CN100416480C - Input sensor containing display device and method for driving the same - Google Patents
Input sensor containing display device and method for driving the same Download PDFInfo
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- CN100416480C CN100416480C CNB2005100817494A CN200510081749A CN100416480C CN 100416480 C CN100416480 C CN 100416480C CN B2005100817494 A CNB2005100817494 A CN B2005100817494A CN 200510081749 A CN200510081749 A CN 200510081749A CN 100416480 C CN100416480 C CN 100416480C
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Abstract
The present invention provides a display device containing an input sensor (for example, a photoelectric converting element) which device can efficiently and flexibly process display data, read data, and association data. The display device has a group of pixel circuits (1311) arranged in a matrix, a group of optical sensor circuits (1312) arranged in a matrix, a display driving circuit (112, 114) which provides a display signal to the display element group and which provides a driving signal to the display element group, a read circuit (122, 123, 124) which identifies an optical sensor to read a sense signal from this optical sensor, and a read signal processing section (306) which processes the sense signal output by the read circuit in accordance with a command. The read signal processing section has an interface section (302) which transfers, when the command requesting execution of an application is set to the interface section, the command to a command register (306).
Description
Technical field
The present invention relates to use the panel display apparatus of liquid crystal or light-emitting component, particularly comprise the display device that contains input pickup of input pickup.
Background technology
Liquid crystal indicator comprises array base palte, and wherein signal wire, sweep trace and pixel transistor (for example thin film transistor (TFT)) are arranged in straight line, also comprise the driving circuit of drive signal line and sweep trace.Recently progress of integrated circuit technique and development have been used for practice, utilize advanced technology to form the part of driving circuit on the array base palte.This technology is used for reducing the size of weight, thickness and entire liquid crystal display device.Therefore, liquid crystal indicator is widely used in various portable equipments, for example cell phone and notebook computer.
A kind of liquid crystal indicator has been proposed, wherein photo-electric conversion element is arranged on the array base palte, is written into (image loading) function Japanese patent application of disclosed 2001-292276 number and 2001-339640 number of KOKAI (for example referring to) so that additional image to be provided.
In this liquid crystal indicator, change with the variation of amount of charge in the capacitor that photo-electric conversion element links to each other with the light quantity that receives by photo-electric conversion element.The voltage carries out image of passing capacitor by detection is written into.
Recently, the technology of utilizing many silicon technologies to form pixel transistor and driving circuit on glass substrate grows up.Also can use many silicon technologies easily to form the photo-electric conversion element adjacent with each pixel transistor.
If display element and photo-electric conversion element (optical sensor) are made liquid crystal indicator, must possess the display data processing apparatus that is used to drive display element and be used to handle the data processing equipment of the data that read from photo-electric conversion element.In addition, if relevant by the image content displayed, then need a kind of related data treating apparatus of handling its relation with the data that read (view data of acquisition) content (sequential, coordinate position and other similar content) by display element.Further, owing to the operation of the data content that reads according to the user changes, it is very important that the related data treating apparatus has various application.
Further, if data will read from photo-electric conversion element, its reading speed can have problems.For example, when display device was used as guidance panel, touch operation can frequently be carried out at high speed.In order to respond to this high speed touch operation, data read also must be to transmit at a high speed.
In addition, above-mentioned optical sensor is made up of the many silicon thin film transistors of low temperature (Poly-Si-TFT).In order to obtain output,, use amplifier usually because have only little electric current to be used for photoresponse from optical sensor.But, in display device,, have significant characteristic (or detecting performance) difference between the amplifier because the TFT amplifier is arranged on the glass substrate.Because significant property difference between this amplifier, testing result is insecure.This can cause the incorrect identification of testing result.Therefore, reliability of products can reduce.
Summary of the invention
Therefore, according to one aspect of the present invention, a kind of display device is provided, comprise input pickup (for example photo-electric conversion element), this device is deal with data and have various application neatly, simultaneously effectively processes and displays data, reading of data and the data about concerning between video data and the image pickup data.
According to another aspect of the present invention, a kind of display device that comprises input pickup (for example photo-electric conversion element) is provided, this device can improve data reading speed.
According to another aspect of the present invention, may avoid the unsettled especially result of detection owing to property difference generation between the amplifier that obtains optical sensor output,, read thereby realize stablizing.Further, the method of the display device (input device containing display device) that a kind of driving comprises input media is provided, this method is fixed for importing the signal wire enforcement of shows signal by effective utilization, and need not increase number of elements.
One embodiment of the present of invention comprise one group of display element of arranging with matrix form, one group of sensor of arranging with matrix form, shows signal is provided and the display driver circuit of drive signal is provided to every row of display element group to every row of display element group, read circuit, defined the row and column of optical sensor group, be used for reading transducing signal to discern an optical sensor from this optical sensor, read signal processing apparatus, carry out the instruction of using according to request, be used to handle the transducing signal and the interface portion that read circuit output, the instruction of asking execution to be used be sent to read signal processing apparatus.
As mentioned above, this display device has the signal processing apparatus of reading, and foundation asks to carry out the instruction of using, and is used to handle the transducing signal that reads circuit output, and interface portion, the instruction of asking this application of execution is sent to reads signal processing apparatus.Therefore, can carry out various processing to improve dirigibility.
An alternative embodiment of the invention comprises the display element circuit bank, comprise a plurality of a plurality of display elements of arranging with matrix form, the sensor circuit group, comprise the optical sensor of arranging with matrix form, shows signal is provided and the display driver circuit of drive signal is provided to the line direction of display element circuit bank to the column direction of display element circuit bank; Read circuit, it is the part in a specified level cycle in the frame, a line direction and a plurality of column direction of definition optical sensor circuit group, thereby a group of specifying a plurality of optical sensor circuits, to read transducing signal from these a plurality of optical sensors, as computing output, read signal processing apparatus, be used to handle the transducing signal that reads circuit output.
By the transducing signal that reads circuit output is computing output from the transducing signal of a plurality of optical sensors.Compare with the situation that reads transducing signal from each optical sensor, reading speed sharply increases.
According to another aspect of the present invention, the present invention comprises amplifier (or amplifier element) substantially, being used in the future, the signal of autobiography sensor zooms into pixel, this sensor links to each other with the input of amplifier, the input voltage of each amplifier is made as the device of this amplifier operational threshold, and was used for before amplifier output signal the input voltage of amplifier device with the predetermined value conversion.
Another aspect of the present invention comprises Sensor section, wherein capacitor and photodiode constitute parallel circuit, and amplifier transistor, has a grid that electrode links to each other selecting part with sensor, difference is eliminated (difference canceling) transistor, between an electrode of electrode of amplifier transistor and Sensor section, connect, with the I/O transistor, has a electrode that electrode links to each other with amplifier transistor, first signal wire that links to each other with transistorized other electrode of I/O, the secondary signal line that links to each other with other electrode of amplifier transistor, the 3rd signal wire that links to each other with other electrode of Sensor section, eliminate the first grid polar curve that transistorized control grid links to each other with difference, the second grid line that links to each other with the transistorized control grid of I/O, at the pre-charge pressure of capacitor in the cycle, be used for providing first predetermined potential that the device of no-voltage is provided to the second and the 3rd signal wire simultaneously to first signal wire, eliminate transistor so that connect difference through the second grid line, connect the I/O transistor through the second grid line simultaneously, at pre-charge pressure in the difference elimination cycle after the cycle, be used for connecting difference and eliminate transistor through first grid polar curve, turn-off the transistorized device of I/O through the second grid line simultaneously, in Image Acquisition in the cycle, be used for turn-offing difference and eliminate transistor, turn-off the transistorized device of I/O through the second grid line simultaneously through first grid polar curve; In read cycle, be used for first predetermined potential being provided, simultaneously no-voltage being provided and the device of electromotive force is provided to the 3rd signal wire to the secondary signal line to first signal wire, this electromotive force is about half of the default maximum changing range of Sensor section, eliminate transistor so that turn-off difference, connect the I/O transistor through the second grid line simultaneously through first signal wire.
In the difference elimination cycle, the onset potential of said apparatus electric capacity is set to equal to amplify the threshold value Vth of body pipe.Therefore, detect according to light, substantially whether whether the voltage that passes capacitor changes the electromotive force that can rely on capacitor remains on threshold value Vth or reduces and determine.In read cycle, carry out based on this definite detection.In this case, this device determines whether the predetermined potential of signal wire changes, and promptly whether amplifier transistor still turn-offs or conducting.
Other purpose of the present invention and superiority propose in the following description, and part is conspicuous by description, or can be obtained by enforcement of the present invention.Purpose of the present invention and superiority can realize by following means of pointing out and combination and obtain especially.
Description of drawings
Accompanying drawing constitutes the part of instructions with instructions, has illustrated inventive embodiment, and the specific descriptions with top summary of the invention and following embodiment are used to explain principle of the present invention.
Fig. 1 is the block diagram of expression one embodiment of the invention;
Fig. 2 shows in the presentation graphs 1 and the block diagram of the structure of image capture data processing section;
Fig. 3 summarizes the block diagram of expression according to display of the present invention and Sensor section 100;
The chart of the particular instance of Fig. 4 A and Fig. 4 B remarked pixel circuit and sensor circuit and operation thereof;
Fig. 5 is that expression is according to each frame demonstration of the embodiment of the invention and the chart of Image Acquisition sequential;
Fig. 6 is the chart of expression according to another particular instance of image element circuit of the present invention and sensor circuit;
Fig. 7 is the structural drawing of summarizing circuit component in the presentation graphs 6;
Fig. 8 A and 8B are that expression is in order to describe the operational instances according to device of the present invention, the chart of image and sampling time sequence;
Fig. 9 is that expression is included in the chart according to the noise measurement example in the operational instances of device of the present invention;
Figure 10 is the functional framework structural drawing according to the demonstration of this device of another aspect of the present invention and image capture data processing section;
Figure 11 represents to be included in the chart according to another noise measurement example in the operational instances of device of the present invention;
Figure 12 A and Figure 12 B are the charts of the example of the expression method of recovering suitable pre-charge pressure, and this pre-charge pressure is connected with image acquisition operations according to device execution of the present invention;
Figure 13 is illustrated on the inputting interface, utilizes method shown in Figure 12 to determine the instance graph that suitable pre-charge pressure distributes;
Figure 14 is the instance graph of expression according to the outward appearance of the display device that the present invention includes input pickup (input sensor containingdisplay device);
Figure 15 A and 15B represent if from sensor circuit reading electric charges, how the voltage on the signal wire changes;
Figure 16 A and Figure 16 B are the chart of expression according to another particular instance of image element circuit of the present invention and sensor circuit;
Figure 17 represents the demonstration of each frame in the circuit of Figure 16 and the chart of Image Acquisition sequential;
Figure 18 A is the chart of expression according to another particular instance of image element circuit of the present invention and sensor circuit;
Figure 18 B is the sequential chart of circuit operation among the presentation graphs 18A;
Figure 19 is the demonstration of each frame in the presentation graphs 18A circuit and the chart of Image Acquisition sequential;
Figure 20 represents how the voltage on the signal wire changes if from the sensor circuit reading electric charges;
Figure 21 is the chart of another particular instance of expression image element circuit shown in Figure 3 and sensor circuit;
Figure 22 is the image element circuit of expression among Figure 21 and the chart in time sequential routine of sensor circuit;
Figure 23 is the process flow diagram of control section that the image element circuit among Figure 21 and sensor circuit are controlled;
Figure 24 is that expression is according to the demonstration of each frame in the device of the present invention and the chart of Image Acquisition sequential;
Figure 25 is the chart of expression according to another example of the demonstration of each frame in the device of the present invention and Image Acquisition sequential.
Embodiment
A description will be given of an embodiment in accordance with the present invention with reference to the accompanying drawings.Fig. 1 represents the general structure of the display device that comprises input pickup (input sensor containing display device) according to one embodiment of the invention.The for example display and the Sensor section of liquid crystal are used in reference number 100 expressions.This display and Sensor section 100 comprise with the display element of matrix form two-dimensional arrangements and with the sensing element of matrix form two-dimensional arrangements.This structure will be described in detail later.
This Writing/Reading dedicated processes part 312 comprises read signal processing section and write signal processing section.This read signal processing section can be converted to the transducing signal of display and Sensor section 100 based on the various states of using.The process to display and Sensor section 100 transmission shows signal is carried out in this write signal processing section.
This Writing/Reading forbids that processing section 312 links to each other with Sensor section 100 with display through relay board 400.Power circuit, the digital to analog converter and the similar devices that are used for the conversion image data of display are installed in relay board 400.
The signal that offers display and Sensor section 100 is divided into display control signal roughly, shows rgb image data and Image Acquisition control data.The signal that reads from display and Sensor section 100 is an image capture data.
Fig. 2 represents to show that basic functional block diagram, particularly Writing/Reading with image capture data processing section 300 forbid processing section 301.The digital interface that reference number 302 expression and systems control division divide 200 interface 206, switch and LED processing section 313 to link to each other.The data that are written into interface 302 have can be by the type of data separating and 303 identifications of data translator unit.The outside signal storage that transmits is in order register 304.
305 storages of Image Acquisition condition and Image Acquisition form question blank are about the information of a plurality of Image Acquisition conditions (pre-charge pressure, Image Acquisition time and other).This information can divide 200 to write by systems control division through this interface, and can divide 200 to read by systems control division.Further, may monitor clock signal, so that control example is as the phase place by Writing/Reading sequential control part and data I/clock signal that O part 306 is exported by Writing/Reading sequential control part and data I/O part 306 generations.
Based on the control data from Image Acquisition condition and Image Acquisition form question blank 305, Writing/Reading sequential control part and data I/O part 306 output images obtain control signal and display control signal.In addition, the instruction of response instruction register 304, Writing/Reading sequential control part and data I/O part 306 can be obtained data to the external unit output image through data separating and data translator unit 303.Further, for memory image in SRAM 311 is obtained data, Writing/Reading sequential control part and data I/O part 306 can transmit data to SRAM control section 307.In addition, Writing/Reading sequential control part and data I/O part 306 can receive display image data and send it to display and Sensor section 100.When the data in being stored in SRAM311 were used as display image data, this view data sent to Writing/Reading sequential control part and data I/O part 306 through DRAM control section 307.When external data was used as display image data, this view data sent to Writing/Reading sequential control part and data I/O part 306 through data separating and data translator unit 303.
In addition, SRAM control section 307 can be stored through interface 302 and data separating and data translator unit 303 outside image and the control datas that send.SRAM control section 307 also can utilize image capture data to determine whether the user calculated preferred coordinate and touched display interfaces.
Therefore, microprocessor embeds each SRAM control section 307, Writing/Reading sequential control part and data I/O part 306, and Image Acquisition condition and Image Acquisition form question blank 305.Data processing operation in these microprocessors is synchronous.
In pattern description 2, generation Image Acquisition state switches to standard picture and obtains state, and vice versa.Obtain state at standard picture, display and Sensor section 100 can be closed (shutoff) display element part, make this device be used for Image Acquisition.Therefore may obtain to reduce the required data of Image Acquisition nonuniformity.
Close display element and mean that partly this display element is inoperative, thereby make light for example backlight output unevenly on whole display interfaces.In this state, the photo-electric conversion element in this sensor circuit only receives the light from the front.Light blocking film forms in this photo-electric conversion element back, to stop light backlight.
Further, following operating basis instruction is carried out.
The phase signal that is used for vision signal about reference signal perhaps utilizes the optimum timing of display and Sensor section 100 to cause Writing/Reading sequential control part and data I/O part 306 to carry out signal Processing through Writing/Reading sequential control part and data I/O part 306.Further, if the view data of two display screens is kept among the SRAM 111, switch this display screen immediately.If Image Acquisition condition and Image Acquisition form question blank 305 and the SRAM control section 307 that switches transfer mode (signal exchange (HS)/pulse) are sent to data separating and data translator unit 303 and interface 302 with the data of scheduled unit, then set transfer approach, transfer rate and other.The regulation sampling time sequence promptly is given for the sequential of obtaining data output by display and Sensor section 100 sampled images.Execution divides 200 write and allow instruction from systems control division, promptly allows to write through interface 302 data for Image Acquisition condition and Image Acquisition form question blank 305 and SRAM control section 307.
The instruction of responding system control section 200, interface 302 are carried out on order register 304 and are write processing.Further, interface 302 divides 200 receptions that Image Acquisition condition and the required data of Image Acquisition form are set from systems control division.Interface 302 further sends to data Image Acquisition form question blank 305.Interface 302 also divides 200 to receive the view data that will write SRAM 311 from systems control division.Interface 302 further sends to data SRAM control section 307.Interface 302 also receives result of calculation for example coordinate and touch information from SRAM control section 307.Interface 302 further sends to systems control division with this result and divides 200.
This sending mode comprises signal exchange (HS) (equaling 1.5Kbps).Data write order register 304 and Image Acquisition condition and Image Acquisition form question blank 305 with this speed.This sending mode comprises that also character string passes transmission (equaling 160Mbps).Under this pattern, data read from Image Acquisition condition and Image Acquisition form question blank 305, and data are write SRAM 311 and therefrom read.These sending modes can be selected to use.
Show and image capture data processing section 300 receives and is stored in systems control division and divides the various application of 200 various control sections 202 and divide the various instructions of 200 receptions based on this application from systems control division.
Therefore, can be used for according to the variety of way of using according to this device of the present invention.Show and image capture data processing section 300 that systems control division divides 200, and display and Sensor section 100 can integrate.Perhaps, demonstration and image capture data processing section 300 and display and Sensor section 100 can integrate, and simultaneity factor control section 200 can be independent of part 300 and 100.
Like this, according to the present invention, may provide various types of demonstrations and image capture data processing section 300, particularly digital interface 302.Especially, USB or radio modem unit can be used for outside the connection.In addition, digital interface 302 can be connected to cellular data I/O part.In addition, can be the RGB terminal or the YIQ terminal provides vision signal.
Fig. 3 is the functional block diagram of display and Sensor section 100.Reference number 130 remarked pixels and sensor array part have one group of display element and one group of optical sensor of arranging with matrix form of arranging with matrix form.The pixel and the sensor circuit of pixel and sensor array part 130 will be described later.
Show gate line drive circuit 112 and read gate line drive circuit 122 and form in a side (left side of figure) of pixel and sensor array part 130.Show that gate line drive circuit 112 drives each row of the display element group of arranging with matrix form.Read each row that gate line drive circuit 122 drives the optical sensor group of arranging with matrix form.
Signal-line driving circuit and pre-charge pressure circuit 114 form below pixel and sensor array part 130.Signal-line driving circuit and pre-charge pressure circuit 114 comprise signal-line driving circuit and pre-charge pressure circuit.
When in image element circuit pixel data being set, signal-line driving circuit provides pixel data to each row of the display element group of arranging with matrix form.The pre-charge pressure circuit is the precharge predetermined potential in each capacitor of the optical sensor group of arranging with matrix form.Signal wire and pre-charge pressure signal and Image Acquisition signal relation between the two.
Analog to digital conversion circuit 123 and data I/O circuit 124 forms above pixel and sensor array part 130.The analog signal conversion that analog to digital conversion circuit 123 will read from signal wire to optical sensor group is a digital signal.Analog to digital conversion circuit 123 is sent to data output circuit 124 with digital signal.Data output circuit 124 is converted to serial data with the data that are written into, and output image obtains data 125.
In this case, will be from showing and the Image Acquisition control signal 121 of image capture data processing section 300 is passed through relay boards 400 and be offered and read gate line drive circuit 122.Further, will offer demonstration gate line drive circuit 121 through relay boards 400 from the display control signal 111 of demonstration and image capture data processing section 300.In addition, will offer signal-line driving circuit and pre-charge pressure circuit 114 through relay board 400 from R, G, the B view data of demonstration and image capture data processing section 300.This R, G, B view data are converted to by the D/A converting circuit on the relay board 400 (DAC) and are suitable for the aanalogvoltage that the liquid crystal cells gray scale shows.This aanalogvoltage is write on the prearranged signals line through signal-line driving circuit then, writes then by in the pixel with the row arrangement that shows gate line drive circuit 121 definition.Further, pre-charge pressure control signal 115 is offered the capacitor of specified sensor circuit.The grey level of liquid crystal shows can be based on the frame rate control system.
Pixel and sensor (also can be described as the read/write pixel) part is made up of display pixel circuits (or display element circuit) 1311 and read sensor circuit 1312.
Fig. 4 A represents the example of read/write image element circuit structure.CS represents pressure-wire, and it offers predetermined potential at predetermined period the electrode of each auxiliary capacitor Csk and liquid crystal LC.Gate (m) is illustrated in and controllably turns on and off thin film transistor (TFT) (TFT in the image element circuit 1311; Be called driving transistors below) gate line.CRT (m) expression controllably turns on and off the reseting signal line of the thin film transistor (TFT) nt1 that forms sensor circuit 1312.When transistor nt1 opens, sensor capacitor CP pre-charge pressure.JVss represents ground wire.SFB (m) expression is for the electromotive force of read sensor capacitor C P, the sensor output control line of contacting thin-film transistor nt3.Thin film transistor (TFT) nt2 plays amplifier element.
PD represents photosensitive photodiode, produces the electric current corresponding with luminous flux.This makes the electric charge of having inserted sensor capacitor CP launch.Sig (n) and Sig (n+1) expression signal wire.
If it is photodiode PD is by a large amount of rayed, a large amount of from sensor capacitor CP discharge.On the contrary, if photodiode PD is shone by a little light, a small amount of from a large amount of electricity of sensor capacitor CP discharge.Photodiode PD and (not shown) backlight are accepted photoresistance and are handled.Therefore, photodiode PD is only to the photaesthesia from front incident, and to insensitive from direct light backlight.
As shown in Figure 3, signal wire Sig (n) and Sig (n+1) are connected to signal-line driving circuit 114 and analog to digital conversion circuit 123.Further, pressure-wire Cs and gate lines G ate (m) are connected to and show gate line drive circuit 112.Reseting signal line CRT (m), ground wire JVss and sensor output control line SFB (m) are connected to and read gate line drive circuit 122.
Fig. 4 B is the sequential chart of expression foregoing circuit operation.In this circuit, as described below, a specified level cycle in a vertical cycle (frame period) is provided with.This specified level cycle means carries out specific access to horizontal line in this cycle, propose image element circuit 1311 and sensor circuit 1312 on this horizontal line.Therefore, when the horizontal line that proposes sensor circuit 1312 was conducted interviews, a horizontal cycle was represented in the sequential chart shown in Fig. 4 B.The operation of image element circuit (or display element circuit) and sensor circuit.
Write cycle time
In image element circuit 1311, picture signal writes auxiliary capacitor Csk through signal wire Sig (n) by the path shown in arrow a1 in write cycle time (HT3).Drive this liquid crystal LC according to the magnitude of voltage on the capacitor C sk, show so that grey level to be provided.
Write cycle time is to the pre-charge pressure cycle
This null cycle (is write cycle time to image element circuit) afterwards, sensor circuit 1321 is connected transistor nt1 with to capacitor CP pre-charge pressure.Signal wire Sig (n) also is used for this situation (path shown in arrow b1 and c1).Be to depart from mutually in write cycle time (HT3) and pre-charge pressure cycle (HT4), effectively to utilize signal wire Sig (n).
The Image Acquisition cycle is to the output cycle
In the Image Acquisition cycle, when electric current was flowed through photodiode PD, pre-charge pressure changed.Then, in next first frame period, transistor nt3 connected in the output cycle (HT1).Then, the voltage of sensor capacitance CP is amplified by transistor nt2, and obtains through signal wire Sig (n+1) (seeing the path shown in arrow d1 and the e1).In pixel adjacent and sensor (also can be described as the read/write pixel) part, in this horizontal cycle, carry out similar operations.The output that process signal wire Sig (n+2) reads the sensor circuit of adjacency.At next horizontal scanning period, on next sweep trace, carry out similar operations.
After pre-charge pressure and before beginning to read, the voltage that obtains from sensor capacitance CP changed according to the time of photodiode crested.If photodiode is crested not, it is enough low that this reads voltage.If the photodiode crested for a long time, then can obtain high voltage.Can confirm whether to have input like this.
Fig. 5 is the chart of the above-mentioned every frame of expression (N frame and N+1 frame) operation.(1), (2) ... (n) expression first horizontal scanning period, second horizontal scanning period ..., the n horizontal scanning period.
The structure of pixel and Sensor section is not limited to the foregoing description.
Another example of the structure of Fig. 6 remarked pixel and Sensor section.This structure has as blue image element circuit 132B, the green pixel circuit 132G of image element circuit and red image element circuit 132R.Therefore, provide signal wire Sig (n) B, Sig (n) G and Sig (n) R to be associated with separately circuit 132B, 132G and 132R.Pressure-wire Cs, gate lines G ate (m), reseting signal line CRT (m) and sensor output control line SFB (m) are identical with role in circuit shown in Fig. 4 A.
In this circuit, signal wire has also obtained effective utilization.This is described below with reference to Fig. 4 B and sequential chart shown in Figure 5.Signal wire Sig (n) B, Sig (n) G and Sig (n) R are used for writing vision signal to corresponding capacitor Cs.Signal wire Sig (n) R is used in the pre-charge pressure cycle capacitor C P pre-charge pressure to predetermined potential.Signal wire Sig (n) G is used for launching in the Image Acquisition cycle electric current of the photodiode PD that flows through.The operation of this current emission can be carried out by a part of utilizing this cycle, thereby at the electromotive force of Image Acquisition cycle signalization line Sig (n) G.Signal wire Sig (n) B is used to amplify and read the voltage of capacitor C P, and output image obtains signal simultaneously.
For image element circuit 132B, 132G and 132R, except at specified level cycle (write cycle time), transistor 13a turn-offs; These circuit 132B, 132G and 132R are in the display cycle.
Fig. 7 represents the example that element distributes, and wherein the circuit of Fig. 6 forms on substrate.Appropriate section is represented by corresponding reference number.
Reading images is obtained data and is written into Writing/Reading and forbids processing section 312 through relay board 400, as shown in Figure 1.In this case, Writing/Reading forbids that processing section 312 is written into image capture data effectively.
Fig. 8 A and 8B represent an example of this situation, and wherein Writing/Reading forbids that processing section 312 is written into image capture data.For example, numerical key can show that this Image Acquisition signal can represent to have touched the state of arbitrary key as Fig. 8 A.In this case, useful image capture data mainly is the output from optical sensor, and this optical sensor is positioned at the part that shows this numerical key.
Like this, in according to device of the present invention, Writing/Reading is forbidden that processing section 312 is provided with, so only sampled in the corresponding zone (r1 to r12), the position with ten keys demonstrations shown in Fig. 8 B.For sampling time sequence, on the basis of the form of selecting from Image Acquisition condition and Image Acquisition form question blank 305, can generate sampling pulse HGP and VGP shown in Fig. 8 B, obtain data to utilize sequential recognition image based on these sampling pulses.Deal with data effectively can minimized on the basis of required sampled data like this.According to the present invention, various improvement have been implemented to improve the degree of accuracy that recognition image obtains data.
Fig. 9 represents to utilize being correlated with of frame to determine whether to have carried out the example of touch operation on the arbitrary key shown in Fig. 8 A and Fig. 8 B.For example, the pre-charge pressure that offers sensor capacitance CS is all different for every frame (for example in the 4-frame period).Then, if on numerical key, there is not executable operations,, then read the correlativity (deterministic process 91 determine result 92) of voltage (image capture data) demonstration corresponding to variable in the pre-charge pressure if on frame, carry out relevant treatment (interframe relevant 90).But, when one of numerical key is operated, discern a kind of phenomenon possibly, promptly do not obtain correlativity (determining result 93) corresponding to the variable in the pre-charge pressure (pre-determined relevancy).
Figure 10 represents another embodiment of demonstration illustrated in figures 1 and 2 and image capture data processing section 300.This example provides the viewing area and sequential is provided with tables of data 353 and video data output 35.Also provide image-acquisition area and sequential tables of data 361 and image capture data processing section 362 are set.Viewing area and sequential are provided with data and image-acquisition area and sequential and data are set through digital interface 351 with data are set are written into part 352 and are written into corresponding form.
For example previously described ten key view data can be stored in the video data output 354.Further, in order to show ten key view data, produce the required data storage of corresponding time sequence signal in form 353.Image capture data is provided with tables of data 361 output in image-acquisition area with by image-acquisition area and sequential sequential is provided with on the basis of data and is written into.This image capture data is handled by image capture data processing section 362, as Fig. 8 A, Fig. 8 B and shown in Figure 9.Also carry out the processing of determining content.
Image capture data must be converted to video data according to application.For example, if inputting characters by handwriting can be converted into the video data that is used to show.In this case, the conversion processing section 363 that image capture data is converted to video data is carried out conversion process.Conversion processing section 363 is sent to video data output 354 with final video data then.
Further, image capture data or can be sent to external unit by handling the data that image capture data obtains.In this case, this data accumulation sends in the part 364 in image capture data and deal with data, outputs to external unit through digital interface then.Generally speaking, provide the time sequential routine that is used for each unit, the gate of output and input is carried out under the control of microprocessing unit (MPU) 370.In addition, ROM 371 is storage version information on display and Sensor section 100, and storage can be by the information of this device processing in system.This information comprises for example horizontal resolution, vertical resolution, clock frequency and supply voltage customizing messages.This systems control division branch can read version information, can be by the application of display and Sensor section 100 processing with selection.
Figure 11 represents another embodiment according to device of the present invention.This device is particularly suitable for accurate read-write.The tip of pen 600 has the style of multiple annulus.Therefore, when nib contacted this sensor array, this sensor array was caught the pattern of multiple annulus according to the style on the nib.Because the style difference, this pattern can be analyzed and be discerned easily in image capture data processing section 362.Because annulus is not subjected to the hold a pen influence of angle of user, therefore is particularly suitable for this pattern.Arbitrarily angled the obtaining that identical image can tilt when the user holds a pen.
Can use multiple rectangle or multiple leg-of-mutton style to replace the style of multiple annulus.Alternatively, multiple annulus can be used as for example red (R) input and handles, and multiple rectangle can be used as for example blue (B) input and handles, and multiple triangle can be used as for example green (G) input and handles.This color can be discerned on the basis of pattern and distance between centers of tracks combination.Promptly when the pen with multiplet style was used for setting-out, this pattern and multiplet spacing can online starting point detect.Therefore, the multiplet spacing of pattern can be used for identifying information.For example, can utilize the style of multiple annulus to determine that distance between centers of tracks P1 is red, distance between centers of tracks P2 is green, and distance between centers of tracks P3 is blue.
(according to second embodiment of image-taking system)
Second embodiment is characterised in that the pre-charge pressure of sensor capacitance CP obtains in calibration image on result's the basis to be changed with sensor.In this calibration image is obtained, for example apply unevenly from light backlight.In this case, even on same chip, between the optical sensor that forms on the glass substrate (photodiode) PD or transistor nt2, have remarkable difference.Like this, unfriendly, some part of image can suitably show from the indication component light of the finger reflection of white for example, shows catoptrical disappearance in the dark simultaneously, and other parts can be because of underexposures or excessively shone the indicating section that stops correct detection.This is because the difference between the threshold value of difference between the electric current of the optical sensor of flowing through or transistor nt2.In this case, the pre-charge pressure of the sensor capacitance by increasing each sensor circuit can be avoided underexposure or excessively irradiation.
Especially, use following method.At first, for calibration image is obtained, solid-state even blank sheet of paper is closely contacted with display surface, and when the pre-charge pressure unification of sensor capacitance is made as 5 volts, obtain image.For calibration image is obtained, this can realize easily by the lid 150 of operative installations, is connected as a single entity according to display device of the present invention (display and Sensor section 100) and this device, and lid 150 internal spray are white, as shown in Figure 4.
At first, utilizing two pre-charge pressure level (5 volts and 4 volts) to carry out this calibration image obtains.Figure 12 A and Figure 12 B represent to obtain the example of image.
In Figure 12 B, although this electric capacity low-voltage of pre-charge pressure to 4 volt, the right side of the image that obtains is still too dark.Because for example under rayed, the very little electric current respective photosensor of flowing through is so be difficult to this part output white.Like this, for the Image Acquisition of reality, corresponding to sensor capacitance pre-charge pressure to 3.5 volt of the sensor circuit on display screen right side.Therefore this pre-charge pressure is reduced to and makes white be easy to output.
On the contrary, be difficult to this part output black, because for example under rayed, the very big electric current respective photosensor of flowing through.Like this, for the Image Acquisition of reality, corresponding to the sensor capacitance pre-charge pressure of the sensor circuit on display screen right side to for example 4.5 volts.Therefore this pre-charge pressure increases to and makes it be difficult to output.
The core that obtains image is corresponding with optical sensor, suitable current this optical sensor of flowing through.Like this, for the Image Acquisition of reality, corresponding to sensor capacitance pre-charge pressure to 4.0 volt of the sensor circuit of display screen middle body.
Figure 13 represents the comprehensive of foregoing.Above-mentioned Image Acquisition can be avoided fault, promptly avoids discerning or the wrong identification indication component is for example pointed.The information of the sensor capacitance precharging voltage value of each sensor circuit is kept among the SRAM 311, obtains in calibration image and determines this value on result's the basis.This information can be sent to the systems control division branch through digital interface 302, so that when activation system this required information is written into SRAM 311.Can be by the pre-charge pressure that utilizes DAC on the relay board and signal-line driving circuit to carry out this sensor capacitance.This is because every row is implemented pre-charge pressure and do not had video information to write, as Fig. 4 B and (if to all the sensors electric capacity while pre-charge pressure, can not increase or reduce the pre-charge pressure of each pixel) shown in Figure 5.But this sensor capacitance pre-charge pressure and need not add multiple level or to the partly additional pre-charge pressure circuit of frame.
In above-mentioned example, utilize two pre-charge pressure level (5 volts and 4 volts) to carry out calibration image and obtain.But level quantity and magnitude of voltage are not limited thereto.Two or more voltage levels also are effective.Voltage level quantity is many more, and it is careful that image rectification needs more.
In above-mentioned example, utilize three pre-charge pressure level (5 volts, 4.0 volts and 3.5 volts) to carry out real image and obtain.But voltage level quantity is many more, and it is careful that image rectification needs more.
For real image obtains, the pre-charge pressure of every group of pixel of each pixel or any grouping can increase or reduce.If it is use ten keys to show that situation for example shown in Figure 8 is used to detect indication component and whether has contacted arbitrary numerical key, only that above-mentioned pre-charge pressure correct application is enough in the sensor capacitance of the sensor circuit of the pixel of display digit key.This can determine by considering application, system resource and other.
The concise and to the point description of the general characteristic of the feature of each part and each the foregoing description will be provided.The present invention includes one group of display element of arranging with matrix form, one group of optical sensor of arranging with matrix form, shows signal is provided and the display driver circuit of drive signal is provided to every row of display element group to every row of display element group, with read circuit, defined the row and column of optical sensor group, be used for reading transducing signal from this optical sensor to discern an optical sensor.Be called by the transducing signal that reads circuit output and read signal processing, it carries out the instruction of using according to request, carries out and handles.
In this case, read signal processing and provide order register and interface portion, be used to receive request and carry out the instruction of using, send instruction to order register.This provides a kind of enough devices flexibly of carrying out various processing procedures.
Read signal processing and can comprise the device of generation based on the view data of transducing signal.Read signal processing and also can comprise the device of generation corresponding to the coordinate data on the optical sensor of transducing signal.Read signal processing and can comprise that also generation is corresponding to the view data of transducing signal and view data is fed back to the device of display driver circuit.So just may in display image, reflect input information.
It is a kind of for reading the driving method of circuit setting operation sequential that the present invention also provides.This method comprises: for each image element circuit constitutes the display element group, set for first and second null cycles in the preceding semiperiod and the later half cycle of horizontal cycle respectively, between first and second null cycles, set video write cycle, after second null cycle and before the next frame period, set the display cycle, and be that each sensor circuit constitutes sensor groups, to be set at read cycle corresponding to the cycle of first null cycle of a horizontal cycle, to be set at the pre-charge pressure cycle corresponding to the cycle of second null cycle, at read cycle and pre-charge pressure be set a null cycle between the cycle, after the cycle and before the next frame period be set an Image Acquisition cycle at pre-charge pressure.Need not influence demonstration like this and just may realize writing (Image Acquisition).
As a result, shown in Fig. 4 A and Fig. 4 B, be used to write the signal wire Sig (n) of video data and the read line that Sig (n+1) effectively is utilized as Image Acquisition.
That is to say, shows signal (view data) is provided and provides the demonstration gate line drive circuit 112 that the display driver circuit of drive signal comprises output drive signal and the data output circuit (signal-line driving circuit and pre-charge pressure circuit 114) of output shows signal to every row of display element group to every row of display element group.The signal wire of output shows signal is connected with the auxiliary capacitor of image element circuit, and by switch be connected with optical sensor (seeing Fig. 4 A, Fig. 4 B and Fig. 6).
Signal wire also is used for the electric capacity pre-charge pressure in parallel with this optical sensor (seeing Fig. 4 A and Fig. 4 B).Signal wire is also as the secondary signal line (seeing Fig. 4 A and Fig. 4 B) that obtains the change in voltage of the electric capacity in parallel with optical sensor by amplifier and switch.
Image element circuit by each have R, the G of signal wire, the image element circuit of B is formed.Sensor circuit comprises optical sensor and the electric capacity in parallel with optical sensor, it is characterized in that utilizing first signal wire precharging to press, and utilizes the secondary signal line to discharge during Image Acquisition, utilizes the 3rd signal wire to read the capacitance voltage (see figure 6).Certainly, this sensor circuit can provide each in R, G, the B image element circuit.
Read the sampling apparatus (see figure 8) that signal processing also comprises the specific period of the transducing signal that is used to sample.This sampling apparatus is characterised in that, for specific period is set in the sampling in the specific period (specific region) of the display image that forms on display element group and display driver circuit.Further, display image display digit key and the specific period corresponding with the key display position.
The single-sensor of this optical sensor group is included in the sensor circuit, and this sensor circuit comprises the electric capacity in parallel with optical sensor, to the input switch of electric capacity pre-charge pressure and to the output switch of signal wire output capacitance electromotive force.The pre-charge pressure circuit links to each other with signal wire, and electric capacity links to each other with this signal wire through switch.This pre-charge pressure circuit have the pre-charge pressure changeable device that can change the pre-charge pressure electromotive force (see Fig. 9, Figure 12 A, Figure 12 B, Figure 13).
The pre-charge pressure that is used for optical sensor is characterised in that, with a plurality of 2 dimensional regions variations (seeing Fig. 9,12A, 12B and 13) of optical sensor group.This interregional pre-charge pressure difference is used for remedying the sensitivity and the property difference of a plurality of optical sensors or a plurality of output amplifiers.
Further, in device of the present invention, transparent protective glass (or protective clear layer such as synthetic resin) is positioned at the top surface of optical sensor group and display element group.This device is characterised in that, if the optical sensor group is set to handwriting input, then uses most advanced and sophisticated pen (seeing Figure 11) with particular style.In this case, the zone of whole pattern is such, makes a plurality of optical sensors of this pattern covers, so that it is discerned.
Improve the improvement technology of reading speed
Improve according to this device of the present invention, the Image Acquisition signal can be read at short notice.For this purpose, if reading images is obtained signal, from multirow sensor circuit while or continuous reading electric charges.
Figure 15 A represents if reading electric charges in the sensor circuit from delegation, and how the voltage on the signal line changes.Read before this electric charge, this signal wire is charged to predetermined voltage Vpre.Then, as previously described, electric charge discharges from capacitor C P through thin film transistor (TFT) nt2 and nt3.Voltage VO1 represents that black output changes.Voltage VO2 represents that grey (equal the total tone of black and white half) output changes.Voltage VO3 represents that white output changes.On the contrary, Figure 15 B represents that observed output changes when exporting simultaneously on same signal line from the row of 10 in 10 sensor circuits electric charge.Voltage VO11 represents that black output changes.Voltage VO22 represents that grey (equal the total tone of black and white half) output changes.Voltage VO33 represents that white output changes.
In this case, 10 line outputs from a plurality of sensor circuits concentrate in together.Therefore, the relative Figure 15 A of time total amount from the initial detection up to output signal of the output of the output signal of sensor circuit group can reduce.In addition, if obtain Image Acquisition signal in the frame, may reduce the quantity of the output signal that will detect.This means can be reading images being obtained the time total amount that obtains abundance in the Signal Processing, to determine to obtain the content of image.
Figure 16 A and Figure 16 B represent to be used for reading simultaneously the electric charge from 10 row sensor circuit that is positioned on the signal line, then this electric charge are placed on this signal wire.Figure 16 B is the process flow diagram of this circuit operation of expression.Basically, this class of operation is similar to the operation of describing among Fig. 4 to Fig. 6.Circuit among Figure 16 A is except the arrangement of signal wire Sig (n) R, Sig (n) B, Sig (n) G, and is identical with the circuit shown in Fig. 6.Circuit among Figure 16 A is an example, and wherein electric charge reads and places on signal line Sig (n) B from capacitor C P.But, in fact, read 10 row electric charges simultaneously, and this electric charge placed on signal wire Sig (n) B from sensor circuit.Further, the figure shows signal line Sig (n) B.But, in fact, have large number of signal lines Sig (n) B.
When switching transistor 13a connected, signal wire Sig (n) B, Sig (n) G and Sig (n) R were used for vision signal is write corresponding capacitor C s.If vision signal has write capacitor C sk, then capacitor C sk drives liquid crystal LC.Image shows on the basis of the driving condition of a plurality of integrated liquid crystal LC.In this case, image is relevant with input pickup.For example, the image of display digit key or switch.
This glyph image is irrealizable by a pixel only.A whole set of a plurality of symbols form glyph image.Like this, the present invention notices this fact, and promptly this glyph image is suitable for obtaining by carry out each write operation on a plurality of pixels.Therefore, by on the pixel of multirow, carrying out each write operation vision signal is write.This figure only represents that a circuit has three display elements in the delegation.Yet, in fact, 10 row vision signals are write for example capacitor C sk of display element circuit (display element group) with time division way.
In addition, according to the present invention, read each processing of 10 row Image Acquisition signals and go up execution at for example sensor circuit (sensor circuit group).The operation of this sensor circuit will be described below.
Signal wire Sig (n) R be used for pre-charge pressure in the cycle to the capacitor C P pre-charge pressure of sensor circuit 1321 to predetermined potential.This figure only represents a sensor circuit in the delegation, but in fact, through the capacitor C P pre-charge pressure of signal wire Sig (n) R to 10 row sensor circuit (sensor circuit group).
Signal wire Sig (n) G is used for sending in the Image Acquisition cycle electric current of the photodiode PD that flows through.This electric current sends operation and can carry out by the electromotive force of suitable setting signal line Sig (n) G.When light is penetrated on photodiode PD, produce electric current corresponding to light quantity.Finally, the electromotive force of capacitor C P reduces.When output image obtained signal, signal wire Sig (n) B was used to amplify and read the voltage of capacitor C P.In the case, signal Sig (n) B pre-charge pressure is to for example 5 volts.Suppose that capacitor C P pre-charge pressure to 5 volt and this voltage do not reduce, the electromotive force of signal wire Sig (n) B remained unchanged in the output cycle (black output).If from 5 volts of decay, the electromotive force of signal wire Sig (n) B changes (shadow tone output or white output) to the voltage of the capacitor C P of pre-charge pressure in the output cycle.Read this electromotive force by analog to digital conversion circuit and data output circuit.
Figure 17 represents the aforesaid operations of each frame (N frame and N+1 frame).The content that Figure 17 represents and Fig. 5 are much at one.Yet, in this example, in 10 row, carry out each read operation.Finally, in a frame, read (1/10) TPF of required time of information and carry out 1/10th of the required time T PF of each read operation in delegation from the sensor circuit group.Like this, handling the sufficient time that from the detection signal that this sensor circuit obtains, can obtain.It is very important providing the sufficient time to this processing procedure.This is to need the sufficient time because the information that obtains from this sensor circuit group is carried out the various logic decision.Link to each other with writing of vision signal, for example the glyph image of numerical key or switch is irrealizable with a pixel only.The a plurality of symbols of one cover form glyph image.Therefore, the present invention notices this fact, and promptly this glyph image is suitable for obtaining by carry out each write operation on a plurality of pixels.Therefore, vision signal is write pixel in the multirow.Also handle the sufficient time that provides writing.If write vision signal, then for example write circuit (signal-line driving circuit and pre-charge pressure circuit 114) with time division way video in write cycle (shown in Figure 16 B and Figure 17 B) respectively to signal wire Sig (n) R, Sig (n) B, Sig (n) G output 10 row vision signal R, G, B.This signal-line driving circuit and pre-charge pressure circuit 114 comprise switch and operate the function that the signal wire electromotive force is set to appropriate value in order to finish these.The invention is not restricted to the foregoing description.
Figure 18 A and Figure 18 B represent an alternative embodiment of the invention.This embodiment is with the different of embodiment shown in Figure 16 A and Figure 16 B, and is follow-up and from this sensor circuit group for example reading images is obtained the method (output cycle) that the row of 10 the signal reads continuously.Especially, with time division way repeat from sensor circuit read 10 the row electric charges operation, the operation that repeats to measure electromotive force on this signal wire then.The remainder of this method is identical with the embodiment shown in Figure 16 A and Figure 16 B.Therefore, omit the description of this same section.
The operation of each frame (N frame and N+1 frame) shown in Figure 19 presentation graphs 18A.During each read operation, read 10 line outputs from sensor circuit.Therefore, reading (1/10) TPF of required time of information from this sensor circuit group and carry out 1/10th of the required time T PF of each read operation in delegation in a frame, is measuring operation after each read operation.Like this, handling the sufficient time that from the detection signal that this sensor circuit obtains, can obtain.
Figure 20 represents various examples, therefrom obtains 10 line outputs from this sensor circuit group.The figure shows when 10 row electric charges from sensor circuit output to same signal line continuously, how output changes.Voltage VO41 represents that black output changes.Voltage VO42 represents that grey (equal the total tone of black and white half) output changes.Voltage VO43 represents that white output changes.In this case, output is from the mean value of 10 line outputs of sensor.
Above-mentioned Image Acquisition signal is by the analog to digital conversion circuit digitizing.Then, through the final image capture data of data output circuit output.This image capture data is written into Writing/Reading and forbids processing section 312.Writing/Reading forbids that processing section 312 is written into this image capture data effectively.
Below the feature of the foregoing description will be described briefly.
Have the display element circuit bank according to this device of the present invention, comprise a plurality of display elements and the sensor circuit group of arranging with matrix form, this sensor circuit group comprises the optical sensor of arranging with matrix form.In this case, display driver circuit provides shows signal and provides drive signal to the line direction of display element circuit bank to the column direction of display element circuit bank.Read circuit the part in a specified level cycle of a frame has been defined a column direction and a plurality of line direction of optical sensor circuit group,, export as computing thereby read transducing signal from a plurality of optical sensors to discern one group of a plurality of optical sensor circuit.Reading signal processing apparatus handles the transducing signal that reads circuit output.
Further, read circuit and have the device that is used to control this sensor circuit group, so that the signal wire that this display element circuit bank of this computing export orientation is used.Perhaps, this reads circuit can have the device that is used to control this optical sensor group, exports as computing to read transducing signal simultaneously from a plurality of optical sensors in the part in specified level cycle of a frame.
Perhaps, this reads circuit can have the device that is used to control this optical sensor group, exports as the time-division to read transducing signal continuously from a plurality of optical sensors in the part in specified level cycle of a frame.
Perhaps, this reads circuit and can be included in from a plurality of optical sensors and read transducing signal is arranged on predetermined potential as the signal wire that will be written into this transducing signal before the computing output device.
Be not subjected to the amplifier characteristics differentia influence and obtain the innovative approach that stabilized image obtains output
As mentioned above, pixel and sensor (also can be described as the read/write pixel) part is made up of display pixel circuits 1311 and read sensor circuit 1312.To the device that be used for cancelling the amplifier element threshold value potential difference that constitutes this sensor circuit 1312 be described below.
Figure 21 represents to be used for the example of the basic circuit structure of read/write pixel.Cs is illustrated in the pressure-wire that predetermined potential is provided to the electrode of each auxiliary capacitor Csk and liquid crystal LC in the predetermined period.Gate (m) expression controllably turns on and off the gate line of thin film transistor (TFT) (TFT is hereinafter referred to as the driving transistors) 13a of image element circuit 1311.
In the figure, but image element circuit 1311 Show Colors.Promptly in the figure, image element circuit 1311 is made up of image element circuit 132R, 132G and 132B.Sig (n) R, Sig (n) G, Sig (n) B are illustrated in the signal wire of the horizontal level formation of image element circuit 132R, 132G, 132B separately.Signal wire Sig (n) R, Sig (n) G, Sig (n) B connect between signal-line driving circuit and pre-charge pressure circuit 114 and analog to digital conversion circuit.
As shown in Figure 3, display image data R, G, B offer corresponding signal lines through signal-line driving circuit and pre-charge pressure circuit 114.Then, when the gate lines G ate that will be positioned at the data presentation position (m) connects, view data R, G, B are write corresponding auxiliary capacitor Csk.This feasible liquid crystal LC corresponding to view data R, G, B is driven.
Further, CRT (m) expression controllably turns on and off the gate line (in this case, transistor nt1 plays difference and ends transistorized effect) of the thin film transistor (TFT) nt1 that constitutes sensor circuit 1312.OPT (m) expression controllably turns on and off the gate line (in this case, transistor nt3 plays the transistorized effect of I/O) of the thin film transistor (TFT) nt3 that constitutes sensor circuit 1312.
Pressure-wire CS is connected with demonstration gate line drive circuit 112 with gate lines G ate (m).Gate line CRT (m) with read gate line drive circuit 122 and be connected.
The Sensor section of reference number 133 expressions formation sensor circuit 1312.In this Sensor section, capacitor C p and photodiode PD form parallel circuit.An electrode of this Sensor section 133 be connected with the grid of thin film transistor (TFT) nt2 (transistor nt2 play amplifier transistor effect) in this case.Another electrode of this Sensor section 133 is connected with for example signal wire Sig (n) B.
Difference is ended transistor nt1 and is connected in series between an electrode of the electrode of amplifier transistor nt2 and Sensor section 133.The electrode of I/O transistor nt3 is connected with the electrode of amplifier transistor nt2.Another electrode of I/O transistor nt3 is connected with first signal wire Sig (n) R.Another electrode of amplifier transistor nt2 is connected with secondary signal line Sig (n) G.Another electrode of Sensor section 133 is connected with secondary signal line Sig (n) B.
If photodiode PD is by a large amount of rayed, sensor capacitance Cp discharges a large amount of electric currents.On the contrary, if photodiode PD by a spot of rayed, then sensor capacitance Cp discharges small amount of current.Light is blocked between photodiode PD and (not shown) backlight.Photodiode PD is not subjected to backlight the influence.
Signal-line driving circuit is connected with signal wire Sig (n) R, Sig (n) G, Sig (n) B with pre-charge pressure circuit 114.Signal-line driving circuit and pre-charge pressure circuit 114 also comprise and relate to voltage setting circuit 1140.Therefore signal-line driving circuit and pre-charge pressure circuit 114 electromotive force of switch signal line Sig (n) R, Sig (n) G, Sig (n) B controllably.In addition, the sequence control signal of response sequence generator 1141, signal-line driving circuit and pre-charge pressure circuit 114 can obtain the potential switch sequential.The sequence signal of sequencer 1141 is based on the control signal of demonstration and image capture data processing section 300.
Figure 22 is the sequential chart of the operation of remarked pixel circuit 1311 and sensor circuit 1312.
In the specified level cycle in a frame period, carry out view data is write image element circuit 132R, 132G, 132B, and obtain signal from sensor circuit 1312 reading images.For image element circuit (also can be described as the display element circuit) 1311, a horizontal cycle (1H) was divided into for first null cycle, common inversion timing cycle, write cycle time and second null cycle.Interrelate with these four cycles,, a horizontal cycle is divided into the output cycle, common inversion timing cycle, null cycle and pre-charge pressure and difference Abored Cycle for sensor circuit 1312.At a vertical cycle in the cycle in (frame period) rather than in the specific cycle, image element circuit 1311 is in the display cycle, and sensor circuit 1312 is in Image Acquisition in the cycle simultaneously.
In addition, especially, specifically describe the operation of sensor circuit 1312.
In the pre-charge pressure cycle of capacitor C p, first predetermined potential (for example 5 volts) is provided to first signal wire Sig (n) R.Zero potential offers the second and the 3rd signal wire Sig (n) G and Sig (n) B.Pass through first grid polar curve CRT (m) while or connect difference termination transistor nt1 continuously.Further, connect I/O transistor nt3 through second grid line OPT.Then, the difference Abored Cycle after pre-charge pressure is connected difference through first grid polar curve CRT (m) and is ended transistor nt1.Further, turn-off I/O transistor nt3 through second grid line OPT.
Then, at the difference Abored Cycle, the initial potential of capacitor C p is set to equate with the threshold value Vth of amplifier transistor nt2.Especially, when capacitor C p has high potential immediately after charging, connect transistor nt2 with the preliminary filling electric current.Electromotive force drops to the threshold value Vth of transistor nt2 then.At the difference Abored Cycle, the initial potential of capacitor C p is set to equate with the threshold value Vth of amplifier transistor nt2.
In this state, in the Image Acquisition cycle subsequently, turn-off difference through first grid polar curve CRT (m) and end transistor nt1.Further, turn-off I/O transistor nt3 through second grid line OPT (m).If (Image Acquisition cycle=(frame period)-(horizontal cycle) (specified level cycle)) in this state is for example from the reflected light irradiates light electric diode PD that touches finger, the further release current of sensor capacitance Cp.On the contrary, if there is not rayed photodiode PD, then forbid the further release current of sensor capacitance Cp.
In the read cycle, in the sampling of first signal wire Sig (n) R last execution first predetermined potential (5 volts).Secondary signal line Sig (n) R provide zero potential.The electromotive force of the 3rd signal wire Sig (n) B is about half of default maximum changing range of Sensor section 133, for example 0.5 volt.Yet this value can be adjusted according to TFT characteristic or stray capacitance.This value is lower than the maximum changing range of Sensor section.This value set to be equivalent to before reading to shift according to predetermined value through capacitor C p be input to amplifier transistor nt2.
Simultaneously, turn-off difference through first grid polar curve CRT (m) and end transistor nt1.Further, connect I/O transistor nt3 through second grid line OPT (m) I/O.Word " sampling " uses in specific device, and the signal wire of this device is connected to 5 volts of power leads, so that this signal wire electromotive force is made as 5 volts, then this signal wire is separated with 5 volts of power lead electricity.
Suppose that in the Image Acquisition cycle electromotive force of capacitor C p (5 volts) reduces according to 1 volt.Then, in the read cycle, the grid voltage of sampling transistor nt2 is (Vth-0.5V).For this electromotive force,, (1)+0.5=-0.5 is added to Vth because the 3rd signal wire Sig (n) B provides 0.5 volt variation.If capacitor C p is release current no longer, the grid voltage of amplifier transistor nt2 is (Vth+0.5V).
Like this, when the 3rd signal wire Sig (n) B provided aforesaid 0.5 volt, first signal wire Sig (n) R provided first predetermined potential (5V) (sampling), and secondary signal line Sig (n) G provides zero potential, if capacitor C p is release current no longer, then transistor nt2 connects.On the other hand, if the further release current of capacitor C p, then transistor nt2 continues to stay open.
As a result, whether release current changes the voltage of signal Sig (n) R according to capacitor C p really.That is to say, can avoid the adverse effect of the property difference among the transistor nt2, to obtain output from this sensor circuit reliably.
As mentioned above, at the difference Abored Cycle, the initial potential of this electric capacity is made as with the threshold value Vth of this amplifier transistor equates.Therefore, detect for light, whether whether the electromotive force that passes electric capacity changes can maintain threshold value Vth substantially or begin to reduce to determine from this value according to the electromotive force on the electric capacity.In the read cycle, carry out the detection of determining based on this.In this case, this device determines whether the predetermined potential of first signal wire Sig (n) R changes, and promptly whether this amplifier transistor keeps turn-offing or connecting.
Figure 23 is the process flow diagram of expression by the treatment step of sequencer 1142 execution, in order to carry out aforesaid operations, provides sequencer 1142 to be used for driver sensor circuit 1312 especially.Sequencer 1141 can combine with signal-line driving circuit and pre-charge pressure circuit 114, as shown in Figure 3, perhaps is provided in the time schedule controller 306, as shown in Figure 2.Step SA1 to SA3 is corresponding with foregoing pre-charge pressure and difference Abored Cycle.Step SA4 after the step SA3 is corresponding with the Image Acquisition cycle.Step SA5, SA6, SA7 after the step SA4 are corresponding with the above-mentioned read cycle.Whether change according to the predetermined potential of first signal wire Sig (n) R and to determine whether to have input.
Figure 24 represents the aforesaid operations (N frame and N+1 frame) of each frame.
Can improve the present invention, to obtain the Image Acquisition signal at short notice.Like this, according to the present invention, if reading images is obtained signal, then simultaneously or read the multirow electric charge continuously from sensor circuit.
For example, according to the present invention, go up each operation that the execution reading images is obtained signal in 10 row sensor circuit (sensor circuit group).The operation of this sensor circuit will be described below.
Figure 25 represents the aforesaid operations (N frame and N+1 frame) of each frame.Content and Figure 24 that Figure 25 represents are basic identical.But, in this example, on 10 row, carry out each read operation.Therefore, in a frame, read (1/10) TPF of required time of information and carry out 1/10th of the required time T PF of each read operation at a row from the sensor circuit group.Like this, handling the sufficient time that from the detection signal that this sensor circuit obtains, can obtain.It is very important providing the sufficient time to this processing procedure.This is because the various logic decision that the information that obtains from this sensor circuit group is carried out needs the sufficient time.By linking to each other with writing of vision signal, for example the glyph image of numerical key or switch is irrealizable by a pixel only.Therefore, the present invention notices this fact, and promptly this glyph image is suitable for obtaining by carry out each write operation on a plurality of pixels.Therefore, vision signal is write pixel in the multirow.Also handle the sufficient time that provides writing.If write vision signal, then for example write circuit (signal-line driving circuit and pre-charge pressure circuit 114) respectively to signal wire Sig (n) R, Sig (n) B, Sig (n) G is exported 10 row vision signal Rs, G, B at video in write cycle with time division way.This signal-line driving circuit and pre-charge pressure circuit 114 comprise switch and operate the function that the signal wire electromotive force is set to appropriate value in order to finish these.
The invention is not restricted to the foregoing description.In force, the present invention can not break away from essence of the present invention by changing the element among this embodiment and implements.Further, the appropriate combination of a plurality of elements that can disclose by the foregoing description forms various inventions.For example, some in all elements shown in this embodiment can be ignored.In addition, but the element appropriate combination of from different embodiment, selecting together.Therefore, fall within the scope of the present invention by the structure that above-mentioned a plurality of embodiment combinations are obtained.
Other superiority and modification are apparent to those skilled in the art.Therefore, the more wide in range aspect of the present invention is not limited to here specific details and described embodiment.Therefore, can carry out various modifications and do not depart from by additional claim and describe the purport or the scope of defined total principle on an equal basis.
Claims (20)
1. a liquid crystal indicator that comprises input pickup is characterized in that, comprising:
One group with matrix form arranging pixel circuits (1311);
One group of sensor circuit (1312) of arranging with matrix form;
Display driver circuit (112,114) provides shows signal and provides drive signal to every row of display element group to every row of display element group;
Read circuit (122,123,124), defined the row and column of optical sensor circuit group, be used for reading transducing signal from this optical sensor to discern an optical sensor;
Read signal processing (300), carry out the instruction of using, handle the transducing signal that reads circuit output according to request;
Order register (304) is arranged on and reads in the signal processing;
Interface portion (302) is arranged on and reads in the signal processing, when the instruction of request execution application is sent to interface portion, this instruction is sent to this register (304).
2. according to the described liquid crystal indicator that comprises input pickup of claim 1, it is characterized in that, read signal processing and comprise the device (307) that is used to generate based on the view data of this transducing signal.
3. according to the described liquid crystal indicator that comprises input pickup of claim 1, it is characterized in that, read signal processing and comprise the device (307) that is used on this optical sensor, generating corresponding to the coordinate data of transducing signal.
4. according to the described liquid crystal indicator that comprises input pickup of claim 1, it is characterized in that, read signal processing and comprise that generation also feeds back to this view data the device (307,306) of display driver circuit corresponding to the view data of transducing signal.
5. according to the described liquid crystal indicator that comprises input pickup of claim 1, it is characterized in that this display driver circuit comprises:
Demonstration gate line drive circuit (112) to every line output drive signal of image element circuit group; With
Export the signal-line driving circuit and the pre-charge pressure circuit (114) of shows signal to every row of image element circuit group.
6. according to the described liquid crystal indicator that comprises input pickup of claim 1, it is characterized in that, signal wire is connected with auxiliary capacitor along the image element circuit of this signal wire setting, and be connected with optical sensor circuit along this signal wire setting by switch, wherein shows signal outputs to described signal wire, and
This signal wire also is used to make signal-line driving circuit and pre-charge pressure circuit (114) to the capacitor pre-charge pressure in parallel with each optical sensor circuit.
7. according to the described liquid crystal indicator that comprises input pickup of claim 1, it is characterized in that,
Read circuit (122,123,124,1140,1141) be an alignment and a plurality of line of the part definition optical sensor circuit group in a specified level cycle in the frame, thereby read transducing signal to discern one group of a plurality of optical sensor circuit, export as computing from a plurality of optical sensors; With
Read signal processing (300), be used to handle the transducing signal that reads circuit output.
8. according to the described liquid crystal indicator that comprises input pickup of claim 7, it is characterized in that, read circuit and have the device that is used to control the sensor circuit group, make the signal wire that this computing export orientation is used by the display element circuit bank.
9. according to the described liquid crystal indicator that comprises input pickup of claim 7, it is characterized in that, read circuit and have the device that is used to control the optical sensor group, make in the part in specified level cycle of a frame, read transducing signal simultaneously from a plurality of optical sensors and export as computing.
10. according to the described liquid crystal indicator that comprises input pickup of claim 7, it is characterized in that, read circuit and have the device that is used to control this optical sensor group, make in the part in specified level cycle of a frame, read transducing signal continuously from a plurality of optical sensors and export as the time-division.
11. according to the described liquid crystal indicator that comprises input pickup of claim 7, it is characterized in that, read circuit and be included in from a plurality of optical sensors and read transducing signal, on predetermined potential, be provided as the device of the signal wire of line as before the computing output.
12. according to the described liquid crystal indicator that comprises input pickup of claim 1, it is characterized in that, further comprise:
Amplifier (nt2) is used for amplifying the signal from the image element circuit optical sensor;
This optical sensor links to each other with the input of this amplifier;
The input voltage of each amplifier is made as the device (nt1, nt3, CRT (m), OPT (m), 1140,1141) of an operational threshold of this amplifier; With
Be used for before amplifier output signal, the input voltage of amplifier being changed the device (nt1, nt3, CRT (m), OPT (m), 1140,1141) of predetermined value.
13. according to the described liquid crystal indicator that comprises input pickup of claim 12, it is characterized in that, predetermined value be made as signal excursion less than optical sensor.
14., it is characterized in that each sensor circuit comprises according to the described liquid crystal indicator that comprises input pickup of claim 1:
Sensor section (133), wherein capacitor and photodiode constitute parallel circuit;
Amplifier transistor (nt2) has a grid that electrode links to each other with this Sensor section;
Difference is eliminated transistor (nt1), connects between an electrode of an electrode of this amplifier transistor and this Sensor section;
I/O transistor (nt3) has an electrode that links to each other with an electrode of this amplifier transistor;
First signal wire that links to each other with transistorized another electrode of I/O (Sig (n) R);
The secondary signal line that links to each other with another electrode of amplifier transistor (Sig (n) G);
The 3rd signal wire that links to each other with another electrode of Sensor section (Sig (n) B);
Eliminate the first grid polar curve (CRT (m)) that transistorized control grid links to each other with difference;
The second grid line (OPT (m)) that links to each other with the transistorized control grid of I/O;
Be used for pre-charge pressure at capacitor in the cycle, at the device (114 that no-voltage is provided to the second and the 3rd signal wire when first signal wire provides first predetermined potential, 1140,1141), eliminate transistor so that connect difference, connect the I/O transistor by the second grid line simultaneously by the second grid line;
Be used at pre-charge pressure in the difference elimination cycle after the cycle, connect difference by first grid polar curve and eliminate transistor, turn-off the transistorized device of I/O (114,1140,1141) by the second grid line simultaneously;
Be used in Image Acquisition in the cycle, turn-off difference by first grid polar curve and eliminate transistor, turn-off the transistorized device of I/O (114,1140,1141) by the second grid line simultaneously;
Be used in read cycle, first predetermined potential is provided, simultaneously no-voltage is provided, the device of electromotive force is provided to the 3rd signal wire to first signal wire to the secondary signal line, this electromotive force is about half of the default maximum changing range of Sensor section, eliminate transistor so that turn-off difference, connect the I/O transistor by the second grid line simultaneously by first signal wire.
15. according to the described liquid crystal indicator that comprises input pickup of claim 14, it is characterized in that, further comprise the device that is used for reading the potential change of first signal wire at read cycle.
16. according to the described liquid crystal indicator that comprises input pickup of claim 15, it is characterized in that, this first, second be connected with red (R) image element circuit, green (G) image element circuit, indigo plant (B) image element circuit accordingly with the 3rd signal wire, with the input shows signal.
17. method that is used to drive liquid crystal indicator, this liquid crystal indicator has one group with the matrix form arranging pixel circuits, one group of sensor circuit of arranging with matrix form, shows signal is provided and the display driver circuit of drive signal is provided to every capable display element group to every row display element group, defined the optical sensor circuit group row and column read circuit, be used for reading transducing signal to discern an optical sensor from this optical sensor, and the instruction of carrying out application according to request, be used to handle the signal processing that reads of the transducing signal that reads circuit output, this method comprises:
For the image element circuit on scan line of image element circuit group,
The preceding semiperiod that is a horizontal cycle set for first null cycle;
After this first null cycle, set video write cycle;
Set for second null cycle after write cycle at this video;
After this second null cycle and before the horizontal cycle arrival of access next frame, set the display cycle; And
For the optical sensor circuit on scan line of optical sensor circuit group,
To be set at read cycle corresponding to the cycle of this first null cycle;
This video is set at a null cycle write cycle;
To be set at the pre-charge pressure cycle corresponding to the cycle of this second null cycle;
At this read cycle and this pre-charge pressure be set a null cycle between the cycle;
After cycle and before the horizontal cycle arrival of access next frame be set at this pre-charge pressure an Image Acquisition cycle.
18. according to the described method that is used to drive the liquid crystal indicator that comprises input pickup of claim 17, it is characterized in that, further comprise the steps:
Be the part in a specified level cycle in the frame, an alignment and a plurality of line of definition optical sensor circuit group so that discern one group of a plurality of optical sensor circuit, are used for reading transducing signal from these a plurality of optical sensors, export as computing; With
Utilize signal processing circuit, handle the transducing signal that reads circuit output.
19. according to the described method that is used to drive the liquid crystal indicator that comprises input pickup of claim 18, it is characterized in that, further comprise the steps: on predetermined potential, to be set to the signal wire of alignment reading transducing signal from a plurality of optical sensors as before the computing output.
20. according to the described method that is used to drive the liquid crystal indicator that comprises input pickup of claim 17, it is characterized in that, sensor circuit has Sensor section, wherein capacitor and photodiode constitute parallel circuit, amplifier transistor, have a grid that electrode links to each other with Sensor section, difference is eliminated transistor, connects between an electrode of electrode of amplifier transistor and Sensor section; The I/O transistor, has an electrode that links to each other with an electrode of amplifier transistor, first signal wire that links to each other with transistorized another electrode of I/O, the secondary signal line that links to each other with another electrode of amplifier transistor, the 3rd signal wire that links to each other with another electrode of Sensor section, eliminate the first grid polar curve that transistorized control grid links to each other with difference, and the second grid line that links to each other with the transistorized control grid of I/O, this driving method comprises:
, first predetermined potential is provided, provides no-voltage to the second and the 3rd signal wire simultaneously in the cycle at the pre-charge pressure of electric capacity, eliminate transistor, connect the I/O transistor by the second grid line simultaneously so that connect difference by the second grid line to first signal wire;
, connect difference by first grid polar curve and eliminate transistor in the difference elimination cycle after the cycle at pre-charge pressure, turn-off the I/O transistor by the second grid line simultaneously;
, turn-off difference by first grid polar curve and eliminate transistor in the cycle in Image Acquisition, turn-off the I/O transistor by the second grid line simultaneously;
In read cycle, first predetermined potential is provided, no-voltage is provided, provides electromotive force to the secondary signal line simultaneously to first signal wire to the 3rd signal wire, this electromotive force is about half of the default maximum changing range of Sensor section, eliminate transistor so that turn-off difference, connect the I/O transistor by the second grid line simultaneously by first grid polar curve.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004096829A JP2005284661A (en) | 2004-03-29 | 2004-03-29 | Display device with built-in input sensor, and its driving method |
| JP2004096829 | 2004-03-29 | ||
| JP2004144950 | 2004-05-14 | ||
| JP2004144951 | 2004-05-14 |
Publications (2)
| Publication Number | Publication Date |
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| CN100416480C true CN100416480C (en) | 2008-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100817494A Active CN100416480C (en) | 2004-03-29 | 2005-03-29 | Input sensor containing display device and method for driving the same |
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| Country | Link |
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| JP (1) | JP2005284661A (en) |
| CN (1) | CN100416480C (en) |
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| Publication number | Publication date |
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| JP2005284661A (en) | 2005-10-13 |
| CN1700270A (en) | 2005-11-23 |
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