TW201131545A - Pixel circuit and driving method thereof and display panel and display using the same - Google Patents

Abstract

A pixel circuit and a driving method thereof and a display panel and a display using the same are provided. The pixel circuit includes a lighting element and a driving unit, wherein the driving unit is electrically connected to the lighting element and used for making the lighting element to light in response to a data signal and a scan signal and making the lighting element to stop lighting in response to a time-vary signal.

Description

201131545 AUuyn〇86 33651twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a flat display technology, and in particular to a halogen circuit associated with an organic light emitting diode and its driving The method and the display panel and display to which it is applied. [Prior Art] After entering the 21st century, the trend of electronic products will gradually become lighter and transmit a large amount of information and images. In view of this, there is a growing need for a new generation of flat panel displays that are compatible with future life. Since 1987, the United States Kodak Company has published a practical light emitting diode (hereinafter referred to as 0LED) component, which has attracted countless Asian and European and American countries to invest in LED^(4) research and mass production. It is regarded as one of the flat display technologies that have the potential to develop in the future after the tWn film transistor liquid crystal display (hereinafter referred to as tft LCD). 0LED is favored for reasons other than self-illumination, high response speed (lus), power saving (power consumption is only one-third of TFT^CD), thin and light (panel thickness can be less than 1mm), wide viewing angle (18 degrees) Wide color gamut (NTSC 100% or more), low operating voltage (3_1〇v), high contrast (up to 104: 1), etc. The other process is simple and low-cost, and can be applied to the characteristics of the curved panel.

Today's OLED displays can be roughly divided into passive matrix (portal batch ^^ matrix) 〇L; ED display and active matrix (active) 〇LED 201131545 AU0911086 33651twf.doc/n, display. The driving method of the former is mainly to use the scanning means/mechanism to instantaneously generate the brightness, so the power consumption is high, the components are easily deteriorated, and it is not suitable for developing a high-resolution panel; in addition, the latter main driving mode is to utilize a thin film transistor (TFT). The component 'and the capacitor to store different data signals, so as to control the gray scale of each element on the panel (grayscal〇, ^ because the active matrix 〇 LED display after scanning, the enamel can still maintain the original brightness, Moreover, active matrix 〇 LED displays do not require a very high brightness. Therefore, active matrix OLED displays can achieve better lifetime performance than passive matrix 〇 LED displays. High resolution requirements can be achieved. Therefore, current research is directed toward active matrix 〇LED displays that can be used for large panels. However, the biggest problem encountered with OLED components is degradation, which is divided into non-essential degradation and essential degradation. Among them, the non-essential deterioration potential is short or the component degradation caused by encapsulation is mainly manifested in black spots. The production of dark printing (10)) is degraded to the fact that the OLED component is slowly attenuated with increasing time. The phenomenon is not caused by the outside world, but the OLED component itself is used for a period of time. After the deterioration, the results of studying this phenomenon can be described as a hundred schools of thought. The essential degradation of OUD components is the main reason that affects the hooking of 〇LED panels, resulting in thin film transistors in OLED pixel circuits. (TFT) The drift of the critical electric a = (threshold voltage, Vth) caused by positive bias for a long time. As shown in Figure 1, it is the simplest OLED pixel circuit (2Tlc). 1〇〇 schematic diagram 201131545 AU0911086 3365ltwf.d〇c/n Referring to FIG. 1, the operation principle of the pixel circuit 100 is roughly as follows: when the scanning signal vscan received by the scanning line SL causes the thin film transistor T1 to be turned on, the data is The data signal Vdata received by the line DL is stored in the capacitor Cc. In addition, when the scanning signal Vscan received by the scanning line SL causes the thin film transistor T1 to be turned off, the thin film transistor T2 is turned on, so that the film transistor T2 is turned on. The voltage stored in the capacitor Cc corresponds to the drive current i〇led given to 〇leD. As shown in the following formula (1), it is expressed as the drive current Ioled through the 〇LED: she...the formula (1) where K is a film Process parameter of transistor T2 (constant); VGs is the voltage between the gate and source of the thin film transistor T2; and is the threshold voltage of the thin film transistor Τ2. Since the threshold voltage vth of the thin film transistor Τ2 will be in the long time The positive bias drive drives the drift, so once the threshold voltage Vth of the thin film transistor T2 drifts, it directly affects the current flowing through the 〇LED by 1〇1. In this way, the currents flowing through the same data signal Vdata of each OLED. 昼 电路 circuit will be different, so that the gray scales of each 昼 led 昼 也会 will be different, and this also affects the 〇 LED panel uniformity. The main cause of sex. This phenomenon not only causes the life of the LED panel to be greatly different from that of the TFT LCD panel currently on the market, but also causes the 〇LED panel to fail mass production. SUMMARY OF THE INVENTION In view of the above, the present invention provides a pixel circuit that compensates for the threshold voltage drift of the thin film 201131545 AUUyi 1086 33651 twf.doc/n, delays the generation of OLED elements, and reduces the input complexity of data signals. . The present invention provides a pixel circuit including a first to fourth emperor body, a fixed current source, a capacitor, and a light-emitting element. The towel, the first 汲/source of the first 曰曰 body, receives the data signal. The second transistor has a 曰 to receive the scan signal, and the first 源/source of the second transistor is electrically connected to the second 汲/source of the transistor. The fixed current source is electrically connected between the second 汲/source of the second body and the ground potential. The gate of the third transistor = receiving the scanning signal with =, the first 源/source of the third transistor is electrically connected to the second transistor! The first 汲./source' and the second 源/source of the third transistor: the gate of the first transistor is connected. The first end of the capacitor is electrically connected to the gate of the first transistor and the second end of the capacitor is used to receive the time varying signal. The gate of the fourth transistor is electrically connected to the gate of the first transistor, and the -=/source of the fourth transistor is electrically connected to the system high voltage. The anode of the light-emitting element has a second 汲/source of the fourth electric day, and the cathode of the light-emitting element has a low voltage. In the embodiment, the time-varying signal may be a mineral tooth wave contact f m#U, the first to fourth transistors may be a p-type transistor, and the S-light element may be an organic light-emitting diode. The present invention further provides a display panel having the above-described enamel proposed by the present invention and a display to which the same is applied. /, In the consistent example of this, the frequency of the time-varying signal is substantially the update rate of the display. , , , 'This specification provides a driving method for the 201131545 AUUy 11086 33651twf.doc/n 昼 电路 circuit suitable for _ with - organic light-emitting diode, which includes: during charging during a picture, reacting to The scanning signal and the data signal received by the pixel circuit, and the gate voltage of the transistor for driving the organic light emitting diode in the pixel circuit is equal to the voltage level of the data signal, and causes the organic light emitting diode to emit light. And during the adjustment period of the same kneading period, the time-varying signal (which may be a sawtooth wave signal or a square wave signal, which may be a sawtooth wave signal or a square wave signal), and is promoted to drive the organic light emitting diode The gate voltage of the transistor until the transistor is turned off, and causes the organic light emitting diode to stop emitting light. In an embodiment of the invention, the current flowing through the organic light emitting diode is independent of the threshold voltage of the transistor used to drive the organic light emitting diode. The present invention further provides a halogen circuit including a light emitting element and a driving unit. The driving unit is electrically connected to the light-emitting element for reacting to the signal signal and the scanning signal to cause the light-emitting element to emit light, and reacting to the time-varying signal to cause the light-emitting element to stop emitting light. Based on the above, the pixel circuit proposed by the present invention has at least the following features: 1. Using a current mirror compensation method to compensate for the threshold voltage drift of the transistor for driving the light emitting element (ie, the OLED element); Applying a time-varying signal to allow the LED elements of the pixel circuit to have a rest time to stop emitting light during each-plane period, thereby delaying the degradation of the OLED element; and L, the data of the current-glock type input type The signal controls the gray scale of the denier circuit, so that only the appropriate solid 201131545 AU0911086 33651twf.doc/n constant current is needed, (there is no need to make the variable current source) to be input with the voltage type. Data reduction processing; can be used to reduce the complexity of data signal input. It should be understood that the above description and the specific embodiments are merely illustrative and illustrative and are not intended to limit the scope of the invention. [Embodiment] Reference will now be made in detail to the exemplary embodiments embodiments In addition, wherever possible, the same elements or components in the drawings and the like represent the same or similar parts. FIG. 2 illustrates an active matrix organic light emitting diode (AMOLED) according to an embodiment of the invention. A schematic diagram of the display 200. Referring to FIG. 2, the active matrix organic light emitting diode display 200 includes a display panel 2, a data driving device 203, a scan driving device 205, and a time-varying signal generating 207. In the embodiment, the display panel 2〇1 includes at least one data line DL electrically connected to the data driving device 203, at least one scan line SL electrically connected to the scan driving device 205, and at least one pixel circuit Pix, and the pixel circuit The Pix includes a light-emitting element OLED (ie, an organic light-emitting diode) and a driving unit DU. In this embodiment, the driving unit DU is electrically connected to the light-emitting element OLED for reacting with the data signal provided by the data driving device 203 ( The data signal) Vdata and the scan signal Vscan provided by the scan driving device 205 cause the light emitting element OLED to emit light, and

S 9 201131545 AUUV11086 33651twf.d〇c/n reacts to the time-vary signal Vtv generated by the time-varying signal generator 207 (for example, it may be an error wave signal or a square wave signal, but is not limited to This causes the light-emitting element 〇LED to stop emitting light. More specifically, the driving unit DU includes P-type transistors τι to T4, a fixed current source Is, and an electric gCc. The first 源/source of the first transistor 用以 is used to receive the data signal Vdata. The gate of the second transistor τ2 is for receiving the scan signal ν_, and the first source/source of the second transistor Τ2 is connected to the second 汲/source of the transistor Τ1. The fixed current source Is is electrically connected between the second 汲/source of the second transistor T2 and the ground potential. The gate of the second transistor T3 is for receiving the scan signal Vscan, and the first 源/source of the third transistor T3 is electrically connected to the first 汲/source of the second transistor T2, and the second transistor Τ3 The second 汲/source is electrically connected to the gate of the first transistor Τ1. The first end of the capacitor Cc is electrically connected to the gate of the first transistor τι, and the second end of the capacitor Cc is used to receive the time-varying signal Vtv. The gate of the fourth transistor T4 is electrically connected to the gate T1 of the first transistor, and the first gate/source of the fourth transistor T4 is electrically connected to the second voltage of the fourth transistor T4. The 汲/source is electrically connected to the anode of the illuminating element 而1^〇, and the cathode of the illuminating element ((^^〇) is electrically connected to a system low voltage Vss. Based on the above, Assume that the time-varying signal generator 2〇7 generates a time-changing 5 Tiger Vtv for the Sawtooth wave signal (hereinafter referred to as the time-varying signal Vtv is a sawtooth wave signal vtv), then Figure 3猞Show soap is invented in an embodiment of the pixel circuit Pix in the active matrix organic ^ light: pole 201131545 AU0911086 3365 ltwf.doc / n body display fast 200 - a screen during the FP scanning signal vscan, the fourth transistor T4 gate A schematic diagram of the pole voltage Vg and the current Ioled flowing through the light emitting element 〇LED. Referring to FIG. 2 and FIG. 3 together, in the embodiment, the pixel circuit Pix is in the active matrix organic light emitting diode display 2 The operating conditions in the FP during the squatting period can be roughly divided into two phases, one of which is the charging period. The charging period A and the other is the adjusting period B, and the frequency (frequency) φ of the sawtooth wave signal Vtv is substantially equal to the face renewal rate of the active matrix organic light emitting diode display 200 (frame) When the pixel circuit Pdc is in the charging period A, it will emit light in response to the scanning signal Vscan and the data signal Vdata. More specifically, when the wintersing circuit P ix is in the charging period A, the scanning signal vsc an is Low ^ ^ level. As a result, the transistors T2 and T3 are turned on to cause the capacitor Cc to be charged via the time varying signal Vtv and the transistors Τ 2 and T3. In this embodiment, when the capacitor Cc is charged until stable In the state, the voltage Vg of the fourth transistor D4 is a fixed voltage difference Vgs based on the fixed current element Is and the data signal Vdata. Also, the gate voltage Vg of the fourth transistor T4 is Therefore, the fixed bias voltage is controlled by the data signal Vdata. In other words, the gate voltage Vg of the fourth transistor T4 is completely determined according to the size of the resource number Vdata. The pixel circuit Pix is determined by the charging period A. After the voltage level of the gate voltage Vg of the crystal T4, the adjustment period B is entered. According to FIG. 3, the gate voltage Vg of the fourth transistor T4 is pulled up by the gradually rising sawtooth wave signal Vtv. Come, when the voltage of the terminal voltage vg of the 201131545 auuv 11086 33651twf.doc/n of the fourth transistor T4 rises to reach its threshold voltage vth, the light-emitting element 〇led will not pass any current, that is, no current. It flows through the light emitting element OLED. In the present embodiment, 'when the current loled flowing through the light-emitting element OLED will be zero, and the magnitude of its initial current depends on the fourth transistor T4, and the gate voltage Vg is defined as the electrical index defined by the charge (A). And set. If the voltage level of the gate dust Vg of the fourth transistor T4 is higher, the illuminating tree GLED Ioled is smaller, and the recording is raised to the fourth transistor T4 _ voltage limit, thereby causing the light-emitting element 〇led has a longer time and does not flow through any current Ioled, and vice versa. Based on the above, the tribute signal received by the pixel circuit pix during the charging period A determines that the gate voltage Vg of the fourth transistor T4 is greater than two == the pixel circuit ΗΧ enters the adjustment period B and flows through the illuminant H Γ (4) Large and light-emitting components _ when the second ί 若 主动 active matrix money LED display 200 has a face update rate greater than 6 GHz, then human vision does not flow without current through the pixel circuit Pix, illuminate The component 〇 无 ( ( 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停 停Together, it determines the gray scale of the pixel circuit. It can be seen that the pixel circuit pix has a break during the period of each 昼 - 〇 停止 停止 = = = = = = = = = = = = = = = = = = = = = = = = = = = = The effect of the degradation of the essence of the returning light tree 12 201131545 AUuyn〇86 33651hvf.d〇c/n. More clearly, the figure shows the _voltage Vg and the flow of the fourth electro-crystal of the invention - the embodiment Current of the unit Ο· (10) ^Picture. Please refer to Figure 4, Figure 4 The label is the system high second coating Vdd, the label 402 is the fourth transistor, and the 4th pole is the electric castle. No. 403 4 flows through the light-emitting element 〇LED current i〇ied. From Figure 4: J can see: When the threshold voltage of the inter-electrode τ crystal Τ4 of the four-transistor T4 is -, the voltage flowing through the illuminating element =, ώ, ώ will be reduced until the fourth electric (four) Τ 4 off (that is, the oled method). In this way, the present embodiment utilizes this-electrical-to-image, which can affect the low luminescence of the county. The square current, the current of the fixed current source Is entering the room A in the pixel circuit pix can be expressed as the following formula (2) ) : ^ where 'Κτι is the process parameter of transistor T1 (constant); v ^ voltage between gate and source of transistor T1; and Vtht is transistor τι 2 for::2::) The gate voltage Vg of the four transistor T4 can be transferred to VS^Vdat.a-\VTHJ\

Π Equation (3) Therefore, the flow of the light through the fourth transistor T4 through the light-emitting element 〇LED current Ioled can be expressed as the following formula (4):

Ioled = KTA (Vdata -\VTH n |.

.cis + lKw,n|)2 ...Formula (4) n 201131545 AUO911086 33651twf.doc/n where KT4 is the process parameter of transistor T4 (which is a constant); and Vth, t4 is the threshold voltage of transistor Τ4. Here, assuming that there is no difference between the process parameter Vthti of the transistor τι and the process parameter VTHT4 of the transistor T4, the current I 〇led flowing through the OLED OLED through the fourth transistor T4 can be more expressed as a formula (5). ): —d = -Vdd_·.. The formula is based on equation (5). It can be known that the threshold voltage drift caused by the fourth transistor τ4 being subjected to a long-term positive bias does not affect the current flowing through the light-emitting element _ OLED. The size of the Ioled is such that the uniformity of the display panel 2〇1 rises. ^ Further, the pixel circuit Pix of the present embodiment controls the gray scale represented by the pixel circuit j>jx by the fixed current source [s with the data signal Vdata input by the voltage type. In this way, the embodiment only needs to design a suitable fixed current source Is (no need to use a complex variable current source) to match the data signal input of the voltage type input processing chip, thereby achieving the reduction of the data signal Vdata input. the complexity. In addition, the above embodiment is described by taking the time-varying signal Vtv as a rock tooth signal as an example. However, the present invention is not limited thereto. More specifically, if the time-varying signal Vtv generated by the time-varying signal generator 207 is a square wave signal, then FIG. 5 is green as shown in another embodiment of the present invention. The matrix organic light-emitting diode display 200—the scanning signal vscan in the FP period, the gate voltage Vg of the fourth transistor T4, and the electricity flowing through the light-emitting element 〇leD 14 201131545 AUuynu86 33651twf.doc/n flow Ioled schematic diagram. In this embodiment, when the time-varying signal Vtv generated by the variable signal generator 207 is a square wave signal (the frequency is substantially equal to the face update rate of the active matrix organic light-emitting diode display 200), the pixel is Circuit

Pix in the active matrix organic light-emitting diode display 2 〇〇 a written period FP operation can be roughly divided into two stages, which is - charging period A ', and the other is the adjustment period B, . However, since the pixel circuit pix^ enters the charging period A, and the adjustment period B' is similar to the pixel circuit pix entering the charging period A and the adjusting period B, respectively, it will not be described herein. On the other hand, although the pixel circuit pix of the above embodiment is described by taking the p-type transistors T1 to T4 as an example, the present invention is not limited thereto. More specifically, in other embodiments of the present invention, the P-type transistors T1 to T4 of the pixel circuit Pix may be converted into a 1^-type transistor. In this way, the scanning signal Vscan only needs to be changed correspondingly to the time-varying signal Vtv, so as to achieve similar/similar technical effects as the above embodiment. However, the contents of these teachings are familiar to those of ordinary skill in the art, and should be deduced by themselves/subjects, and therefore will not be further described herein. Based on the disclosure of the above embodiments, the present invention is a driving method for driving a food circuit having an organic light emitting diode (OLED), which includes: During the charging period, the reaction signal and the data signal received by the pixel circuit are reflected, and the gate of the transistor for driving the organic light-emitting diode in the book is used to control the electric signal of the poor signal. Causing the organic light-emitting diode to emit light (step 15 201131545 AU0911086 3365 ltwf.doc/n tilting: and during the same - 昼 期 _ adjustment period, reacting to the time-varying signal received by the pixel = road (for example, it can be (four) wave The signal or square wave is limited to tb), and the voltage of the gate electrode for driving the organic light emitting diode is increased until the transistor is turned off, and the organic light emitting diode stops emitting light (step S603). "^上上34, this hair _ proposed 昼 circuit has at least the following characteristics:

The electric w mirror is also (4) - the transistor T1 and the fourth transistor ^ complement your way to compensate the threshold voltage drift of the transistor for driving the light-emitting element 〇 LED (also I7 Si four transistor T4); The variable signal (Vtv) is used to make the illuminating element of the halogen circuit, the 0LED has a rest time to stop the illuminating during each 昼 surface, thereby delaying the degradation of the OLED element; and 3. using the fixed current source and the voltage type input The data signal comes from the ash p from the binary circuit, so that only a suitable fixed current source (no need to use a complex variable current source) is needed to match the voltage type.

The input data signal can process the wafer, so as to reduce the complexity of data signal input. The present invention has been disclosed in the above embodiments, and it is not intended to limit the invention to those skilled in the art, and it is possible to make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. [Simple diagram] 16 201131545

Auuyn086 33651twf.doc/n Figure 1 shows a schematic diagram of the simple circuit (2T1C) of the simplest organic light-emitting diode (0LED). 2 is a schematic diagram of an active matrix organic light emitting diode (AMOLED) display according to an embodiment of the invention. Figure 3 shows the invention as an implementation - an organic light-emitting diode display with a book circuit in an active matrix

The extreme voltage between the crystals, as well as the flow through the light, is shown in Fig. 4 as an embodiment of the invention. A simulation of the current flowing through the illuminating element. Gate voltage of the transistor FIG. 5 is a schematic diagram of a gated organic light-emitting diode display of the present invention, which is a gate voltage of the active-type rectangular crystal, and flows through the internal scanning signal, FIG. 4 is a schematic diagram showing currents according to an embodiment of the present invention. A photodiode (OLED) 昼 电路 circuit for driving a driving method with an organic ray [main component symbol description] 100, Pix: 昼 电路 circuit 200: active matrix organic hair _ 201: display panel - egg body display 203. Poor material driving device 205: Scanning driving device 207: Time-varying signal generator SL. Scanning line DL: data line 201131545 auuvi i086 33651twf.doc/n

Cc: Capacitor T1~T4: Transistor DU: Drive unit . OLED: Organic light-emitting diode/light-emitting element Vscan: Scan signal Vdata: Data signal.

Vtv: time-varying signal / sawtooth wave signal / square wave signal

Ioled, 403: current flowing through the organic light-emitting diode

Is a fixed current source

Vdd, 401. 糸South voltage

Vss: system low voltage

Vgs. Voltage between the gate and the source of the transistor

Vg, 402: gate voltage of the transistor

Vth: threshold voltage of the transistor FP: facet period A, A': charging period B, B': adjustment period · S601, S603: an embodiment of the invention is suitable for driving with an organic light emitting diode (OLED) Step 18 of the driving method of the pixel circuit

Claims (1)

201131545 Λυυ>ιι086 33651twf.doc/n VII. Application for Patent Park: 1. A morpheme circuit, including: - 2 its first - no, the source is used to receive - data signal; Le Yi% 曰曰 body's gate The pole wave/source is electrically connected to the first---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ...and / between the source and a ground potential. The second indium of the second transistor is used to receive the 汲/source electrically connected to the second transistor: The first and/or source are electrically connected to the pole of the first crystal and the first end of the first valley is electrically connected to the second end for receiving a time-varying signal; the gate of the transistor, and a fourth transistor having a gate electrode, a first-turn/source electrically connected to the gate of the first-transistor, a light-emitting element, an anode electrically connected to the d-voltage; and a source and a cathode thereof The second 汲 electrically connected to the n crystal / 2. The 4 bis signal as described in claim W includes a surface wave signal or a square wave circuit, wherein The third and the fourth transistor are respectively -P, the second, the second component is an organic light emitting diode. The body, and the light emitting type 3. The display panel comprises: at least one data line At least one scan line; and at least - a halogen circuit, including: 19 201131545 Λ^υ^ΐ!〇86 33651twf.doc/n One crystal, the first -bm K \, receiving a data signal; Bu, the raw connection of the data line to a second transistor, the gate electrical scanning signal 'the first first electrical connection to receive - / source; the second day of the electric Japanese body, "fixed current source, Electrically connected between the second source and a ground potential; and the daytime body and/or a third transistor, the gate electrical scanning signal, the first-assisted hybrid connection of the first === Receiving the source/source, and the second non-source is electrically connected to the first first capacitor of the first electric body, the first end of which is electrically connected to the second body; and the second end thereof is used for Receiving a one-time variable signal; the gate of the t-body, the anode of the optical connection, the anode is electrically connected to the first change Panel, wherein the under-tooth wave signal comprises a signal or mineral - ^ square wave the third and the fourth transistor respectively, - ": two elements - OLED.胄(五)体, and the display of the first 5.-type display, comprising: a display panel comprising: at least one data line; at least one scan line; and 20 201131545 Auuyi j〇86 33651 twf.doc/n at least one element The circuit includes: a first transistor, the first 源/source is electrically received to receive the data signal; migrating the cultivating line to the first transistor, the gate electrically connected to the scan signal, and the first-none/ Source electrical connection: Tianshou 汲 / source; electric Japanese body 2, - fixed current source, electrically connected to the second · < and / source and a ground potential; The second transistor of the second one, the gate electrically having the scan signal, the first 汲/source is electrically connected to the trace to receive the 汲/source ′ and the second 崎 is electrically connected to the first a capacitor whose first electrical connection is connected to the gate of the first body; the second terminal is used to receive a time-varying signal; the gate of the transistor is a fourth transistor, and the gate is electrically connected to the gate a pole, the first 汲/source is electrically connected to a system high voltage]: a light-emitting element of the body, the anode of which is electrically connected to the second /source" and its cathode is electrically connected to - the system is low ^ transistor of the sixth. According to the scope of the fifth aspect of the patent application; data drive device, connected to the data line, with a two-scan drive And electrically connected to the scan signal; and for providing the sweep-time-varying signal generator, electrically connecting the electricity to generate the time-varying signal. The syllabus is used for 2) 201131545 AU0911086 33651twf.doc/n 7. The display of claim 5, wherein the time change 5 tiger includes a mine tooth signal or a square wave signal, and the time The frequency of the variable signal is displayed on the display update rate of the display; the first, the second, the second and the fourth transistors are respectively a p-type transistor; and the light-emitting element is an organic light-emitting Diode. 8. A driving method for driving a pixel circuit having an organic light emitting diode, the driving method comprising: reacting to a scanning signal received by the pixel circuit during a charging period of a picture a data signal for controlling a gate voltage of the transistor for driving the one of the organic light-emitting diodes to be equal to an ink level of the data signal and causing the organic light-emitting diode to emit light; During an adjustment period of the kneading period, the gate voltage of the transistor is raised in response to a time-varying signal received by the pixel circuit until the transistor is turned off, and the organic light-emitting diode stops emitting light. 9. The driving method of claim 8, wherein the current of the organic light emitting diode is independent of the threshold voltage of the transistor. 10. The driving method of claim 8, wherein the time varying signal comprises a sawtooth wave signal or a square wave signal. ® 11. A halogen circuit comprising: a light-emitting element; and a driving unit electrically connected to the light-emitting element for reacting with the data signal and a scanning signal to cause the light-emitting element to emit light and reacting to the one-time variable signal The light-emitting element is caused to stop emitting light. 12. The patent circuit 5 as described in claim 11 wherein the reading 22 201131545 AU0911086 33651twf.doc/n driving unit comprises: I:::, the source is used to receive the data signal; and/or朽*κ+ι日日', the open pole is for receiving the scan signal, the first first pole is electrically connected to the second and/or source of the first crystal; the fixed current source is electrically connected to the first Between the source and a ground potential; the electric Japanese version of the brother of a 汲 / - third transistor, the gate is used to receive the 汲 / source electrically connected to the second transistor" Tian ^, Gan, brother a 汲/source; ^f is connected to the _ drain of the first transistor, and the second is connected to the gate of the Γ transistor, and the gate of the galvanic transistor is connected to the illuminating element The anode, whose second is not/sexually connected to a system low voltage. Thus, the cathode electrical energy of the 5 illuminating element is 13. If the application of the patent is changed, the second tiger includes a sawtooth wave signal or a prime circuit, wherein the first, the third and the fourth square wave are 5fL; the first, the first The light-emitting element is - an organic light-emitting diode, and the other is - a crystal; and the 23