TWI767354B - OLED pixel compensation circuit, OLED display and information processing device - Google Patents

Abstract

The present invention mainly discloses an OLED pixel compensation circuit, which is applied in an OLED display panel and includes N×M switch units. A selected switch unit forms a first channel during a capacitor charging time interval, so that a voltage maintaining capacitor of a selected pixel circuit is coupled to the ground terminal through the first channel. In addition, the switch unit forms a second channel in a voltage maintaining time interval, so that the voltage maintaining capacitor is coupled to an adjustment voltage through the second channel, so that the terminal voltage of the voltage maintaining capacitor is adjusted to a predetermined driving voltage, so that a driving current generating unit of the pixel circuit generates a driving current according to the driving voltage. In other words, by changing the adjustment voltage, the driving voltage can be adjusted dynamically and in a wide range, so that there is no difference in driving current between two different driving current generating units, so that the plurality of OLED sub-units of the OLED display panel Pixels emit light evenly.

Description

OLED pixel compensation circuit, OLED display and information processing device

The present invention relates to the technical field of OLED displays, in particular to an OLED pixel compensation circuit that utilizes the technology of dynamically adjusting the driving voltage to enable a plurality of OLED sub-pixels of an OLED display panel to emit light uniformly.

It is known that Organic Light-Emitting Diode (OLED) has the advantages of self-luminescence, high brightness, high contrast, wide viewing angle, power consumption, high reaction rate, etc., so it has been widely used in self-luminescence. The manufacture of display panels includes active OLED (ie, AMOLED) display panels and active OLED (ie, PMOLED) display panels.

FIG. 1 shows a block diagram of a conventional OLED display. As shown in FIG. 1, the OLED display 1a mainly includes: an OLED display panel 11a, a gate (column) driving circuit 12a, a source (row) driving circuit 13a, and a display controller 14a. The OLED display panel 11a includes N×M OLED sub-pixels 111a, N×M pixel circuits 112a, M source driving lines 11Sa, and N gate driving lines 11Ga. Moreover, each gate driving line 11Ga is coupled to M pixel circuits 112a along the column direction, and each source driving line 11Sa is coupled to N pixel circuits 112a along the row direction.

FIG. 2 shows a block diagram of N pixel circuits in the i-th row of the OLED display panel of FIG. 1 . In the design of the conventional OLED display panel 11a, each of the OLED sub-pixels 111a is coupled to one of the pixel circuits 112a, wherein the pixel circuit 112a includes a driving current generating unit 1121a and a voltage maintaining unit 1122a. As shown in FIG. 2, the voltage maintaining unit 1122a is generally a capacitor.

3a, 3b and 3c show schematic diagrams of circuit operation of a conventional pixel circuit. As shown in FIG. 3a, according to the previous display data signal V _DATA , a capacitor voltage of the voltage maintaining unit 1122a (ie, the capacitor) is maintained at the initial driving voltage V ₀ . Further, as shown in FIG. 3b, when the current voltage level of the display data signal V _DATA is adjusted to the _first driving voltage V1, the capacitor voltage of the voltage maintaining unit 1122a is charged to the _first driving voltage V1 . Finally, as shown in FIG. 3c , according to the current display data signal V _DATA , the capacitor voltage of the voltage maintaining unit 1122 a is maintained at the first driving voltage V ₁ . It should be understood that the driving current generating unit 1121a generates a driving current for driving the OLED sub-pixel 111a to emit light according to the terminal voltage of the capacitor of the voltage maintaining unit 1122a (ie, the aforementioned driving voltage). At the same time, the magnitude of the driving current can be changed by changing the level value of the driving voltage, so as to achieve the effect of adjusting the luminous intensity of the OLED sub-pixel 111a.

It is added that the conventional driving current generating unit 1121a is composed of a plurality of thin film transistor (TFT) elements, and the process error often causes the threshold voltage values of the plurality of thin film transistor elements to be inconsistent, that is, different There is a difference in threshold voltage between the two thin-film transistor elements of . In this case, when two different driving current generating units 1121a are driven with the same driving voltage, the aforementioned difference in threshold voltage will cause the two driving currents generated by the two driving current generating units 1121a to have current value differences at the same time. Finally, under the same driving voltage, there is a difference in driving current between two different driving current generating units 1121a, so that the plurality of OLED sub-pixels 111a of the OLED display panel 11a cannot emit light uniformly.

As can be seen from the above description, there is an urgent need in the art for a new type of OLED pixel compensation circuit integrated in an OLED panel.

The main purpose of the present invention is to provide an OLED pixel compensation circuit, which is applied in an OLED display panel and includes N×M switch units. A selected switch unit forms a first channel during a capacitor charging time interval, so that a voltage maintaining capacitor of a selected pixel circuit is coupled to the ground terminal through the first channel. In addition, the switch unit forms a second channel in a voltage maintaining time interval, so that the voltage maintaining capacitor is coupled to an adjustment voltage through the second channel, so that the terminal voltage of the voltage maintaining capacitor is adjusted to a predetermined driving voltage, so that a driving current generating unit of the pixel circuit generates a driving current according to the driving voltage. In other words, by changing the adjustment voltage, the driving voltage can be adjusted dynamically and in a wide range, so that there is no difference in driving current between two different driving current generating units, so that the plurality of OLED sub-units of the OLED display panel Pixels emit light evenly.

In order to achieve the above object, the present invention proposes a first embodiment of the OLED pixel compensation circuit, which is applied to an OLED display including at least one display driver chip and an OLED display panel; wherein the OLED display panel includes N×M OLED sub-pixels and N×M pixel circuits, and each pixel circuit includes a driving current generating unit and a voltage maintaining capacitor coupled to the driving current generating unit with a first end thereof; The OLED pixel compensation circuit includes:

N×M first switch units, wherein each of the first switch units has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal, the first electrical terminal The electrical terminal and the second electrical terminal are simultaneously coupled to a common contact, the third electrical terminal is coupled to a ground terminal, the fourth electrical terminal is coupled to an adjustment voltage, and the common contact is coupled to the a second end of the voltage maintaining capacitor;

Wherein, in a capacitor charging time interval, a first channel is formed inside the first switch unit, so that the second end of the voltage maintaining capacitor is coupled to the ground terminal through the first channel, so that the voltage maintaining capacitor is After being charged, the first terminal has a terminal voltage;

Wherein, in a voltage maintenance time interval, a second channel is formed inside the first switch unit, so that the second end of the voltage maintenance capacitor is coupled to the adjustment voltage through the second channel, so as to utilize the adjustment voltage The terminal voltage of the voltage maintaining capacitor is adjusted to a driving voltage.

In one embodiment, each of the first switch units includes:

a first switch, having a first terminal coupled to the first electrical terminal, a second terminal coupled to the fourth electrical terminal, and a control terminal coupled to a first control signal; and

a second switch, having a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a second control signal;

The second switch forms the first channel according to the control of the second control signal during the capacitor charging time interval, and the first switch is controlled by the first control signal during the voltage maintaining time interval. control to form the second channel.

In a possible embodiment, the OLED pixel compensation circuit of the present invention further includes: N×M second switch units, wherein each of the second switch units has a first electrical terminal and a second electrical terminal terminal, a third electrical terminal and a fourth electrical terminal, the first electrical terminal and the second electrical terminal are simultaneously coupled to the common contact point, the third electrical terminal is coupled to a current sink unit, and the fourth electrical terminal is coupled to a current source unit; wherein each of the second switch units includes:

a third switch, having a first terminal coupled to the first electrical terminal, a second terminal coupled to the fourth electrical terminal, and a control terminal coupled to a third control signal; and

A fourth switch has a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a fourth control signal.

Furthermore, in order to achieve the above object, the present invention proposes a second embodiment of the OLED pixel compensation circuit, which is applied to an OLED display including at least one display driver chip and an OLED display panel; wherein, the OLED display The panel includes N×M OLED sub-pixels and N×M pixel circuits, and each of the pixel circuits includes a driving current generating unit and a voltage maintaining unit coupled to the driving current generating unit with a first end thereof Capacitance; the OLED pixel compensation circuit includes:

a signal transmission line coupled to a second end of the N×M voltage maintaining capacitors; and

N switch units, wherein each switch unit has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal, the first electrical terminal and the second electrical terminal The electrical terminal is simultaneously coupled to a common contact, the third electrical terminal is coupled to a ground terminal, the fourth electrical terminal is coupled to an adjustment voltage, and the common contact is coupled to the signal transmission line;

Wherein, in a capacitor charging time interval, a first channel is formed inside the switch unit, so that the second end of the voltage maintaining capacitor is coupled to the ground terminal through the signal transmission line and the first channel, so that the After the voltage maintaining capacitor is charged, the first terminal has a terminal voltage;

Wherein, in a voltage maintenance time interval, a second channel is formed inside the switch unit, so that the second end of the voltage maintenance capacitor is coupled to the adjustment voltage through the signal transmission line and the second channel, so as to utilize The adjusting voltage adjusts the terminal voltage of the voltage maintaining capacitor to a driving voltage.

In one embodiment, each of the first switch units includes:

a first switch, having a first terminal coupled to the first electrical terminal, a second terminal coupled to the fourth electrical terminal, and a control terminal coupled to a first control signal; and

a second switch, having a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a second control signal;

The second switch forms the first channel according to the control of the second control signal during the capacitor charging time interval, and the first switch is controlled by the first control signal during the voltage maintaining time interval. control to form the second channel.

In a possible embodiment, the OLED pixel compensation circuit of the present invention further includes: N second switch units, wherein each of the second switch units has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal, the first electrical terminal and the second electrical terminal are simultaneously coupled to the common contact, the third electrical terminal is coupled to a current sink unit, and the fourth electrical terminal is coupled to a current source unit; wherein, each of the second switch units includes:

a third switch, having a first terminal coupled to the first electrical terminal, a second terminal coupled to the fourth electrical terminal, and a control terminal coupled to a third control signal; and

A fourth switch has a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a fourth control signal.

The present invention also provides an OLED display, which includes at least one display driver chip and an OLED display panel, wherein the OLED display panel includes the first embodiment of the OLED pixel compensation circuit of the present invention as described above.

Furthermore, the present invention provides another information processing device, which has an OLED display including at least one display driver chip and an OLED display panel, wherein the OLED display panel includes the OLED pixels of the present invention as described above. Second embodiment of compensation circuit.

The present invention also provides an information processing device, which has an OLED display including at least one display driver chip and an OLED display panel, wherein the OLED display panel includes the OLED pixel compensation circuit of the present invention as described above. first embodiment.

In addition, the present invention further provides an information processing device having an OLED display including at least one display driver chip and an OLED display panel, wherein the OLED display panel includes the OLED pixel compensation of the present invention as described above. The second embodiment of the circuit.

In one embodiment, the aforementioned information processing device is an electronic device selected from the group consisting of smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, and access control devices .

In order to enable your examiners to further understand the structure, characteristics, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred embodiments are attached as follows.

first embodiment

The present invention mainly discloses an OLED pixel compensation circuit, which is applied in an OLED display panel to generate an adjustment voltage, so as to use the adjustment voltage to adjust a driving voltage transmitted to a plurality of pixel circuits, so that the A driving current generating unit of the selected at least one pixel circuit generates a driving current according to the driving voltage. In other words, by changing the adjustment voltage, the driving voltage can be adjusted dynamically and in a wide range, so that there is no difference in driving current between two different driving current generating units, so that a plurality of OLED sub-pictures of the OLED display panel Elements glow evenly.

FIG. 4 shows a block diagram of an OLED display integrated with an OLED pixel compensation circuit of the present invention. As shown in FIG. 4 , the OLED display 1 mainly includes: an OLED display panel 11 , a gate (column) driving circuit 12 , a source (row) driving circuit 13 , and a display controller 14 . The OLED display panel 11 includes N×M OLED sub-pixels 111 , N×M pixel circuits 112 , M source driving lines 11S, and N gate driving lines 11G. Moreover, each gate driving line 11G is coupled to M pixel circuits 112 along the column direction, and each source driving line 11S is coupled to N pixel circuits 112 along the row direction.

FIG. 5 shows a block diagram of N pixel circuits in the i-th row of the OLED display panel of FIG. 4 . As shown in FIG. 5 , each of the OLED sub-pixels 111 is coupled to one of the pixel circuits 112 , wherein the pixel circuit 112 includes: a driving current generating unit 1121 , a voltage maintaining capacitor 1122 , and a mode switching switch 1123. It should be noted that the OLED pixel compensation circuit of the present invention includes N×M first switch units 21 , which are respectively coupled to the N×M pixel circuits 112 . According to the design of the present invention, each of the first switch units 21 has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal. In more detail, as shown in FIG. 4 and FIG. 5 , the first electrical terminal and the second electrical terminal are simultaneously coupled to a common contact 22 , the third electrical terminal is coupled to a ground terminal GND, and the The fourth electrical terminal is coupled to an adjustment voltage V _X , and the common contact 22 is coupled to a second terminal of the voltage maintaining capacitor 1122 . In more detail, each of the first switch units 21 includes a first switch 211 and a second switch 212 , wherein the first switch 211 has a first terminal coupled to the first electrical terminal, and a first terminal coupled to the first electrical terminal. A second terminal of the four electrical terminals, and a control terminal coupled to a first control signal S1. On the other hand, the second switch 212 has a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a second control signal S2.

Continuing to refer to FIG. 5, please refer to FIG. 6a and FIG. 6b at the same time, which show a schematic diagram of circuit operation of a pixel circuit connected with the OLED pixel compensation circuit of the present invention. As shown in FIG. 6a, in a capacitor charging time interval, the mode switch 1123 of the pixel circuit 112 forms a channel according to the control of a control signal S0; at this time, the second switch 212 is in the first switch unit 21 A first channel is formed inside, so that the second end of the voltage maintaining capacitor 1122 is coupled to the ground terminal GND through the first channel, so that after the voltage maintaining capacitor 1122 is charged, the first end of the voltage maintaining capacitor 1122 has one end Voltage. As shown in FIG. 6b, in a voltage maintaining time interval, the mode switch 1123 of the pixel circuit 112 is turned on (ie, open circuit) according to the control of the control signal S0; at this time, the first switch 211 is in the first A second channel is formed inside the switch unit 21 , so that the second end of the voltage maintaining capacitor 1122 is coupled to the adjustment voltage V _X through the second channel, so that the adjustment voltage V _X is used to maintain the voltage of the voltage maintaining capacitor 1122 . The terminal voltage is adjusted to a driving voltage.

It is supplemented that, as shown in FIG. 6a, in the capacitor charging time interval, the source driving line 11S transmits a display data signal V _DATA to the voltage maintaining capacitor 1122 through the channel inside the mode switch 1123, thereby The voltage maintaining capacitor 1122 is charged, and finally the terminal voltage of the voltage maintaining capacitor 1122 is equal to a first voltage V1. In this case, the first voltage V1 is transmitted to the driving current generating unit 1121 as a driving voltage V _G. Further, as shown in FIG. 6 b , in the voltage maintaining time interval, the adjustment voltage V _X provided by an adjustment voltage generating unit (not shown) is transmitted through the second pass in the first switch 211 to the second terminal of the voltage maintaining capacitor 1122 . In this case, the driving voltage V _G will be adjusted from the original V1 to V1+V _X .

It should be understood that the driving voltage V _G can be dynamically adjusted by changing the adjusting voltage V _X , so that there is no driving current difference between the two different driving current generating units 1121 , so that the plurality of OLED display panel 11 The OLED sub-pixels 111 emit light uniformly. That is, in the case of applying the OLED pixel compensation circuit of the present invention, the driving voltage V _G is not only determined by the level of the display data signal V _DATA , the driving voltage V _G can change the adjustment voltage V _X method is widely transformed. For example, V1 is 5V and _VX is 4V, then _VG is 9V. Alternatively, V1 can be 1V and VX can be _-4V , then _VG can be -3V.

Second Embodiment

7 is a block diagram of an OLED display integrated with an OLED pixel compensation circuit of the present invention. As shown in FIG. 7 , in the second embodiment, the present invention includes N first switch units 21 and a signal transmission line 20 . The signal transmission line 20 is coupled to a second end of the N×M voltage maintaining capacitors 1122 . Moreover, each of the switch units 21 has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal. As shown in FIG. 7 , the first electrical terminal and the second electrical terminal are simultaneously coupled to a common contact 22 , the third electrical terminal is coupled to a ground terminal GND, and the fourth electrical terminal is coupled to a The voltage V _X is adjusted, and the common contact 22 is coupled to the signal transmission line 20 .

8a and 8b show block diagrams of M pixel circuits in the jth column of the OLED display panel of FIG. 7 . In the second embodiment, each of the first switch units 21 includes a first switch 211 and a second switch 212 , wherein the first switch 211 has a first terminal coupled to the first electrical terminal, coupled to A second terminal of the fourth electrical terminal and a control terminal coupled to a first control signal S1. On the other hand, the second switch 212 has a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a second control signal S2.

As shown in FIG. 8 a , within a capacitor charging time interval, a first channel is formed inside the switch unit 21 , so that the second ends of the M voltage maintaining capacitors 1122 in the jth column of the OLED display panel 11 pass through the The signal transmission line 20 and the first channel are coupled to the ground terminal GND, so that after the voltage maintaining capacitor 1122 is charged, the first terminal has a terminal voltage. In addition, within a voltage maintenance time interval, a second channel is formed inside the switch unit 21, so that the second ends of the M voltage maintenance capacitors 1122 in the jth row of the OLED display panel 11 pass through the signal transmission line 20 and the second channel are coupled to the adjustment voltage V _X , so that the terminal voltage of the voltage maintaining capacitor 1122 is adjusted to a driving voltage by the adjustment voltage V _X .

Third Embodiment

Continue to refer to FIG. 4 , and also refer to FIG. 9 , which shows a block diagram of a pixel circuit connected with an OLED pixel compensation circuit of the present invention. Specifically, the third embodiment is realized by adding N×M second switch units 31 to the first embodiment of the OLED pixel compensation circuit of the present invention. FIG. 9 only exemplarily shows one pixel circuit 112 , one first switch unit 21 and one second switch unit 31 . As shown in FIG. 9 , each of the second switch units 31 has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal. The first electrical terminal is connected to the The second electrical terminal is simultaneously coupled to the common contact 22 , the third electrical terminal is coupled to a current sink unit 32 , and the fourth electrical terminal is coupled to a current source unit 33 .

In more detail, the second switch unit 31 includes a third switch 311 and a fourth switch 312 , wherein the third switch 311 has a first terminal coupled to the first electrical terminal, and the fourth switch 311 has a first terminal coupled to the fourth electrical terminal. A second end of the electrical end, and a control end coupled to a third control signal S3. On the other hand, the fourth switch 312 has a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a fourth control signal S4.

It should be known that the driving current generating unit 1121 is composed of a plurality of thin film transistor (TFT) elements, and the process error often causes the threshold voltage values of the plurality of thin film transistor elements to be inconsistent, that is, two different There is a difference in threshold voltage between thin film transistor elements. Therefore, in the case of receiving the same driving voltage V _G , the driving currents finally generated by the two different driving current generating units 1121 may not necessarily be the same. In addition, the variation or drift of the threshold voltage caused by the process error will also cause the different two driving current generating units 1121 to have different I _OFF currents, and also cause the different two voltage maintaining capacitors 1122 to have different capacitance leakage levels.

Based on the aforementioned reasons, in the third embodiment, the third electrical terminal and the fourth electrical terminal of each of the second switch units 31 are respectively coupled to a current sink unit 32 and a current source unit 33, so as to utilize the current The slot unit 32 and/or the current source unit 33 achieves compensation for the I _OFF current and/or capacitor leakage, thereby eliminating the adverse effects of the I _OFF current and/or capacitor leakage on the driving voltage V _G , thereby maintaining the driving voltage V stability of _G.

Fourth Embodiment

Continue to refer to FIG. 7 , and also refer to FIG. 10 , which shows a block diagram of M pixel circuits in column j of an OLED display panel connected with an OLED pixel compensation circuit of the present invention. It is particularly noted that the fourth embodiment is realized by adding N second switching units 31 to the second embodiment of the OLED pixel compensation circuit of the present invention, and FIG. 10 only exemplarily shows the OLED The M pixel circuits 112 in the j-th column of the display panel 11 , a signal transmission line 20 , a first switch unit 21 , and a second switch unit 31 . As shown in FIG. 10 , each of the second switch units 31 has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal, and the first electrical terminal is connected to The second electrical terminal is simultaneously coupled to the common contact 22 , the third electrical terminal is coupled to a current sink unit 32 , and the fourth electrical terminal is coupled to a current source unit 33 .

In more detail, the second switch unit 31 includes a third switch 311 and a fourth switch 312 , wherein the third switch 311 has a first terminal coupled to the first electrical terminal, and the fourth switch 311 has a first terminal coupled to the fourth electrical terminal. A second end of the electrical end, and a control end coupled to a third control signal S3. On the other hand, the fourth switch 312 has a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a fourth control signal S4.

Thus, the above has completely and clearly described an OLED pixel compensation circuit of the present invention; and, through the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses an OLED pixel compensation circuit, which is applied in an OLED display panel and includes N×M switch units. A selected switch unit forms a first channel during a capacitor charging time interval, so that a voltage maintaining capacitor of a selected pixel circuit is coupled to the ground terminal through the first channel. In addition, the switch unit forms a second channel in a voltage maintaining time interval, so that the voltage maintaining capacitor is coupled to an adjustment voltage through the second channel, so that the terminal voltage of the voltage maintaining capacitor is adjusted to a predetermined driving voltage, so that a driving current generating unit of the pixel circuit generates a driving current according to the driving voltage. In other words, by changing the adjustment voltage, the driving voltage can be adjusted dynamically and in a wide range, so that there is no difference in driving current between two different driving current generating units, so that the plurality of OLED sub-units of the OLED display panel Pixels emit light evenly.

(2) The present invention also provides an OLED display, which includes at least one display driver chip and an OLED display panel, and the OLED display panel includes the OLED pixel compensation circuit of the present invention as described above.

(3) The present invention also provides an information processing device, which has a central processing unit and an OLED display including at least one display driver chip and an OLED display panel, wherein the OLED display panel includes the OLED picture of the present invention as described above. A pixel compensation circuit is provided, and the central processing unit is used for communicating with the at least one display driving chip. Moreover, the aforementioned information processing device is an electronic device selected from the group consisting of smart phones, smart watches, smart bracelets, wearable devices, tablet computers, notebook computers, all-in-one computers, and access control devices .

It must be emphasized that the above-mentioned disclosure in this case is a preferred embodiment, and any partial changes or modifications originating from the technical ideas of this case and easily inferred by those who are familiar with the art are within the scope of the patent of this case. category of rights.

To sum up, regardless of the purpose, means and effect of this case, it shows that it is completely different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. Society is to pray for the best.

1a: OLED display 11a: OLED display panel 111a: OLED sub-pixel 112a: Pixel Circuits 1121a: drive current generation unit 1122a: Voltage maintenance unit 11Sa: source drive line 11Ga: gate drive line 12a: Gate drive circuit 13a: Source driver circuit 14a: Display Controller 1: OLED display 11: OLED display panel 111: OLED sub-pixel 112: Pixel circuit 1121: drive current generation unit 1122: Voltage maintenance unit 1123: Mode switch 11S: source drive line 11G: Gate drive line 12: Gate drive circuit 13: Source driver circuit 14: Display Controller 21: The first switch unit 211: The first switch 212: Second switch 22: Common contact 31: Second switch unit 311: The third switch 312: Fourth switch 32: Current sink unit 33: Current source unit

1 is a block diagram of a conventional OLED display; FIG. 2 is a block diagram of N pixel circuits in the i-th row of the OLED display panel of FIG. 1; 3a, 3b and 3c are schematic diagrams of circuit operation of a conventional pixel circuit; 4 is a block diagram of an OLED display integrated with an OLED pixel compensation circuit of the present invention; FIG. 5 is a block diagram of N pixel circuits in the i-th row of the OLED display panel of FIG. 4; 6a and 6b are schematic diagrams of circuit operation of a pixel circuit connected with the OLED pixel compensation circuit of the present invention; 7 is a block diagram of an OLED display integrated with an OLED pixel compensation circuit of the present invention; 8a is a block diagram of M pixel circuits in the jth column of the OLED display panel of FIG. 7; 8b is a block diagram of M pixel circuits in the jth column of the OLED display panel of FIG. 7; FIG. 9 is a block diagram of a pixel circuit connected with an OLED pixel compensation circuit of the present invention; and 10 is a block diagram of M pixel circuits in the jth column of an OLED display panel connected with an OLED pixel compensation circuit according to the present invention.

111: OLED sub-pixel

112: Pixel circuit

1121: drive current generation unit

1122: Voltage maintenance unit

1123: Mode switch

21: The first switch unit

211: The first switch

212: Second switch

22: Common contact

Claims (5)

An OLED pixel compensation circuit is applied in an OLED display panel. The OLED display panel includes N×M OLED sub-pixels and N×M pixel circuits, and each of the pixel circuits includes a driving current generating The unit and a voltage maintaining capacitor coupled to the driving current generating unit with a first end thereof; the OLED pixel compensation circuit includes: N×M first switch units, wherein each of the first switch units has a first switch unit. An electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal, the first electrical terminal and the second electrical terminal are simultaneously coupled to a common contact, the third electrical terminal The electrical terminal is coupled to a ground terminal, the fourth electrical terminal is coupled to an adjustment voltage, and the common point is coupled to a second terminal of the voltage maintaining capacitor; N×M second switch units, wherein Each of the second switch units has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal, the first electrical terminal and the second electrical terminal are at the same time coupled to the common contact, the third electrical terminal is coupled to a current sink unit, and the fourth electrical terminal is coupled to a current source unit; wherein, in a capacitor charging time interval, the first switch A first channel is formed inside the unit, so that the second terminal of the voltage maintenance capacitor is coupled to the ground terminal through the first channel, and after the voltage maintenance capacitor is charged, the first terminal of the voltage maintenance capacitor has a terminal voltage; Wherein, in a voltage maintenance time interval, a second channel is formed inside the first switch unit, so that the second end of the voltage maintenance capacitor is coupled to the adjustment voltage through the second channel, so as to utilize the adjustment voltage Adjusting the voltage of the terminal of the voltage maintaining capacitor to a driving voltage; wherein each of the first switch units includes: a first switch, which has a first terminal coupled to the first electrical terminal, and a first terminal coupled to the fourth electrical terminal. a second terminal of the electrical terminal and a control terminal coupled to a first control signal; and a second switch having a first terminal coupled to the second electrical terminal and a first terminal coupled to the third electrical terminal a second end, and a control end coupled to a second control signal; wherein the second switch forms the first channel according to the control of the second control signal in the capacitor charging time interval, and the first channel is A switch forms the second channel according to the control of the first control signal within the voltage maintaining time interval; and Wherein, each of the second switch units includes: a third switch having a first end coupled to the first electrical end, a second end coupled to the fourth electrical end, and a third control a control terminal of the signal; and a fourth switch having a first terminal coupled to the second electrical terminal, a second terminal coupled to the third electrical terminal, and a control terminal coupled to a fourth control signal end. An OLED pixel compensation circuit is applied in an OLED display panel. The OLED display panel includes N×M OLED sub-pixels and N×M pixel circuits, and each of the pixel circuits includes a driving current generating the unit and a voltage sustaining capacitor coupled to the driving current generating unit with a first end thereof; the OLED pixel compensation circuit includes: a signal transmission line coupled to a second end of the N×M voltage sustaining capacitors and N switch units, wherein each of the switch units has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal, the first electrical terminal and The second electrical terminal is simultaneously coupled to a common contact, the third electrical terminal is coupled to a ground terminal, the fourth electrical terminal is coupled to an adjustment voltage, and the common contact is coupled to the signal transmission line ; N second switch units, wherein each of the second switch units has a first electrical terminal, a second electrical terminal, a third electrical terminal and a fourth electrical terminal, the first electrical terminal The terminal and the second electrical terminal are simultaneously coupled to the common contact, the third electrical terminal is coupled to a current sink unit, and the fourth electrical terminal is coupled to a current source unit; wherein a capacitor During the charging time interval, a first channel is formed inside the switch unit, so that the second end of the voltage maintaining capacitor is coupled to the ground terminal through the signal transmission line and the first channel, so that the voltage maintaining capacitor is charged Then, the first terminal has a terminal voltage; wherein, within a voltage maintenance time interval, a second channel is formed inside the switch unit, so that the second terminal of the voltage maintenance capacitor passes through the signal transmission line and all The second channel is coupled to the adjustment voltage, so that the voltage of the terminal of the voltage maintaining capacitor is adjusted to a driving voltage by the adjustment voltage; wherein, each of the switch units includes: a first switch, which is coupled to the first switch. a first end of the electrical terminal, a second terminal coupled to the fourth electrical terminal, and a control terminal coupled to a first control signal; and a second switch having a second terminal coupled to the second electrical terminal a first end, a second end coupled to the third electrical end, and a control end coupled to a second control signal; wherein the second switch is charged in the capacitor The first channel is formed according to the control of the second control signal in the time interval, and the second channel is formed by the first switch according to the control of the first control signal in the voltage maintenance time interval; and wherein , each of the second switch units includes: a third switch with a first end coupled to the first electrical end, a second end coupled to the fourth electrical end, and a third control signal and a fourth switch, having a first end coupled to the second electrical end, a second end coupled to the third electrical end, and a control end coupled to a fourth control signal . An OLED display, comprising the OLED pixel compensation circuit according to any one of claim 1 to claim 2. An information processing device has a central processing unit and the OLED display according to claim 3, wherein the central processing unit is used for communicating with the at least one display driving chip. The information processing device according to claim 4, which is a device selected from the group consisting of a smart phone, a tablet computer and a wearable device.

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