TWI854715B - Pixel circuit, OLED display device, and information processing device - Google Patents

Abstract

The present invention mainly discloses a pixel circuit, which is used to form an OLED pixel unit with an OLED element, and includes: a data drive unit, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, and a storage capacitor. In particular, the present invention uses three TFT elements to form the data drive unit, two TFT elements to form the first switch unit, one TFT element as the second switch unit, one TFT element as the third switch unit, and one TFT element as the fourth switch unit. According to this design, the pixel circuit of the present invention has a Vth compensation function, thereby improving the phenomenon of uneven screen display caused by inconsistent Vth between TFT elements. At the same time, the pixel circuit of the present invention can also effectively avoid the phenomenon of uneven screen brightness caused by ELVDD drop.

Description

Pixel circuit, OLED display device and information processing device

The present invention relates to the technical field of OLED display devices, and more particularly to a pixel circuit used to form an OLED pixel unit with an OLED element.

It is known that flat panel displays include non-self-luminous flat panel displays and self-luminous flat panel displays, wherein liquid crystal displays are a type of non-self-luminous flat panel displays that have been used for a long time, while organic light-emitting diode (OLED) displays and light-emitting diode (LED) displays are self-luminous flat panel displays that are currently in mainstream applications.

FIG1 is a block diagram of a known OLED display device. As shown in FIG1 , the known OLED display device 1a mainly includes: an OLED display panel 11a and at least one display driver chip 12a, wherein the OLED display panel 11a includes M×N pixel circuits 111a, M×N OLED elements 112a, M gate lines 11Ga, and N source lines 11Sa. To explain in more detail, one pixel circuit 111a and one OLED element 112a constitute one OLED pixel unit, so that the OLED display panel 11a includes M×N OLED pixel units. During normal operation, the display driver chip 12a receives display data transmitted from a host computer 2a (such as an application processor of a smart phone), and controls each pixel circuit 111a to operate according to the display data so that each OLED element 112a emits light or does not emit light, thereby driving the OLED display panel 11a to display images.

Traditionally, the pixel circuit 111a adopts a 2T1C structure, that is, it includes two thin-film transistors (TFT) and a capacitor. In recent years, in order to improve the uneven brightness of OLED components caused by the difference in transistor threshold voltage (Vth) and the rise in cross-voltage caused by aging of OLED components, pixel circuits 111a using 4T1C or 5T1C structures have been proposed and applied in the production of OLED display panels 11a. Unfortunately, the existing pixel circuit 111a still has the problem of uneven brightness of OLED components 112a caused by the difference in threshold voltage, which eventually causes the so-called Mura phenomenon in some blocks of the OLED display panel 11a.

From the above description, it can be seen that a new pixel circuit is urgently needed in this field.

The main purpose of the present invention is to provide a pixel circuit, which is used to form an OLED pixel unit with an OLED element, and M×N OLED pixel units form an OLED panel. The pixel circuit of the present invention adopts an 8T1C structure, which can compensate for the difference in threshold voltage between TFT elements, so that each OLED element emits light with uniform brightness, ensuring that the OLED display panel will not have the so-called Mura phenomenon during the image display process. At the same time, the pixel circuit of the present invention can also effectively avoid the phenomenon of uneven screen brightness caused by ELVDD drop.

To achieve the above-mentioned purpose, the present invention proposes an embodiment of the pixel circuit, which includes: A data driving unit, having a first end, a second end, a third end, a fourth end, a fifth end, a sixth end, a seventh end, and an eighth end, wherein the first end is coupled to a first driving voltage, the fourth end is coupled to a driving end, the fifth end is coupled to a first light-emitting control signal, and the eighth end is coupled to a second light-emitting control signal; A first switch unit, having a first end, a second end, a third end, a fourth end, and a fifth end, wherein the first end is coupled to the second light-emitting control signal, the second end is coupled to the seventh end of the data driving unit, the third end is coupled to a data voltage, the fourth end is coupled to a first control signal, and the fifth end is coupled to a second control signal; A second switch unit having a first end, a second end and a third end, wherein the first end is coupled to the second control signal, the second end is coupled to the drive end, the drive end is coupled to an OLED element, and the third end is coupled to a common voltage; A third switch unit having a first end, a second end and a third end, wherein the first end is coupled to a third control signal, the second end is coupled to the sixth end of the data drive unit, and the third end is coupled to the common voltage; A fourth switch unit having a first end, a second end and a third end, wherein the second end is coupled to a third light-emitting control signal, and the third end is coupled to the third end of the data drive unit; and A storage capacitor, one end of which is coupled to the first end of the data driving unit, and the other end of which is simultaneously coupled to the first end of the fourth switch unit and the second end of the data driving unit.

In one embodiment, the data drive unit includes: a first TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the first electrical terminal serve as the eighth terminal and the first terminal of the data drive unit respectively; a second TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal serves as the second terminal of the data drive unit, and the first electrical terminal is coupled to the second electrical terminal of the first TFT element; and a third TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the second electrical terminal serve as the fifth terminal and the fourth terminal of the data drive unit respectively, and the first electrical terminal is coupled to the second electrical terminal of the second TFT element.

In one embodiment, the first switch unit includes: a fourth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the first electrical terminal and the gate terminal serve as the first terminal and the fifth terminal of the first switch unit respectively; and a fifth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the second electrical terminal and the gate terminal serve as the third terminal and the fourth terminal of the first switch unit respectively, and the first electrical terminal is coupled to the second electrical terminal of the fourth TFT element to form a first common terminal, and the first common terminal serves as the second terminal of the first switch unit.

In one embodiment, the second switch unit includes: A sixth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the first terminal, the second terminal and the third terminal of the second switch unit respectively.

In one embodiment, the third switch unit includes: A seventh TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the first terminal, the second terminal and the third terminal of the third switch unit respectively.

In one embodiment, the fourth switch unit includes: An eighth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the second terminal, the third terminal and the first terminal of the fourth switch unit respectively.

In a feasible embodiment, the eighth TFT element is an N-type low temperature polycrystalline oxide (LTPO) TFT element, and the first TFT element, the second TFT element, the third TFT element, the fourth TFT element, the fifth TFT element, the sixth TFT element, and the seventh TFT element are all P-type low temperature polycrystalline silicon (LTPS) TFT elements.

Furthermore, the present invention also provides an embodiment of an OLED display device, which includes an OLED display panel and at least one display driver chip, wherein the OLED display panel includes M×N pixel units, and each pixel unit is composed of a pixel circuit and an OLED element; the pixel circuit includes: A data driver unit having a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, and an eighth terminal, wherein the first terminal is coupled to a first driving voltage, the fourth terminal is coupled to a driving terminal, the fifth terminal is coupled to a first light-emitting control signal, and the eighth terminal is coupled to a second light-emitting control signal; A first switch unit, having a first end, a second end, a third end, a fourth end, and a fifth end, wherein the first end is coupled to the second light-emitting control signal, the second end is coupled to the seventh end of the data driving unit, the third end is coupled to a data voltage, the fourth end is coupled to a first control signal, and the fifth end is coupled to a second control signal; A second switch unit, having a first end, a second end, and a third end, wherein the first end is coupled to the second control signal, the second end is coupled to the driving end, the driving end is coupled to an OLED element, and the third end is coupled to a common voltage; A third switch unit, having a first end, a second end and a third end, wherein the first end is coupled to a third control signal, the second end is coupled to the sixth end of the data drive unit, and the third end is coupled to the common voltage; A fourth switch unit, having a first end, a second end and a third end, wherein the second end is coupled to a third light-emitting control signal, and the third end is coupled to the third end of the data drive unit; and A storage capacitor, one end of which is coupled to the first end of the data drive unit, and the other end of which is simultaneously coupled to the first end of the fourth switch unit and the second end of the data drive unit.

In one embodiment, the data drive unit includes: a first TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the first electrical terminal serve as the eighth terminal and the first terminal of the data drive unit respectively; a second TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal serves as the second terminal of the data drive unit, and the first electrical terminal is coupled to the second electrical terminal of the first TFT element; and a third TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the second electrical terminal serve as the fifth terminal and the fourth terminal of the data drive unit respectively, and the first electrical terminal is coupled to the second electrical terminal of the second TFT element.

In one embodiment, the first switch unit includes: a fourth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the first electrical terminal and the gate terminal serve as the first terminal and the fifth terminal of the first switch unit respectively; and a fifth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the second electrical terminal and the gate terminal serve as the third terminal and the fourth terminal of the first switch unit respectively, and the first electrical terminal is coupled to the second electrical terminal of the fourth TFT element to form a first common terminal, and the first common terminal serves as the second terminal of the first switch unit.

In one embodiment, the second switch unit includes: A sixth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the first terminal, the second terminal and the third terminal of the second switch unit respectively.

In one embodiment, the third switch unit includes: A seventh TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the first terminal, the second terminal and the third terminal of the third switch unit respectively.

In one embodiment, the fourth switch unit includes: An eighth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the second terminal, the third terminal and the first terminal of the fourth switch unit respectively.

In a feasible embodiment, the eighth TFT element is an N-type low temperature polycrystalline oxide (LTPO) TFT element, and the first TFT element, the second TFT element, the third TFT element, the fourth TFT element, the fifth TFT element, the sixth TFT element, and the seventh TFT element are all P-type low temperature polycrystalline silicon (LTPS) TFT elements.

Furthermore, the present invention also provides an information processing device, characterized in that it has at least one OLED display device of the present invention as described above. In one embodiment, the information processing device is an electronic device selected from the group consisting of a head-mounted display device, a smart TV, a smart phone, a smart watch, a tablet computer, an all-in-one computer, a notebook computer, a car entertainment device, a digital camera, and a video door phone.

In order to enable the Review Committee to further understand the structure, features, purpose, and advantages of the present invention, the following are attached with drawings and detailed descriptions of preferred specific embodiments.

FIG2 is a block diagram of an OLED display device including a pixel circuit of the present invention. As shown in FIG2, the OLED display device 1 mainly includes: an OLED display panel 11 and at least one display driver chip 12, wherein the OLED display panel 11 includes M×N pixel circuits 1P, M×N OLED elements 112, M gate lines 11G, and N source lines 11S. During normal operation, the display driver chip 12 receives a display data transmitted from a host computer 2 (such as an application processor of a smart phone), and controls each of the pixel circuits 1P to operate according to the display data so that each of the light-emitting elements 112 emits light or does not emit light, thereby making the OLED display panel 11 display an image.

FIG3 is a circuit topology diagram of the pixel circuit 1P shown in FIG2. As shown in FIG3, the pixel circuit 1P of the present invention includes: a data driving unit 1P0, a first switch unit 1P1, a second switch unit 1P2, a third switch unit 1P3, a fourth switch unit 1P4, and a storage capacitor 1PC, wherein the data driving unit 1P0 has a first terminal 1P01, a second terminal 1P02, a third terminal 1P03, a fourth terminal 1P04, a fifth terminal 1P05, a sixth terminal 1P06, a seventh terminal 1P07, and an eighth terminal 1P08. Furthermore, the first terminal 1P01 is coupled to a first driving voltage ELVDD, the fourth terminal 1P04 is coupled to a driving terminal, the fifth terminal 1P05 is coupled to a first light-emitting control signal EM1, and the eighth terminal 1P08 is coupled to a second light-emitting control signal EM2. Specifically, as shown in FIG. 3 , the present invention comprises a first TFT element M1, a second TFT element M2, and a third TFT element M3 to form the data driving unit 1P0.

Electronic engineers familiar with the design and manufacture of LCD and/or OLED pixel circuits will inevitably know that a TFT element is a symmetrical element, whose gate terminal is the element control terminal, and its two ends are two electrical terminals, which are determined as the source terminal and the drain terminal according to the flow direction of the current. Simply put, when one electrical terminal is used as the source terminal, the other terminal is the drain terminal, and vice versa. Based on this concept, as shown in FIG3 , the first TFT element M1 has a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the first electrical terminal serve as the eighth terminal 1P08 and the first terminal 1P01 of the data drive unit 1P0, respectively. On the other hand, the second TFT element M2 has a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal serves as the second terminal 1P02 of the data driving unit 1P0, and the first electrical terminal is coupled to the second electrical terminal of the first TFT element M1. In addition, the third TFT element M3 has a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the second electrical terminal serve as the fifth terminal 1P05 and the fourth terminal 1P04 of the data driving unit 1P0, respectively, and the first electrical terminal is coupled to the second electrical terminal of the second TFT element M2.

As shown in FIG3 , the first switch unit 1P1 has a first terminal 1P11, a second terminal 1P12, a third terminal 1P13, a fourth terminal 1P14, and a fifth terminal 1P15, wherein the first terminal 1P11 is coupled to the second light-emitting control signal EM2, the second terminal 1P12 is coupled to the seventh terminal 1P07 of the data driving unit 1P0, the third terminal 1P13 is coupled to a data voltage Vdata, the fourth terminal 1P14 is coupled to a first control signal S1, and the fifth terminal 1P15 is coupled to a second control signal S2. Specifically, the present invention uses a fourth TFT element M4 and a fifth TFT element M5 to form the first switch unit 1P1. As shown in FIG3 , the fourth TFT element M4 has a gate terminal, a first electrical terminal and a second electrical terminal, wherein the first electrical terminal and the gate terminal are used as the first terminal 1P11 and the fifth terminal 1P15 of the first switch unit 1P1, respectively. On the other hand, the fifth TFT element M5 has a gate terminal, a first electrical terminal and a second electrical terminal, wherein the second electrical terminal and the gate terminal are used as the third terminal 1P13 and the fourth terminal 1P14 of the first switch unit 1P1, respectively, and the first electrical terminal is coupled to the second electrical terminal of the fourth TFT element M4 to form a first common terminal, and the first common terminal is used as the second terminal 1P12 of the first switch unit 1P1.

Further, the second switch unit 1P2 has a first terminal 1P21, a second terminal 1P22 and a third terminal 1P23, wherein the first terminal 1P21 is coupled to the second control signal S2, the second terminal 1P22 is coupled to the driving terminal, the driving terminal is coupled to an OLED element, and the third terminal 1P23 is coupled to a common voltage Vcom. Specifically, as shown in FIG. 3 , the present invention uses a sixth TFT element M6 as the second switch unit 1P2, and the sixth TFT element M6 has a gate terminal, a first electrical terminal and a second electrical terminal as the first terminal 1P21, the second terminal 1P22 and the third terminal 1P23 of the second switch unit 1P2, respectively.

On the other hand, the third switch unit 1P3 has a first terminal 1P31, a second terminal 1P32 and a third terminal 1P33, wherein the first terminal 1P31 is coupled to a third control signal S3, the second terminal 1P32 is coupled to the sixth terminal 1P06 of the data driving unit 1P0, and the third terminal 1P33 is coupled to the common voltage Vcom. According to the design of the present invention, as shown in FIG3, the third switch unit includes a seventh TFT element M7, which has a gate terminal, a first electrical terminal and a second electrical terminal as the first terminal 1P31, the second terminal 1P32 and the third terminal 1P33 of the third switch unit 1P3 respectively.

Furthermore, the fourth switch unit 1P4 has a first terminal 1P41, a second terminal 1P42 and a third terminal 1P43, wherein the second terminal 1P42 is coupled to a third light-emitting control signal EM3, and the third terminal 1P43 is coupled to the third terminal 1P03 of the data driving unit 1P0. Specifically, the present invention uses an eighth TFT element M8 as the fourth switch unit, and the eighth TFT element M8 has a gate terminal, a first electrical terminal and a second electrical terminal as the second terminal 1P42, the third terminal 1P43 and the first terminal 1P41 of the fourth switch unit 1P4 respectively. On the other hand, one end of the storage capacitor 1PC is coupled to the first end 1P01 of the data driving unit 1P0, and the other end thereof is simultaneously coupled to the first end 1P41 of the fourth switch unit 1P4 and the second end 1P02 of the data driving unit 1P0.

In particular, in the pixel circuit 1P of the present invention, the eighth TFT element M8 is an N-type low temperature polycrystalline oxide (LTPO) TFT element, and the first TFT element M1, the second TFT element M2, the third TFT element M3, the fourth TFT element M4, the fifth TFT element M5, the sixth TFT element M6, and the seventh TFT element M7 are all P-type low temperature polycrystalline silicon (LTPS) TFT elements.

FIG4 is a working timing diagram of multiple signals for controlling the pixel circuit of the present invention. As shown in FIG3 and FIG4, in the time interval T1, since the second control signal S2 and the first light emission control signal EM1 are both at a low level and the third light emission control signal EM3 is at a high level, the third TFT element M3, the fourth TFT element M4, the sixth TFT element M6, and the eighth TFT element M8 are all turned on, so that the common voltage Vcom resets the terminal voltage of the anode terminal of the OLED element 112 through the sixth TFT element M6. In addition, the common voltage Vcom also resets the terminal voltage of the gate terminal of the second TFT element M2 through the third TFT element M3, the sixth TFT element M6, and the eighth TFT element M8, thereby resetting the capacitor voltage of the storage capacitor 1PC. To explain in more detail, in the time interval T1, the high voltage (VGH) of the first light emission control signal EM1 is transmitted to the first node N1 through the fourth TFT element M4, so that the VGS of the second TFT element M2 is Vcom-VGH. In this way, it can be ensured that before writing the current frame data voltage Vdata, the second TFT elements M2 of all pixel circuits 1P are at the same VGS bias, thereby improving the short-term afterimage phenomenon of the OLED display panel 11 caused by the hysteresis effect.

In the time interval T2, since the first control signal S1 and the third control signal S3 are both at a low level and the third light-emitting control signal EM3 is at a high level, the eighth TFT element M8, the fifth TFT element M5 and the seventh TFT element M7 are all turned on, so that the data voltage Vdata of the current frame can be transmitted to the second node N2, thereby charging the storage capacitor 1PC. To explain in more detail, in the time interval T2, if the node voltage V N2 of the second node _N2 =Vdata+Vth(M2), the second TFT element M2 will be turned off, so that the storage capacitor 1PC is no longer charged by Vdata. It should be understood that since the node voltage of the second node N2 is charged to Vdata+Vth(M2), it plays a role in compensating the critical voltage of the second TFT element M2 (i.e., Vth(M2)). In short, T2 is the compensation stage of the critical voltage of the second TFT element M2 and the writing stage of the data voltage.

Furthermore, in the time interval T3, since the second light emission control signal EM2 and the first light emission control signal EM1 are both at a low level, the first TFT element M1, the second TFT element M2 and the third TFT element M3 are all turned on, so that the OLED element 112 is driven by the voltage to emit light. Furthermore, the following mathematical operation can be performed according to the transistor saturation region current formula:

From the above mathematical calculation results, it can be seen that Vth is offset and the driving current of the OLED element 112 has nothing to do with Vth. Therefore, the pixel circuit 1P of the present invention can improve the uneven display phenomenon caused by the inconsistent Vth voltage of the TFT element.

Thus, the above has completely and clearly explained the pixel circuit of the present invention; and, from the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses a pixel circuit, which is used to form an OLED pixel unit with an OLED element, and M×N OLED pixel units form an OLED panel. The pixel circuit of the present invention adopts an 8T1C structure, which can compensate for the difference in threshold voltage between TFT elements, so that each OLED element emits light with uniform brightness, ensuring that the OLED display panel will not have the so-called Mura phenomenon during the image display process. At the same time, the pixel circuit of the present invention can also effectively avoid the phenomenon of uneven screen brightness caused by ELVDD drop.

(2) The present invention also provides an OLED display device, which includes an OLED display panel and at least one display driver chip, wherein the OLED display panel includes M×N OLED pixel units, and is characterized in that each of the OLED pixel units is composed of an OLED element and a pixel circuit of the present invention.

(3) The present invention also provides an information processing device having the OLED display device of the present invention as described above. Furthermore, the information processing device is an electronic device selected from the group consisting of a head-mounted display device, a smart TV, a smart phone, a smart watch, a tablet computer, an all-in-one computer, a notebook computer, an in-vehicle entertainment device, a digital camera, and a video door phone.

It must be emphasized that what is disclosed in the above-mentioned case is a preferred embodiment. Any partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by people familiar with the art do not deviate from the scope of the patent rights of this case.

In summary, this case shows that its purpose, means and effects are all different from the known technology, and it is the first invention that is practical and indeed meets the patent requirements for invention. We sincerely request the review committee to examine this carefully and grant a patent as soon as possible to benefit the society. This is our utmost prayer.

1a: OLED display device

11a:OLED display panel

111a: Pixel circuit

112a: OLED element

11Ga: Gate line

11Sa: Source line

12a: Display driver chip

2a: Host computer

1:OLED display device

11:OLED display panel

112: OLED components

11G: Gate line

11S: Source line

12: Display driver chip

2: Host computer

1P: Pixel circuit

1P0: Data drive unit

1P01: First end

1P02: Second end

1P03: Third terminal

1P04: The fourth end

1P05: The fifth end

1P06: The Sixth Terminal

1P07: The Seventh End

1P08: The Eighth Terminal

1P1: First switch unit

1P11: First End

1P12: Second end

1P13: Third terminal

1P14: The fourth end

1P15: Fifth terminal

1P2: Second switch unit

1P21: First End

1P22: Second end

1P23: Third terminal

1P3: The third switch unit

1P31: First end

1P32: Second end

1P33: The third end

1P4: The fourth switch unit

1P41: First End

1P42: Second end

1P43: The third end

1PC: Storage capacitor

FIG. 1 is a block diagram of a known OLED display device; FIG. 2 is a block diagram of an OLED display device including a pixel circuit of the present invention; FIG. 3 is a circuit topology diagram of the pixel circuit shown in FIG. 2; and FIG. 4 is a working timing diagram of multiple signals used to control the pixel circuit of the present invention.

1P: Pixel circuit

1P0: Data drive unit

1P01: First end

1P02: Second end

1P03: The third end

1P04: The fourth end

1P05: The fifth end

1P06: The sixth end

1P07: The seventh end

1P08: The eighth end

1P1: First switch unit

1P11: First end

1P12: Second end

1P13: The third end

1P14: The fourth end

1P15: Fifth terminal

1P2: Second switch unit

1P21: First end

1P22: Second end

1P23: Third terminal

1P3: The third switch unit

1P31: First end

1P32: Second end

1P33: The third end

1P4: The fourth switch unit

1P41: First end

1P42: Second end

1P43: The third end

1PC: Storage capacitor

Claims (13)

A pixel circuit includes: A data driving unit having a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, and an eighth terminal, wherein the first terminal is coupled to a first driving voltage, the fourth terminal is coupled to a driving terminal, the fifth terminal is coupled to a first light-emitting control signal, and the eighth terminal is coupled to a second light-emitting control signal; A first switch unit having a first terminal, a second terminal, a third terminal, a fourth terminal, and a fifth terminal, wherein the first terminal is coupled to the second light-emitting control signal, the second terminal is coupled to the seventh terminal of the data driving unit, the third terminal is coupled to a data voltage, the fourth terminal is coupled to a first control signal, and the fifth terminal is coupled to a second control signal; A second switch unit having a first end, a second end and a third end, wherein the first end is coupled to the second control signal, the second end is coupled to the drive end, the drive end is coupled to an OLED element, and the third end is coupled to a common voltage; A third switch unit having a first end, a second end and a third end, wherein the first end is coupled to a third control signal, the second end is coupled to the sixth end of the data drive unit, and the third end is coupled to the common voltage; A fourth switch unit having a first end, a second end and a third end, wherein the second end is coupled to a third light-emitting control signal, and the third end is coupled to the third end of the data drive unit; and A storage capacitor, one end of which is coupled to the first end of the data driving unit, and the other end of which is simultaneously coupled to the first end of the fourth switch unit and the second end of the data driving unit. A pixel circuit as described in claim 1, wherein the data drive unit comprises: a first TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the first electrical terminal serve as the eighth terminal and the first terminal of the data drive unit respectively; a second TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal serves as the second terminal of the data drive unit, and the first electrical terminal is coupled to the second electrical terminal of the first TFT element; and A third TFT element has a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the second electrical terminal serve as the fifth terminal and the fourth terminal of the data driving unit respectively, and the first electrical terminal is coupled to the second electrical terminal of the second TFT element. A pixel circuit as described in claim 2, wherein the first switch unit includes: a fourth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the first electrical terminal and the gate terminal serve as the first terminal and the fifth terminal of the first switch unit respectively; and a fifth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the second electrical terminal and the gate terminal serve as the third terminal and the fourth terminal of the first switch unit respectively, and the first electrical terminal is coupled to the second electrical terminal of the fourth TFT element to form a first common terminal, and the first common terminal serves as the second terminal of the first switch unit. The pixel circuit as described in claim 3, wherein the second switch unit includes: A sixth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the first terminal, the second terminal and the third terminal of the second switch unit respectively. The pixel circuit as described in claim 4, wherein the third switch unit includes: A seventh TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the first terminal, the second terminal and the third terminal of the third switch unit respectively. The pixel circuit as described in claim 5, wherein the fourth switch unit includes: An eighth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the second terminal, the third terminal and the first terminal of the fourth switch unit respectively. An OLED display device includes an OLED display panel and at least one display driver chip, wherein the OLED display panel includes M×N pixel units, and each pixel unit is composed of a pixel circuit and an OLED element; the pixel circuit includes: A data driver unit having a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, and an eighth terminal, wherein the first terminal is coupled to a first driving voltage, the fourth terminal is coupled to a driving terminal, the fifth terminal is coupled to a first light-emitting control signal, and the eighth terminal is coupled to a second light-emitting control signal; A first switch unit having a first end, a second end, a third end, a fourth end, and a fifth end, wherein the first end is coupled to the second light-emitting control signal, the second end is coupled to the seventh end of the data driving unit, the third end is coupled to a data voltage, the fourth end is coupled to a first control signal, and the fifth end is coupled to a second control signal; A second switch unit having a first end, a second end, and a third end, wherein the first end is coupled to the second control signal, the second end is coupled to the driving end, the driving end is coupled to an OLED element, and the third end is coupled to a common voltage; A third switch unit, having a first end, a second end and a third end, wherein the first end is coupled to a third control signal, the second end is coupled to the sixth end of the data drive unit, and the third end is coupled to the common voltage; A fourth switch unit, having a first end, a second end and a third end, wherein the second end is coupled to a third light-emitting control signal, and the third end is coupled to the third end of the data drive unit; and A storage capacitor, one end of which is coupled to the first end of the data drive unit, and the other end of which is simultaneously coupled to the first end of the fourth switch unit and the second end of the data drive unit. An OLED display device as described in claim 7, wherein the data drive unit comprises: a first TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the first electrical terminal serve as the eighth terminal and the first terminal of the data drive unit respectively; a second TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal serves as the second terminal of the data drive unit, and the first electrical terminal is coupled to the second electrical terminal of the first TFT element; and A third TFT element has a gate terminal, a first electrical terminal and a second electrical terminal, wherein the gate terminal and the second electrical terminal serve as the fifth terminal and the fourth terminal of the data driving unit respectively, and the first electrical terminal is coupled to the second electrical terminal of the second TFT element. An OLED display device as described in claim 8, wherein the first switch unit includes: a fourth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the first electrical terminal and the gate terminal serve as the first terminal and the fifth terminal of the first switch unit respectively; and a fifth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal, wherein the second electrical terminal and the gate terminal serve as the third terminal and the fourth terminal of the first switch unit respectively, and the first electrical terminal is coupled to the second electrical terminal of the fourth TFT element to form a first common terminal, and the first common terminal serves as the second terminal of the first switch unit. The OLED display device as described in claim 9, wherein the second switch unit includes: A sixth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the first terminal, the second terminal and the third terminal of the second switch unit respectively. The OLED display device as described in claim 10, wherein the third switch unit includes: A seventh TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the first terminal, the second terminal and the third terminal of the third switch unit respectively. The OLED display device as described in claim 11, wherein the fourth switch unit includes: An eighth TFT element having a gate terminal, a first electrical terminal and a second electrical terminal serving as the second terminal, the third terminal and the first terminal of the fourth switch unit respectively. An information processing device, characterized in that it has at least one OLED display device as described in any one of claim 7 to claim 12.

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