have the flat shape substantially the same with pixel electrode 190.Perhaps, resistance light member 220 can comprise corresponding to the straight line portion of data line 171 with corresponding to the other parts of TFT.
Color filter 230 is arranged on the insulated substrate 210, and is arranged on basically in the zone that is surrounded by resistance light member 220.Color filter 230 can be basically along the longitudinal extension of pixel electrode 190.Color filter 230 can be represented such as one in the primary colours of red, green and blue look.
Be used to prevent that color filter 230 is exposed and provides the external coating 250 of flat surfaces to be arranged on color filter 230 and resistance light member 220.For example the public electrode of being made by transparent conductive material such as ITO and IZO 270 is arranged on the external coating 250.
The a pair of polarizer (not shown) that is used for polarized light is attached to the tft array of LC panel assembly 300 and the outside surface of common electrode panel 100 and 200.
LCD device according to exemplary embodiment of the present comprises photoelectric sensor, its sense ambient light and/or from the light of back light unit, with the sensing signal (sensingsignal) of photoelectric sensor in the control pixel.Now, describe the first reference light electric transducer PSA and the second reference light electric transducer PSB in detail referring to Fig. 6 A to 8.
Fig. 6 A and 6B are according to first reference light electric transducer PSA of exemplary embodiment of the present and the synoptic diagram of the second reference light electric transducer PSB.Fig. 7 is the synoptic diagram that is positioned at the installation site on the LC panel assembly 300 of LCD device according to the first reference light electric transducer PSA of exemplary embodiment of the present and the second reference light electric transducer PSB.Fig. 8 is according to the signal reader of the LCD device of exemplary embodiment of the present and the block diagram of signal controller.
The first reference light electric transducer PSA is arranged on the photoelectric sensor in the DA of viewing area, and it is connected electrically on the sensing sweep trace (sensing scanning line) and comprises top referring to the described sensing element of Fig. 2 (sensing element) Q P, on-off element Q S2With sensor signal capacitor (sensor signalcapacitor) C P, as shown in Figure 6A.The first reference light electric transducer PSA is provided with along the edge of the viewing area DA of display image in the LC panel assembly 300.The longitudinal length that the first reference light electric transducer PSA also is arranged essentially parallel to LC panel assembly 300 is provided with.Yet in case of necessity, this reference light electric transducer PSA can be arranged on the outside of viewing area DA, and can separate with photoelectric sensor in the DA of viewing area (below be called " PSDA ") and provide.The edge that the first reference light electric transducer is arranged on the viewing area DA of LC panel assembly 300 has reduced influence of the shade that caused by touch etc.
The second reference light electric transducer PSB comprises sensing element Q P, on-off element Q S2With sensor signal capacitor C P, shown in Fig. 6 B.The second reference light electric transducer PSB is arranged on the outside of viewing area DA, as shown in Figure 7, and is connected on the independent sensing sweep trace.The second reference light electric transducer PSB is in close proximity to the edge setting of viewing area, and wherein the first reference light electric transducer PSA is arranged on this edge.The second reference light electric transducer PSB is configured to be arranged essentially parallel to the first reference light electric transducer PSA.
When from the front viewing display area, coboundary or lower limb that this first reference light electric transducer PSA and the second reference light electric transducer PSB can be in close proximity to LC panel assembly 300 are provided with, and under arbitrary situation, the first reference light electric transducer PSA is connected on the selected sensing sweep trace, and the second reference light electric transducer PSB is in close proximity to the outside that the first reference light electric transducer PSA is set at viewing area DA.
The first reference light electric transducer PSA is via sensing element Q POpening reception environment light, and via dorsal part or sensing element Q PNear through hole receive light from back light unit 900 (below be known as " LBU ").In addition, the first reference light electric transducer PSA receives the LBU that is guided (guide) by the layer that forms the first reference light electric transducer PSA, perhaps by this first reference light electric transducer PSA inner or outside layer and this layer LBU that material layer guided on every side.The first reference light electric transducer PSA produces sensing signal in response to the irradiation of surround lighting and LBU.
The second reference light electric transducer PSB represents the layout of the photoelectric sensor that the layout to the first reference light electric transducer PSA substitutes.The second reference light electric transducer PSB stops sensing element Q PBe subjected to the influence of surround lighting, this is because resistance light member 220 and/or reflecting electrode 194 make sensing element Q PIsolated with surround lighting.Yet the second reference light electric transducer PSB is via dorsal part or sensing element Q PNear through hole perhaps receives LBU via the LBU that is directed as mentioned above.In addition, the second reference light electric transducer PSB receives more the be reflected LBU of electrode 194 reflections with respect to the first reference light electric transducer PSA.The second reference light electric transducer PSB produces sensing signal in response to the irradiation of LBU.
LCD device according to exemplary embodiment of the present can comprise a plurality of first reference light electric transducer PSA and the second reference light electric transducer PSB, and, be similar to PSDA, this first reference light electric transducer PSA and the second reference light electric transducer PSB are connected to sensing signal line P 1-P mOn, with in response to the sensing sweep signal with sensing signal V P1-V PMOutput to sensing signal line P 1-P m
Now, referring to Fig. 8 and 9 the LCD device of handling from the sensing signal of the first reference light electric transducer PSA and the second reference light electric transducer PSB is described.
Fig. 8 is according to the signal reader of the LCD device of exemplary embodiment of the present and the block diagram of signal controller, and Fig. 9 illustrates respectively the sensing signal at the first reference light electric transducer PSA shown in Fig. 6 A and the 6B and the second reference light electric transducer PSB.
As shown in Figure 8, this LCD device comprises sensing signal processor 800, signal controller 600, back light unit 900 and driving voltage generator 950.
Sensing signal processor 800 comprises sensing signal adjuster (regulator) 810 and analog to digital converter 820.Sensing signal adjuster 810 is via sensing signal line P 1-P mReception is from each sensing signal V of the first reference light electric transducer PSA and the second reference light electric transducer PSB P1-V PM, so that amplify and/or filtering.Analog to digital converter 820 is with adjusted sensing signal V P1'-V PM' convert digital signal to.
Signal controller 600 comprises the signal input unit 610 of series connection, operating unit 620 and control signal output unit 630, and it can be realized with DLC (digital logic circuit).
The sensing signal DV that signal input unit 610 is handled from the process digital conversion of analog to digital converter 820 P1-DV PMIn other words, signal input unit 610 is asked for the sensing signal DV through the first reference light electric transducer PSA of digital conversion P1-DV PMMean value, to produce the first average sensing signal V SA, and ask for sensing signal DV through the second reference light electric transducer PSB of digital conversion P1-DV PMMean value, to produce the second average sensing signal V SBIn addition, signal input unit 610 can combine digital filtering.As mentioned above, use the first average sensing signal V for a plurality of first reference light electric transducer PSA and the second reference light electric transducer PSB SAWith the second average sensing signal V SBPrevented unevenness with respect to the sensing signal of the sensing signal that produces for the single first reference light electric transducer PSA and the second reference light electric transducer PSB.
Operating unit 620 is in response to the first average sensing signal V from signal input unit 610 SAWith the second average sensing signal V SB, produce first to third state judgement signal V1, V2 and V3.As shown in Figure 9, first state judges that signal V1 is by deduct the first average sensing signal V from peak signal Vmax SADefine, second state judges that signal V2 is by the first average sensing signal V SAWith the second average sensing signal V SBBetween difference define, and the third state judges that signal V3 is by from the second average sensing signal V SBIn deduct minimum value Vmin and define.Peak signal Vmax and minimum signal Vmin are determined by sensing signal adjuster 810 and analog to digital converter 820, and for example, the value of peak signal Vmax and minimum signal Vmin is allowed to be input in the operating unit 620.
First state judges that signal V1 depends on the brightness of environment light intensity and lamp, and first state judges that the value of signal V1 becomes big along with the environment light intensity and diminishes.Second state judges that signal V2 depends on the brightness of environment light intensity and lamp, and second state judges that the value of signal V2 becomes big and becomes big along with the environment light intensity.The third state judges that signal V3 is along with the brightness of lamp becomes big and becomes big.
Operating unit 620 is judged signal V1, V2 and V3 based on first to the third state, determines sense conditions in response to the environment light intensity of LCD device.In other words, by comparing first to third state judgement signal V1, V2 and V3 and predetermined set value, it is outdoor indoor that operating unit 620 can determine that the LCD device is positioned at, though perhaps indoor, it is bright or dark.In case of necessity, sense conditions can be confirmed as in two or more possibility states, and such state judgement example will be described referring to Figure 10 and 11.
Figure 10 is the exemplary process diagram of sense conditions that is used to judge the LCD device according to exemplary embodiment of the present, and Figure 11 is another exemplary process diagram of sense conditions that is used to judge the LCD device according to exemplary embodiment of the present.
In the process flow diagram of Figure 10, operating unit 620 is determined sense conditions SM from two possibility states with 0 and 1 expression.
At first, operating unit 620 is initialized as " 1 " (S10) with sense conditions SM, and subsequently, relatively first state is judged the signal V1 and the first predetermined value Vth1, and relatively second state is judged the signal V2 and the second predetermined value Vth2 (S20).Result as a comparison, judge that in response to first state signal V1 judges that less than the first predetermined value Vth1 and second state signal V2 is greater than the second predetermined value Vth2, operating unit 620 becomes sense conditions SM into " 0 " (S30), otherwise sense conditions SM is remained " 1 ".
When sense conditions SM was " 0 ", operating unit 620 relatively second state was judged signal V2 and the 3rd predetermined value Vth3, and relatively the third state is judged signal V3 and the 4th predetermined value Vth4 (S40).The result judges that in response to second state signal V2 judges that less than the 3rd predetermined value Vth3 and the third state signal V3 less than the 4th predetermined value Vth4, becomes sense conditions SM into " 1 " (S10), otherwise sense conditions SM is remained " 0 " as a comparison.
Under said circumstances, when sense conditions SM was " 1 ", the environment light intensity was little, and perhaps the difference between surround lighting and the LBU is little, and this is for example corresponding to room brilliancy.When sense conditions SM was " 0 ", the environment light intensity was big, and perhaps the difference between surround lighting and the LBU is big, and this is for example corresponding to outdoor brightness.
Operating unit 620 sends to control signal output unit 630 with the judged result of sense conditions SM.Control signal output unit 630 is controlled back light unit 900, driving voltage generator 950 and sensing signal adjuster 810 in response to sense conditions SM.
For example, control signal output unit 630 is transferred to back light unit 900 with backlight control signal BLC, so that the brightness of the lamp of control back light unit 900.Like this, for example,, turn-off back light unit 900 for sense conditions SM " 0 ", and for sense conditions SM " 1 ", conducting back light unit 900.
In addition, control signal output unit 630 is transferred to sensing signal adjuster 810 with gain control signal AG, so that the gain of control sensing signal conditioner 810.Thereby, adjust sensing signal V from the first and second reference light electric transducer PSA and PSB P1-V PMAmplitude so that it is transferred to analog to digital converter 820.
Control signal output unit 630 is transferred to driving voltage generator 950 with voltage control signal SG, changes control voltage V thus SGLevel.Control voltage V SGThe variation of level changed sensing signal V from the first and second reference light electric transducer PSA and PSB and PSDA P1-V PMAmplitude.
Like this, owing to control back light unit 900, driving voltage generator 950 and sensing signal adjuster 810, has the sensing signal V of suitable amplitude by reception in response to sense conditions SM P1-V PM, can determine exactly in response to the contact information that touches.
Perhaps, in the process flow diagram of Figure 11, operating unit 620 is from such as determining sense conditions SM three possibilities of " 0 ", " 1 " and " 2 ".
At first, operating unit 620 is initialized as " 2 " (S50) with sense conditions SM.Then, operating unit 620 relatively second state is judged the signal V2 and the first predetermined value Vthi1, so that judge that in response to second state signal V2 less than the first predetermined value Vthi1, remains " 2 " with sense conditions SM.Judge signal V2 greater than the first predetermined value Vthi1 in response to second state, operating unit 620 relatively second state is judged the signal V2 and the second predetermined value Vthi2 (S60).As the comparative result of operation (S60), judge signal V2 less than the second predetermined value Vthi2 in response to second state, operating unit 620 remains " 2 " with sense conditions SM.Judge signal V2 greater than the second predetermined value Vthi2 in response to second state, operating unit 620 relatively first state is judged signal V1 and the 3rd predetermined value Vthi3 (S65).As the comparative result of operation (S65), judge signal V1 less than the 3rd predetermined value Vthi3 in response to first state, operating unit 620 becomes sense conditions SM into " 0 " (S70).Judge signal V1 greater than the 3rd predetermined value Vthi3 in response to first state, operating unit 620 becomes sense conditions SM into " 1 " (S80).
When sense conditions was " 0 ", relatively second state was judged signal V2 and value Vths1 (S75).Judge that in response to second state signal V2 less than value Vths1, becomes sense conditions SM into " 2 ", and judge that in response to second state signal V2 greater than value Vths1, remains " 0 " with sense conditions SM.
When sense conditions is " 1 ", relatively second state is judged signal V2 and value Vthw1 (S85), judge that in response to second state signal V2 is less than value Vthw1, sense conditions SM is become " 2 ", and judge signal V2 greater than value Vthw1 in response to second state, relatively first state is judged signal V1 and value Vthw2 (S90).As the comparative result of operation S90, judge that in response to first state signal V1 less than value Vthw2, becomes sense conditions SM into " 0 ", and judge that in response to first state signal V1 greater than value Vthw2, remains " 1 " with sense conditions SM.
In above-mentioned such example, the sense conditions SM of " 0 " can be for example corresponding to outdoor brightness, the sense conditions SM of " 1 " can be for example corresponding to the brightness in the bright room, and the sense conditions SM of " 2 " can be for example corresponding to the brightness in the dark room.
In the example of two sense conditions SM and three sense conditions SM, control signal output unit 630 is all controlled back light unit 900, driving voltage generator 950 and sensing signal adjuster 810 in response to sense conditions SM.For example, when surround lighting is sufficient, reduce control voltage V SG, perhaps reduce the gain of sensing signal adjuster 810.Yet, in the example of three sense conditions, can carry out light modulation (dimming) control of the brightness of the lamp that is used to control back light unit 900, and the control voltage V of controlling and driving voltage generator 950 in more detail SGGain with sensing signal adjuster 810.
Perhaps, operating unit 620 can be configured to determine sense conditions SM at 4 or how possible state, and can judge that signal V1, V2 and V3 judge sense conditions SM in response to state.
LCD device according to exemplary embodiment of the present can also comprise the photoelectric sensor (not shown), and it has with the PSDA same structure and is blocked all surround lightings and LBU.Such sensor is only exported sensing signal in response to temperature, and by considering Temperature Influence, can carry out more stable photoelectricity sensing thereby PSDA can determine the sense conditions SM that comprises such responsive to temperature sensing signal.
Now, referring to Figure 12 and 13 and in conjunction with Fig. 8 a kind of LCD device is described, this LCD device can use the first reference light electric transducer PSA and the second reference light electric transducer PSB to obtain the best sensing signal that changes corresponding to surround lighting from PSDA.
Figure 12 illustrates the waveform of the sensing signal of the PSDA that depends on sensing modes in the LCD device according to another exemplary embodiment of the present invention, and Figure 13 is the exemplary process diagram of sensing signal of PSDA that is used for controlling the LCD device according to another exemplary embodiment of the present invention.
LCD device according to this exemplary embodiment comprises sensing signal processor 800, signal controller 600, and back light unit 900 and driving voltage generator 950, as shown in Figure 8.
Sensing signal processor 800 comprises sensing signal adjuster 810 and analog to digital converter 820, and signal controller 600 comprises signal input unit 610, operating unit 620 and control signal output unit 630.The operation of sensing signal processor 800 and signal input unit 610 is with top described substantially the same referring to Fig. 8, thereby will omit detailed explanation.
Waveform in response to the sensing signal of the PSDA that touches will be described now.
In Figure 12, transverse axis is represented the sensing signal line P about LC panel assembly 300 1-P mThe X coordinate, and the longitudinal axis is represented corresponding to the sensing signal V in the X coordinate P1-V PMVoltage level.Sensing signal V P1-V PMBe the output signal that is connected to the PSDA on one of them sensing sweep trace Si for example, and hypothesis touch the infall that occurs in one of them sensing sweep trace Si and one of them sensing signal line PT.In addition, for convenience of explanation for the purpose of, at touch location X (P T) the sensing signal V of the PSDA that locates PTBe known as " touch voltage ", and at the sensing signal V of the PSDA at non-touch location place B1And V B2Be known as " background voltage ".
Waveform among Figure 12 (1) is the sensing signal waveform that is known as under the sensing modes of shadow mode (shadow mode), under this shadow mode, touches voltage V PTBe lower than background voltage V B1, and the waveform among Figure 12 (2) is the sensing signal waveform that is known as under the sensing modes of backlight mode, under this backlight mode, touches voltage V PTBe higher than background voltage V B2Shadow mode is represented environment light intensity height (bright), and in this case, the amount of surround lighting is greater than the amount owing to the reflection LBU that touches, thus touch voltage V PTBe lower than background voltage V B1Backlight mode is represented environment light intensity lower (darker), and in this case, surround lighting is less than reflection LBU, thus touch voltage V PTBe higher than background voltage V B2Background voltage V B1And V B2Depend primarily on the environment light intensity and determine, and touch voltage V PTThe brightness that depends primarily on back light unit 900 is determined.
The sensing signal V that signal controller 600 receives corresponding to waveform among Figure 12 (1) or waveform (2) P1-V PM, and relatively whether its amplitude to judge touch and touch location has taken place.In other words, when voltage level surpassed the background voltage level of preset range, signal controller 600 was defined as the existence of this voltage level to touch, and extracts touch location subsequently.
Yet, if the LCD device between shadow mode and backlight mode, in other words, as background voltage V B1-V B2With touch voltage V PTBetween poorly (use Δ V S1With Δ V S2Expression) when very little, is difficult to distinguish determine whether to have taken place touch and touch location.Therefore, sensing signal need be remained predetermined amplitude.
Now, with reference to operating unit 620 and the control signal output unit 630 of Figure 13 detailed description according to the LCD device of another exemplary embodiment of the present invention, wherein sensing signal is controlled so as to and makes Δ V S1With Δ V S2Remain predetermined amplitude.
Touch location X (P T) PSDA that locates is blocked surround lighting owing to touching, thereby is in basically and the identical state of the second reference light electric transducer PSB that is blocked surround lighting.Therefore, touch voltage V PTHas substantially the same voltage level with the sensing signal of the second reference light electric transducer PSB.In addition, the PSDA of no touch position is provided surround lighting and LBU, thereby is in the identical state with the first reference light electric transducer PSA basically.Therefore, the sensing signal of the background voltage and the first reference light electric transducer PSA has substantially the same voltage level.As a result, the not substantially the same poor Δ V between the first reference light electric transducer PSA and the second reference light electric transducer PSB of difference between the touch voltage of background voltage and touch location and no touch position SIn the present embodiment, use the first reference light electric transducer PSA and the second reference light electric transducer PSB, the amplitude of the control voltage of control PSDA, and the brightness of the lamp of the gain of control sensing signal conditioner 810 and back light unit 900 are so that make poor Δ V SCan be positioned at preset range.
In the present embodiment, for convenience of explanation, identical label is respectively applied for backlight control signal BLC and calculates the backlight control variable of backlight control signal BLC, gain control signal AG and gain control variable, and voltage control signal SG and Control of Voltage variable, and control signal output unit 630 is transferred to back light unit 900 respectively with control variable BLC, AG and the SG that calculates, and sensing signal adjuster 810 and driving voltage generator 950 are as control signal.
At first, this operation beginning (S100), and operating unit 620 and control signal output unit 630 initialization back light units 900 and sensing signal adjuster 810 (S105).Control signal output unit 630 replaces minimum value BLC backlight with backlight control variable BLC L, so that be transferred to back light unit 900, and with gain control variables A G replacement gain intermediate value AG MID, so that be transferred to sensing signal adjuster 810.Then, in response to minimum value BLC backlight L, for example 15mA operation of the steady current of back light unit 900 usefulness standards.
Subsequently, operating unit 620 is with sensing signal V SAWith the value of setting V BLAnd V BHCompare (S110).
After operation S110 compares, in response to sensing signal V SALess than value V BLAnd greater than value V BH, once more with sensing signal V SAWith value V BLCompare (S120).
As a result, in response to sensing signal V SALess than value V BL, add voltage change Δ SG to Control of Voltage variable SG, producing the Control of Voltage variable SG ' that revises (S125), and in response to sensing signal V SAGreater than value V BL, with sensing signal V SAWith value V BHCompare (S130).
After operation S130 compares, in response to sensing signal V SAGreater than value V BH, from Control of Voltage variable SG, deduct voltage change Δ SG, with the Control of Voltage variable SG ' that produce to revise (S135), and in response to sensing signal V SALess than value V BL, repetitive operation 20.
During operation S110 to S135, the control voltage V of control PSDA and first and second reference light electric transducer PSA and PSB SG, make the sensing signal V of the reference light electric transducer PSA that wins SACan be in value V BLWith value V BHBetween.Like this, background voltage and touch voltage all are within the preset range, thereby the sensing signal of PSDA is imported into signal controller 600 undistortedly.
Perhaps, the input voltage of control PSDA and first and second reference light electric transducer PSA and PSB but not control voltage V SG, make the sensing signal V of the reference light electric transducer PSA that wins SACan be in value V BLWith value V BHBetween.
After operation S110 compares, in response to sensing signal V SABe in value V BLWith value V BHBetween, with the difference Δ V of the sensing signal of the first and second reference light electric transducer PSA and PSB SWith the value of setting Δ V SLWith Δ V SHCompare (S140).
As a result, in response to difference Δ V SBe in the value of setting Δ V SLWith Δ V SHBetween, repetitive operation S110, and in response to difference Δ V SLess than Δ V SLPerhaps greater than Δ V SH, with gain control variables A G and gain maximum AG MAXCompare, and will differ from Δ V SWith value Δ V SLCompare (S150).
After operation S150 compared, G was different from gain maximum AG in response to the gain control variables A MAXPerhaps poor Δ V SGreater than Δ V SL, then will differ from Δ V SWith value Δ V SLCompare (S160).
As a result, in response to difference Δ V SLess than value Δ V SL, then add change in gain value Δ AG to gain control variables A G, producing the gain control variables A G ' that revises (S165), and in response to difference Δ V SGreater than value Δ V SL, will differ from Δ V SWith value Δ V SHCompare (S170).
After operation S170 compares, in response to difference Δ V SGreater than value Δ V SH, from gain control variables A G, deduct change in gain value Δ AG, with the gain control variables A G ' that produce to revise (S175), and in response to difference Δ V SLess than value Δ V SH, repetitive operation S110.
In operation S140 to S175, the gain of control sensing signal conditioner 810 makes the difference Δ V of first and second reference light electric transducer PSA and PSB SCan be in value Δ V SLWith value Δ V SHBetween.For example, for less poor Δ V S, increase the gain of sensing signal adjuster 810, and for bigger poor Δ V S, reduce the gain of sensing signal adjuster 810.Like this, be positioned at the poor Δ V of preset range SClearly recognize background voltage and touch voltage, thereby judge whether to have taken place touch.
After operation S150 compares, be gain maximum AG in response to gain control variables A G MAXAnd difference Δ V SLess than value Δ V SL, add changing value Δ BLC backlight (S180) to backlight control variable BLC, and with backlight control variable BLC and maximal value BLC backlight HCompare (S185).
In operation after S185 compares, in response to backlight control variable BLC less than maximal value BLC backlight H, repetitive operation S110, and in response to backlight control variable BLC greater than maximal value BLCH backlight, substitute gain minimum value AG with gain control variables A G MIN(S190), then, BLC substitutes minimum value BLC backlight with the backlight control variable LAnd repetitive operation S110 (S195).
In operation S150 to S165, in response to the gain of adjusting sensing signal adjuster 810 howsoever, difference Δ V SThe value of being not more than Δ V all SL, the brightness that then improves back light unit 900 is to enlarge poor Δ V SIn other words, in any case when the gain of adjusting sensing signal adjuster 810 owing to the faint intensity of surround lighting was all distinguished not open background voltage and touched voltage, the brightness that improves back light unit 900 was to enlarge the sensing signal V of the second reference light electric transducer PSB SBTouch voltage with PSDA.Then, the sensing modes of LCD device changes to backlight mode from shadow mode, thereby background voltage and touch voltage are differentiated.
In operation S180 to S185, in response to no matter whether backlight control variable BLC is greater than maximal value BLC backlight H, difference Δ V SAll less than value Δ V SL, then the environment light intensity is confirmed as being enhanced, thus the gain of sensing signal adjuster 810 is minimized, and the brightness of back light unit 900 is allowed to have minimum value in operation S190 to S195.Correspondingly, in sensing modes, backlight mode is changed into shadow mode, thereby background voltage and touch voltage are differentiated.
As mentioned above, use the sensing signal V of the first and second reference light electric transducer PSA and PSB SAAnd V SBAnd sensing signal V SAAnd V SBPoor Δ V SControl voltage, the gain of sensing signal adjuster 810 and the brightness of back light unit 900 of control PSDA make that the touch voltage of background voltage and PSDA can be differentiated.Correspondingly, the sensing signal of signal controller 600 reception PSDA determines whether to have taken place touch and touch location.
In the present embodiment, signal input unit 610, operating unit 620 and control signal output unit 630 usefulness DLC (digital logic circuit) realize, for example use to be included in the single-chip or to be included in microprocessor in the chip that comprises sensing signal processor or programming that the ASIC special IC carries out.
Although the LCD device that is provided with back light unit has been described above, the present invention is not limited to this, but can be used in other non-emission display that is provided with back light unit.
According to the present invention, this LCD comprises first reference light photodetector that depends on surround lighting and the second reference light electric transducer that only depends on LBU, so that judge the environment light intensity, carry out the photoelectricity sensing of PDSA thus exactly and control the brightness of back light unit according to the sensing signal of the second reference light electric transducer.
In addition, might obtain the sensing signal of PSDA, use the sensing signal of reference light electric transducer, this sensing signal by control PSDA can judge the touch information that depends on touch, and no matter how external environment condition changes.
Though reference example embodiment has described the present invention, but be to be understood that, the present invention is not limited to embodiment disclosed herein, and on the contrary, the present invention is intended to contain all changes, change and the equivalent arrangements in the spirit and scope that fall into appended claims.
The application requires korean patent application 2004-0042574 number submitted on June 10th, 2004 and the right of priority of the korean patent application submitted on August 13rd, 2004 2004-0064038 number, and the full content of these applications is introduced in this with for referencial use.

Claims (33)

1. display device comprises:
Panel assembly;
Back light unit provides light to described panel assembly;
First photoelectric sensor is provided surround lighting and from the light of described back light unit, to produce first sensing signal;
Second photoelectric sensor is blocked described surround lighting and the reception light from described back light unit, to produce second sensing signal;
Sensing signal processor receives and handles from described first and second sensing signals of described first and second photoelectric sensors; And
Signal controller, determine sense conditions in response to described environment light intensity, and carry out expectant control according to described sense conditions and operate, wherein said environment light intensity basis is determined from first sensing signal of the processing of described sensing signal processor and second sensing signal of handling.
2. display device as claimed in claim 1, wherein said signal controller produces at least one state according to first and second sensing signals of handling and judges signal, and judge that in response to described at least one state signal determines described sense conditions, and described at least one state judges that signal comprises the first judgement signal corresponding to the difference between first and second sensing signal of described processing.
3. display device as claimed in claim 2, wherein said signal controller is controlled the gain of described sensing signal processor, to adjust the amplitude of described first sensing signal.
4. display device as claimed in claim 2, wherein said signal controller are controlled the brightness of described back light unit in response to described sensing signal.
5. display device as claimed in claim 2, wherein said first photoelectric sensor comprises sensing element, and described signal controller controls the control voltage of described sensing element, to adjust the susceptibility of described first photoelectric sensor.
6. display device as claimed in claim 2, wherein said sensing signal processor are amplified described first and second sensing signals, and first and second sensing signals that will amplify are converted to digital signal.
7. display device as claimed in claim 2, wherein said at least one state judges that signal also comprises:
Second judges signal, allows the difference between first sensing signal of peak signal and described processing corresponding to the input of described sensing signal processor; With
The 3rd judges signal, allows the difference between second sensing signal of minimum signal and described processing corresponding to described input.
8. display device as claimed in claim 7, wherein said sense conditions comprise in first state and second state, and
In described first state as original state, judge that greater than first value of setting and described second signal is less than second value of setting in response to the described first judgement signal, described signal controller changes over described second state from described first state, and judge that less than described first value of setting and described second signal is greater than one in described second value of setting in response to the described first judgement signal, described signal controller keep described first state and
In described second state, judge that less than the 3rd value of setting and the described the 3rd signal is less than the 4th value of setting in response to the described first judgement signal, described signal controller changes over described first state from described second state, and judge signal greater than one in described the 4th value of setting in response to the described first judgement signal greater than described the 3rd value of setting and the described the 3rd, described signal controller keeps described second state.
9. display device as claimed in claim 7, wherein said sense conditions comprise in first state, second state and the third state, and
In described first state as original state, judge that greater than first value of setting and described second signal is greater than second value of setting in response to the described first judgement signal, described signal controller changes over described second state from described first state, and, judge that greater than described first value of setting and described second signal is less than described second value of setting in response to the described first judgement signal, described signal controller changes over the described third state from described first state, and judge that in response to described first signal is less than described first value of setting, described signal controlling keep described first state and
In described second state, judge that in response to described first signal is less than the 3rd value of setting, described signal controller changes over described first state from described second state, and judge that greater than described the 3rd value of setting and described second signal is greater than the 4th value of setting in response to the described first judgement signal, described signal controller keeps described second state, and judge that greater than described the 3rd value of setting and described second signal is less than described the 4th value of setting in response to the described first judgement signal, described signal controller changes over the described third state from described second state, and
In the third state, judge that in response to described first signal is less than the 5th value of setting, described signal controller changes over described first state from the described third state, and judges signal greater than described the 5th value of setting in response to described first, and described signal controller keeps the described third state.
10. display device as claimed in claim 1, wherein said first and second photoelectric sensors comprise the sensing element that contains amorphous silicon or polysilicon.
11. display device as claimed in claim 1, wherein said first photoelectric sensor is arranged in the viewing area of described panel assembly, and described second photoelectric sensor is arranged on the outside of described viewing area.
12. display device as claimed in claim 1 also comprises temperature sensor, it is blocked described surround lighting and from the light of described back light unit, and produces the 3rd sensing signal, but also carries out described expectant control operation in response to described the 3rd sensing signal.
13. a driving method that is provided with the display device of back light unit, wherein back light unit provides light, and described method comprises:
At the first photoelectric sensor place reception environment light with from the light of described back light unit, to produce first sensing signal;
Block described surround lighting and reception light at the second photoelectric sensor place, to produce second sensing signal from described back light unit;
In response to described first and second sensing signals, the generation state is judged signal; And
In response to the described environment light intensity of judging the signal indication by described state, determine sense conditions;
Wherein said state is judged the difference between described first and second sensing signals of signal indication.
14. method as claimed in claim 13 also is included in the amplitude of adjusting described first sensing signal in the preset range.
15. method as claimed in claim 13 also comprises the brightness of adjusting described back light unit in response to described sense conditions.
16. a display device comprises:
Panel assembly;
Back light unit provides light to described panel assembly;
First photoelectric sensor, reception environment light and from the light of described back light unit, to produce first sensing signal;
Second photoelectric sensor is blocked described surround lighting and the reception light from described back light unit, to produce second sensing signal;
The 3rd photoelectric sensor receives the described surround lighting of book and from the light of described back light unit, to produce according to the 3rd sensing signal that touches;
Sensing signal processor is handled described first to the 3rd sensing signal from described first to the 3rd photoelectric sensor; And
Signal controller is adjusted described the 3rd sensing signal according to first and second sensing signals of handling.
17. display device as claimed in claim 16, wherein said signal controller are adjusted described the 3rd sensing signal, make difference between first and second sensing signals of described processing between first value of setting and second value of setting.
18. display device as claimed in claim 17, wherein said signal controller adjustment is input to the control voltage of described the 3rd photoelectric sensor, so that adjust described the 3rd sensing signal.
19. display device as claimed in claim 17, wherein said signal controller is adjusted the gain of described sensing signal processor, so that adjust described the 3rd sensing signal.
20. display device as claimed in claim 17, wherein said signal controller is adjusted the brightness of described back light unit, so that adjust described the 3rd sensing signal.
21. display device as claimed in claim 17, wherein said signal controller adjustment is input to the control voltage of described the 3rd photoelectric sensor, makes the value of first sensing signal of described processing between the 3rd value of setting and the 4th value of setting.
22. display device as claimed in claim 21, wherein, in response to first sensing signal of described processing less than described the 3rd value of setting, add voltage change to described control voltage, and greater than described the 4th value of setting, from described control voltage, deduct described voltage change in response to the sensing signal of described processing.
23. display device as claimed in claim 17, wherein, in response to described difference less than described first value of setting, gain to described sensing signal processor increases the change in gain value, and greater than described second value of setting, from the gain of described sensing signal processor, deduct described change in gain value in response to described difference.
24. display device as claimed in claim 23, wherein, in response to the gain of described sensing signal processor be gain maximum and described difference less than described first value of setting, the brightness of described back light unit is enhanced the predetermined variation value.
25. display device as claimed in claim 24 wherein, is a maximum changing value in response to the brightness of described back light unit, the gain of described sensing signal processor is changed into the gain intermediate value, and the brightness of described back light unit is changed into the minimum change value.
26. display device as claimed in claim 16, wherein said first and second photoelectric sensors comprise first and second sensing elements respectively, and first and second sensing signals of described processing are respectively the mean value of the output signal of described first and second sensing elements.
27. display device as claimed in claim 16, the wherein said first and the 3rd photoelectric sensor is arranged in the viewing area of described panel assembly, and described second photoelectric sensor is arranged on the outside of described viewing area.
28. display device as claimed in claim 16 also comprises resistance light member, the blocking-up surround lighting arrives second photoelectric sensor.
29. display device as claimed in claim 28, wherein said resistance light member are the black matrixes that prevents the light leakage of described panel assembly.
30. display device as claimed in claim 28, wherein said resistance light member are the reflecting members of the described surround lighting of reflection.
31. display device as claimed in claim 16, wherein said sensing signal processor and described signal controller are included in the single-chip.
32. a driving method that is provided with the display device of back light unit, wherein back light unit provides light, and described method comprises:
At the first photoelectric sensor place reception environment light with from the light of described back light unit, to produce first sensing signal;
Block described surround lighting and reception light at the second photoelectric sensor place, to produce second sensing signal from described back light unit;
Receive described surround lighting at the 3rd photoelectric sensor place and from the light of described back light unit, to produce according to the 3rd sensing signal that touches; And
Adjust described the 3rd sensing signal in response to described first and second sensing signals.
33. driving method as claimed in claim 32 is wherein adjusted described the 3rd sensing signal and is also comprised described the 3rd sensing signal of adjustment, makes that the difference between described first and second sensing signals is between first value of setting and second value of setting.
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