Electronic device for driving pixel and control method thereof

Abstract

An electronic device is disclosed. The electronic device includes a driving unit, an inorganic light emitting element, and a pixel circuit controlling the inorganic light emitting element based on a plurality of signals output from the driving unit, where the pixel circuit may include a first circuit including a switching transistor, a first current based on a first control voltage among the plurality of signals is provided to the inorganic light emitting element through the switching transistor; and a second circuit including a charging element connected to a gate of the switching transistor, charging the charging element using a second current based on a second control voltage among the plurality of signals, and blocking the supply of the first current to the inorganic light emitting element by blocking the switching transistor when a voltage of the charging element reaches a predetermined voltage.

Description

Technical Field

[0001] This disclosure relates to electronic devices and control methods thereof, and more specifically, to electronic devices and control methods thereof for driving pixels. Background Technology

[0002] With the advancement of electronic technology, various types of electronic devices have been developed. In particular, display devices using miniature LEDs have recently been developed.

[0003] Most micro-LED displays employ a pulse width modulation (PWM) internal compensation driving method, where the peak driving current is fixed and the pulse width is adjustable. This is because, with pulse amplitude modulation (PAM) driving, the peak current varies with grayscale, resulting in color shift due to the characteristics of micro-LEDs.

[0004] In traditional PWM internal compensation drive methods, a triangular wave is used for part of the panel gate (GIP) waveform, which may cause various types of image quality problems. Summary of the Invention

[0005] [Solution to the problem]

[0006] According to one embodiment, an electronic device includes a driving unit, an inorganic light-emitting element, and a pixel circuit. The pixel circuit controls the inorganic light-emitting element based on a plurality of signals output from the driving unit. The pixel circuit includes: a first circuit including a switching transistor and providing a first current based on a first control voltage among the plurality of signals to the inorganic light-emitting element via the switching transistor; and a second circuit including a charging element connected to the gate of the switching transistor, charging the charging element with a second current based on a second control voltage among the plurality of signals, and blocking the switching transistor based on the voltage of the charging element reaching a predetermined voltage, thereby cutting off the supply of the first current to the inorganic light-emitting element.

[0007] In addition, the first circuit may also include a first driving transistor, which supplies a first initial voltage from among the multiple signals to the gate of the first driving transistor based on a reset signal from among the multiple signals, and supplies a first control voltage to the gate of the first driving transistor based on a data setting signal from among the multiple signals. Meanwhile, the second circuit may also include a second driving transistor, which supplies a first initial voltage to the gate of the second driving transistor based on a reset signal, and supplies a second control voltage to the gate of the second driving transistor based on a data setting signal.

[0008] Furthermore, the first circuit can supply a first driving voltage from a plurality of signals to the source of the first driving transistor based on the light emission signal, and provide a first current based on the gate-source voltage of the first driving transistor to the inorganic light emission element through a switching transistor. Meanwhile, the second circuit can supply a second driving voltage from a plurality of signals to the source of the second driving transistor based on the light emission signal, and charge the charging element using the second current based on the gate-source voltage of the second driving transistor.

[0009] Furthermore, the inorganic light-emitting element can emit light with a brightness corresponding to the magnitude of the first current, and the on-time of the switching transistor can be determined based on the magnitude of the second current.

[0010] Furthermore, the first current can decrease as the first control voltage increases and increase as the first control voltage decreases, and the second current can decrease as the second control voltage increases and increase as the second control voltage decreases.

[0011] Furthermore, the second circuit can supply a second initial voltage to the charging element based on a reset signal, and the second initial voltage can be a voltage that turns on the switching transistor.

[0012] Furthermore, one end of the inorganic light-emitting element can be grounded, while the other end can be connected to a switching transistor, and a first initial voltage can be supplied to the other end based on a reset signal.

[0013] In addition, the first circuit may also include a first capacitor connected to the gate of the first driving transistor, and the gate voltage of the first driving transistor can be maintained by the first capacitor. The second circuit may also include a second capacitor connected to the gate of the second driving transistor, and the gate voltage of the second driving transistor can be maintained by the second capacitor.

[0014] In addition, the charging element may include a third capacitor, and the capacitance of the third capacitor may be greater than the capacitance of each of the first capacitor and the second capacitor.

[0015] Furthermore, the W / L ratio of the first driving transistor can be greater than that of the second driving transistor.

[0016] In addition, each of the multiple signals can be a square wave signal or a DC signal.

[0017] Meanwhile, according to one embodiment, a control method for an electronic device may include: providing a first current based on a first control voltage among a plurality of signals output from a driving unit of the electronic device to an inorganic light-emitting element of the electronic device via a switching transistor; charging a charging element connected to the gate of the switching transistor using a second current based on a second control voltage among the plurality of signals; and blocking the switching transistor based on the voltage of the charging element reaching a predetermined voltage, thereby cutting off the supply of the first current to the inorganic light-emitting element.

[0018] In addition, the method may further include: supplying a first initial voltage of the plurality of signals to the gate of a first driving transistor included in a first circuit and the gate of a second driving transistor included in a second circuit based on a reset signal among the plurality of signals; and supplying a first control voltage to the gate of the first driving transistor and a second control voltage to the gate of the second driving transistor based on a data setting signal among the plurality of signals.

[0019] Furthermore, charging may include: supplying a first driving voltage of a plurality of signals to the source of a first driving transistor based on a light-emitting signal, and supplying a second driving voltage of a plurality of signals to the source of a second driving transistor; providing a first current based on the gate-source voltage of the first driving transistor to the inorganic light-emitting element through a switching transistor; and charging the charging element using the second current based on the gate-source voltage of the second driving transistor.

[0020] Furthermore, the inorganic light-emitting element can emit light with a brightness corresponding to the magnitude of the first current, and the on-time of the switching transistor can be determined based on the magnitude of the second current.

[0021] Furthermore, the first current can decrease as the first control voltage increases, and increase as the first control voltage decreases; the second current can decrease as the second control voltage increases, and increase as the second control voltage decreases.

[0022] Furthermore, supplying the first initial voltage may include supplying a second initial voltage to the charging element based on a reset signal, and the second initial voltage may be a voltage that turns on the switching transistor.

[0023] Furthermore, one end of the inorganic light-emitting element can be grounded, while the other end can be connected to a switching transistor, and a first initial voltage can be supplied to the other end based on a reset signal.

[0024] Furthermore, the gate voltage of the first driving transistor can be maintained by a first capacitor connected to the gate of the first driving transistor, and the gate voltage of the second driving transistor can be maintained by a second capacitor connected to the gate of the second driving transistor.

[0025] In addition, the charging element may include a third capacitor, and the capacitance of the third capacitor may be greater than the capacitance of each of the first capacitor and the second capacitor.

[0026] Furthermore, the W / L ratio of the first driving transistor can be greater than that of the second driving transistor.

[0027] In addition, each of the multiple signals can be a square wave signal or a DC signal. Attached Figure Description

[0028] Figures 1a to 1c These are diagrams used to explain the operation of pixel circuits in order to understand the inventive subject matter of this disclosure;

[0029] Figure 2 This is a block diagram illustrating the configuration of an electronic device according to one embodiment;

[0030] Figure 3 This is a diagram illustrating the circuit configuration of an electronic device according to one embodiment;

[0031] Figures 4 to 7 This is a diagram illustrating the operation of an electronic device according to one embodiment;

[0032] Figure 8 This is a diagram used to explain the waveform of node 3 based on grayscale according to one embodiment; and

[0033] Figure 9 This is a flowchart for explaining a control method of an electronic device according to one embodiment. Detailed Implementation

[0034] The purpose of this disclosure is to provide an electronic device and control method thereof that can drive pixel circuits without using triangular waves.

[0035] The inventive subject matter of this disclosure will be described in detail below with reference to the accompanying drawings.

[0036] Considering the functionality of this disclosure, widely used and common terms have been selected as much as possible for use in the embodiments of this disclosure. However, these terms may be modified based on the intent of those skilled in the art, judicial precedents, the emergence of new technologies, etc. Furthermore, in certain circumstances, terms arbitrarily chosen by the applicant may be included in the terminology used herein. In such cases, the meanings of these terms will be described in detail in the specification of this disclosure. Therefore, the terms used in this disclosure need to be defined based on their meanings and the specific content of the entire document, and not merely on their names.

[0037] In this disclosure, expressions such as “having,” “may have,” “include,” and “may include” indicate the presence of a corresponding feature (e.g., a value, function, operation, or element such as a component), and do not exclude the possibility of the presence of other features.

[0038] The phrase “at least one of A and / or B” should be understood as meaning either “A” or “B” or “A and B”.

[0039] The terms “first,” “second,” “first,” “second,” etc., used in this disclosure may be used to refer to various elements regardless of their order and / or importance, and are used only to distinguish one element from another, not to limit the elements.

[0040] In this disclosure, unless otherwise expressly stated, the singular form also includes the plural form. In this disclosure, terms such as "comprising" or "consisting of" indicate the presence of the described features, quantities, steps, operations, elements, components, or combinations thereof, but do not imply the exclusion of the presence or addition of one or more other features, quantities, steps, operations, elements, components, or combinations thereof.

[0041] In this disclosure, the term "user" can refer to a person using an electronic device, or a device using an electronic device (e.g., an artificial intelligence electronic device).

[0042] Various embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0043] Figures 1a to 1c These are diagrams used to explain the operation of pixel circuits in order to understand the inventive subject matter of this disclosure.

[0044] Figure 1a An example of a pixel circuit is shown to illustrate the inventive subject matter of this disclosure. Figure 1a In the pixel circuit, the Emi_PWM(n) and Emi_PAM(n) signals can turn on the transistors provided by each signal. The Sweep(n) signal can adjust the pulse width for each grayscale and can be a triangular wave.

[0045] Figure 1b An example of the Emi_PWM(n) signal, the Emi_PAM(n) signal, and the Sweep(n) signal is shown to illustrate the inventive subject matter of this disclosure. (See also...) Figure 1b The Emi_PWM(n) and Emi_PAM(n) signals can be square waves, and the Sweep(n) signal can be a triangular wave.

[0046] Figure 1c These are diagrams used to explain the characteristics of square waves and triangular waves in order to understand the inventive subject matter of this disclosure. (See diagram for example.) Figure 1cAs shown, for fluctuations in the output capability of GIP (e.g., RC delay, coupling, TFT characteristic fluctuations, etc.), triangular waves result in wider waveform rise and fall times compared to square waves. This deviation in GIP output directly affects screen quality, especially since triangular waves have a greater impact on screen quality than square waves.

[0047] Figure 2 This is a block diagram illustrating the configuration of an electronic device 100 according to one embodiment.

[0048] Electronic device 100 may include a driving unit 110, an inorganic light-emitting element 120, and a pixel circuit 130. However, electronic device 100 is not limited to these and may include a driving unit, multiple inorganic light-emitting elements, and multiple pixel circuits. Alternatively, electronic device 100 may also include multiple driving units, multiple inorganic light-emitting elements, and multiple pixel circuits. In other words, electronic device 100 may also include multiple inorganic light-emitting elements arranged in a matrix and operating as sub-pixels, multiple pixel circuits that control the multiple inorganic light-emitting elements, and multiple driving units that control the multiple pixel circuits. Each of the multiple driving units may also control two or more pixel circuits. However, for ease of description, a pixel circuit 130 controlling one inorganic light-emitting element 120 and a driving unit 110 controlling one pixel circuit 130 will be described below.

[0049] The driving unit 110 can drive the pixel circuit 130. For example, the driving unit 110 can provide various types of control signals, data signals, power signals, etc. to the pixel circuit 130 to drive the pixel circuit 130.

[0050] The driving unit 110 may include at least one gate driver circuit (or scan driver circuit) that provides control signals for driving a plurality of inorganic light-emitting elements arranged in a matrix based on row-line units.

[0051] The driving unit 110 may include a source driver circuit (or a data driver circuit) for providing a second control voltage (e.g., PWMData) as described below to a plurality of inorganic light-emitting elements (e.g., sub-pixels) arranged in a matrix.

[0052] The driving unit 110 may also include a MUX circuit for selecting multiple sub-pixels that constitute a pixel.

[0053] The driving unit 110 may include a driving voltage supply circuit for providing a plurality of signals, as described below, to the inorganic light-emitting element.

[0054] The driving unit 110 may include a clock signal providing circuit that provides various types of clock signals for driving the gate driver circuit or the data driver circuit.

[0055] The inorganic light-emitting element 120 can be electrically connected to the pixel circuit 130 and can emit light based on the current supplied from the pixel circuit 130. The inorganic light-emitting element 120 can be mounted on the pixel circuit 130.

[0056] The inorganic light-emitting element 120 can be a sub-pixel of the electronic device 100, and the type of inorganic light-emitting element can be determined based on the color of the emitted light. For example, the inorganic light-emitting element 120 can be a red R inorganic light-emitting element that emits red light, a green G inorganic light-emitting element that emits green light, and a blue B inorganic light-emitting element that emits blue light. However, the inorganic light-emitting element is not limited to these, and can be a white w inorganic light-emitting element that emits white light, and can emit light of various colors. When the inorganic light-emitting element 120 is a white w inorganic light-emitting element, the electronic device 100 may also include an optical conversion layer, a filter, etc., for converting the white light from the inorganic light-emitting element 120 into light of different wavelengths.

[0057] The inorganic light-emitting element 120 can be a light-emitting element using inorganic materials. For example, the inorganic light-emitting element 120 can be a miniature light-emitting diode (micro-LED or μLED) with a size of less than or equal to 100 μm. However, the inorganic light-emitting element is not limited to this, and an organic light-emitting element (organic light-emitting diode (OLED)) using organic materials can be used instead of the inorganic light-emitting element 120.

[0058] The inorganic light-emitting element 120 can represent grayscale values ​​of different brightness based on the magnitude or pulse width of the current supplied from the pixel circuit 130. Here, the pulse width of the current can be referred to as the duty cycle of the current or the driving duration of the current.

[0059] For example, as the magnitude of the current increases, the inorganic light-emitting element 120 can exhibit a brighter grayscale value. Furthermore, as the pulse width of the current increases (in other words, the duty cycle of the current increases or the driving duration of the current increases), the inorganic light-emitting element 120 can exhibit a brighter grayscale value.

[0060] The pixel circuit 130 can control the inorganic light-emitting element 120 based on multiple signals output from the driving unit 110. Each of the multiple signals can be a square wave signal or a DC signal.

[0061] The pixel circuit 130 may include a first circuit 130-1 for controlling the brightness of the inorganic light-emitting element 120, and a second circuit 130-2 for controlling the light-emitting time of the inorganic light-emitting element 120.

[0062] For example, the first circuit 130-1 may include a switching transistor, and supply a first current to the inorganic light-emitting element 120 based on a first control voltage among a plurality of signals via the switching transistor. In other words, the first circuit 130-1 may control the brightness of the inorganic light-emitting element based on the first control voltage. The second circuit 130-2 may include a charging element connected to the gate of the switching transistor, and charge the charging element using a second current based on a second control voltage among a plurality of signals. When the voltage of the charging element reaches a predetermined voltage, the switching transistor may be blocked, and the supply of the first current to the inorganic light-emitting element 120 may be cut off. In other words, the second circuit 130-2 may control the light-emitting time of the inorganic light-emitting element 120 based on the second control voltage.

[0063] The first circuit 130-1 may further include a first driving transistor, and supplies a first initial voltage from among the multiple signals to the gate of the first driving transistor based on a reset signal from among the multiple signals, and supplies a first control voltage to the gate of the first driving transistor based on a data setting signal from among the multiple signals. The second circuit 130-2 may further include a second driving transistor, and supplies a first initial voltage to the gate of the second driving transistor based on a reset signal, and supplies a second control voltage to the gate of the second driving transistor based on a data setting signal. In other words, a first initial voltage can be supplied to the gate of the first driving transistor, and then a first control voltage can be supplied to the gate of the first driving transistor; simultaneously, a first initial voltage can be supplied to the gate of the second driving transistor, and then a second control voltage can be supplied to the gate of the second driving transistor.

[0064] The first circuit 130-1 can supply a first driving voltage from among multiple signals to the source of the first driving transistor based on the light-emitting signal, and provide a first current based on the gate-source voltage of the first driving transistor to the inorganic light-emitting element 120 through a switching transistor. The second circuit 130-2 can supply a second driving voltage from among multiple signals to the source of the second driving transistor based on the light-emitting signal, and can use a second current based on the gate-source voltage of the second driving transistor to charge the charging element. Therefore, the inorganic light-emitting element 120 can emit light with a brightness corresponding to the magnitude of the first current, and the on-time of the switching transistor can be determined based on the magnitude of the second current.

[0065] The first driving voltage can have a predetermined first voltage value, and the second driving voltage can have a predetermined second voltage value. In other words, the gate-source voltage of the first driving transistor can be changed by the first control voltage, and the gate-source voltage of the second driving transistor can be changed by the second control voltage. Therefore, the first current can decrease as the first control voltage increases and increase as the first control voltage decreases, and the second current can decrease as the second control voltage increases and increase as the second control voltage decreases.

[0066] The second circuit 130-2 can supply a second initial voltage to the charging element based on a reset signal, and the second initial voltage can be a voltage that turns on the switching transistor. One end of the inorganic light-emitting element 120 can be grounded, and the other end can be connected to the switching transistor, and is supplied with a first initial voltage based on the reset signal. In other words, the switching transistor can be turned on after a staged signal flow according to the reset signal, and the first current provided from the first circuit 130-1 can be directly provided to the inorganic light-emitting element 120.

[0067] The first circuit 130-1 may further include a first capacitor connected to the gate of the first driving transistor, and the voltage of the gate of the first driving transistor can be maintained by the first capacitor. The second circuit 130-2 may further include a second capacitor connected to the gate of the second driving transistor, and the voltage of the gate of the second driving transistor can be maintained by the second capacitor.

[0068] The charging element may include a third capacitor, and the capacitance of the third capacitor may be greater than the capacitance of each of the first capacitor and the second capacitor.

[0069] The W / L ratio of the first driving transistor can be greater than that of the second driving transistor.

[0070] The specific circuit configuration and operation of the pixel circuit 130 are described with reference to the following figures.

[0071] The following will refer to Figures 3 to 8 To describe the circuit configuration and operation of the electronic device 100 in more detail. For ease of description, Figures 3 to 8 Individual embodiments are described herein. However, Figures 3 to 8 Individual embodiments can also be implemented in a combined state.

[0072] Figure 3 This is a diagram illustrating the circuit configuration of an electronic device 100 according to one embodiment.

[0073] For ease of description, Figure 3 The diagram shows an inorganic light-emitting element 120, a first circuit 130-1, and a second circuit 130-2 (excluding the driving unit 110). Furthermore, Figure 3 The part represented by (n) among the multiple signals refers to the sub-pixel included in the nth row.

[0074] The first circuit 130-1 may include: a first driving transistor TA; a switching transistor T1, the drain of which is connected to the inorganic light-emitting element 120 and the gate of which is connected to the second circuit; a 1-1 transistor connected to the drain and gate of the first driving transistor TA and performing a switching operation based on the SC1(n) signal; a 1-2 transistor connected to the drain of the first driving transistor TA and performing a switching operation based on the reset signal reset(n); a 1-3 transistor connected to the source of the first driving transistor TA and performing a switching operation based on the data setting signal SC2(n); a first capacitor C2, one end of which is connected to the gate of the first driving transistor TA; a 1-4 transistor connected to the source of the first driving transistor TA and the other end of the first capacitor C2 and performing a switching operation based on the light-emitting signal EM(n); and a 1-5 transistor connected to the drain of the first driving transistor TA and the source of the switching transistor T1 and performing a switching operation based on the light-emitting signal EM(n).

[0075] Transistors 1-2 can supply a first initial voltage Initial to the drain of the first driving transistor TA based on the reset signal reset(n). Transistor 1-3 can supply a first control voltage PAM Data to the source of the first driving transistor TA based on the data setting signal SC2(n). Transistor 1-4 can supply a first driving voltage VDD_PAM to the source of the first driving transistor TA based on the light emission signal EM(n). Transistor 1-5 can provide a first current flowing in the first driving transistor TA to the inorganic light-emitting element 120 through the switching transistor T1 based on the light emission signal EM(n).

[0076] The second circuit 130-2 may include: a second driving transistor TW; a 2-1 transistor connected to the drain and gate of the second driving transistor TW and performing a switching operation based on the SC1(n) signal; a 2-2 transistor connected to the drain of the second driving transistor TW and performing a switching operation based on the reset signal reset(n); a 2-3 transistor connected to the source of the second driving transistor TW and performing a switching operation based on the data setting signal SC2(n); a second capacitor C1, one end of which is connected to the gate of the second driving transistor TW; and a 2-4 transistor connected to the second driving transistor TW. The source of transistor TW and the other end of the second capacitor C1 are connected, and the switching operation is performed based on the light emission signal EM(n); transistors 2-5 are connected to the drain of the second driving transistor TW and the gate of the switching transistor T1, and the switching operation is performed based on the light emission signal EM(n); transistors 2-6 are connected to the drain of transistors 2-5 and the gate of the switching transistor T1, and the switching operation is performed based on the reset signal reset(n); and a third capacitor C3 is connected at one end to the drain of transistors 2-5 and the gate of the switching transistor T1, and at the other end to the drain of transistors 2-6. Here, the third capacitor C3 can be used as a charging element.

[0077] Transistor 2-2 can supply the first initial voltage Initial to the drain of the second driving transistor TW based on the reset signal reset(n). Transistor 2-3 can supply the second control voltage PWM Data to the source of the second driving transistor TW based on the data setting signal SC2(n). Transistor 2-4 can supply the second driving voltage VDD_PWM to the source of the second driving transistor TW based on the light emission signal EM(n). Transistor 2-5 can provide a second current flowing in the second driving transistor TW to the third capacitor C3 based on the light emission signal EM(n). Transistor 2-6 can supply the second initial voltage Vset across the third capacitor C3 based on the reset signal reset(n).

[0078] The electronic device 100 may further include circuitry for initializing the node to which the inorganic light-emitting element 120 and the switching transistor T1 are connected. For example, the electronic device 100 may also include a third transistor connected to the node to which the inorganic light-emitting element 120 and the switching transistor T1 are connected, and this third transistor performs a switching operation based on a reset signal reset(n). The third transistor may supply a first initial voltage Initial to the node to which the inorganic light-emitting element 120 and the switching transistor T1 are connected based on the reset signal reset(n).

[0079] The capacitance of the third capacitor C3 can be greater than the capacitance of each of the first capacitor C2 and the second capacitor C1.

[0080] The W / L ratio of the first driving transistor T1 can be greater than that of the second driving transistor.

[0081] The electronic device 100 may also include a fourth transistor that performs a switching operation at the anode terminal of the first driving transistor T1 based on a light-emitting signal EM(n).

[0082] Reference Figures 4 to 7 To describe the operation of pixel circuit 130.

[0083] Figures 4 to 7 This is a diagram showing the operation of an electronic device 100 according to one embodiment.

[0084] like Figure 4 As shown at the top, in section 410-1, the light emission signal EM(n), the SC1(n) signal, the reset signal reset(n), and the data setting signal SC2(n) can all be high values, and... Figure 4 In the pixel circuit 130 shown at the lower end, all transistors can be in the off state. This can also be applied to the 410-2 segment, which is a subsequent segment.

[0085] exist Figure 5 In the upper 510-1 segment, the SC1(n) signal can change from a high value to a low value, and therefore, transistors 1-1 and 2-1 can be turned on.

[0086] exist Figure 5 In the upper 510-2 segment, the reset signal reset(n) can change from a high value to a low value, and therefore, transistors 1-2, 2-2, 2-6 and the third transistor can be turned on.

[0087] like Figure 5As shown at the lower end, when transistors 1-2 are turned on, a first initial voltage Initial (520-1) can be supplied to node 2 through transistors 1-2 and 1-1, and this first initial voltage Initial can be maintained by the first capacitor C2. Furthermore, when transistors 2-2 are turned on, a first initial voltage Initial (520-2) can be supplied to node 1 through transistors 2-2 and 2-1, and this first initial voltage Initial can be maintained by the second capacitor C1. Furthermore, when transistors 2-6 are turned on, a second initial voltage Vset (530) can be supplied to the two ends of the third capacitor C3 through transistors 2-6. Furthermore, when the third transistor is turned on, a first initial voltage Initial (540) can be supplied to node 4, to which the inorganic light-emitting element 120 and the switching transistor T1 are connected. Here, the switching transistor T1 can be turned on based on the second initial voltage Vset.

[0088] exist Figure 6 In the upper 610-1 segment, the reset signal reset(n) can change from a low value to a high value, and transistors 1-2, 2-2, 2-6 and the third transistor can be turned off.

[0089] exist Figure 6 In the upper 610-2 section, the data setting signal SC2(n) can change from a high value to a low value, and therefore, transistors 1-3 and 2-3 can be turned on.

[0090] like Figure 6 As shown at the lower end, when transistors 1-3 are turned on, a first control voltage PAM Data (620-1) can be supplied to node 2 through the first driving transistor TA and transistor 1-1, and this first control voltage PAM Data can be maintained by the first capacitor C2. Furthermore, when transistors 2-3 are turned on, a second control voltage PWM Data (620-2) can be supplied to node 1 through the second driving transistor TW and transistor 2-1, and this second control voltage PWM Data can be maintained by the second capacitor C1.

[0091] exist Figure 7 In the upper 710-1 section, the data setting signal SC2(n) can change from a low value to a high value, and therefore, transistors 1-3 and 2-3 can be turned off.

[0092] exist Figure 7 In the upper 710-2 segment, the SC1(n) signal can change from a low value to a high value, and therefore, transistors 1-1 and 2-1 can be turned off.

[0093] exist Figure 7 In the upper 710-3 segment, the light emission signal EM(n) can change from a high value to a low value, and therefore, transistors 1-4, 1-5, 2-4 and 2-5 can be turned on.

[0094] like Figure 7 As shown at the lower end, when transistors 1-4 and 1-5 are turned on, a first driving voltage VDD_PAM can be supplied to the source of the first driving transistor TA through transistor 1-4, and a first current based on the gate-source voltage of the first driving transistor TA can be provided to the inorganic light-emitting element 120 through transistors 1-5 and switching transistor T1 (720-1). When transistors 2-4 and 2-5 are turned on, a second driving voltage VDD_PWM can be supplied to the source of the second driving transistor TW through transistor 2-4, and a second current based on the gate-source voltage of the second driving transistor TW can be provided to the third capacitor C3 through transistor 2-5 (720-2).

[0095] In other words, the inorganic light-emitting element 120 can emit light with a brightness corresponding to the first current. Furthermore, when the switching transistor T1 is turned off as the voltage of the third capacitor C3 is gradually increased based on the second current, the first current is not supplied to the inorganic light-emitting element 120, thereby stopping the light emission.

[0096] Figure 7 The operation in the 710-4 section at the upper end can be considered as... Figure 7 The operation in the 710-3 section at the upper end is the same (light-emitting state), and it can be repeated when the pixel circuit 130 represents a new pixel value. Figures 4 to 7 The operations within.

[0097] The multiple signals provided by the drive unit 110 can be square wave signals or DC signals. In other words, since the electronic device 100 does not use triangular wave signals, it can prevent reference... Figure 1c The aforementioned issues can be addressed by reducing the sensitivity to fluctuations in GIP's output capabilities, thereby providing higher quality images.

[0098] Figure 8 This is a diagram used to explain the waveform of a grayscale-based node 3 according to one embodiment.

[0099] For reference Figure 7 As mentioned, when the third capacitor C3 is charged using the second current, the gate voltage of the switching transistor T1 can be increased.

[0100] For example, when displaying high grayscale, the driving unit 110 can provide the pixel circuit 130 with a second control signal PWM Data corresponding to high grayscale, and when displaying low grayscale, the driving unit 110 can provide the pixel circuit 130 with a second control signal PWM Data corresponding to low grayscale. Figure 8 The middle figure shows an example of supplying the pixel circuit 130 with a second control signal PWM Data corresponding to the high grayscale, while Figure 8 The diagram at the lower end shows an example of supplying a second control signal PWM Data corresponding to low grayscale to the pixel circuit 130, and the former takes longer to reach a high value than the latter and is able to represent a relatively high grayscale.

[0101] Figure 9 This is a flowchart for explaining a control method of an electronic device according to one embodiment.

[0102] A first current based on a first control voltage from a plurality of signals output from a driving unit of the electronic device is supplied to the inorganic light-emitting element of the electronic device by means of a switching transistor, and a second current based on a second control voltage from a plurality of signals is used to charge a charging element connected to the gate of the switching transistor (S910). Furthermore, when the voltage of the charging element reaches a predetermined voltage, the switching transistor is blocked, thereby cutting off the supply of the first current to the inorganic light-emitting element (S920).

[0103] In addition, the method may further include: supplying a first initial voltage from the plurality of signals to the gate of a first driving transistor included in a first circuit and the gate of a second driving transistor included in a second circuit based on a reset signal from the plurality of signals; and supplying a first control voltage to the gate of the first driving transistor and a second control voltage to the gate of the second driving transistor based on a data setting signal from the plurality of signals.

[0104] Furthermore, charging (S910) may include: supplying a first driving voltage of a plurality of signals to the source of the first driving transistor; supplying a second driving voltage of a plurality of signals to the source of the second driving transistor; providing a first current based on the gate-source voltage of the first driving transistor to the inorganic light-emitting element through a switching transistor based on the light-emitting signal; and charging the charging element using the second current based on the gate-source voltage of the second driving transistor.

[0105] Furthermore, the inorganic light-emitting element can emit light with a brightness corresponding to the magnitude of the first current, and the on-time of the switching transistor can be determined based on the magnitude of the second current.

[0106] Furthermore, the first current can decrease as the first control voltage increases, and increase as the first control voltage decreases; the second current can decrease as the second control voltage increases, and increase as the second control voltage decreases.

[0107] Furthermore, supplying the first initial voltage may include supplying a second initial voltage to the charging element based on a reset signal, and the second initial voltage may be a voltage that turns on the switching transistor.

[0108] Furthermore, one end of the inorganic light-emitting element can be grounded, while the other end is connected to a switching transistor, and a first initial voltage can be supplied to the other end based on a reset signal.

[0109] Furthermore, the voltage of the gate of the first driving transistor can be maintained by a first capacitor connected to the gate of the first driving transistor, and the voltage of the gate of the second driving transistor can be maintained by a second capacitor connected to the gate of the second driving transistor.

[0110] In addition, the charging element may include a third capacitor, and the capacitance of the third capacitor may be greater than the capacitance of each of the first capacitor and the second capacitor.

[0111] Furthermore, the W / L ratio of the first driving transistor can be greater than that of the second driving transistor.

[0112] In addition, each of the multiple signals can be a square wave signal or a DC signal.

[0113] According to the embodiments described herein, since the electronic device does not use triangular wave signals, the sensitivity to fluctuations in the output capability of GIP can be reduced, thereby providing higher quality images.

[0114] Furthermore, the above embodiments can be implemented by software, which includes instructions stored in a storage medium readable by a machine (e.g., a computer). The machine, as a device capable of invoking the stored instructions from the storage medium and operating according to the invoked instructions, can include an electronic device (e.g., electronic device A) according to the disclosed embodiments. Based on the instructions executed by the processor, the processor can directly execute the functions corresponding to the instructions, or can use other elements under the control of the processor to execute these functions. The instructions can include code generated or executed by a compiler or interpreter. The machine-readable storage medium can be provided in the form of a non-transitory storage medium. Here, the term "non-transitory" means only that the storage medium does not include signals and is tangible, and this term does not distinguish between semi-permanent or temporary storage of data in the storage medium.

[0115] According to the embodiments described herein, the method can be provided in the form of a computer program product. This computer program product can be exchanged as a commodity between a seller and a buyer. The computer program product can be distributed in the form of a machine-readable storage medium (e.g., an optical disc read-only memory (CD-ROM)) or distributed online through an app store (e.g., the Play Store™). In the case of online distribution, at least a portion of the computer program product can be temporarily stored in a storage medium, or can be temporarily generated in a storage medium, such as the memory of a manufacturer's server, an app store's server, or a relay server.

[0116] Furthermore, the above embodiments can be implemented via software, hardware, or a combination thereof, on a recording medium readable by a computer or similar computer device. In some cases, the embodiments described herein can be implemented as a processor itself. In the case of software implementation, embodiments such as the steps and functions described herein can be implemented by separate software modules. Each software module can perform one or more of the functions and operations described herein.

[0117] Furthermore, computer instructions for performing processing operations of the apparatus according to the above embodiments can be stored in a non-transitory computer-readable medium. When executed by a processor of a particular device, the computer instructions stored in the non-transitory computer-readable medium cause that device to perform the processing operations of the apparatus according to the above embodiments. A non-transitory computer-readable medium refers to a medium capable of semi-permanently storing data and capable of being read by a machine, rather than a medium that temporarily stores data, such as registers, buffers, and memories. Specific examples of non-transitory computer-readable media may include CDs, DVDs, hard disks, Blu-ray discs, USB drives, memory cards, and ROMs.

[0118] Furthermore, each element (e.g., module or program) according to the above embodiments may consist of a single entity or multiple entities, and some of the corresponding sub-elements may be omitted, or other sub-elements may be included in these embodiments. Alternatively or additionally, some elements (e.g., module or program) may be integrated into one entity to perform the functions performed by each corresponding element before integration in the same or similar manner. Operations performed by modules, programs, or other elements according to the embodiments may be performed sequentially, in parallel, repeatedly, or heuristically, or at least some operations may be performed in a different order, omitted, or included.

[0119] While exemplary embodiments of this disclosure have been described and illustrated above, the embodiments of this disclosure are not limited to the specific embodiments described herein. Moreover, those skilled in the art can certainly make various modifications to it without departing from the inventive subject matter of this disclosure as claimed in the claims, and such modifications should not be construed as departing from the technical spirit or intent of this disclosure.

Claims

1. An electronic device comprising: Drive unit; Inorganic light-emitting elements; as well as The pixel circuit controls the inorganic light-emitting element based on multiple signals output from the driving unit. The pixel circuit includes: A first circuit includes a switching transistor, and provides a first current to the inorganic light-emitting element through the switching transistor based on a first control voltage among the plurality of signals; as well as The second circuit includes a charging element connected to the gate of the switching transistor, charging the charging element with a second current based on a second control voltage among the plurality of signals, and blocking the switching transistor based on the voltage of the charging element reaching a predetermined voltage, thereby cutting off the supply of the first current to the inorganic light-emitting element.

2. The electronic device according to claim 1, in, The first circuit further includes a first driving transistor, which supplies a first initial voltage from the plurality of signals to the gate of the first driving transistor based on a reset signal from the plurality of signals, and supplies a first control voltage to the gate of the first driving transistor based on a data setting signal from the plurality of signals. The second circuit further includes a second driving transistor, which supplies the first initial voltage to the gate of the second driving transistor based on the reset signal, and supplies the second control voltage to the gate of the second driving transistor based on the data setting signal.

3. The electronic device according to claim 2, in, The first circuit supplies a first driving voltage from among the plurality of signals to the source of the first driving transistor based on the light-emitting signal, and provides a first current based on the gate-source voltage of the first driving transistor to the inorganic light-emitting element through the switching transistor. The second circuit supplies a second driving voltage from the plurality of signals to the source of the second driving transistor based on the light-emitting signal, and charges the charging element using a second current based on the gate-source voltage of the second driving transistor.

4. The electronic device according to claim 3, in, The inorganic light-emitting element emits light with a brightness corresponding to the magnitude of the first current, and The on-time of the switching transistor is determined based on the magnitude of the second current.

5. The electronic device according to claim 3, in, The first current decreases as the first control voltage increases, and increases as the first control voltage decreases. The second current decreases as the second control voltage increases, and increases as the second control voltage decreases.

6. The electronic device according to claim 2, in, The second circuit supplies a second initial voltage to the charging element based on the reset signal, and The second initial voltage is the voltage that turns on the switching transistor.

7. The electronic device according to claim 2, in, One end of the inorganic light-emitting element is grounded, while the other end is connected to the switching transistor. The first initial voltage is supplied to the other end based on the reset signal.

8. The electronic device according to claim 2, in, The first circuit further includes a first capacitor connected to the gate of the first driving transistor, and the gate voltage of the first driving transistor is maintained by the first capacitor. The second circuit further includes a second capacitor connected to the gate of the second driving transistor, and the gate voltage of the second driving transistor is maintained by the second capacitor.

9. The electronic device according to claim 8, in, The charging element includes a third capacitor, and The capacitance of the third capacitor is greater than the capacitance of each of the first and second capacitors.

10. The electronic device according to claim 2, in, The W / L ratio of the first driving transistor is greater than that of the second driving transistor.

11. The electronic device according to claim 1, in, Each of the plurality of signals is a square wave signal or a DC signal.

12. A method for controlling an electronic device, the method comprising: A first current based on a first control voltage among a plurality of signals output from the driving unit of the electronic device is provided to the inorganic light-emitting element of the electronic device by means of a switching transistor, and a second current based on a second control voltage among the plurality of signals is used to charge a charging element connected to the gate of the switching transistor. as well as The switching transistor is blocked when the voltage of the charging element reaches a predetermined voltage, thereby cutting off the supply of the first current to the inorganic light-emitting element.

13. The method of claim 12, further comprising: Based on the reset signal among the plurality of signals, a first initial voltage among the plurality of signals is supplied to the gate of the first driving transistor included in the first circuit and the gate of the second driving transistor included in the second circuit; as well as Based on the data setting signal among the plurality of signals, the first control voltage is supplied to the gate of the first driving transistor, and the second control voltage is supplied to the gate of the second driving transistor.

14. The method according to claim 13, The charging includes: Based on the light-emitting signal, a first driving voltage among the plurality of signals is supplied to the source of the first driving transistor, and a second driving voltage among the plurality of signals is supplied to the source of the second driving transistor; as well as The switching transistor provides the inorganic light-emitting element with a first current based on the gate-source voltage of the first driving transistor, and the charging element is charged using a second current based on the gate-source voltage of the second driving transistor.

15. The method according to claim 14, in, The inorganic light-emitting element emits light with a brightness corresponding to the magnitude of the first current, and The on-time of the switching transistor is determined based on the magnitude of the second current.

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