Pixel circuit, display component and electronic device

Abstract

The application discloses a pixel circuit, a display assembly and an electronic device, and belongs to the technical field of circuits. The pixel circuit comprises a light-emitting element; a switching assembly connected with the light-emitting element, the switching assembly comprising a capacitor, a driving switch tube and a first switch tube, a first end of the capacitor being connected with a control end of the driving switch tube, a first end of the driving switch tube being connected with a second end of the first switch tube; and a control module connected with the switching assembly and used for adjusting the voltage of at least one port of a first end of the first switch tube and a second end of the capacitor according to a detected light intensity, so that the voltage of the first end of the first switch tube and the second end of the capacitor is negatively correlated with the detected light intensity.

Description

Technical Field

[0001] This application belongs to the field of circuit technology, specifically relating to a pixel circuit, a display component, and an electronic device. Background Technology

[0002] OLED (Organic Light-Emitting Diode), also known as organic electroluminescence display or organic light-emitting semiconductor (Organic Electroluminescence Display OLED), is a type of current-driven organic light-emitting device.

[0003] In related technical solutions, placing an infrared sensor under the OLED screen can achieve the function of preventing accidental touches in standby mode.

[0004] However, the infrared light emitted by the infrared emitting unit, used in conjunction with the infrared sensor, is emitted into space through the OLED screen and also illuminates the driver switch within the OLED screen. The driver switch is a crucial and sensitive component controlling the grayscale of the OLED display. When illuminated, its temperature rises, causing bright or dark spots to appear on the OLED screen, thus affecting its display performance. Summary of the Invention

[0005] The purpose of this application is to provide a pixel circuit, display component, and electronic device that can improve the problem of bright or dark spots appearing on OLED screens due to interference from infrared sensing components, thus affecting the display effect of OLED screens.

[0006] In a first aspect, embodiments of this application provide a pixel circuit, comprising: a light-emitting element; a switching assembly connected to the light-emitting element, the switching assembly including a capacitor, a driving switch transistor, and a first switch transistor, the first end of the capacitor being connected to the control terminal of the driving switch transistor, and the first end of the driving switch transistor being connected to the second end of the first switch transistor; and a control module connected to the switching assembly, configured to adjust the voltage of at least one port of the first end of the first switch transistor and the second end of the capacitor according to the detected light intensity, such that the voltage of the first end of the first switch transistor and the second end of the capacitor are negatively correlated with the detected light intensity.

[0007] Secondly, embodiments of this application provide a display component, including: a display screen and pixel circuits as described above.

[0008] Thirdly, embodiments of this application provide an electronic device, including: the display component as described above.

[0009] In this embodiment, the pixel circuit includes a light-emitting element, a switching assembly, and a control module. Specifically, the switching assembly includes a driving switch transistor, a capacitor, and a first switch transistor. By setting up a control module, the control module can sense light intensity and adjust the voltage at the first terminal of the first switch transistor, or the voltage at the second terminal of the capacitor, or simultaneously adjust the voltage at the first terminal of the first switch transistor and the second terminal of the capacitor based on the sensed light intensity. Thus, when the sensed light intensity increases, the voltage at the first terminal of the first switch transistor and the second terminal of the capacitor can be reduced to effectively improve the problem of bright or dark spots on the light-emitting element, thereby improving the display effect. Attached Figure Description

[0010] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0011] Figure 1 This is a schematic diagram of the pixel circuit topology in the relevant technical solution;

[0012] Figure 2 This is one of the topological schematic diagrams of the pixel circuit according to the embodiments of this application;

[0013] Figure 3 This is a second topological schematic diagram of the pixel circuit according to an embodiment of this application;

[0014] Figure 4 This is the third topological schematic diagram of the pixel circuit in the embodiments of this application;

[0015] Figure 5 This is the fourth topological schematic diagram of the pixel circuit according to the embodiments of this application.

[0016] Appendix Figure 1 The mark:

[0017] OLED' light-emitting element, CSt' capacitor, DTFT' driving switch, Q1' first switch, Q2' second switch, Q3' third switch, Q4' fourth switch, Q5' fifth switch, Q6' sixth switch, ELVDD power supply terminal, EM(n) first connection terminal, Vinit second connection terminal, Reset(n) third connection terminal, Gate(n-1) fourth connection terminal, Gate(n) fifth connection terminal, Data(n) data access terminal.

[0018] Appendix Figure 2 To be continued Figure 5 The mark:

[0019] OLED light-emitting element, CSt capacitor, 100 switching assembly, 200 control module, 300 first control circuit, 400 second control circuit, DTFT driving switch, Q1 first switch, Q2 second switch, Q3 third switch, Q4 fourth switch, Q5 fifth switch, Q6 sixth switch, R1 first resistor, R2 second resistor, R3 third resistor, R4 fourth resistor, R5 fifth resistor, R6 sixth resistor, R7 seventh resistor, R8 eighth resistor, RL1 first photoresistor, RL2 second photoresistor, RL3 third photoresistor, RL4 fourth photoresistor, A1 first operational amplifier, A2 second operational amplifier, 302 first photosensitive device, 402 second photosensitive device, VTL1 first phototransistor, VTL2 second phototransistor, EM(n) first connection terminal, Vinit second connection terminal, Reset(n) third connection terminal, Gate(n-1) fourth connection terminal, Gate(n) fifth connection terminal, Data(n) data input terminal, ELVDD power supply terminal. Detailed Implementation

[0020] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] The following is combined with Figure 1The diagram describes the topology of the pixel circuit in the relevant technical solution. The pixel circuit uses a 7T1C circuit as an example. Specifically, as shown... Figure 1 As shown, the 7T1C circuit includes: a driving switch DTFT', a first switch Q1', a second switch Q2', a third switch Q3', a fourth switch Q4', a fifth switch Q5', a sixth switch Q6', a capacitor Cst', and a light-emitting element OLED.

[0024] Specifically, the first terminal of capacitor Cst' is connected to the control terminal of driving switch DTFT', the first terminal of driving switch DTFT' is connected to the second terminal of first switch Q1', the first terminal of second switch Q2' is connected to the second terminal of capacitor Cst', and the second terminal of second switch Q2' is connected to the first terminal of driving switch DTFT'; the first terminal of third switch Q3' is connected to the second terminal of driving switch DTFT', the second terminal of third switch Q3' is connected to the anode of light-emitting element OLED, the control terminals of second switch Q2' and third switch Q3' are connected and then connected to the first connection terminal, and the cathode of light-emitting element OLED is grounded; the fourth switch Q4'... The first end of the fourth switch Q4' is connected to the second connection terminal Vinit; the second end of the fourth switch Q4' is connected to the second end of the third switch Q3'; the control terminal of the fourth switch Q4' is connected to the third connection terminal Reset(n); the second end of the fifth switch Q5' is connected to the first end of the fourth switch Q4'; the control terminal of the fifth switch Q5' is connected to the fourth connection terminal Gate(n-1); the first end of the sixth switch Q6' is connected to the second end of the driving switch DTFT'; the second end of the sixth switch Q6' is connected to the first end of the fifth switch Q5'; the control terminal of the sixth switch Q6' is connected to the control terminal of the first switch Q1' and then connected to the fifth connection terminal Gate(n).

[0025] Among them, the driving switch DTFT' is the main MOS transistor that drives the light-emitting element OLED; the fifth switch Q5' and the fourth switch Q4' are used for initialization capacitor Cst' and ground terminal ELVSS; the first switch Q1' is used to control the data input terminal Data(n) to input to the main MOS transistor; the sixth switch Q6' is used to form a compensation Vth circuit with the first switch Q1' and the driving switch DTFT'; the second switch Q2' and the third switch Q3' are used to control the main MOS transistor under the control of the first connection terminal EM(n), thereby realizing functions such as compensation and DC dimming.

[0026] Specifically, the timing sequence of the 7T1C circuit is divided into three stages: reset, capacitor charging, and light emission from the light-emitting element.

[0027] During the reset phase: the third connection terminal Reset(n) and the fourth connection terminal Gate(n-1) are pulled low, and the data input terminal Gate(n) and the first connection terminal EM(n) are pulled high. At this time, the fifth switch Q5' and the fourth switch Q4' are turned on, and the sixth switch Q6', the second switch Q2', the third switch Q3' and the first switch Q1' are turned off, thus cutting off the OLED circuit.

[0028] During the capacitor charging phase: the fifth terminal Gate(n) is pulled low, and the third terminal Reset(n), the fourth terminal Gate(n-1), and the first terminal EM(n) are pulled high. At this time, the sixth switch Q6' and the first switch Q1' are turned on, and the second switch Q2', the third switch Q3', the fifth switch Q5', and the fourth switch Q4' are turned off. The data input terminal Data(n) starts charging the capacitor Cst'. Since the conduction condition of the driving switch DTFT' is |Vgs|>|Vth|, when the voltage at point A, that is, the voltage at the control terminal of the driving switch DTFT', is Vdata+Vth, the driving switch DTFT' is turned off.

[0029] During the light-emitting stage of the light-emitting element: the first connection terminal EM(n) is pulled low, and the third connection terminal Reset(n), the fourth connection terminal Gate(n-1), and the fifth connection terminal Gate(n) are pulled high. The second switch Q2' and the third switch Q3' are turned on, and the sixth switch Q6', the fifth switch Q5', the fourth switch Q4', and the first switch Q1' are turned off. The driving switch DTFT' is driven according to the voltage at the control terminal of the driving switch DTFT', and the light-emitting element OLED circuit is turned on, and it begins to emit light.

[0030] The on-current of the driving switch DTFT' is expressed as follows:

[0031] Vs = ELVDD(1);

[0032] Vg=Vdata+Vth1(2);

[0033] Where Vs is the voltage given to drive the switching transistor DTFT', Vg is the voltage at the control terminal of the driving switching transistor DTFT', Vdata is the voltage at the first terminal of the first switching transistor, and Vth1 is the value of Vth during the capacitor charging stage.

[0034] I = K × (Vgs - Vth)2(3);

[0035] I is the on-state current driving the DTFT', K is a coefficient, and Vgs is the voltage between the gate and source of the DTFT', which can be represented by Vg.

[0036] Specifically, based on formulas (1), (2), and (3), formula (3) can be rewritten as:

[0037] I=K×[(Vdata+Vth1)-(ELVDD+Vth2)]2(4)

[0038] Without the influence of infrared light, Vth1 = Vth2, then formula (4) can be expressed as formula (5):

[0039] I = K × (Vdata - ELVDD)²(5)

[0040] Clearly, the on-state current I of the driving switch DTFT' is related to the voltages Vdata and ELVDD.

[0041] Specifically, when the infrared emitting unit under the OLED screen is working, the light generates heat. If the driving switch DTFT' is a PMOS, then Vth is negative, and the |Vth| threshold of the driving switch DTFT decreases as the temperature increases.

[0042] When the thermal effect caused by the infrared emitting unit lasts during the charging stage of the capacitor Cst', the |Vth| threshold of the driving switch DTFT' decreases due to temperature, and the voltage is higher than when there is no thermal effect. When the timing is in the OLED light-emitting stage, the thermal effect caused by the infrared emitting unit under the screen disappears, and the |Vth| threshold of the driving switch DTFT' recovers. At this time, the |Vgs| of the driving switch DTFT' is slightly less than |Vth|, and the driving switch DTFT' is in "micro-conduction". The OLED circuit current is small, the light emission brightness is dim, and the screen appears as a "dark spot".

[0043] When the thermal effect caused by the infrared emitting unit lasts during the light-emitting stage of the light-emitting element, the threshold value of |Vth| of the driving switch transistor DTFT' decreases due to temperature. At this time, |Vgs| of the driving switch transistor DTFT' must be greater than |Vth|. According to the formula for calculating the conduction current of the driving switch transistor DTFT': I=K×(|Vgs|-|Vth|)2, the OLED circuit current is too large, the light emission brightness is too bright, and the screen appears as a "bright spot".

[0044] The following is combined with Figures 2 to 5 This application describes pixel circuits, display components, and electronic devices according to embodiments thereof.

[0045] In some embodiments of this application, such as Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a pixel circuit is proposed, including: an OLED light-emitting element; a switching assembly 100 connected to the OLED light-emitting element, the switching assembly 100 including a capacitor CSt, a driving switch DTFT, and a first switch Q1, the first terminal of the capacitor CSt being connected to the control terminal of the driving switch DTFT, and the first terminal of the driving switch DTFT being connected to the second terminal of the first switch Q1; and a control module 200 connected to the switching assembly 100, used to adjust the voltage of at least one port of the first terminal of the first switch Q1 and the second terminal of the capacitor CSt according to the detected light intensity, so that the voltage of the first terminal of the first switch Q1 and the second terminal of the capacitor CSt is negatively correlated with the detected light intensity.

[0046] In this embodiment, the pixel circuit includes an OLED light-emitting element, a switching assembly 100, and a control module 200. Specifically, the switching assembly 100 includes a driving switching transistor DTFT, a capacitor CSt, and a first switching transistor Q1. By setting the control module 200, the control module 200 can sense the light intensity and adjust the voltage of the first terminal of the first switching transistor Q1, or the second terminal of the capacitor CSt, or simultaneously adjust the voltage of the first terminal of the first switching transistor Q1 and the second terminal of the capacitor CSt based on the sensed light intensity. Thus, when the sensed light intensity increases, the voltage of the first terminal of the first switching transistor Q1 and the second terminal of the capacitor CSt can be reduced to effectively improve the problem of bright or dark spots on the OLED light-emitting element, thereby improving the display effect.

[0047] Specifically, as described above, when the light emitted by the infrared emitting unit illuminates the driving switch transistor DTFT, the Vth of the driving switch transistor DTFT increases. By setting the control module 200, it can adjust the voltage of the first terminal of the first switch transistor Q1 and / or the voltage of the second terminal of the capacitor CSt according to the sensed light intensity. The adjusted voltage of the first terminal of the first switch transistor Q1 and / or the voltage of the second terminal of the capacitor CSt will reduce the voltage at the control terminal of the driving switch transistor DTFT. By adjusting the voltage of the first terminal of the first switch transistor Q1 and / or the voltage of the second terminal of the capacitor CSt, the increase in Vth of the driving switch transistor DTFT is offset, so as to ensure that the voltage at the control terminal of the driving switch transistor DTFT remains unchanged. Compared with the absence of the influence of the light emitted by the infrared emitting unit, the pixel circuit proposed in this application can keep the voltage at the control terminal of the driving switch transistor DTFT unchanged, thereby improving the problem of bright spots or dark spots on the OLED light-emitting element caused by the influence of the light emitted by the infrared emitting unit, and thus improving the display effect.

[0048] In some embodiments of this application, the light-emitting element OLED is an organic light-emitting semiconductor.

[0049] In some embodiments of this application, the control module 200 includes at least one of the following: a first control circuit 300, the input terminal of which is used to apply an enable voltage, the output terminal of which is connected to the first terminal of the first switching transistor Q1, the first control circuit 300 including a first photosensitive device 302, and the voltage at the output terminal of the first control circuit 300 being negatively correlated with the light intensity detected by the first photosensitive device 302; and a second control circuit 400, the input terminal of which is used to apply a supply voltage, the output terminal of which is connected to the second terminal of the capacitor CSt, the second control circuit 400 including a second photosensitive device 402, and the voltage at the output terminal of the second control circuit 400 being negatively correlated with the light intensity detected by the second photosensitive device 402.

[0050] In some embodiments of this application, the input terminal of the first control circuit 300 is connected to the data input terminal Data(n) so that an enable voltage is applied to the input terminal of the first control circuit 300 based on the data input terminal Data(n).

[0051] In this embodiment, the input terminal of the first control circuit 300 is connected to the data input terminal Data(n), and the output terminal of the first control circuit 300 is connected to the first terminal of the first switching transistor Q1. Therefore, the voltage of the first terminal of the first switching transistor Q1 can be adjusted using the first control circuit 300.

[0052] The first terminal of the first switch Q1 is the port that provides power to the capacitor CSt during the charging process. The first control circuit 300 includes a first photosensitive device 302 to sense the light intensity. Based on the sensed light intensity, the voltage of the output terminal of the first control circuit 300 is adjusted so that the voltage of the first terminal of the first switch Q1 connected to the output terminal of the first control circuit 300 can be reduced when the sensed light intensity increases.

[0053] During this process, the voltage at the control terminal of the driving switch DTFT can be reduced during the charging of capacitor CSt, thereby reducing the occurrence of micro-conduction in the driving switch DTFT during the capacitor CSt charging stage. When micro-conduction does not occur in the driving switch DTFT, the OLED can emit light at its original brightness, overcoming the generation of dark spots and thus improving the screen's display effect.

[0054] Similarly, the input terminal of the second control circuit 400 is connected to the power supply terminal ELVDD, which applies the power supply voltage. The power supply voltage is then applied to the input terminal of the second control circuit 400 based on the power supply terminal ELVDD. The output terminal of the first control circuit 300 is connected to the second terminal of the capacitor CSt. Therefore, the voltage at the second terminal of the capacitor CSt can be adjusted using the second control circuit 400.

[0055] During this process, the second control circuit 400 can be used to improve the brightness of the OLED during the OLED light-emitting stage, enabling the OLED to emit light at its original brightness, overcoming the generation of dark spots, thereby improving the display effect of the screen.

[0056] In some embodiments of this application, the control module 200 includes a first control circuit 300.

[0057] In some embodiments of this application, the control module 200 includes a second control circuit 400.

[0058] In some embodiments of this application, the control module 200 includes a first control circuit 300 and a second control circuit 400.

[0059] In some embodiments of this application, such as Figure 2 As shown, the first photosensitive device 302 includes a first photoresistor RL1 and a second photoresistor RL2. The first control circuit 300 includes: a first operational amplifier A1, the output terminal of the first operational amplifier A1 is connected to the first terminal of the first switching transistor Q1, the positive input terminal of the first operational amplifier A1 is connected to the first terminal of the first photoresistor RL1, the output terminal of the first operational amplifier A1 is connected to the second terminal of the first photoresistor RL1, the negative input terminal of the first operational amplifier A1 is connected to the first terminal of the second photoresistor RL2, and the second terminal of the second photoresistor RL2 is grounded. A first resistor R1 has its first end used to apply a reference enable voltage, and its second end connected to the positive input terminal of a first operational amplifier A1. A second resistor R2 has its first end used to apply an enable voltage, and its second end connected to the negative input terminal of the first operational amplifier A1. At different times, the voltage difference between the voltage applied to the first end of the first resistor R1 and the voltage applied to the first end of the second resistor R2 is the same. The resistance values ​​of the first photoresistor RL1 and the second photoresistor RL2 are negatively correlated with the light intensity.

[0060] In this embodiment, the first photoresistor RL1 and the second photoresistor RL2, also known as photoresistors, are components whose resistance changes according to the light intensity; they are photosensitive elements.

[0061] Specifically, the principle of photoresistors is based on the photosensitive effect, which is the electronic behavior of semiconductor materials after being excited by photon energy.

[0062] In some embodiments of this application, the photoresistor is generally fabricated on materials such as zinc oxide (ZnO), cadmium sulfide (CdS), lead selenide (PbSe), and cadmium telluride (CdTe). When these materials are illuminated, electrons are excited into the conduction band, thereby reducing resistance. The charge carriers generated by illumination participate in conduction and drift under the influence of an applied electric field. Electrons move towards the positive terminal of the power supply, and holes move towards the negative terminal, causing the resistance of the photoresistor to decrease rapidly.

[0063] Based on this, light intensity can be sensed by setting a first photoresistor RL1 and a second photoresistor RL2, and then represented in the form of resistance value. The voltage at the first terminal of the first switch Q1 can be adjusted by using the resistance change of the first control circuit 300 where the first photoresistor RL1 and the second photoresistor RL2 are located.

[0064] In some embodiments of this application, the ratio of the resistance value of the first photoresistor to the first resistor is a first ratio, and the ratio of the resistance value of the second photoresistor to the second resistor is a second ratio; wherein, the first ratio is equal to the second ratio.

[0065] Specifically, the relationship between the resistance values ​​of the first photoresistor RL1, the second photoresistor RL2, the first resistor R1, and the second resistor R2 is shown in formula (6):

[0066]

[0067] The output of the first control circuit 300 is represented by U1, and the formula for calculating U1 (7) is as follows:

[0068]

[0069] Among them, U Data It is the voltage input to the data input terminal Data(n), that is, the energy voltage, U. Ref_ Data is the reference enable voltage, i.e., U Ref_ Data(n).

[0070] When the first photoresistor RL1 and the second photoresistor RL2 are irradiated with infrared light, their resistance values ​​decrease, while the resistance values ​​of the first resistor R1 and the second resistor R2 remain unchanged. Therefore, the voltage output from the first control circuit 300 decreases. During the charging phase of capacitor CSt, the voltage U at the control terminal of the driving switch transistor DTFT... A=U1+Vth1. When exposed to infrared light, Vth increases while U1 decreases. This cancels out the increase in Vth caused by the driving switch DTFT, ensuring that the voltage at the control terminal of the driving switch DTFT remains unchanged, i.e., it does not change with infrared light irradiation, thereby eliminating dark spots and improving the display effect.

[0071] In some embodiments of this application, such as Figure 2 As shown, the second photosensitive device 402 includes a third photoresistor RL3 and a fourth photoresistor RL4. The second control circuit 400 includes: a second operational amplifier A2, the output terminal of which is connected to the second terminal of capacitor CSt; the positive input terminal of the second operational amplifier A2 is connected to the first terminal of the third photoresistor RL3; the output terminal of the second operational amplifier A2 is connected to the second terminal of the third photoresistor RL3; the negative input terminal of the second operational amplifier A2 is connected to the first terminal of the fourth photoresistor RL4; and the second terminal of the fourth photoresistor RL4 is grounded. Three resistors R3, the first end of the third resistor R3 is used to apply a reference supply voltage, and the second end of the third resistor R3 is connected to the positive input terminal of the second operational amplifier A2; a fourth resistor R4, the first end of the fourth resistor R4 is used to apply a supply voltage, and the second end of the fourth resistor R4 is connected to the negative input terminal of the second operational amplifier A2; wherein, at different times, the voltage difference between the voltage applied to the first end of the third resistor R3 and the voltage applied to the first end of the fourth resistor R4 is the same, and the resistance values ​​of the third photoresistor RL3 and the fourth photoresistor RL4 are negatively correlated with the light intensity.

[0072] Based on this, light intensity can be sensed by setting a third photoresistor RL3 and a fourth photoresistor RL4, and then represented in the form of resistance value. The voltage at the second terminal of capacitor CSt can be adjusted by using the resistance change of the second control circuit 400 where the third photoresistor RL3 and the fourth photoresistor RL4 are located.

[0073] In some embodiments of this application, the ratio of the resistance value of the third photoresistor to the third resistor is a third ratio, and the ratio of the resistance value of the fourth photoresistor to the fourth resistor is a fourth ratio; wherein, the third ratio is equal to the fourth ratio.

[0074] Specifically, the resistance values ​​of the third photoresistor RL3, the fourth photoresistor RL4, the third resistor R3, and the fourth resistor R4 are related as shown in formula (8):

[0075]

[0076] The output of the second control circuit 400 is represented by U2, and the formula for calculating U2 (9) is as follows:

[0077]

[0078] Among them, U ELVDD It is the voltage input at the power supply terminal ELVDD, that is, the supply voltage, U Ref This is the reference supply voltage.

[0079] When the third photoresistor RL3 and the fourth photoresistor RL4 are illuminated by infrared light, their resistance values ​​decrease, while the resistance values ​​of the third resistor R3 and the fourth resistor R4 remain unchanged. Therefore, the output voltage of the second control circuit 400 decreases. Ignoring the forward voltage drop U2 = U... g |Vgs|=|U g -U A As |Vth| decreases synchronously, it cancels out the increase in Vth caused by the driving switch DTFT, ensuring that the voltage at the control terminal of the driving switch DTFT remains unchanged, that is, it does not change with infrared light irradiation, thereby eliminating dark spots and improving the display effect.

[0080] In some embodiments of this application, such as Figure 5 As shown, the first photosensitive device 302 includes a first phototransistor VTL1, and the first control circuit 300 includes: a fifth resistor R5, the first end of which is used to apply an enable voltage, and the second end of which is connected to the first end of the first phototransistor VTL1, the second end of which is grounded; a first transistor, the first end of which is connected to the first end of the fifth resistor R5, and the control terminal of which is connected to the second end of the fifth resistor R5; and a sixth resistor R6, the first end of which is connected to the second end of the first transistor and the first end of the first switch Q1, the second end of which is grounded; wherein, the resistance value of the first phototransistor VTL1 is negatively correlated with the light intensity.

[0081] In this embodiment, the first photosensitive device 302 can also be a phototransistor, specifically a first phototransistor VTL1. The substrate region of the phototransistor is composed of a photosensitive material, such as indium selenide (InSe) or thallium selenide (Tl2Se). Under illumination, external light pulses generate electron-hole pairs after passing through the photosensitive material layer, thereby enhancing the conductivity and reducing the resistance of the phototransistor, thus strengthening the current signal.

[0082] Specifically, the base voltage of the first phototransistor VTL1 is as shown in formula (10):

[0083]

[0084] Among them, U b It is the base voltage of the first phototransistor VTL1, R ecIt is the resistance value between the emitter and collector of the first phototransistor VTL1, U. Data It is the voltage input at the data input terminal Data(n).

[0085] The base current of the first phototransistor VTL1 is shown in formula (11):

[0086] I b =f(U be (11)

[0087] Among them, I b It is the base current of the first phototransistor VTL1, and f is U be with I b The function between, U be It is the voltage between the emitter and collector of the first phototransistor VTL1.

[0088] The emitter circuit of the first phototransistor VTL1 is shown in formula (12):

[0089] I e =I b +I c (12)

[0090] Among them, I e It is the emitter current (I) of the first phototransistor VTL1. c It is the collector current of the first phototransistor VTL1.

[0091] Based on this, the output terminal of the first control circuit 300 is represented by U1 using formula (13):

[0092] U1=U e =I e R6(13)

[0093] Among them, U e It is the collector voltage of the first phototransistor VTL1.

[0094] Specifically, when there is no infrared light, the R of the first phototransistor VTL1... ec Larger; while under light, R ec Decrease, U b To reduce the size, in the relevant technical solution, the first phototransistor VTL1 U be =0.7V, therefore U1 decreases; during the charging phase of capacitor CSt, the voltage U at the control terminal of the driving switch DTFT is... A = U1 + Vth1, where Vth increases and U1 decreases under infrared illumination. In the embodiments of this application, it can be guaranteed that U... AThis ensures that the voltage at the control terminal of the DTFT driving switch remains constant, meaning it does not change with infrared light irradiation, thereby eliminating dark spots and improving display performance.

[0095] In some embodiments of this application, such as Figure 5 As shown, the second photosensitive device 402 includes a second photosensitive transistor VTL2, and the second control circuit 400 includes: a seventh resistor R7, the first end of which is used to apply a supply voltage, and the second end of which is connected to the first end of the second photosensitive transistor VTL2, the second end of which is grounded; a second transistor, the first end of which is connected to the first end of the seventh resistor R7, and the control terminal of which is connected to the second end of the seventh resistor R7; and an eighth resistor R8, the first end of which is connected to the second end of the second transistor and the second end of the capacitor CSt, the second end of which is grounded; wherein, the resistance value of the second photosensitive transistor VTL2 is negatively correlated with the light intensity.

[0096] In this embodiment, the working principle of the second phototransistor VTL2 is the same as that of the first phototransistor VTL1. During the OLED light-emitting stage, if the driving switch DTFT is exposed to infrared light, the voltage at the output of the second control circuit 400 will also decrease. This ensures that the voltage |Vgs|-|Vth| does not change with the light, so that the emitting current of the OLED does not change with the light, thereby improving the problem of bright spots and ensuring the effect.

[0097] In some embodiments of this application, the switching assembly 100 further includes: a second switch Q2, the first end of which is connected to the second end of the capacitor CSt, and the second end of which is connected to the first end of the driving switch DTFT; a third switch Q3, the first end of which is connected to the second end of the driving switch DTFT, and the second end of which is connected to the anode of the light-emitting element OLED; the control terminals of the second switch Q2 and the third switch Q3 are connected and then connected to the first connection terminal EM(n); the cathode of the light-emitting element OLED is grounded; and a fourth switch Q4, the first end of which is connected to the second connection terminal Vi. The fourth switch Q4 is connected to the second terminal of the third switch Q3, and the control terminal of the fourth switch Q4 is connected to the third connection terminal Reset(n). The fifth switch Q5 is connected to the first terminal of the fourth switch Q4, and the control terminal of the fifth switch Q5 is connected to the fourth connection terminal Gate(n-1). The sixth switch Q6 is connected to the second terminal of the driving switch DTFT, and the second terminal of the sixth switch Q6 is connected to the first terminal of the fifth switch Q5. The control terminal of the sixth switch Q6 is connected to the control terminal of the first switch Q1 and then connected to the fifth connection terminal Gate(n).

[0098] In this embodiment, during the reset phase: the third connection terminal Reset(n) and the fourth connection terminal Gate(n-1) are pulled low, and the data input terminal Data(n) and the first connection terminal EM(n) are pulled high. At this time, the fifth switch Q5 and the fourth switch Q4 are turned on, and the sixth switch Q6, the second switch Q2, the third switch Q3 and the first switch Q1 are turned off, thus cutting off the OLED circuit.

[0099] like Figure 3 As shown, during the capacitor charging stage: the fifth connection terminal Gate(n) is pulled low, and the third connection terminal Reset(n), the fourth connection terminal Gate(n-1), and the first connection terminal EM(n) are pulled high. At this time, the sixth switch Q6 and the first switch Q1 are turned on, and the second switch Q2, the third switch Q3, the fifth switch Q5, and the fourth switch Q4 are turned off. The data input terminal Data(n) starts charging the capacitor Cst. Since the conduction condition of the driving switch DTFT is |Vgs|>|Vth|, when the voltage at point A, that is, the voltage at the control terminal of the driving switch DTFT, is Vdata+Vth, the driving switch DTFT is turned off.

[0100] like Figure 4As shown, during the light-emitting stage of the light-emitting element: the first connection terminal EM(n) is pulled low, and the third connection terminal Reset(n), the fourth connection terminal Gate(n-1), and the fifth connection terminal Gate(n) are pulled high. The second switch Q2 and the third switch Q3 are turned on, and the sixth switch Q6, the fifth switch Q5, the fourth switch Q4, and the first switch Q1 are turned off. The driving switch DTFT is driven according to the voltage at the control terminal of the driving switch DTFT, and the light-emitting element OLED circuit is turned on, and it begins to emit light.

[0101] In some embodiments of this application, the light-emitting element is a light-emitting diode.

[0102] In some embodiments of this application, a display component is proposed, including: a display screen; and pixel circuitry as described above.

[0103] In some embodiments of this application, an electronic device is proposed, including a display component as described above.

[0104] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0105] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A pixel circuit, characterized in that, include: Light-emitting elements; A switching assembly is connected to the light-emitting element. The switching assembly includes a capacitor, a driving switch transistor, and a first switch transistor. The first end of the capacitor is connected to the control end of the driving switch transistor, and the first end of the driving switch transistor is connected to the second end of the first switch transistor. A control module, connected to the switching assembly, is used to adjust the voltage of at least one of the first terminals of the first switch transistor and the second terminal of the capacitor according to the detected light intensity of the infrared light emitted by the infrared emitting unit under the OLED screen, so that the voltage of the first terminal of the first switch transistor and the second terminal of the capacitor are negatively correlated with the detected light intensity. The control module includes: A first control circuit, wherein the input terminal of the first control circuit is used to apply an enable voltage, the output terminal of the first control circuit is connected to the first terminal of the first switching transistor, the first control circuit includes a first photosensitive device, and the voltage at the output terminal of the first control circuit is negatively correlated with the light intensity detected by the first photosensitive device; The second control circuit has an input terminal for applying a power supply voltage and an output terminal connected to the second terminal of the capacitor. The second control circuit includes a second photosensitive device, and the voltage at the output terminal of the second control circuit is negatively correlated with the light intensity detected by the second photosensitive device.

2. The pixel circuit according to claim 1, characterized in that, The first photosensitive device includes a first photoresistor and a second photoresistor, and the first control circuit includes: A first operational amplifier, the output terminal of which is connected to the first terminal of the first switching transistor, the positive input terminal of which is connected to the first terminal of the first photoresistor, the output terminal of which is connected to the second terminal of the first photoresistor, the negative input terminal of which is connected to the first terminal of the second photoresistor, and the second terminal of the second photoresistor is grounded. A first resistor, the first end of which is used to apply a reference enable voltage, and the second end of which is connected to the positive input terminal of the first operational amplifier; The second resistor has a first end used to apply the enable voltage and a second end connected to the negative input terminal of the first operational amplifier. At different times, the voltage difference between the voltage applied to the first end of the first resistor and the voltage applied to the first end of the second resistor is the same, and the resistance values ​​of the first photoresistor and the second photoresistor are negatively correlated with the light intensity.

3. The pixel circuit according to claim 2, characterized in that, The ratio of the resistance value of the first photoresistor to the first resistor is a first ratio, and the ratio of the resistance value of the second photoresistor to the second resistor is a second ratio. Wherein, the first ratio is equal to the second ratio.

4. The pixel circuit according to claim 1, characterized in that, The second photosensitive device includes a third photoresistor and a fourth photoresistor, and the second control circuit includes: The second operational amplifier has its output terminal connected to the second terminal of the capacitor, its positive input terminal connected to the first terminal of the third photoresistor, its output terminal connected to the second terminal of the third photoresistor, its negative input terminal connected to the first terminal of the fourth photoresistor, and the second terminal of the fourth photoresistor grounded. The third resistor has a first end used to apply a reference supply voltage and a second end connected to the positive input terminal of the second operational amplifier. A fourth resistor, the first end of which is used to apply the supply voltage, and the second end of which is connected to the negative input terminal of the second operational amplifier; Specifically, at different times, the voltage difference between the voltage applied to the first end of the third resistor and the voltage applied to the first end of the fourth resistor is the same, and the resistance values ​​of the third photoresistor and the fourth photoresistor are negatively correlated with the light intensity.

5. The pixel circuit according to claim 4, characterized in that, The ratio of the resistance value of the third photoresistor to the third resistor is the third ratio, and the ratio of the resistance value of the fourth photoresistor to the fourth resistor is the fourth ratio. The third ratio is equal to the fourth ratio.

6. The pixel circuit according to claim 1, characterized in that, The first photosensitive device includes a first phototransistor, and the first control circuit includes: The fifth resistor has a first end used to apply the enabling voltage, and a second end of the fifth resistor is connected to the first end of the first phototransistor, with the second end of the first phototransistor grounded. A first transistor, wherein a first terminal of the first transistor is connected to a first terminal of the fifth resistor, and a control terminal of the first transistor is connected to a second terminal of the fifth resistor; The sixth resistor has its first end connected to the second end of the first transistor and the first end of the first switching transistor, and its second end grounded. The resistance value of the first phototransistor is negatively correlated with the light intensity.

7. The pixel circuit according to claim 1, characterized in that, The second photosensitive device includes a second phototransistor, and the second control circuit includes: The seventh resistor has a first end for applying the supply voltage, and a second end for connecting to the first end of the second phototransistor, with the second end of the second phototransistor grounded. The second transistor has its first terminal connected to the first terminal of the seventh resistor, and its control terminal connected to the second terminal of the seventh resistor. The eighth resistor has its first terminal connected to the second terminal of the second transistor and the second terminal of the capacitor, and its second terminal is grounded. The resistance value of the second phototransistor is negatively correlated with the light intensity.

8. The pixel circuit according to any one of claims 2 to 7, characterized in that, The switching assembly further includes: The second switching transistor has its first end connected to the second end of the capacitor, and its second end connected to the first end of the driving switching transistor. The third switch has a first end connected to the second end of the driving switch, the second end of the third switch is connected to the anode of the light-emitting element, the control terminal of the second switch and the control terminal of the third switch are connected to the first connection terminal, and the cathode of the light-emitting element is grounded. The fourth switch is connected to the second connection terminal, the second terminal of the fourth switch is connected to the second terminal of the third switch, and the control terminal of the fourth switch is connected to the third connection terminal. The fifth switch is connected to the first end of the fourth switch, and the control end of the fifth switch is connected to the fourth connection end. The sixth switch has a first end connected to the second end of the driving switch, a second end connected to the first end of the fifth switch, a second end also connected to the control end of the driving switch, and the control end of the sixth switch is connected to the control end of the first switch and then connected to the fifth connection end.

9. The pixel circuit according to any one of claims 1 to 7, characterized in that, The light-emitting element is a light-emitting diode (LED).

10. A display component, characterized in that, include: Display screen; The pixel circuit as described in any one of claims 1 to 9.

11. An electronic device, characterized in that, include: The display component as described in claim 10.

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