TW201203199A - Pixel driving circuit and pixel driving method - Google Patents

Abstract

A pixel driving circuit adapted to drive a light emitting device is provided. The pixel driving circuit includes a first driving unit, a second driving unit, and an adjust unit. The first driving unit is used to drive the light emitting device, wherein the first driving unit includes a driving transistor. The second driving unit is used to provide a data voltage to the driving transistor, such that the first driving unit drives the light emitting device according to the data voltage. The adjust unit is used to adjust the gate voltage of the driving transistor. The adjust unit includes a set capacitor and a transistor, and the set capacitor and the transistor are coupled in series between the first driving unit and the second driving unit. Furthermore, a pixel driving method is also provided.

Description

201203199 W · * ^ Λ ^ rr &·«»Οθ/Χ VI. Description of the Invention: [Technical Field] The present invention relates to a driving circuit and a driving method, and β relates to a pixel driving circuit and 昼Prime drive method. Specially, [Prior Art] One of the techniques. Recently, due to advances in technology, the brightness and lifetime of organic light-emitting diodes (OLEDs) have been greatly improved, and they have high contrast and high-vision Low-power consumption, the organic light-emitting diode display is regarded as the most promising flat-panel display technology in the future. 5 In the case of the application, the organic light-emitting diode display is mostly driven in an active manner ( Active matrix, AM) for older resolution and less noise interference. Driven by the active mode, each element of the =-emitting diode display needs to be equipped with a thin film transistor, and the second driving corresponding organic light-emitting diode emits light. However, for the process of large-faced ^, the thin-film transistor is prone to characteristic variation, and the sag is seen in the threshold voltage of the component, and the 饴 is also the variation of the process or the electrical bias of the branch. Shift effect. Therefore, how to modulate the voltage to achieve uniform brightness output has become an important topic. Figure 1 illustrates a conventional pixel drive circuit for addressing critical voltage variations. Referring to FIG. 1, in the conventional pixel driving circuit, in addition to the driving transistor DTFT for driving the pixel, the pixel driving circuit further includes a switch 201203199

34iyitwf.doc/I The transistors SW1 to SW3 are used to memorize the threshold voltage of the transistor DTFT, which operates as follows. First, at period 耵, the voltage VDD precharges the gate of the driving transistor DTFT. Thereafter, at a period of 2, the signal DT is set to the data voltage VDATA, and the gate voltage of the driving transistor DTFT is discharged through the switching transistors SW1 and SW2 until the voltage at the point is equal to the threshold voltage vT plus the data voltage Vdata ( The discharge is stopped when Vt+Vdata), and the threshold voltage value is recorded. Finally, the signal TN〇 turns on the switching transistor SW3 to cause the voltage vDD to start driving the organic light emitting diode OLED. ® It is worth noting that although this design is suitable for an enhancement mode transistor, when the transistor element is a depleted 〇de transistor, the target of the predetermined discharge is in the above period T2. The voltage Vt+Vdata will be less than the threshold voltage ντ, so that only the gate voltage of the driving transistor can be discharged to the level of the data voltage VDATA, and the function of the memory threshold voltage is lost. Therefore, when the transistor element is a depleted transistor, the display using the above-described halogen drive circuit is still inferior in picture quality. In the prior art, many other techniques for compensating the critical voltage variation of the component are also mostly designed using this principle, so the same problem is still encountered when using a depleted transistor as a halogen component. SUMMARY OF THE INVENTION An exemplary embodiment of the present invention provides a pixel driving circuit. When the transistor component of the pixel drive circuit is a depleted transistor, the two-circuit circuit can still operate normally and compensate for the critical voltage variation of the drive transistor. An exemplary embodiment of the present invention provides a halogen driving method suitable for

201203199 ^iyiiwi.u〇c/I Action: Road. When the transistor component of the pixel driving circuit is depleted, the driving method of the pixel can still compensate for the uniformity of the brightness of the critical electric panel of the driving transistor. In the drive one: the C embodiment provides a kind of elementary drive circuit, which is 70 elements. The pixel driving circuit includes a second driving single drive modebook, a moving single 70 and an adjustment single A. The first driving unit is used for the second boat t, wherein the first drive-only transistor-first transistor. The first: move? Early; " to provide - to the first - transistor, so that the first - early according to the data voltage to drive the light-emitting elements. The adjusting unit is configured to adjust a gate voltage of the electric male body, wherein the adjusting unit comprises: setting a capacitance and (4)=a transistor, and the setting capacitance and the second transistor string are connected to the first first 70 and the second driving unit. between. In an exemplary embodiment of the invention, the set capacitor is used to adjust the gate voltage of the first transistor. ϋ—The invention of the example of the patch. The above-mentioned 昼素县circuit package = storage capacitor. The storage capacitor is secreted by the first - the crane unit and the second drive m to store the data voltage at the gate of the first transistor. In an exemplary embodiment of the present invention, the first driving unit further includes a triple transistor. The third transistor has a gate, a - source, and a poleless number. Ir source / bungee. The gate of the third transistor is controlled by a first control signal: the first source/drain of the second transistor is coupled to a first voltage. The third source = the second source / the pole is not connected to the first transistor - the first source / the no pole. A second source/drain of the first transistor is coupled to one of the first ends of the light emitting element, and the second end of the light emitting element is reduced to a second control signal. 201203199

34191 twf.doc/I In an exemplary embodiment of the invention, the second driving unit includes a fourth transistor and a fifth transistor. The fourth transistor has a gate, a first source/drain, and a second source/drain. The gate of the fourth transistor is controlled by a third control signal. The first source/drain of the fourth transistor receives the data voltage. The second source/drain of the fourth transistor is coupled to the gate of the first transistor. The fifth transistor has a gate, a first source/> and a pole, and a second source/

a gate of the crystal, and the second end of the adjustment unit is coupled to the source/汲/pole of the first transistor. The gate of the fifth transistor is controlled by a fourth control signal. The first source/drain of the fifth transistor receives the data voltage. The second source/drain of the fifth transistor is coupled to the second source/drain of the first transistor. Here, the adjustment unit has a first end and a second end. The first end of the adjusting unit is connected to the first electrode. In an exemplary embodiment of the present invention, the pixel driving circuit has a first control signal, a second control signal, a third control signal, and a fourth control during a precharge period. The signal is 咼 position. During a set period, the first throttle signal and the third control are reduced to a low level, and the second (four) signal and the control signal are at a high level. In the illuminating period, the first control signal is at a high level, and the second control is reduced, the third control is reduced, and the (four) xianxian low level. In an exemplary embodiment of the present invention, the first transistor, the first The second transistor, the third transistor, the fourth transistor, and the fifth transistor comprise at least one depletion transistor. In an exemplary embodiment of the invention, the first transistor of the fourth transistor is Extremely receiving a reference voltage. In an exemplary embodiment of the present invention, the first driving unit is further included 201203199

..........oc/I 2 third transistor. The third transistor has a gate, a first source/drain, and η - a second source/drain. The gate of the third transistor is controlled by a first control signal. The second source of the third transistor is not extremely secretive - the second electricity 4. Here, the first end of the light-emitting element is connected to the second control signal, and the second end of the light-emitting element is lightly connected to one of the first source/no-pole of the first transistor. The first source of the first-electrode crystal is not extremely secretive to the first source/drain of the third transistor. In an exemplary embodiment of the invention, the second driving unit includes a fourth transistor and a fifth transistor. The fourth transistor has a gate, a source/'and a pole and a second source/no pole. The fourth transistor is extremely controlled by a - third control signal. The first source and the rear pole of the fourth transistor receive the data voltage. The second source of the fourth transistor and the pole of the pole-to-electrode. The fifth transistor has a gate, a first source and a second source/drain. The gate of the fifth transistor is controlled by a fourth control signal. The first source/no pole of the fifth transistor receives the data voltage. The second source/drain of the fifth transistor is lightly connected to the first and the second of the first transistor. Here, the adjustment order has: a - end - and a second end. The second end of the adjustment unit is connected to the second end of the first terminal of the adjustment unit. In the exemplary embodiment of the present invention, the above-mentioned pixel drive circuit is during a precharge period. 'The first control signal is low, and the second control signal, the third control signal and the fourth control signal are at a high level. During the predetermined period, the first control signal, the second control signal, and the third control signal are low-level and the fourth control signal is a horizontal position. During a lighting period, the first control signal and the second control call are at a high level, and the third control signal and the control signal are at a low level. &201203199

34191 twf.doc/I Another exemplary embodiment of the present invention is suitable for a book-driven narration-driven method, which is early. The halogen driving method includes the following steps: early pressing and one adjusting, driving the light emitting element, wherein the first driving unit comprises: the first driving unit is based on the data electric body, so as to make the constant capacitance and the electric current adjusting unit Including: connecting the first electric body string between the first driving unit and the second driving unit _ In the exemplary embodiment of the present invention, in the step of adjusting the voltage, by setting the capacitance, the gate of the body Extreme pressure. The gate electrode of the dynasty-transistor is turned over in the present invention. The above-mentioned elementary driving capacitor is lightly connected to the first driving unit and the second driving unit. The storage voltage is stored by the storage capacitor. A transistor. A closed pole. In an exemplary embodiment of the present invention, the adjusting unit is: an end and a second end. In the step of providing the data voltage to the first transistor, during the precharging period, the first end and the second end of the adjusting unit are respectively charged to the data voltage and a first voltage. In an exemplary embodiment of the present invention, in the step of adjusting the gate of the first transistor, the first end of the adjusting unit is discharged by the second driving unit and the adjusting unit during the in-destruction period. Compensating for the first electro-crystal 201203199 ^ * The critical voltage value of the body. In the exemplary embodiment of the present invention, in the step of driving the light-emitting element, during a light-emitting period, the first transistor is turned on according to the threshold voltage value of the first transistor memorized by the set capacitance, by using the first Voltage Drive = Illumination In an exemplary embodiment of the present invention, in the step of providing a data voltage to the first transistor, a reference voltage is further provided to the first transistor. Based on the above, in an exemplary embodiment of the present invention, the pixel drive circuit and the pixel drive method can be used to compensate for unevenness or drift of the drive transistor voltage, to provide a relatively uniform current of the light-emitting element. In addition, in the exemplary embodiment of the present invention, even if the pixel driving circuit is composed of a depleted transistor, the threshold voltage compensation function of the driving transistor can be normally operated: The above described features and advantages of the present invention will be more apparent from the following description. [Embodiment] Recently, the realization of soft electronic devices has become possible due to the discovery of new semiconductor materials. This is attributed, for example, to the semiconductor material of the machine, which is a zinc oxide semiconductor material which can be appreciated at low temperatures and is therefore particularly suitable for fabrication on a flexible substrate. However, transistors on plastic flexible substrates often have a biased element. That is to say, 'the transistor will benefit when it is not biased between the transistors, and it will be closed. Because of the above characteristics, the existing halogen drive circuit is easy to generate errors' and cannot compensate for the variation of the critical double. dare

201203199 ^4iyirwf.doc/I The unevenness of the panel brightness. Therefore, at least in order to solve the above-described example of the brightness uniformity of the flexible panel display, in the embodiment of the present invention, the pixel driving circuit and the pixel driving method can overcome the conventional pixel driving circuit applied to the depleted transistor. The problem of time lapse is to get a better quality display. In the following exemplary embodiments, an organic light-emitting diode will be used as a light-emitting element, and any person skilled in the art will recognize that the organic light-emitting body is not intended to limit the light-emitting element of the present invention. At the same time, the present invention is not limited to the pixel driving circuit used in the flexible panel display, and any of the pixel driving circuits used as the panel elements in the present invention is in the scope of the present invention. Figure 2 is a block diagram of a pixel drive circuit in accordance with an exemplary embodiment of the present invention. Figure 2 is a circuit diagram of the adjustment unit of Figure 2A. Referring to FIG. 2A and FIG. 2, the pixel drive circuit 200 of the present embodiment is adapted to drive a light-emitting component D, which includes a first driving unit 21 (), a second driving unit 220, an adjusting unit 230, and a Storage capacitor CST. Here, adjust the single 兀23〇. The setting capacitor cSET and the transistor L are connected in series between the driving unit 7L 210 and the second driving unit 22A. In detail, in the present embodiment, the light-emitting element D is, for example, an organic hair-emitting diode which is a halogen on a flexible substrate of a soft panel-type age. The first driving unit is driven by the driving transistor 1 to drive the light emitting element D. The second driving unit 22G is configured to supply the data voltage VData to the driving transistor τ, so that the driving transistor Ti can be driven according to the data voltage VDATA. Light-emitting element D. In addition, the storage capacitor CsT is between the first 201203199-.......-jc/l drive unit 210 and the second drive unit 22〇, with VDATA driving the gate of the transistor Τ. It is worth noting that the adjustment unit 230 of the present embodiment can drive the closed-pole electric dust of the transistor L (that is, the node I of the node M) adjusts the transistor I of the whole unit 230 to be controlled by the control signal SET. And the switch circuit 200 is turned on or off during different operation periods to drive the adjustment path of the gate voltage of the transistor τ!. Therefore, when T2 is turned on, the set capacitance 'adjustable drive transistor voltage and memory The threshold voltage value of the driving transistor is thus. Therefore, in the embodiment, by the action of the adjusting unit 230, the pixel driving circuit 200 can compensate for the uneven shift of the threshold voltage of the driving transistor to provide the light-emitting element 1 ) a more uniform current. Further, the first driving unit 210 further includes an transistor Τ3. The gate of transistor A is controlled by a control signal 第一 (first control signal). One source/drain of the body A is coupled to a high level voltage 乂 (10) (first voltage). The other source/drain of the transistor Τ3 is coupled to one of the source/drain electrodes of the driving transistor Τ. The other source/drain of the external driving transistor 1 is coupled to the anode of the light-emitting element D, and the cathode of the light-emitting element D is coupled to the control signal VL (second control signal).

The second driving unit 220 includes a transistor T4 and a transistor T5. The gate of the transistor 4 is controlled by the control signal CH (third control signal). One source/pole of the transistor 4 receives the data voltage VDATA. The other source of the transistor Τ4 is connected to the gate of the driving transistor 1. Therefore, when the control signal CH is at a high level, the transistor Τ4 is turned on, thereby providing a data voltage VDATA 201203199

34iyitwf.d〇c/I to the drive transistor. In addition, the gate of the transistor 5'5 is controlled by the control signal SET (fourth control signal). One source/drain of the transistor Ts receives the data voltage Vdata. The other source/drain of the transistor D is coupled to the source/drain of the driving transistor T1. Here, one end of the adjusting unit 230 is coupled to the gate of the driving transistor Τ1 by the node ηι, and the other end of the adjusting unit 230 is coupled to the other source/" and the pole of the driving transistor 由 by the node 叱. Fig. 3 is a timing chart showing the driving of each control signal of the pixel drive circuit of Fig. 2; Referring to FIG. 2A, FIG. 2A and FIG. 3, in the embodiment, the transistor elements of the pixel driving circuit 200 are, for example, n-type transistors, and the two ends of the adjusting unit 230 are respectively connected to the node and the node. Taking the driving timing of the control signal of FIG. 3 as an example, the pixel driving circuit 200 of the present embodiment can be divided into the following operation stages: (1) Pre-charging period: During the pre-charging period pi, the control signals EM, VL, Both CH and SET are at a high level, so the transistor ΙΆ is turned on, so that the second driver • the unit 兀 220 can set the data voltage VDATA to the node η by the transistor 卞3. In addition, the voltage of the node 可 can be set to be close to the high level voltage Vdd via the transistor 1 via the adjustment of the transistor size. Here, the control signal VL at a high level is used to prevent the light-emitting element D from leaking. (2) Setting period: During the setting period P2, the control signal leg and CH are low level, and the control signal VL and SET^r^ level. Therefore, the low level control signal (3) turns off the transistor A, which in turn causes the node to be in a floating state. At the same time, low standard 201203199

The control signal EM of the Hiyiiwi.uoc/I bit also turns off the transistor T3, thereby isolating the high-level voltage VDD. During the set period Ρ2, 'the voltage of the control signal VL and SET is high level' Ip is transmitted through the transistor τ2, capacitor Cset and transistor 调整, Τ5 of the adjustment unit 230 until the voltage of the node ηι is equal to the critical value. The discharge is stopped when the voltage vT is added to the data voltage Vdata (Vt+Vdata). At this time, since the driving transistor is turned off, the node n is prevented from being discharged. Therefore, the threshold voltage information of the driving transistor is stored in the storage capacitor or the setting capacitor CSET. (3) Illumination period: In the illumination period P3, except that the control signal EM is at a high level, the control signals VL, CH, and SET are both low level and high level control signals em for providing a high level voltage VDD. The light-emitting element D (i.e., the panel element) is given. In addition, the control signal SET needs to be at a low level to turn off the transistor Τ2, so as to prevent the voltage edge of the node η2 from affecting the voltage value of the node. The control signal v1 becomes a low level, so that the light-emitting element D can start to emit light. - From the above operation stage, since the threshold voltage of the driving transistor has been memorized in the storage capacitor cST or the set capacitor Cset, the unevenness of the output current of the driving transistor can be improved. Therefore, in the present embodiment, even if the halogen driving circuit 2 is composed of a depleted transistor, the threshold voltage compensation function of the driving transistor 1 can still be normal = 2, and FIG. 4 is a conventional one. The output current vs. data voltage diagram of the prime driver circuit. Fig. 5 is a diagram showing the relationship between the current of the driving circuit and the data voltage of the pixel of Fig. 2A. Fig. 6 is a graph showing the relationship between the uniformity of the output current of the pixel drive circuit of Fig. 2A and the conventional halogen drive circuit. 14 201203199

^i^xiwf.doc/I Please refer to FIG. 4 to FIG. 6. FIG. 4 and FIG. 5 are respectively obtained by simulating the pixel axis circuit of the conventional pixel and the pixel driving circuit of the figure, and output current ^ data voltage. relation chart. The components in the pixel drive circuit use the a-IGZO_transistor element as a reference for the component model parameters. The measured threshold voltage value VtU5V of the driving transistor is measured, and the threshold voltage Vt variation is assumed to be IV. ^ Use the output current of the conventional halogen drive circuit to the data voltage, as shown in Figure 4. In the conventional pixel driving circuit, the function of the original compensation threshold voltage variability is invalid due to the use of the depleted transistor, resulting in a non-uniform output current as shown in FIG. Conversely, using the pixel drive circuit of Figure 28, this problem can be successfully overcome. The result of the output current of the pixel drive circuit of Fig. 2A versus the data voltage is shown in Fig. 5. It can be seen from Fig. 5 that the threshold voltage of the driving transistor ^ under the variation of positive and negative IV has a fairly good uniformity of the output current. That is, the output currents are nearly equal under different threshold voltages. In Fig. 6, the conventional halogen drive circuit and the pixel drive lightning of Fig. 2 are used to obtain the unevenness of the output current. It can be seen from FIG. 6 that the use of the pixel driving circuit proposed in the exemplary embodiment of the present invention can greatly improve the unevenness of the output current of the driving transistor, and can be less than 4 〇/{^ here. In an exemplary embodiment of the present invention, when the transistor elements of the pixel driving circuit are all depleted transistors, the pixel circuit can operate normally and compensate for the threshold voltage variation of the driving transistor, but the invention is not limited thereto. . In other embodiments, when the electric body of the halogen drive circuit is composed of a depleted or lifted transistor, the pixel drive circuit is still 15

201203199 t/I can operate normally and compensate for the threshold voltage variation of the driving transistor. Fig. 7 is a block diagram of a pixel driving circuit according to an exemplary embodiment of the present invention. Referring to Fig. 7', in the present embodiment, the crystal element of the [Deuterium drive circuit] is, for example, a depleted or lift type transistor. The difference between the pixel drive circuit 700 of the present embodiment and the pixel drive circuit 200 of FIG. 2 is that, for example, the second drive unit 72 of the present embodiment receives a reference voltage Vref in addition to receiving the data voltage vDATA. Make sure that when driving the transistor D; for the lift type transistor, the drive transistor Τ1 can be kept in the off state during the setting period, so that the threshold voltage information of the drive transistor can be memorized in the storage capacitor CST or the set capacitor. Among the cSET. In detail, in the present embodiment, one source/drain of the transistor T4 receives the material voltage vDATA and the reference voltage vREF (Vdata+Vref). Therefore, when the control signal CH is at the high level, the transistor τ4 is turned on, thereby providing the voltage Vdata+VreF to the node η. In addition, one source/no pole of the transistor Τ5 receives only the data voltage VDATA. Therefore, under this design architecture, when the node ~ discharges during the set period, its voltage can still be higher than the data voltage VDATA, and until the voltage of the node ηι is equal to the threshold voltage vT plus the data voltage vDATA (VT+VDATA). Stop discharging. At this time, the threshold voltage information of the driving transistor 1 is memorized in the storage capacitor Cst or the set capacitor Cset. Therefore, in the present embodiment, the appropriate design allows the pixel driving circuit composed of the depletion type or the lifting type transistor element to operate normally and compensate the threshold voltage of the driving transistor. 201203199

^iyuwf.doc/I In addition, the pixel driving circuit 700 of the present embodiment is the same as or similar to the pixel driving circuit 200 of FIG. 2, and can be exemplified by the example of FIG. 2A to FIG. In the narrative, the instructions, suggestions and implementation instructions for the dog are given. In the above embodiment, the transistor elements of the pixel driving circuits 200, 700 are, for example, n-type transistors, but the present invention is not limited thereto. In other embodiments, the transistor elements of the [deuterium drive circuit may also be, for example, p-type electro-crystal bodies. - Figure 8 is a block diagram of a pixel drive circuit of an exemplary embodiment of the present invention. Figure 8 is a circuit diagram of the adjustment unit of Figure 8A. Referring to FIG. 8A and FIG. 8A, the pixel driving circuit 800 of the present embodiment is adapted to drive a light-emitting component I, which includes a first driving unit 81A, a second driving unit 820, and an adjusting unit 83. And a storage capacitor cst. Here, the adjustment unit 830 includes a set capacitor CSET and a transistor τ2 connected in series between the first driving unit 810 and the second driving unit 820. One end of the adjusting unit 830 is coupled to the gate of the driving transistor 由 by the node ηι The other end of the adjusting unit 830 is coupled to the other source/drain of the driving transistor τ1 by the node n2. Similarly, the adjusting unit 830 of the present embodiment can be used to adjust the gate voltage (i.e., the voltage called the node) of the driving electric body T!. Therefore, in the present embodiment, by the action of the adjusting unit 830, the pixel driving circuit 8 can compensate for the unevenness or drift of the threshold voltage of the driving transistor τ1 to provide a relatively uniform current of the light-emitting element D. It is worth noting that in the present embodiment, one of the adjustment units 830 17 201203199

The ?c/I terminal is connected to the cathode of the light-emitting element D via the node n2, and the anode of the light-emitting element D is coupled to the control signal VH (fifth control signal). Further, the first driving unit 810 includes a driving transistor t and a transistor A. The gate of the transistor D is controlled by the control signal EM. One source/drain of the transistor I is coupled to one source/drain of the ground (the other of the second voltage transistor a is coupled to the driving transistor). In addition, driving the transistor T! A source/drain is coupled to the cathode of the light-emitting element D via a node. The second driving unit 820 includes transistors 4 and 4. The gate of the transistor 4 is controlled by a source of the control signal CHe transistor. The drain receives the data voltage Vdata. The other source/drain of the transistor TV is coupled to the gate of the driving transistor 。. The gate of the transistor 1 is controlled by the source/drain receiving of the control signal SETe transistor A. The data voltage Vdata. The other source/drain of the transistor D is coupled to the source/drain of the driving transistor T1 and the transistor τ3. FIG. 9 is a driving sequence diagram of the control signals of the pixel driving circuit of FIG. Referring to FIG. 8A, FIG. 8A and FIG. 9, in the embodiment, the transistor elements of the pixel drive circuit 800 are both p-type transistors, and the two ends of the adjustment unit 830 are respectively connected to the nodes. Taking the driving timing of the control signal of FIG. 9 as an example, the pixel driving circuit 800 of this embodiment can be divided into the following operations. Stage: (1) Pre-charging period: First, during the pre-charging period Ρ1, 'control signals CH, VH and SET are in the right direction', so the data voltage VDATA can be set to the node ηι' via the transistor τ4 and via the light-emitting element D Power supply, the voltage of node η2 can be set to the section

201203199 34iyitwf.doc/I The voltage of point ~ is high. In addition, the control signal EM is at a low level at this stage to reduce the extra leakage path. (2) Setting period: - In the setting period P2, the control signals CH and VH are at a low level, so that the node η 1 is in a floating state, and the voltage of the node 不会 is not charged by the light-emitting element d. The control signal ΕΜ is also at a low level, thus blocking the path of the ground. In the setting period Ρ2, since the control signal SET is at a high level, the voltage is transmitted through the transistor 2 of the adjusting unit 230, and the capacitor 'and the transistor 1 body A are discharged until the voltage of the node 〜 is equal to the threshold voltage. Discharge is stopped only when (Vt+VDAtA). At this time, since the driving electric day body t is turned off, the node ~ discharge is prevented. Therefore, the threshold voltage information of the driving power is memorized in the storage capacitor cST or the set capacitance CSET. ~Electricity (3) Illumination period: Power-on = Light period: Medium 'Control signal is high level, and power is turned on 4Τ3' to lift the ground path to the light-emitting element d. In addition, the variation affects the weakly-triggered value of the voltage value of the singularity of the singularity of the voltage. In the present embodiment, even if the halogen drive is electrically, the critical electric-powered transistor that drives the transistor T1 is composed. Another rest, the gentry ^ pressure compensation function can still operate normally. Her list of elementary drive circuits _ and the prime drive of Figure 2A 19

201203199 c/I The same or similar parts of the moving circuit 2GG can be explained by the description of the exemplary embodiment of Figs. 2A to 3, and will not be described again. Similarly, in the exemplary embodiment of the present invention, when the transistor components of the pixel driving circuit are all depleted transistors, the pixel driving circuit can operate normally and compensate the driving transistor_boundary voltage variation, but the present invention Not limited to this. In other implementations, when the transistor component of the halogen drive circuit is composed of a depleted or lifted transistor, the halogen drive circuit can still operate normally and compensate for the critical voltage variation of the drive transistor. FIG. 10 is a schematic diagram of a pixel driving circuit according to an exemplary embodiment of the present invention. Please refer to _. In this implementation, except that the transistor elements are, for example, P-type transistors, the transistor elements on the surface of the halogen drive circuit are, for example, depleted or lifted transistors. The difference between the pixel drive circuit 1000 of the present embodiment and the pixel drive circuit 800 of FIG. 8A is, for example, that the second drive unit 1〇2 of the present embodiment receives a reference voltage Vref in addition to receiving the data voltage vDATA. In order to ensure that when the driving transistor Ti is a lift-type transistor, the driving transistor during the setting period can still be kept in the off state, so that the threshold voltage information of the driving transistor 1 can be memorized in the storage capacitor Cst or set. Among the capacitors Cset. Therefore, under this design architecture, when the node ~ discharges during the set period, its voltage can still be above the data voltage vdata, and stops until the voltage of the node (1) is equal to the threshold voltage ντ plus the data voltage vDATA (Vt+Vdata). Discharge. At this time, the threshold voltage information of the driving transistor ^ is memorized in the memory 20

201203199 ^Hiyuwf.doc/I Storage capacitor cST or set capacitor cSET. Therefore, in the present embodiment, the appropriate driving design allows the pixel driving circuit composed of the depletion type or the lifting type transistor element to operate normally and compensate the threshold voltage of the driving transistor. In addition, the same or similar parts of the pixel driving circuit 1000 of the present embodiment and the pixel driving circuit 800 of FIG. 8A can obtain sufficient teaching, suggestion and implementation instructions from the description of the exemplary embodiments of FIGS. 8A to 9. Therefore, I will not repeat them. FIG. 11 is a flow chart showing the steps of a method for driving a pixel in an exemplary embodiment of the present invention. Referring to FIG. 2A to FIG. 3 and FIG. 11, the pixel driving method of this embodiment includes the following steps. In step S11, the data voltage Vdata is supplied to the driving transistor by the second driving unit 220, so that the first driving unit 210 drives the light emitting element D according to the data voltage VDATA. That is, during the pre-charging period pi, the first end (node ηι) and the second end (node n2) of the adjusting unit 230 are respectively charged to the data voltage VDATA and the high-level voltage Vdd. In step S1.102, the gate voltage of the driving transistor t is adjusted by the adjusting unit 230. That is, during the set period p2, the first end of the adjusting unit 230 is discharged by the second driving early element 220 and the adjusting unit 230' to compensate for the threshold voltage value of the driving transistor 1. In step S1104, the light-emitting element D is driven by the first driving unit 21A. That is, during the light-emitting period P3, the driving transistor 开启 is turned on in accordance with the threshold voltage value of the driving transistor 记 remembered by the set capacitance CsET to drive the light-emitting element D by the high-level voltage Vdd. 21 201203199 In addition, the pixel driving method of the embodiment of the present invention can obtain sufficient teachings and suggestions from the description of the exemplary embodiments of FIGS. 2a to 10, and therefore will not be described again. In summary, in an exemplary embodiment of the present invention, the pixel drive circuit and the pixel drive method can be used to compensate for the drift of the threshold voltage of the drive transistor to provide a relatively uniform current of the light-emitting element. In addition, in the exemplary embodiment of the present invention, the threshold voltage compensation function of the driving transistor can be positively applied regardless of the type of the bear drive circuit. Although the present invention has been disclosed in the above embodiments, it is not It is used to define the knowledge of any technical field in the technical field. If you do not invent the area, you can make some changes and retouching. Prevail. [Simple description of the map] Road. Fig. 1 is a circuit diagram of the adjustment unit of Fig. 2A. Fig. 2B is a circuit diagram of the adjustment unit of Fig. 2A. FIG. 3 is a driving diagram of the control signals of the pixel driving circuit of FIG. 2A. The output current of the pixel driving circuit is the data current dust. FIG. 5 is the output current of the pixel driving circuit of FIG. 2A. For the data voltage 22 201203199 34iyitwf.doc / I diagram. Fig. 6 is a graph showing the comparison of the uniformity of the output current of the pixel driving circuit of Fig. 2A and the conventional pixel driving circuit. Figure 7 is a block diagram of a pixel drive circuit in accordance with an exemplary embodiment of the present invention. FIG. 8A is a block diagram of a pixel driving circuit according to an exemplary embodiment of the present invention. FIG. 8B is a circuit diagram of the adjusting unit of FIG. 8A. ® Figure 9 is a drive timing diagram of the control signals of the pixel drive circuit of Figure 8A. FIG. 10 is a block diagram of a pixel driving circuit according to an exemplary embodiment of the present invention. FIG. 11 is a flow chart showing the steps of a pixel driving method according to an exemplary embodiment of the present invention. [Main component symbol description] #200, 700, 800, 1000: The pixel drive circuit 210, 710, 810, 1〇1〇: the first drive unit 220, 720, 820, 1020: the second drive unit 230, 730, 830, 1030: adjustment unit D2~T5 · Transistor SW1~SW3: Switching transistor DTFT, 1: Driving transistor CSET: Setting capacitor 23

201203199 c/I cST: storage capacitor OLED: organic light-emitting diode D: light-emitting element

Vdata: data voltage VT: threshold voltage

Vref: reference voltage

Vdd · Voltage ηι, Π2: Nodes £M, CH, SET, VL, VH: Control signal · TNO, SLT, CTD, DT: Signal P1: Precharge period P2: Set period P3: Illumination period Ή, T2: Period S1100 , S1102, S1104: Alizarin driving method step 24

Claims (1)

201203199 iyixwf.doc/I VII. Patent application: 1. A pixel drive circuit suitable for driving a light-emitting component, the halogen drive circuit comprising: a first drive unit for driving the light-emitting component, wherein The first driving unit includes a first transistor; a second driving unit is configured to provide a data voltage to the first transistor, so that the first driving unit drives the light emitting component according to the data voltage; and an adjusting unit The adjusting unit includes a set capacitor and a second transistor, and the set capacitor is coupled in series with the second transistor to the first driving unit and the Between the second drive units. 2. The pixel drive circuit of claim 1, wherein the set capacitor is used to adjust a gate voltage of the first transistor. 3. The pixel driving circuit of claim 1, further comprising a storage capacitor coupled between the first driving unit and the second driving unit for storing the data voltage at the first One of the gates of the transistor. 4. The pixel driving circuit of claim 1, wherein the first driving unit further comprises: a third transistor having a gate, a first source/drain, and a second source/ a gate, wherein the gate of the third transistor is controlled by a first control signal, the first source/drain of the third transistor is coupled to a first voltage, and the third transistor The second source/drain is coupled to one of the first source/drain of the first transistor, wherein one of the first transistors is coupled to the second source/drain 25 201203199 』=== And the second end of the light-emitting element consumes the first: the second application package: the halogen drive circuit of the fourth item, wherein the fourth transistor has a gate, and the pole The gate of the fourth transistor is subjected to two = and (four) second == first-source_connected_====: the second source of the body, 汲_ is connected to the first transistor a fifth transistor having a pole, a source/drain pole, wherein the fifth transistor is a gate: a pole and a pole; and the second is the first one of the fifth transistor 4= Zhao's second source (4) is connected to the first-electric two-^. The adjustment element has a first-end and a second end, and the adjustment gate 7L is connected to the gate of the first-electrode The two ends are coupled to the first transistor. Early 7" The sinusoidal driving circuit of claim 5, wherein: the pre-charging fine n control, the second control signal, the second control signal, and the fourth control signal are at a high level; During a set period, the first control signal and the third control signal are at a low level, and the second control signal and the fourth control signal are at a high level; and during a lighting period, the first control signal is high The second control signal, the third control signal, and the fourth control signal are at a low level. 26 f.doc/I 201203199 J*T 1 JA WVY 7. The pixel drive circuit of claim 5, wherein the first transistor, the second transistor, the third transistor, the The fourth transistor and the fifth transistor comprise at least one depletion transistor. 8. The pixel drive circuit of claim 5, wherein the first source/drain of the fourth transistor further receives a reference voltage. 9. The pixel driving circuit of claim 1, wherein the first driving unit further comprises: a third transistor having a gate, a first source/no pole, and a second source/ a gate, wherein the gate of the third transistor is controlled by a first control signal, and the second source/drain of the third transistor is coupled to a second voltage, wherein one of the light-emitting elements The first end is coupled to a second control signal, and the second end of the light emitting element is coupled to one of the first source/drain of the first transistor, and the second source/drain of the first transistor The first source/no pole is coupled to the third transistor. 10. The pixel driving circuit of claim 9, wherein the second driving unit comprises: a west transistor having a gate, a first source/drain, and a second source/汲a pole, wherein the gate of the fourth transistor is controlled by a third control signal, the first source/drain of the fourth transistor receives the data voltage, and the second source of the fourth transistor The gate is coupled to the gate of the first transistor; and a fifth transistor having a gate, a first source/no electrode, and a second source/drain, wherein the fifth transistor The gate is controlled by a fourth control signal, the first source/drain of the fifth transistor receives the data voltage, and the source of the 201202199 5^/= body The first end of the first cell of the first transistor and the second end of the cell are the pixel driving circuit of the first embodiment of the present invention. The control signal, the signal is a low level 'and the second in-setting, saying that the fourth control signal is a high level; (d) the first - (four), the second control signal and the first: during the lighting period and the fourth control signal is a high level; and the bit, i whistle: Sx a control signal and the second control signal is a high standard t The second control of the difference is the fourth control of the county low level. The halogen driving circuit according to Item 10 of the above, wherein the electro-optical transistor, the third transistor, the fourth electrode body and the fifth transistor comprise at least a depletion transistor . The green potential is the halogen drive circuit as described in item 10 of the patent scope of the invention, and the first source/no pole of the U-four transistor receives the reference voltage. Go to s^4. The multi-denier driving method is suitable for the pixel driving circuit, the second-dynamic circuit uses (four) moving-light-emitting elements, and the halogen (four) circuit package ^ drive; = element, a second driving unit And an adjustment unit, wherein the pixel drives the light emitting element by a first driving unit, wherein the first driving element comprises a first transistor; and the first driving unit provides a data voltage to the first晶晶28 rf.doc/I 201203199 5 The first driving unit adjusts the gate voltage of the first transistor according to the (four) voltage crane, and adjusts the gate voltage of the first transistor, wherein the adjustment is early and purely And the second transistor is coupled in series with the yoke unit of the swaying unit, and the singularity of the singularity of the second squirrel:==4, the constant capacitance, the L=:: r电;, 'With the halogen driving method described in the item 14 of the Lifan 11th, the first driving unit and the driving; J electric: the storage coupling of the storage capacitor further includes: Between, the halogen driving method - the gate is stored by the storage capacitor 'the data voltage in the first - transistor 17. As for the patent application In the 14th, the adjusting unit has a first-stage J" prime driving method, which is pressed to the first knowledge of the first transistor, and the first voltage is respectively provided during the second power supply period of the second power supply. The first step is to charge the data voltage and the halogen driving method described in item 17 of the second and second ranges, in the step of ^^: the gate voltage of the Japanese body, in a certain step The second driving unit and the adjusting unit enable the adjusting unit to 'compensate' the threshold voltage of the first transistor. 29 201203199 c/I 19. The method of driving the halogen as described in claim 18 In the step of driving the light-emitting element, during a light-emitting period, the first transistor is turned on according to the threshold voltage value of the first transistor memorized by the set capacitance, to drive the first voltage by the first voltage. 20. A halogen driving method according to claim 14, wherein in the step of providing the data voltage to the first transistor, a reference voltage is further supplied to the first transistor. 30