TWI734463B - Pixel driving device having test function - Google Patents

Abstract

A pixel driving device having test function includes pixel driving circuits configured to receive a first scan signal, a second scan signal and a light emitting signal to perform a first test. One of the pixel driving circuits includes switches configured to receive at least one test signal to ensure whether the switches being turned on normally and being turned off normally according to the first scan signal, the second scan signal and the light emitting signal when the first test is performed, and an accommodating space configured to accommodate a light emitting element after the first test is performed, such that the light emitting element is coupled to the pixel driving circuit.

Description

Pixel driving device with detection function

The present invention relates to a display technology, in particular to a driving device for a display panel.

The pixel driving circuit on the substrate of the display panel may be abnormal due to metal residue and excessive etching during the manufacturing process. The manufacturing process of light-emitting elements such as micro-light-emitting diodes is complicated, resulting in higher costs. In addition, the current in the current pixel driving circuit may be affected by the switching characteristics and cause brightness differences. Therefore, how to develop related technologies that can overcome the above-mentioned problems is an important issue in this field.

The embodiment of the present invention includes a pixel driving device with detection function, which includes a plurality of pixel driving circuits. The plurality of pixel driving circuits are used to sequentially receive a first scan signal, a second scan signal, and a light emitting signal to perform a first detection. The plurality of pixel driving circuits include a pixel driving circuit, and the pixel driving The circuit includes a plurality of switches and an accommodating space. A plurality of switches are used for receiving at least one detection signal to confirm the plurality of Whether the switch is normally turned on or normally closed according to the first scan signal, the second scan signal, and the light-emitting signal. The accommodating space is used for accommodating a light-emitting element after the first detection is completed, so that the light-emitting element is coupled to the pixel driving circuit.

100: display panel

110: display device

120: Scanning device

130: data input device

140: Light-emitting device

SL(1)~SL(n+1): scan line

S1, S2: scan signal

DL(1)~DL(m): data line

D1: Data signal

EL(1)~EL(n): luminous line

EM: Luminous signal

112, 112', 112": pixel drive circuit

L1: Light-emitting element

210: reset unit

220: data write unit

230: compensation unit

240: light-emitting unit

SS, DD: voltage signal

VA, VB: node voltage

RF1, RF2: Reference signal

201, 211, 213, 221, 223, 231, 233, 241, 243, 245: nodes

V _TH : Threshold voltage level

VSS, VDD, VR1, VR2, VD1: voltage level

ΔV: voltage level change

I: current

T1~T7: switch

C1: Capacitance

P31~P33, P51, P71, P91: stage

VGH: enable voltage level

VGL: disable voltage level

401: accommodating space

410, 420, 610, 810, 820, 1010: conduction path

Figure 1 is a schematic diagram of a display panel according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a pixel driving circuit in a display device according to an embodiment of the present invention.

FIG. 3 is a timing diagram of the driving operation of the pixel driving circuit according to an embodiment of the present invention.

FIG. 4 is a circuit operation diagram of the pixel driving circuit in the display device according to an embodiment of the present invention.

FIG. 5 is a timing diagram of the detection operation performed by the pixel driving circuit according to an embodiment of the present invention.

FIG. 6 is a circuit operation diagram of the pixel driving circuit in the display device according to an embodiment of the present invention.

FIG. 7 is a timing diagram of the detection operation performed by the pixel driving circuit according to an embodiment of the present invention.

FIG. 8 is a circuit operation diagram of the pixel driving circuit in the display device according to an embodiment of the present invention.

Figure 9 shows the pixel driving circuit according to an embodiment of the present invention. The timing chart of the line detection operation.

FIG. 10 is a circuit operation diagram of the pixel driving circuit in the display device according to an embodiment of the present invention.

In this text, when a component is referred to as “connected” or “coupled”, it can be referred to as “electrically connected” or “electrically coupled”. "Connected" or "coupled" can also be used to mean that two or more components cooperate or interact with each other. In addition, although terms such as “first”, “second”, etc. are used herein to describe different elements, the terms are only used to distinguish elements or operations described in the same technical terms. Unless the context clearly indicates, the terms do not specifically refer to or imply order or sequence, nor are they used to limit the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of related technologies and the present invention, and will not be interpreted as idealized or excessive The formal meaning, unless explicitly defined as such in this article.

The terminology used here is only for the purpose of describing specific embodiments and is not restrictive. As used herein, unless the content clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms, including "at least one." "Or" means "and/or". As used herein, the term "and/or" includes one or more related listed items Any and all combinations of purpose. It should also be understood that when used in this specification, the terms "including" and/or "including" designate the presence of the features, regions, wholes, steps, operations, elements, and/or components, but do not exclude one or more The existence or addition of other features, regions as a whole, steps, operations, elements, components, and/or combinations thereof.

Hereinafter, multiple implementation modes of this case will be disclosed in schematic form. For the sake of clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the case. That is to say, in some implementations of the present disclosure, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventionally used structures and elements are shown in the drawings in a simple and schematic manner.

Figure 1 is a schematic diagram of a display panel according to an embodiment of the present invention. Please refer to FIG. 1, the display panel 100 includes a display device 110, a scanning device 120, a data input device 130 and a light emitting device 140. The scanning device 120 provides a plurality of scanning signals, such as the scanning signal S1 and the scanning signal S2 in FIG. 2, to the display device 110 through the scanning lines SL(1)-SL(n+1). The data input device 130 provides a plurality of data signals, such as the data signal D1 in FIG. 2, to the display device 110 through the data lines DL(1)-DL(m). The light-emitting device 140 provides a plurality of light-emitting signals, such as the light-emitting signal EM in FIG. 2, to the display device 110 through the light-emitting lines EL(1)-EL(n). Wherein n and m are both positive integers. In some embodiments, the display panel 100 may be made of a glass substrate or a plastic substrate, but is not limited thereto.

As shown in Figure 1, the display device 110 includes multiple stages connected in series with each other The pixel driving circuits DV(1)~DV(n) of, including the pixel driving circuit 112. In some embodiments, the pixel driving circuit 112 in the display device 110 performs a light-emitting operation according to the signals provided by the scanning device 120, the data input device 130, and the light-emitting device 140.

For example, as shown in FIG. 2, the pixel driving circuit 112 resets the pixel driving circuit 112 by the scan signal S1 provided by the scanning device 120, and writes the data input by the scan signal S2 provided by the scanning device 120 The data signal D1 provided by the device 130, wherein the voltage level of the data signal D1 determines the light-emitting intensity of the light-emitting element L1, and finally the light-emitting signal EM provided by the light-emitting device 140 controls the light-emitting time length of the light-emitting element L1.

In some embodiments, the scan signal S1 and the scan signal S2 are respectively transmitted to the pixel driving circuit 112 through the scan line SL(n) and the scan line SL(n+1), and the data signal D1 is transmitted to the pixel driving circuit 112 through the data line DL(m). In the pixel driving circuit 112, the light-emitting signal EM is transmitted to the pixel driving circuit 112 through the light-emitting line EL(n), but the embodiment of the present invention is not limited to this. The scan signal S1, the scan signal S2, the data signal D1, and the data signal D1 are transmitted through other various wires. The manner in which the light-emitting signal EM is sent to the pixel driving circuit 112 is also within the scope of the present invention.

FIG. 2 is a circuit diagram of a pixel driving circuit in a display device according to an embodiment of the present invention. Please refer to FIG. 2, which is a circuit diagram of the pixel driving circuit 112 in the display device 110. In some embodiments, the pixel driving circuit 112 includes a reset unit 210, a data writing unit 220, a compensation unit 230, and a light emitting unit 240.

In some embodiments, the reset unit 210 is used to turn on according to the scan signal S1, and pull down the node voltage VA of the node 221 according to the voltage signal SS when it is turned on, and pull up the node voltage VB of the node 201 according to the reference signal RF1 to reset Node voltage VA and node voltage VB. The data writing unit 220 is turned on according to the scan signal S2, and writes the data signal D1 to the node 221 when it is turned on. The compensation unit 230 is used for turning on according to the scan signal S2, and pulls down the node voltage VB of the node 201 _{according to the voltage level VSS of the voltage signal SS and the threshold voltage level V TH of the switch T6 when it is turned on.} The light emitting unit 240 is turned on according to the light emitting signal EM, and when it is turned on, the node voltage VA of the node 221 is increased according to the reference signal RF2 and the current I from the compensation unit is received, and emits light according to the current level of the current I.

In some embodiments, the reset unit 210 includes a switch T3 and a switch T5, and the control terminal of the switch T3 and the control terminal of the switch T5 are both used to receive the scan signal S1. One end of the switch T3 is used to receive the voltage signal SS at the node 211, and the other end of the switch T3 is coupled to the node 221. One end of the switch T5 is used to receive the reference signal RF1 at the node 213, and the other end of the switch T5 is coupled to the node 201.

In some embodiments, the data writing unit 220 includes a switch T1 and a capacitor C1. The control end of the switch T1 is used to receive the scan signal S2, one end of the switch T1 is used to receive the data signal D1 at the node 223, and the other end of the switch T1 is coupled to the node 221. One end of the capacitor C1 is coupled to the node 221, and the other end of the capacitor C1 is coupled to the node 201. The capacitor C1 is used to transmit the data signal D1 from the data writing unit 220 to the compensation unit 230.

In some embodiments, the compensation unit 230 includes a switch T4 and a switch T6. The control end of the switch T4 is used to receive the scan signal S2, one end of the switch T4 is coupled to the node 201, and the other end of the switch T4 is coupled to the node 231. The control end of the switch T6 is coupled to the node 201, one end of the switch T6 is used to receive the voltage signal SS at the node 233, and the other end of the switch T6 is coupled to the node 231.

In some embodiments, the light-emitting unit 240 includes a light-emitting element L1, a switch T2, and a switch T7. The control end of the switch T2 is used to receive the light-emitting signal EM, one end of the switch T2 is coupled to the node 221, and the other end of the switch T2 is used to receive the reference signal RF2 at the node 241. The control end of the switch T7 is used to receive the light-emitting signal EM, one end of the switch T7 is coupled to the node 231, and the other end of the switch T7 is coupled to the node 243. One end of the light-emitting element L1 is coupled to the node 243, the other end of the light-emitting element L1 is coupled to the node 241, and the node 241 is used to receive the voltage signal DD.

In different embodiments, the light emitting element L1 may be a micro light emitting diode (mLED) or other different types of light emitting elements. In different embodiments, the switches T1 to T7 can be P-type metal oxide semiconductor field effect transistors (PMOS), N-type metal oxide semiconductor field effect transistors (NMOS), thin film transistors (TFT), or other types. Different types of switching elements.

FIG. 3 is a timing diagram of the driving operation of the pixel driving circuit according to an embodiment of the present invention. The timing diagram shown in FIG. 3 includes phase P31, phase P32, and phase P33 in sequence.

In phase P31, the scan signal S1 has the enable voltage level VGH turns on the switch T3 and the switch T5. At this time, the switch T3 provides the voltage signal SS to the node 221, and the voltage signal SS has the voltage level VSS, so that the node voltage VA of the node 221 has the voltage level VSS. At this time, the switch T5 provides the reference signal RF1 to the node 201, and the reference signal RF1 has the voltage level VR1, so that the node voltage VB of the node 201 has the voltage level VR1. At this time, the capacitor C1 stores the charge from the reference signal RF1, so that the voltage level of the node voltage VB can be maintained at an enabling voltage level sufficient to turn on the switch T6 after the switch T5 is turned off.

In some embodiments, during the period P31, the node voltage VA and the node voltage VB of the pixel driving circuit 112 are reset, so that the pixel driving circuit 112 can prepare to receive the data signal D1, so the phase P31 is called the reset phase.

In phase P32, the scan signal S2 has the enable voltage level VGH, so that the switch T1 and the switch T4 are turned on. At this time, the switch T1 writes the data signal D1 into the node 221 so that the node voltage VA of the node 221 has the voltage level VD1 of the data signal D1. The charge stored in the capacitor C1 in the phase P31 makes the node voltage VB still have the enable voltage level in the phase P32, so the switch T6 is turned on in the phase P32. The switch T4 and the switch T6 are both turned on, so that the voltage level of the node voltage VB is pulled down to (VSS+V _TH ) by the voltage signal SS, where the voltage level VSS is the voltage level of the voltage signal SS, and the threshold voltage level V _TH is The threshold voltage level of switch T6.

In some embodiments, in stage P32, the data signal D1 is written into the pixel driving circuit 112, and the voltage level of the node voltage VB is adjusted to (VSS+V _TH ) to prepare for compensation during the light-emitting stage (for example, stage P33) The threshold voltage level of the switch T6 is V _TH . Therefore, stage P32 is called the data writing and compensation stage.

In some embodiments, in the stage P31, the switch T3 pulls the node voltage VA of the node 221 to the voltage level VSS, where the voltage level VSS is lower than the voltage level VD1 of the data signal D1, so that the data signal D1 is written in the stage P32 When entering, the voltage level of the node voltage VB will be correctly adjusted to (VSS+V _TH ).

In phase P33, the light-emitting signal EM has the enable voltage level VGH, so that the switch T2 and the switch T7 are turned on. At this time, the switch T2 provides the reference signal RF2 to the node 221, and the reference signal RF2 has the voltage level VR2, so that the voltage level of the node voltage VA of the node 221 is pulled from the voltage level VD1 of the stage P32 to the voltage level VR2. The voltage level change ΔV of the node voltage VA from the stage P32 to the stage P33 is (VR2-VD1). At this time, the capacitor C1 uses the node voltage VA to pull the voltage level of the node voltage VB from (VSS+V _TH ) at the stage P32 to the voltage level ((VSS+V _TH )+ΔV), that is, (VSS+V _TH -VD1+VR2).

In some embodiments, the voltage level VR1 is greater than or equal to the voltage level VR2, but the embodiment of the present invention is not limited thereto.

In some embodiments, in the phase P33, the switch T7 is turned on so that the current I can flow from the node 245 to the node 233 through the node 243 and the node 231. The node 245 receives the voltage signal DD having the voltage level VDD, where the voltage level VDD is higher than the voltage level VSS of the node 233, So that the absolute value of the current level of the current I can be greater than zero. In some embodiments, the current level of the current I can determine the luminous intensity of the light-emitting element L1.

In some embodiments, the difference between the gate voltage level and the source voltage level of the switch T6, that is, the difference between the voltage level of the node 201 and the voltage level of the node 233, is set to VGS, through the electronic The formula shows that the current level of the current I through the switch T6 is K×(VGS-V _TH ). In phase P33, bring (VSS+V _TH -VD1+VR2) into the voltage level of node 201, and bring VSS into the voltage level of node 201, and the current level of current I can be obtained as K× (VR2-VD1), where K is a constant. Therefore, the current level of the current I _{has nothing to do with the threshold voltage level V TH} , but is related to the voltage level VD1 of the data signal D1.

In some embodiments, in the stage P33, the luminous intensity of the light-emitting element L1 is determined by the current level of the current I. Through the operations described in the stage P31, the stage P32, and the stage P33, the value of the threshold voltage level V _TH does not affect the luminous intensity of the light-emitting element L1. The luminous intensity of the light-emitting element L1 depends on the voltage level VD1 of the data signal D1.

In some embodiments, in the phase P33, the light-emitting element L1 in the pixel driving circuit 112 emits light, so the phase P33 is referred to as the light-emitting phase.

In the previous practice, when the detection signal is provided to the display panel 100 to test whether the display device 110 is abnormal, the light-emitting element L1 is already coupled to the display device 110. At this time, the manufacturing cost of the display panel 100 includes the manufacturing cost of the light-emitting element L1.

Compared with the above-mentioned method, the embodiment of the present invention provides a method that can be used in The light-emitting element L1 is coupled to the pixel driving circuit 112 ′ that performs detection before the display device 110, as shown in FIG. 4. The pixel driving circuit 112 ′ is a pixel driving circuit 112 that is not yet coupled to the light-emitting element L1, so the cost of the pixel driving circuit 112 ′ is lower than the manufacturing cost of the pixel driving circuit 112.

FIG. 4 is a circuit operation diagram of the pixel driving circuit in the display device according to an embodiment of the present invention. The difference between the pixel driving circuit 112 ′ shown in FIG. 4 and the pixel driving circuit 112 shown in FIG. 2 is that the pixel driving circuit 112 ′ has an accommodation space 401 coupled between the node 245 and the node 243. The accommodating space 401 can be used for accommodating the light-emitting element L1, so that the light-emitting element L1 is coupled to the pixel driving circuit 112'.

FIG. 5 is a timing diagram of the detection operation performed by the pixel driving circuit according to an embodiment of the present invention. The timing diagram shown in Figure 5 includes phase P51. In stage P51, a detection of the pixel driving circuit 112' is performed.

Referring to FIGS. 4 and 5, in stage P51, the scan signal S1 and the scan signal S2 have the enable voltage level VGH, so that the switch T1, the switch T3, the switch T4, and the switch T5 are turned on. The light-emitting signal EM has the disable voltage level VGL, so that the switch T2 and the switch T7 are closed. At this time, starting from node 213, passing through node 201 and node 231 to node 233, a conduction path 410 is formed, and starting from node 211, passing through node 221 to node 223, a conduction path 420 is formed.

In some embodiments, in phase P51, the reference signal RF1 is provided to the node 213 for detection. If the reference signal RF1 can be transmitted from the node 213 to the node 233, it indicates that the switch on the conduction path 410 T5, switch T4 and switch T6 can be turned on normally. Similarly, the voltage signal SS is provided to the node 211 for detection. If the voltage signal SS can be transmitted from the node 211 to the node 223, it means that the switch T3 and the switch T1 on the conduction path 420 can be normally turned on. At this time, since the switch T2 is closed, the voltage level of the node 241 should be a floating voltage level and will not be affected by the voltage signal SS. If the voltage level of the node 241 is a floating voltage level, it means that the switch T2 can be normally closed.

FIG. 6 is a circuit operation diagram of the pixel driving circuit in the display device according to an embodiment of the present invention. The pixel driving circuit 112' shown in FIG. 6 is the same as the pixel driving circuit 112' shown in FIG. The difference between Fig. 6 and Fig. 4 is the switch that is turned on, as described below.

FIG. 7 is a timing diagram of the detection operation performed by the pixel driving circuit according to an embodiment of the present invention. The timing diagram shown in Figure 7 includes phase P71. In stage P71, a detection of the pixel driving circuit 112' is performed.

Referring to FIGS. 6 and 7, in stage P71, the light-emitting signal EM and the scan signal S2 have the enable voltage level VGH, so that the switch T1, the switch T2, the switch T4, and the switch T6 are turned on. The scan signal S1 has the disable voltage level VGL, so that the switch T3 and the switch T5 are closed. At this time, starting from the node 241, passing through the node 221 to the node 223, a conduction path 610 is formed.

In some embodiments, in stage P71, the reference signal RF2 is provided to the node 241 for detection. If the reference signal RF2 can be transmitted from the node 241 to the node 223, it indicates that the switch on the path 610 is turned on T1 and switch T2 can be turned on normally. In addition, the voltage signal SS is provided to the node 233 for detection. At this time, since the switch T5 is closed and the reference signal RF1 cannot pass through the switch T5, the voltage level of the node 213 should be a floating voltage level and will not be affected by the voltage signal SS. If the voltage level of the node 213 is a floating voltage level, it means that the switch T5 can be normally closed.

FIG. 8 is a circuit operation diagram of the pixel driving circuit in the display device according to an embodiment of the present invention. The pixel driving circuit 112' shown in FIG. 8 is the same as the pixel driving circuit 112' shown in FIG. The difference between Fig. 8 and Fig. 4 is the switch that is turned on, as described below.

FIG. 9 is a timing diagram of a detection operation performed by the pixel driving circuit according to an embodiment of the present invention. The timing diagram shown in Figure 9 includes phase P91. In stage P91, a detection of the pixel driving circuit 112' is performed.

Referring to FIG. 8 and FIG. 9, in stage P91, the light-emitting signal EM, the scan signal S1, and the scan signal S2 have the enable voltage level VGH, so that the switches T1 to T7 are all turned on. At this time, starting from the node 213, passing through the node 201 and the node 231 to the node 233 form a conduction path 810, and starting from the node 211, passing through the node 221 to the node 223 and the node 241 form a conduction path 820.

In some embodiments, in phase P91, the reference signal RF1 is provided to the node 213 for detection. If the reference signal RF1 can be transmitted from the node 213 to the node 233, it means that the switch T5, the switch T4, and the switch T6 on the conduction path 810 can be normally turned on. In addition, the voltage signal SS is provided to the node 211 for detection. If the voltage signal SS can The transmission from the node 211 to the nodes 223 and 241 means that the switch T3, the switch T1, and the switch T2 on the conduction path 810 can be normally turned on.

In some embodiments, in phase P51, phase P71, or phase P91 described in FIGS. 4-9, a signal may also be provided to a node of the conduction path that is different from the above-mentioned embodiment for detection. For example, referring to Figures 4 and 5, at stage P51, the voltage signal SS can also be provided to the node 233, and the voltage level of the node 213 is measured to be the voltage level VSS of the voltage signal SS to confirm Whether the switch T5, the switch T4 and the switch T6 are normally turned on.

In some embodiments, in each stage, the voltage level of each node is measured by an oscilloscope for detection. For example, in stage P51, the voltage level of the node 241 is measured by an oscilloscope to confirm whether the voltage level of the node 241 is a floating voltage level. For another example, in stage P51, the voltage level of the node 233 is measured by an oscilloscope to confirm whether the voltage level of the node 233 is the voltage level VR1 of the reference signal RF1.

In some embodiments, the inspection described in FIGS. 4-9 is called an array test, and only the substrate of the display panel 100 is inspected.

FIG. 10 is a circuit operation diagram of the pixel driving circuit in the display device according to an embodiment of the present invention. The difference between the pixel driving circuit 112" shown in FIG. 10 and the pixel driving circuit 112' shown in FIG. 4 is that in the pixel driving circuit 112", the light emitting element L1 is coupled in the accommodating space 401, That is, it is coupled between the node 245 and the node 243.

The operation of the embodiment shown in Fig. 10 is similar to that shown in Fig. 9 The operation of the stage P91, that is, the light-emitting signal EM, the scan signal S1, and the scan signal S2 have the enable voltage level VGH, so that the switches T1 to T7 are all turned on. At this time, starting from node 245, passing through node 243 and node 231 to node 201 and node 233, a conduction path 1010 is formed.

In some embodiments, in the operation of the embodiment shown in FIG. 10, the voltage signal SS and the voltage signal DD are provided to the node 233 and the node 245, respectively. At this time, the current I passes through the light-emitting element L1 to cause the light-emitting element L1 to emit light. If the light-emitting element L1 emits light correctly, it means that the switch T7 is normally turned on and the light-emitting element L1 is not abnormal. In some embodiments, the abnormality of the light-emitting element L1 may be caused by a welding condition.

In some embodiments, the test described in Figure 10 is called a cell test. Pixel detection is different from array detection. It not only detects the substrate of the display panel 100, but also detects the light-emitting element soldered on the display panel 100, such as the light-emitting element L1.

In some embodiments, the array detection described in FIGS. 4-9 occurs before the light-emitting element L1 is soldered to the display panel 100. The pixel detection described in FIG. 10 occurs after the light-emitting element L1 is soldered to the display panel 100. Since the pixel drive circuit 112' has fewer light-emitting elements L1 than the pixel drive circuit 112", the manufacturing cost of the pixel drive circuit 112' is lower than that of the pixel drive circuit 112". The array inspection is performed to confirm that the display panel 100 is not abnormal, and then the light-emitting element L1 is soldered to the display panel 100 to save manufacturing costs.

Please refer to FIG. 1. In some embodiments, the pixel driving circuits in the display panel 100 can be inspected sequentially. For example, first scan Line SL(1), data line DL(m) and light-emitting line EL(1) transmit signals to the pixel drive circuit DV(1) for detection, and then pass through the scan line SL(2), data line DL(m) and light-emitting The line EL(2) transmits the signal to the pixel drive circuit DV(2) for detection. In some embodiments, multiple pixel driving circuits in the display panel 100 can also be tested at the same time. For example, the scanning line SL(1)~SL(n), the data line DL(m), and the light-emitting line EL(1)~EL(n) transmit signals to the pixel drive circuit DV(1)~DV(n) at the same time. Perform testing. The various detection sequences of the pixel driving circuits in the display panel 100 are all within the scope of this case.

To sum up, in the embodiment of the present invention, when the light-emitting element L1 emits light, the threshold voltage level V _{TH of the} switch T6 is compensated, so that the value of the threshold voltage level V _TH does not affect the luminous intensity of the light-emitting element L1. In addition, the pixel driving circuit 112' has a plurality of conduction paths for detection. There are independent conduction paths on both sides of the capacitor C1, such as the conduction path 410 and the conduction path 420. In addition, the pixel driving circuit 112' can perform detection before coupling to the light-emitting element L1, thereby reducing the manufacturing cost.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

S1, S2: scan signal

D1: Data signal

EM: Luminous signal

112: Pixel drive circuit

L1: Light-emitting element

210: reset unit

220: data write unit

230: compensation unit

240: light-emitting unit

SS, DD: voltage signal

VA, VB: node voltage

RF1, RF2: Reference signal

201, 211, 213, 221, 223, 231, 233, 241, 243, 245: nodes

I: current

T1~T7: switch

C1: Capacitance

Claims (7)

A pixel driving device with detection function includes: a plurality of pixel driving circuits for sequentially receiving a first scanning signal, a second scanning signal and a light-emitting signal to perform a first detection; The pixel driving circuit includes a pixel driving circuit, and the pixel driving circuit includes a plurality of switches for receiving at least one detection signal when performing the first detection to confirm whether the plurality of switches are based on the first scanning signal, the The second scanning signal and the light-emitting signal are normally turned on or normally off; and an accommodating space is used for accommodating a light-emitting element after the first detection is completed, so that the light-emitting element is coupled to the pixel driving circuit. The pixel driving device according to claim 1, wherein the plurality of switches include: a first switch for turning on or off according to the first scan signal, and a first terminal of the first switch is coupled to a capacitor A first terminal; a second switch for turning on or off according to the first scan signal; a first terminal of the second switch coupled to a second terminal of the capacitor; a third switch for turning on or off according to the The second scanning signal is turned on or off, a first terminal of the third switch is coupled to the second terminal of the capacitor; and a fourth switch is used to turn on or off according to a voltage level of the second terminal of the capacitor , A first end of the fourth switch is coupled to a second end of the third switch. The pixel driving device according to claim 2, wherein the more The switch further includes: a fifth switch for turning on according to the light-emitting signal, a first end of the fifth switch is coupled to the second end of the third switch, and a second end of the fifth switch is coupled to The accommodating space; wherein when the light-emitting element is coupled to the pixel driving circuit, and the second scan signal and the light-emitting signal have a consistent voltage level, the third switch, the fourth switch, the fifth The switch and the light-emitting element form a conduction path to perform a second test to confirm whether the conduction path is normally conducted. The pixel driving device according to claim 2, wherein the plurality of switches further include: a fifth switch for turning on according to the second scan signal, and a first end of the fifth switch is coupled to the first switch When the first scan signal and the second scan signal have a uniform voltage level and the light-emitting signal has a disable voltage level, the first switch and the fifth switch form a first end A conduction path, and the second switch, the third switch and the fourth switch form a second conduction path. The pixel driving device according to claim 4, wherein the first conduction path is used for receiving a first signal of the at least one detection signal to perform the first detection, and the second conduction path is used for receiving the at least one detection signal. A second signal among the signals is detected to perform the first detection. The pixel driving device according to claim 4, wherein the more The switch further includes: a sixth switch for turning on according to the light-emitting signal, a first terminal of the sixth switch is coupled to the first terminal of the first switch, wherein when the light-emitting signal and the second scan signal When the first scan signal has a uniform voltage level and the first scan signal has a disable voltage level, the fifth switch and the sixth switch form a third conduction path. The pixel driving device according to claim 6, wherein when the first scan signal, the second scan signal, and the light-emitting signal have a consistent voltage level, the first switch, the fifth switch, and the sixth switch The switch forms a fourth conduction path, and the second switch, the third switch and the fourth switch form a fifth conduction path.

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