TW200951933A - Pixel circuit, display device having pixel circuit, and method of operating pixel circuit - Google Patents

Abstract

A pixel circuit for a display device is formed on a transparent isolation substrate and includes a sensing pixel circuit for light sensing. To conduct a sensing operation, a control line is formed in red, green and blue pixel areas so that a reduction of an aperture ratio is reduced. The pixel circuit includes a capacitor, a phtodetector, and a discharging area. The photodetector is in response to signals of the control line, so that when a forward bias is supplied, the capacitor is charged by a first voltage; when are verse bias is supplied, a first discharge is performed on the first voltage charged in the capacitor during integration. After the integration, in the discharging area a second discharge is performed on a first pre-charged data line voltage by a pre-charged voltage and a first sampling voltage is transmitted to an output node. After the second discharge, a third discharge is performed on a second pre-charge data line voltage by the pre-charged voltage and a second sample voltage is transmitted to the output node.

Description

200951933 UJopif.doc VI. Description of the Invention: [Technical Field] The present invention relates to a pixel drcuit, and more particularly to a pixel circuit capable of performing display and sensing functions, having a pixel A display device of a circuit and a method of operating a pixel circuit. [Prior Art] Recently, as the demand for portable electronic products has increased, efforts to make portable electronic products have diverse functions other than displays are underway. Among them, research using a photodetector to sense the surrounding light or the light of the display itself to carry out diversified functions is underway. The display of the display that uses the photodetector to implement various functions includes a peripheral light sensing circuit, a touch panel circuit, and an optical scanner. The ambient light reduction J channel controls the brightness of the device by sensing the light around the display. The touch panel circuit utilizes the light surrounding the display or the light of the display j to sense the portion covered by the hand. The light scanner will display; the light of the TM itself is sensed by the reflected light reflected by the document. In a photodetector, the optical signal that converts the received optical signal into a telecommunication signal is a photodetector that is a light-like diode. Recently, research and development of technologies for performing touch panel, or image scanner, or stylus function are being carried out on a glass substrate using a photodetector 2 instead of using another diaphragm. processing. Since the touch detector or the scanning function is realized by sensing the intensity of the light by the photodetector, it should be integrated with the display. However, the sensing circuit including the photodetector and the display's elementary integration 200951933 " together, will cause the aperture ratio of the display pixel to decrease. Figure 1 is currently used in active matrix liquid crystal display (Active Matrix) Liquid Crystal Display, AMLCD) The circuit diagram of the pixel structure. Referring to Figure 1, the pixel contains the LCD pixel and the sensing pixel circuit. The LCD element contains the transistor 1^ (or tg, τΒ) and the capacitor CsR (or CsG). ' CsB 〇 〇 昼 昼 包含 包含 包含 包含 包含 包含 包含 包含 包含 昼 昼 昼 昼 昼 昼

Transistor'TFT) T1, p-i-n (p-intrinsic-n) diode and capacitor cST. ◎ The sensing pixel circuit uses a data driving signal line as a read signal line and has a structure including two control signal lines of RST and RWS. The reset operation is performed by the forward bias characteristic of the ρ·ί_η diode and the selection operation is performed by the coupling effect of the RWS control signal line and the capacitor cST. Therefore, it has two deletions. The structure of a thin film transistor TFT. 'However, the aperture ratio of the thin film transistor TFT due to the reduction of the thin film transistor TFT is lower than that of the control signal line which is connected to the control signal line The reduction is greater, and the P-type (type) and N-type (type) processes are required for the manufacture of the ® P-1-n diode, which leads to an increase in process cost. SUMMARY OF THE INVENTION Therefore, the first aspect of the present invention is to provide a pixel circuit which can reduce a reduction in aperture ratio when used in a pixel circuit capable of performing display and sensing functions. Also, a second aspect of the present invention is to provide a display device including the halogen circuit. ’ 5 200951933^

D lu^upii.uOC method further 'the third aspect of the present invention is to provide the pixel circuit history operation. The first aspect of the present invention provides a pixel circuit having a library circuit, and the sensing pixel circuit includes Capacitor, photodetector ^ and = minefield. The photodetector responds to the signal of the control line, and when the forward bias is applied, the capacitor is charged by the voltage of 21, and when the reverse bias is applied, the first electrical calendar that has been charged in the capacitor is performed in the middle. A discharge. Second = after the integration period, the first pre-charge-area line voltage is discharged by the pre-charge voltage, and the first-sampling voltage is supplied to the point, and after the second discharge is performed, the pre-charge voltage is used. 3, the third discharge is performed, and the second sampling is performed = the printed dots are output. The pixel circuit can detect the difference between the first and the sampled voltages, and thus the sensing operation can be performed. The discharge zone is in the == 2 ^ voltage of the transmissive transfer _ 2 ^ voltage for the first _ 布 现 现 现 现 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至 至. The discharge region may include a first transistor and a first plaque-transistor having a first electrode connected to the Sweep, a control electrode connected to the IGBT, and a second transistor having a phase electrode, a slave electrode, and a scan _ Connect the control H point and the second electrode of the line _. In addition, 200951933 ^ i ujopif.doc The discharge region may also include a first transistor and a second transistor; the first transistor, when performing the second discharge and the third discharge, serves as a source immersor (s〇urce follower And operating; a second transistor that performs a switching operation in response to a scan line signal transmitted through the scan line. The first transistor and the second transistor may be P-type thin film transistor TFTs of Low Tempetatute Poly-Si (LTPS). The photodetector may be a pim (p_intrinsic-metal) diode which, when reverse biased, generates a photo leakage current corresponding to the intensity of the external light, and the first voltage charged in the capacitor during the integration period. The first discharge is performed inside. The halogen circuit may include a unit-pixel composed of red halogen, green halogen, and blue halogen. Moreover, the halogen circuit may also include a red halogen, or a color pixel or a blue halogen (sub_pixel). The pixel circuit may further include a pixel coupled to the data line and the scan line and responsive to the image signal transmitted through the data line to perform a display operation by the light emitting element. The halogen element can be an active matrix liquid crystal display AMLCD element, and the capacitor can be electrically coupled to a common power supply voltage, and the common power supply voltage is electrically lighter than the active liquid crystal display of the active matrix liquid crystal display ||AMLCD. The halogen can be an organic light-emitting diode (Organic Light Emitting Diode OLED), and the capacitor can be electrically coupled to the power voltage line, and the power voltage line is supplied to the power supply voltage to the organic light-emitting diode qled昼Prime. In addition, the pictograms that are connected to the sweeping line of the disciplinary (four) natural number can carry the illuminating operation, and the sensing circuit of the first scanning _ can be used to perform sensing. In addition, one of the points provided by this point of view provides a display of the shock, which is more 200951933

Jiu^opu.doc. Engaged in the second line's transmission scan line signal; data line, its transmission image times: green. Tian drive area, its control scan line; data drive area, its drive two pumping: wide and data drive area, It is electrically connected to the scan line and the data line. The sensing pixel circuit further includes: a capacitor, a wire 懕=, an electric zone. The photodetector responds to the signal of the control line, and when the forward bias I* charges the capacitor 11 with the first voltage, when reverse biased, the first voltage charged in the capacitor is first After the integration period, the first pre-feed line voltage is subjected to a second discharge with a pre-charge voltage, and the first-sampling voltage is supplied to the second-order point _', and the second discharge is performed, The charging voltage will be supplied to the 2nd and 2nd wires. • The third discharge will be performed, and the second sampling voltage will be taken as the _ point. The pixel circuit can detect the difference between the first sampled voltage and the second incoming pulse, and thus the sensing operation can be performed. The pixel circuit can be connected to the singular element and the timing control area; the pixel and the data line and the scanning line light element are responsive to the image signal transmitted through the data line, and the illuminating element area is slightly processed; the timing control area is scanned. The drive area and the data drive are thicker. The third aspect of the present invention provides a sensory circuit including a scan line and a sway line. The Wei method includes the following steps (2) in sensing the morpheme. The circuit 'and the control line electric secret side light, (^ two control line signal n voltage, charge the capacitor; (^ sense the light detector of the pixel circuit, the first product of the capacitor has been charged Eight & in the integration period _ to perform the first discharge; (6) in the sensing pixel circuit, 'after the knife' to pre-charge the voltage, the first pre-charged data line 200951933 voltage is second discharged, providing the first Sampling voltage; (d) after sensing the pixel circuit, performing a second discharge, performing a third discharge on the precharged data line voltage with a precharge voltage, and providing a second sample voltage; (6) feeling Measuring the halogen circuit 'by measuring the first sample voltage and the first The difference between the two sampled voltages is performed, and the sensing operation is performed. (c) After the sensing of the pixel circuit, after the product I, the pre-charged voltage is used to 'the first pre-charged data line-> The step of providing the second-sampling voltage to provide the first-sampling voltage is, after the integration period @, the first pre-charging of the data line with the pre-charging voltage ', in response to the scanning line signal transmitted through the scanning line, the first The pre-charged data line voltage is subjected to a second discharge to the scan line, and the first sampled electric J 2 (6) money pixel circuit can be provided, and after the first discharge: the precharged data line is precharged. The electric discharge is repeatedly subjected to the third discharge, and after the second discharge is provided, the data line voltage of the precharged electric charge 2 is charged, and the light of the first-character circuit in the +5 ❹ capacitor is charged. Exempted light leakage current will flow through the corresponding external light] charging, in the integration period, the 7 operation method can be included in the step _, ^ discharge. Alizarin electro-pixels ~ ~: =: 3⁄4 200951933 3iU35pit.doc The pixel circuit can perform sensing operations. According to the sensing pixel circuit provided by the present invention, in order to sense 1, the 'control line is formed in the red halogen, the green halogen and the color pixel region', and the two control signals are currently used. Sense of the line: Compared with the circuit, the aperture ratio can be reduced. ', In addition, the transistor of the sensing circuit is implemented by p-type thin film 曰 TFT and will sense 昼Since the photodetector of the prime circuit has been implemented, it can reduce the cost of the process. In addition, since the pixel circuit includes a sensing path for light sensing, it can provide an additional image of the scanner and/or the touch panel. Function. [Embodiment] The change of the embodiment (10) may also be implemented by the embodiment of the present invention. The invention is limited to the exemplary embodiments described herein, and the following are all the variations of the spirit and the scope of the invention, equivalents, = ί盖= In the similar 4 #罝第"7 second-class terminology' can be used to illustrate a number of different uses, and the purpose of use is to use a language. Wai, the first possible covering unit can be named after the application of the patent, but it can also be named as the first - may cover the early '兀苐 two language containing a number of similarly recorded units of i ° and / or, , Street, or most of the similarly recorded ❹ 519 200951933 opif.doc any unit in the unit. Where the unit can be covered, or “translated”, it should be understood that it may be connected to the lion and connected or _, or it may be stored. ^^ Covering the unit turning (4) fresh d connection, or f or 2 can be understood as the forest in the towel component. / Directly connected, the terminology used in the specification is used for the purpose of illustration only and is not intended to limit the invention. Unless the upper ground is only applied, the formula also contains most forms. Further, it is to be understood that in the terms of the present invention, it is indicated that there are a plurality of steps, operations, components, components, or groups of elements recited in the present invention, excluding: one or more other features or integers; -, = 70 rows, components, or a combination of the above. Shoulder work, and the section of the mouth) have her skills ^ have the meaning of the invention. It is more important to know the term (example = containing the meaning of n Γ and phase _ the context of the package = meaning - meaning, and should not be interpreted in terms of idealization or too formal meaning 'unless specifically defined here. Refer to the series of corrections _, in detail, the Japanese forest hair is also an example. In order to make the invention clearly understandable, do not test ', have the same reference numerals in the same line to show the same number of drawings, the plane Γ / dry is; A circuit diagram of a device I-circuit having an image scanning function according to the embodiment of the present invention is a block diagram of a flat display device according to an embodiment of the present invention. 18' In accordance with a first embodiment of the present invention, a flat display device having an image scanning function includes a scan driving area 200, a data driving area 3()' timing control area 400, and a pixel area 5. The timing control area 400 is A scan control signal is generated, and the scan driving area 200' is controlled and the data is controlled by generating a data control signal. The scan driving area 200 has a plurality of scan line signals (scan 1, . . . scan N) ( At least one of the majority of scan lines The scan line will be selected) and a plurality of control signals (REF 1 '..., REFN) (which control the sensing operation) are provided to the pixel area 500. The tributary drive area 300 is transmitted through a plurality of data lines (data 1, data 2 '"""^1&]^-1, (1&1&]^) provides the image signal to the pixel area 5. The pixel area 500 includes a plurality of pixel circuits 100. Figure 2 is in accordance with In the flat display device having the image scanning function according to the first embodiment of the present invention, one of the pixel circuits constituting the planar display device when the active matrix liquid crystal display AMLCD is used is specifically drawn. Referring to FIG. 2' The pixel circuit 1A of the planar display device having the image scanning function according to the first embodiment of the present invention includes the sensing pixel circuit 10 and the LCD pixel. The sensing pixel circuit 1〇 and 1^1) pixels 2〇 can be formed on the same transparent insulating substrate. 'The LCD element 20 includes a transistor P1, a capacitor (^, and a liquid crystal cell) ^. The sensing pixel circuit 1 includes a photodetector 12, a capacitor Cst, and Discharge 12 200951933 jiujopif.doc Area 14. As shown in Figure 2, the discharge area μ can be Contains two thin film transistors tft P2 > P3 〇 In order to perform a read operation, transistor P2 operates as a source follower. Transistor P2 operates as a polar follower, pre-charging data The line voltage is discharged to the scan line. The gate of the transistor P3 is coupled to the scan line, and the drain and the data line are coupled to each other. Therefore, according to the scan line signal, it is used as a switch for selecting the scan line. ) and operate. The photodetector 12 can be a diode d. = The process cost is reduced, and the two thin film transistor TFTs p2 of the LCD and the two crystal transistor TFTs can be implemented using a p crystal TFT. Here, the transistor? 2. p3 can also be implemented using a low-profile thin film transistor TFT. Further, in order to reduce the sensory pixel circuit, the P-i_m diode piU line can be used to read the signal line, and 1 crystal 2 is used as the source line. The discharge path of the 乍 is not another data signal line, but the scanning use of the 'sweeping operation is not only the control line for selecting the line, but also the discharge path for the horse. The plane is an operation concept diagram of the circuit of the image-scanning function of the embodiment of the invention, and FIG. 4 is a diagram of the function of the circuit according to the present invention: the planar display device of the function 13 200951933 31036pif. According to the first embodiment of the present invention, when the pixel circuit is operated in the display mode, in order to prevent short-circuiting (sh〇rt) between the trace and the data line, the control signal is maintained at a high level, and the transistor is Μ maintained state. H) In the sensing mode, the flat display device according to the first embodiment of the present invention performs an image scanning operation. The light incident from the back side is reflected by the document placed on the surface of the LCD, and the intensity of the reflected light is determined by the gray level of the image on the document. The sensing pixel circuit 1〇 detects the intensity of the reflected light. Therefore, the panel of the flat display device according to the first embodiment of the present invention can perform not only a display operation by light emission but also a sensing operation for detecting reflected light. Referring to FIG. 3 'odd line (Nth, N+2, ...), the pixel performs the lighting operation, and the even line (the first line, the N+3, ...) pixel performs the sensing operation. . In the even line pixels, in addition to the scan time and the read operation during the scan, an integration operation is performed in a frame time. Next, an operation method of a pixel circuit according to a first embodiment of the present invention will be described with reference to Figs. 2 and 4. . First, during the initial reset period (reset-period), if the control signal REF becomes high'' (VREFhigh), the polar body D will become a forward biased state, and because the node N1 is \^ If the young -\^0]^^1„ is charged, the transistor P2 will turn off-off. In more detail, a forward bias is applied to a diode D to VREF. , high_v〇Np_i m charges the node N1i voltage (ie, the hidden voltage of the pim diode D, or the gate voltage VG, P2 of the transistor) (refer to the period T2), and, 14 200951933 ji uibpif. Doc ^^,^-,. ton refers to the voltage stored in the capacitor ^ ^ 卩 瓜 + meridian D D forward bias characteristics, perform self-reset (self_reset) operation, and, by the control signal REF The period of "high" is controlled so that the time of the integration period described below can be controlled. The reset action is performed by utilizing the forward bias characteristic of the pim diode D, so that no other thin film electric corona is required. The body TFT, that is, the p_[_m diode d is performing its own reset operation using its forward bias characteristic'. In the integration period (integrati〇n peri〇(j, T3), if the control signal REF becomes "1〇w,, (vqing.w), the pim diode D becomes a reverse bias state, The reverse voltage will become v REF'high-VoRpwVREj^w. During the integration period, the light leakage current will flow through the p. m-polar body D by externally incident light or reflected light from an object on the LCD panel. And the light leakage current increases with the intensity of the incident light. With the light leakage current, the voltage stored to Cst begins to discharge. After the set integration time, at the end of the integration period, by When the voltage of the light leakage current is ΔΥ, the gate of the transistor P2 is Vref plus gh-V0N, p+m_AV. The voltage Δγ of the discharge is the integration time, CSL, light; the magnitude of the leakage current (or incidence) According to the intensity of the light, at this time, the data line of the role of the second phase line is pre-charged by the voltage VPRE by the pre-charge signal PRE. ^^ 'In the sampling period (sampling period, or Readout period) = in the sampling period (period T4), if the scan signal becomes "I〇w The second is two two rotten body will be turned on (turiM) n) 'is selected so that the sensing element sensing circuit day, a brother set sampling operations (refer to period T5). Pre-charging with V service 15 200951933 31036pif.doc The line voltage is discharged to the "low, level scan line by the source follower p2. The first discharge data line voltage (first The sub-sampled V0UT) is higher than the threshold voltage of the transistor P2 by VREF, high-V〇N, pi-m4VWth P2. Further, the precharge signal PRE of the "high" level is used. Once again, the data line is pre-charged, and in the second sampling period of the sampling period (period T5), the control signal REF will become "high,", so the gate of VREFhigh_v 〇Ν, ρ+π^^ transistor Ρ2 The pole node is charged. If the precharged PRE signal becomes "high", the readoff operation is performed with the second reset voltage by the source follower P2', and the data line voltage of the second discharge (the second sample of the ν〇) Υτ) As described above, the sampled voltage after two sampling operations is transferred to the Correlated Double Sampling (CDS) circuit. The correlated double-sampling CDS circuit obtains the difference between the data line voltage of the second discharge (VOUT of the second sample) and the data line voltage of the first discharge (VOUT of the first sample). Therefore, the final output processed in the correlated double sampling CDS circuit is AV, and as a result, the non-uniform critical voltage characteristics of the source follower p2 are eliminated, so that only Δν can be obtained. That is, the final output processed in the associated double-sampling CDS circuit is independent of the threshold voltage of the source follower 卩2, and the magnitude of the integration time, CST, and light leakage current (or the brightness of the incident light) And set. A flat display device with image scanning function according to the first embodiment of the present invention can be formed in a red halogen, or a green halogen or a blue halogen (10) vpixel). Or may be formed in each unit consisting of red 昼16 200951933 j upif.doc, green pixel and blue pixel 昼平二mr丨1: the thousand-dimensional display device of the financial image scanning function of the embodiment A sensing pixel circuit formed in a unit-pixel circuit diagram and FIG. 6 is one of the pixel circuits of FIG. 5, referring to FIG. 5, the pixel circuit 1()〇 may include red halogen, green μ , Ϊ color measurement of the halogen circuit. The sensing pixel circuit is formed by a unit consisting of: a color pixel, a 4-color element, and a blue element ((

It comprises two thin film transistors TFTP2_, one shape, one pole D, and a capacitance state 1st 0 as shown in FIG. 6 'Because the crucible 100 according to the first embodiment of the present invention contains only - strips formed in red halogen The control line REF ' of the green halogen and M color region is thus compared with the condition of the two control lines currently used (refer to FIG. 1), and the aperture ratio of the halogen can be increased. That is to say, compared with the structure of the currently used sensing pixel circuit (see FIG. 1), the sensing pixel circuit of the first embodiment of the present invention has a thin film transistor TFT, but since it is used only A ΜΙ?, compared with the current situation of using two control lines (refer to Figure 1), the problem of reducing the aperture ratio can be improved. Fig. 7 is a circuit diagram of a pixel circuit for a flat display device according to another embodiment of the present invention. Fig. 7 is a view showing one of NxM elements in a pixel region of a flat display device when the organic light-emitting diode OLED is used as a flat display device according to another embodiment of the present invention. Referring to FIG. 7, a pixel circuit 500 of a flat display device according to another embodiment of the present invention includes a sensing pixel circuit 510, a red OLED element 520, a green 〇 LED element 530, and a blue 17 200951933 31036 pit. doc color OLED 昼540. Fig. 7 is a circuit diagram of a sensing pixel circuit formed in each unit-pixel. A sensing pixel circuit can also be formed on each sub-pixel. The sensing pixel circuit 510 and the red OLED element 520, the green OLED element 530, and the blue OLED element 540 may be formed together on the same transparent insulating substrate. Each of the OLED elements 520, 530, 540 includes three transistors, a capacitor CS2, and an OLED memory unit. The transistors of the respective OLED elements 520, 530, and 540 can be implemented using a P-type thin film transistor TFT. The sensing pixel circuit 510 includes a photodetector 512, a capacitor C21, and a discharge region 514. As shown in FIG. 7, the discharge region 514 may include two thin film transistors TFTs P2, P3. In order to reduce the process cost, the two thin film transistors TFTP22, P23 of the OLED pixel and the sensing pixel circuit 510 can be implemented using a p-type thin film transistor TFT. Here, P2 and P3 can be implemented using a p-type thin film transistor TFT of a low temperature polysilicon. Also, in order to reduce the process cost, the diode D of the sensed pixel circuit 510 can be implemented using a p-i-m diode. In order to be able to conform to the OLED pixel structure, the sensing pixel circuit 51 is formed by changing the structure of the sensing pixel circuit 1 of FIG. Except that one end of the capacitor Cst is coupled to the power supply line ELVDD, it has the same structure as the sensing pixel circuit 10 of Fig. 2, and thus detailed description is omitted here. The sensing pixel circuit 510 in accordance with other embodiments of the present invention uses only one control signal line REF, thus minimizing the problem of reduced aperture ratio compared to the 200951933 31036 pif.doc condition using more than two control signal lines. Figure 8 Figure 1 2 3 4 5 6 7 display and sense of operation of the circuit. Figure 9 is a conceptual diagram of the operation of the pixel circuit of Figure 7. In the order of the month, when the display mode is operated as '']/color element, the first scan line signal will change. Therefore, when the controller becomes "high", the switch transistor is turned on. Tm charges the hth 111 through the data line at a voltage corresponding to the image signal. Then, if the Nth scan line signal becomes disconnected: it becomes H' switch transistor ^The voltage will be turned off and the A will turn on' and the charged capacitor CM will be transferred to the gate of the drive transistor Τπ Therefore, the current corresponding to the voltage transmitted to the gate will flow from the bottom of the driving t crystal & to the source, and the current flowing in the same direction as the current flowing in the transistor will be 19 1 The light-emitting diode OLED is turned on, so the intensity corresponding to the intensity of the 舆 current starts to emit. 3 When the state of the control signal em2 is “high”, the switching transistor T3r will be 4, and therefore, the current will not flow through the organic light emitting diode 〇LED, and the organic light emitting diode OLED will not emit light (black frame). And, as shown in FIG. 9 , by inserting such a dark frame period into a frame time, the display mode and the sensing mode executable as the touch panel can be implemented. 6 when the pixel circuit in accordance with other embodiments of the present invention operates in the sensing mode 7 as illustrated in FIG. 4, using the sampling voltage (which is obtained during a reset period, an integration period, and two sampling operations) The difference (Δν) between the second sampling of (2) in the relevant double-sampling CDS circuit and the vOUT of the first 200951933 31036pif.doc sampling can be obtained. The critical electric value of the non-uniform, and the critical voltage Δν of the pole _ core P22.获f is not dependent on the source follower. Figure 10 is a first simulation result in accordance with the present invention. Fig. 1 ^ Γ , 'Figure 5 shows the simulation of the pixel circuit, and the result _ is to flow through the heart, the light leakage current, and the ◎ critical is the source follower The transistor ρ2 is confirmed to have a partiality of 85 mV_, but Fig. 11 is a waveform diagram of the voltage of the -_y in accordance with the present invention. Figure 5 shows the umtrr of the sinusoidal circuit. It can be confirmed that the intensity of the light emitted by the surrounding person increases from the weight to the electric ==. One: Na 〇 The thundering period is 'After resetting the source _, the voltage is reset for the period of sampling. It can be confirmed from _ that the sampling voltage of the second sampling period gradually changes with the increase of the light of the human shot. This is because the characteristic of the forward current of the 'P-i-m diode D or the characteristic of the transistor P2 operated by the f pole with the actuator is gradually changed by the change of the incident light. As described above, the variation of the characteristics of the transistor P2 can be compensated by the CDS circuit. According to the operation of the sensory circuit of the first embodiment of the present invention 20 200951933 J iu^opif.doc, one sampling should be performed within 13 ( (ie, one-and-a-half time of the line selection time (r〇w line selection time) ), but due to the parasitic load in the detection environment, correct detection is difficult. Therefore, as shown in Fig. 1A, the detection is performed only by artificially controlling the sampling time by 0.5 ms. By controlling the level applied to the control line REF voltage, the voltage level of the sample can be varied. The sensing pixel circuit fabricated in accordance with the first embodiment of the present invention has an output voltage waveform as shown in FIG. Due to the type of each pixel circuit, the size of the p-i-m diode D and the capacitor CST of the photodetector 不同 will be different, so the variation of the output voltage and the range of the output voltage will be different as the light intensity changes. Table 1 shows the design conditions of the sensing pixel circuit for the active matrix liquid crystal display AMLCD fabricated in accordance with the first embodiment of the present invention. 【Table 1】

Tvoe 1 Type 2 Type 3 Type 4 panel size 5-inch 5-inch 5-inch 5-inch Resolution 640 x 480 (VGA) 640 x 480 (VGA) 640 x 480 (VGA) 640 x 480 (VGA) pim diode 4 〇um/6(im 50ωη/6μιη 60\xm/6um 70um/6um Cst 0.2dF . 0.3dF 0.4pF 0.7pF Aperture ratio 40% _ 37% 35% 31% Each pixel circuit contains different sizes of p_i-m Polar body, CST, and aperture ratio (AR) ° In order to detect the function of each pixel circuit, the light source is used to control the brightness in the dark room to allow external light to enter, and the output voltage is detected by the TDS7104. 21 200951933 31036pif.doc Table 2】

Feature Specification light intensity 0 to 10,000 lx integration time 16.5 ms VpRF 5 Volt Vrhf -5 ~ -3 Volt Figure 12 to Figure 16 show the graph of the output voltage variation amount AV as the brightness of the pixel circuit. 12 to FIG. 16, it can be confirmed that the sensing pixel circuits according to the embodiments of the present invention all have a sensitivity of more than OdB, and it can be confirmed that the sensing pixel circuits of each category have a deviation of type 1 It is 77 mV, type 2 is 84 mV, type 3 is 59 mV, and type 4 is 32 mV. Since type 4 has the largest CST', the deviation of type 4 is minimal, but the range of output voltage is the smallest. When the brightness is from 0 to 100001, the range of output voltages of each category is: typeW15V〇lt, type 2 is 1,4¥, _63 is 1.2乂, and handsome ^4 is 〇.7¥, so 17卩6 1 is the largest. And 'type 1 has a maximum aperture ratio of 40%, so for the AML CD pixel of the active matrix liquid crystal display with the sense and the function of the pixel circuit, the sensing pixel circuit with the design condition of type丨 is the best. . Figure 10 shows the output AV sketch of the VGA and 7 VGA VGAs according to the shell of each of the different types of pixel circuits.

The pixel circuit of the embodiment of the present invention can be applied to an image scanner having an active moment indicator AMLCD pixel. The sputum circuit according to the present invention can be applied to an image scanner or a control panel having an organic light emitting diode OLED 22 200951933 31036 pif.doc. The touch of the OLED of the OLED is the exemplary supervisor of the present invention. The disclosure of the general knowledge is only an example. </ RTI> </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> The electrogram 2 of the "Danjing structure" of the book sinusoidal liquid crystal display AMLCD is the first I according to the present invention. FIG. 3 is a schematic diagram of the image display function of the first time 钱 钱 路 ^ 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照 依照Inventive drag-and-drop operation timing diagram. The flat-panel display device uses the image-swapping function of the embodiment to check the embodiment. "Using the sensing pixel circuit, which is formed in each unit 昼 = Figure 5 Layout of the circuit of the circuit. Circuit of the other embodiment of the present invention is used as a timing diagram for the planar display device. Fig. 5 shows the simulation of the pixel circuit of Fig. 5 of the first embodiment of the present invention. 200951933 31036pif.doc Simulation result. 11 is a waveform diagram of the output voltage of the sensing pixel circuit of FIG. 5 according to the first embodiment of the present invention. FIGS. 12 to 16 show the types of the respective pixel circuits, and the coordinate of the output voltage variation amount AV as the brightness changes. Figure 17 is a graph showing the output voltage variation amount AV detected with the brightness of light according to various types of pixel circuits for 5 VGA and 7 VGA. Fig. 18 is a view showing the first embodiment of the present invention. Block of the flat panel display ® [Main unit symbol description] 10, 510. Sensing pixel circuit 12, 512: Photodetector 14, 514: Discharge area 20: LCD pixel 100: Alizarin circuit 200: Scanning drive area ❹ 3 00 : Dividend drive zone 400: Timing control zone 500: Alizarin zone 520: Red organic light-emitting diode OLED halogen 530: Green organic light-emitting diode OLED halogen 540: Blue organic light-emitting diode OLED halogen CS, Cst, Csr, Csg, Csb, Cr, Cg, Cb: Capacitor 24 200951933 j 丄ujopif-doc D, D2: Diode

Data : Data line em : Control signal ELVDD : Power line LC, LCR, LCG, LCB : Liquid crystal cell N1 : Node OLED: Organic light-emitting diode

P Bu P2, P3, P4, P12, P13, PR, PG, PB: thin film electro-crystals © body TFT PRE: pre-charge signal RST, RWS, REF: control line

Scan : Scanning line ΤΙ, T2, T3, TR, TG, TB: transistor

Tir, T!b, T3r, T3q, Τ3β: Switching transistor T2R, T〗 G, T B: Driving transistor

Vc〇M : Common power Q vPRE: Precharge voltage V〇ut : Output voltage Vth: Threshold voltage AV: Voltage difference Amob : Poor mobility 25

Claims (1)

200951933 31036pif.doc VII. Patent application scope: 1. A pixel circuit with a sensing pixel circuit, including: a capacitor; a signal in response to a control line 'When forward biased, a capacitor It is possible to charge 'and when the reverse axis '= 3', the first voltage charged in the capacitor is subjected to the first discharge C-discharge region, after the integration period, the voltage of the pre-charge, 〇 = the data line of charging The voltage is subjected to the second discharge, and the electric current of the first sampling power is output to the node 'and, after the second discharge is performed, the second pre-charged data line voltage is subjected to the third discharge by the pre-charging, the second Sampling Wei is provided to the round _. According to the circuit of claim 1, wherein the pixel circuit detects a difference between the first sample voltage and the second sample voltage, and performs a sample operation. .昼it as claimed in claim 1 of the patent scope of the sensation of the pixel circuit, the sputum, the road, wherein the discharge zone, after the integration, the precharged green species ~ the miscellaneous line - during pre-charging, in response to the scan line signal sent through the scan, the first pre-charged data line voltage, ^ is second discharged to the scan line, and the third sample voltage is supplied to the transmission line And t: after the second discharge is performed, the voltage is pre-charged, and the line is advanced: in the case of pre-charging, in response to the scan line signal, the voltage will be charged; Three discharges to the scan line, the second sample is provided to the round-out node. 26 200951933 ^ lu^opif.doc 4. The Γ circuit with a sensing pixel circuit as described in claim 1 of the patent scope, the discharge area further comprises: (1) Ν导匕固乐1 $厂Μ一; Ν... ... 'Ugly, ^ -w 昼 电路 circuit, the discharge area further includes: a first transistor having a first electrode that is lightly connected to the phantom line, a control electrode coupled to one end of the capacitor; and a second The transistor has a first electrode coupled to the second electrode of the first transistor, a control electrode coupled to the scan line, and a second electrode coupled to the output defect and the data.佥 5 雷 雷 雷 雷 申 申 申 申 申 申 申 申 5 5 5 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' At the time, the source operates as (10); and the sub-second transistor, which is responsive to transmission of the nickname through the sweep line. Scanning line information pixel ====, ❹ 晶石夕之? Type _ transistor TFT. The body 'is a low temperature. 7. As described in the scope of the patent application: The halogen circuit 'where the light device is a halogen circuit' flows through the 'body' t reverse biased to the external light Pressing the first leakage current of the intensity of the Lei Xidi, will be ~ the charge of the charge - the voltage 'in the point _ heart # will be in the internals of the W, please patent the scope of the four-phase circuit' It is called the unit pixel of the m pixel circuit and the blue element. , color denier, green halogen 9. As described in the patent application (4) 1 _ "Circuit 27 200951933 31〇36pif.doc 昼 circuit, wherein the pixel circuit contains red pixels, or green pixels or One of the pixels of the blue halogen. ' 10. The pixel circuit having the sensory halogen circuit as described in claim i, wherein the pixel circuit further includes a pixel, and the pixel is The data line is coupled to the scan line and is responsive to the image signal transferred through the data line, and the display operation is performed by the light-emitting element. ^ 11. The salty test substance as described in claim 10 A pixel circuit of a circuit, wherein the pixel is an Active Matrix Liquid Crystal Display (AMLCD) pixel. 12. A method for sensing a pixel circuit as described in claim n. The circuit of the prime circuit's towel capacitors relies on the source voltage to be input, and the common power supply voltage is the liquid-powered light unit of the liquid crystal unit (10) 趟 (10). a morpheme with a sensing pixel circuit Road, the towel is the organic light emitting diode (Organic Light Emitting Diode 'OLED) pixel. 〇 = · such as __ patent system 帛〗 3 items have a sensory circuit lightning which capacitor and power supply voltage The line is electrically connected, and the source voltage line is supplied to the power source, and the light-emitting diode (LED) is provided with a 昼 电路 circuit for performing a R-lighting of a natural number.舆 舆 28 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 The scan line; the data drive area&gt; drives the lean line, and the sensing pixel circuit, electrically connects with the scan line and the data line, and performs a sensing operation, wherein the sensing pixel circuit further comprises: a capacitor; in response to a signal of the control line, when the forward bias is applied, the capacitor is charged with a first voltage, and when reverse biased, the capacitor is charged during the integration period. a voltage for the first And a discharge region, after the integration period, the second pre-charged data line voltage is subjected to a second discharge at a precharge voltage, and the first sample voltage is supplied to the output node, and the second discharge is performed And the second pre-charged data line voltage is subjected to a third discharge and the second sampled voltage is supplied to the output node by the precharged voltage. 17. The display device according to claim 16 And wherein the pixel circuit detects a difference between the first sampling voltage and the second sampling voltage, and performs a sensing operation. 18. The display device of claim 16, wherein the pixel circuit further comprises: a halogen element coupled to the data line and the scan line and transmitted in response to 29 200951933 31036pif.doc The image signal is controlled by the light-emitting element, and the control area and the data driving area are controlled. In the sensed pixel circuit 'and the control write = line signal, 4:==; - voltage' during the integration period to perform the first discharge; the brother in the sensed pixel circuit, in today's voltage, will be - after the pre-charging period, the second discharge is performed by the pre-charging the first sampling current I; the line voltage is provided, and the voltage is provided in the sensing pixel circuit, and the voltage of 4 will be pre-charged. After the second discharge, the third discharge is performed by the pre-charged two-sampling voltage to provide a first sampling path: the first-sampling voltage and the second 20.H value are measured, and a sensation is performed. The method, in which the voltage of the material of the 4th electricity_operating party, the second circuit of the t-th circuit 'after the integration period, the pre-charging for the first sampling voltage step ^ data line voltage for the second rose, and then Voltage, after (4) after the integration period, (4) pre-charging trace transmission scan line signal charging = ringing to perform second discharge to the scan line = a pre-charged read line voltage 'Pingtian line, and providing the first sampling Voltage. 5191 vjupif.doc 21. The method of operating a pixel circuit according to claim 20, wherein in the sensing pixel circuit, after the second discharging, the pre-charging voltage is The second pre-charged data line voltage is subjected to a third sampling voltage, and the step of providing the second sampling voltage is, after performing the second discharging, the second pre-charging of the data line by the pre-charging voltage The second pre-charged data line voltage is subjected to a third pre-charge to the scan line in response to the read scan line signal, and the second sample voltage is provided. ❹ 22. The method of operating a pixel circuit as described in claim 19, wherein the first voltage of the capacitor is charged in the sensed circuit, and the first voltage is charged during the integration period. The step is that when the light side H is reverse biased, the optical side is relatively strong in response to the external light, and the capacitor-voltage is subjected to the first discharge during the integration period. The first method of electricity, the operation of the memory circuit of the memory board, the secret book of the secret line, and the image of the f-line and the _ number, transmitted by the light:: mouth data line 24. For example, in the scope of claim 19, S is used as the (5) description of the sensing operation. Sensing circuit