Micro light emitting diode display device and driving method thereof

Abstract

The present invention discloses a micro-light emitting diode display device and a driving method thereof. The display device includes a display substrate and a data driving circuit. The display substrate includes a plurality of pixels, each pixel including a first sub-pixel and a second sub-pixel. The first sub-pixel has a first sub-pixel circuit and a first light-emitting element electrically connected to the first sub-pixel circuit, and the second sub-pixel has a second sub-pixel circuit and a second light-emitting element electrically connected to the second sub-pixel circuit. The first sub-pixel circuit and the second sub-pixel circuit are configured independently of each other. The data driving circuit is electrically connected to the first sub-pixel circuits and the second sub-pixel circuits; wherein the data driving circuit transmits a first data signal to each first sub-pixel circuit to drive each first light-emitting element, and transmits a second data signal to each second sub-pixel circuit to drive each second light-emitting element. The first data signal is a PWM signal, and the second data signal is a PAM signal.

Description

Technical Field

[0001] The present invention relates to a display device and a driving method thereof, and more particularly to a micro light emitting diode display device and a driving method thereof. Background Art

[0002] Existing micro-LED display devices include multiple pixels with identical circuitry. Pulse-width modulation (PWM) technology is typically used to control the light emission of the micro-LEDs in all pixels. However, PWM control suffers from the high current characteristics of the circuits when the panel is turned on, resulting in a short charging time and an IR drop when displaying high resolutions. Alternatively, pulse-amplitude modulation (PAM) technology is used to control the light emission of the micro-LEDs in all pixels. However, the wavelength of the micro-LEDs shifts under different current densities, causing severe color shift in the displayed image. Summary of the Invention

[0003] An object of the present invention is to provide a micro light emitting diode display device having independently configured sub-pixel circuits and a driving method thereof.

[0004] To achieve the above objectives, a micro-LED display device according to the present invention includes a display substrate and a data driver circuit. The display substrate includes a plurality of pixels, each pixel including a first sub-pixel and a second sub-pixel. The first sub-pixel has a first sub-pixel circuit and a first light-emitting element electrically connected to the first sub-pixel circuit, and the second sub-pixel has a second sub-pixel circuit and a second light-emitting element electrically connected to the second sub-pixel circuit. The first sub-pixel circuit and the second sub-pixel circuit are configured independently of each other. The data driver circuit is electrically connected to the first sub-pixel circuit and the second sub-pixel circuit via a plurality of data lines. The data driver circuit transmits a first data signal to each first sub-pixel circuit to drive each first light-emitting element, and transmits a second data signal to each second sub-pixel circuit to drive each second light-emitting element. The first data signal is a pulse-width modulation (PWM) signal, and the second data signal is a pulse-amplitude modulation (PAM) signal.

[0005] To achieve the above objectives, a driving method for a micro-LED display device is disclosed herein. The micro-LED display device includes a display substrate and a data driving circuit. The display substrate includes a plurality of pixels, each pixel including a first sub-pixel and a second sub-pixel. The first sub-pixel has a first sub-pixel circuit and a first light-emitting element electrically connected to the first sub-pixel circuit, and the second sub-pixel has a second sub-pixel circuit and a second light-emitting element electrically connected to the second sub-pixel circuit. The first sub-pixel circuit and the second sub-pixel circuit are independently configured. The data driving circuit is electrically connected to the first sub-pixel circuit and the second sub-pixel circuit via a plurality of data lines. The driving method includes at least the following steps: transmitting a first data signal from the data driving circuit to each first sub-pixel circuit to drive each first light-emitting element; and transmitting a second data signal from the data driving circuit to each second sub-pixel circuit to drive each second light-emitting element. The first data signal is a pulse width modulation (PWM) signal, and the second data signal is a pulse amplitude modulation (PAM) signal.

[0006] As described above, in the micro-LED display device and its driving method of the present invention, each pixel includes two independently configured first sub-pixel circuits and second sub-pixel circuits. The data driving circuit can transmit a first data signal (PWM signal) to each first sub-pixel circuit to drive each first light-emitting element to emit light, and the data driving circuit can also transmit a second data signal (PAM signal) to each second sub-pixel circuit to drive each second light-emitting element to emit light. Thus, compared to conventional micro-LED display devices in which all pixels (sub-pixels) have identical circuits and use PWM technology or PAM technology to control the light-emitting elements of all pixels, the micro-LED display device and its driving method of the present invention are different from conventional display devices and their driving methods. By using two independently configured sub-pixel circuits, the device can solve the color shift problem caused by PAM technology while supporting high-resolution display. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1A FIG. 4 is a schematic diagram of a micro light emitting diode display device according to an embodiment of the present invention.

[0008] Figure 1B FIG. 4 is a schematic diagram of a micro light emitting diode display device according to another embodiment of the present invention.

[0009] Figure 2A and Figure 2B They are Figure 1A or Figure 1B Schematic diagram of a first sub-pixel circuit and a second sub-pixel circuit of each pixel in a micro light emitting diode display device.

[0010] Figure 3 for Figure 1A or Figure 1B Schematic diagram of driving waveform of a micro light emitting diode display device.

[0011] Figure 4A and Figure 4B Schematic diagrams of a first sub-pixel circuit and a second sub-pixel circuit according to another embodiment of the present invention.

[0012] Figure 4C FIG. 4 is a schematic diagram of a first sub-pixel circuit according to another embodiment of the present invention.

[0013] Figure 4D FIG. 1 is a schematic diagram showing the connection between pixels, scan lines, and data lines according to an embodiment of the present invention.

[0014] Figure 4E for Figure 4D Schematic diagram of the signal waveform.

[0015] Figure 5 Schematic diagrams of micro light emitting diode display devices according to different embodiments of the present invention. DETAILED DESCRIPTION

[0016] A micro-LED display device and a driving method thereof according to embodiments of the present invention will be described below with reference to the relevant drawings, wherein the same elements will be described with the same reference symbols.

[0017] Figure 1A and Figure 1B are schematic diagrams of micro light emitting diode display devices according to different embodiments of the present invention, Figure 2A and Figure 2B They are Figure 1A or Figure 1B A schematic diagram of a first sub-pixel circuit and a second sub-pixel circuit of each pixel in a micro light emitting diode display device is shown. Figure 3 for Figure 1A or Figure 1B Schematic diagram of driving waveform of a micro light emitting diode display device.

[0018] Please refer to Figure 1A 、 Figure 2A and Figure 2B The micro LED display device 1 is an active matrix micro LED display device, which may include a display substrate 11 and a data driving circuit. The data driving circuit of this embodiment may include a first data driving circuit 12a and a second data driving circuit 12b.

[0019] The display substrate 11 includes a plurality of pixels P, which are arranged in a matrix consisting of rows and columns. Each pixel P includes at least a first sub-pixel P1 and a second sub-pixel P2. The first sub-pixel P1 has a first sub-pixel circuit PC1 and a first light-emitting element L1 ( Figure 2A ), the second sub-pixel P2 includes a second sub-pixel circuit PC2 and a second light-emitting element L2 electrically connected to the second sub-pixel circuit PC2 ( Figure 2B ), wherein the first sub-pixel circuit PC1 and the second sub-pixel circuit PC2 are configured independently of each other. Specifically, the first sub-pixel circuit PC1 and the second sub-pixel circuit PC2 are independent (not integrated) circuits and are different from each other, and the first light-emitting element L1 can be a micro-LED that emits red light, and the second light-emitting element L2 can be a micro-LED that emits green light or blue light. Each pixel P of this embodiment includes one first sub-pixel P1 and two second sub-pixels P2, and the first sub-pixel circuit PC1 can drive the corresponding first light-emitting element L1 to emit red light (i.e., the first light-emitting element L1 is a micro-LED that can emit red light), one of the second sub-pixel circuits PC2 can drive the corresponding second light-emitting element L2 to emit green light (i.e., the second light-emitting element L2 is a micro-LED that can emit green light), and the other second sub-pixel circuit PC2 can drive the corresponding second light-emitting element L2 to emit blue light (i.e., the second light-emitting element L2 is a micro-LED that can emit blue light).

[0020] The data driving circuit can be electrically connected to the first sub-pixel circuits and the second sub-pixel circuits via a plurality of data lines; wherein the data driving circuit can transmit a first data signal to each first sub-pixel circuit to drive each first light-emitting element, and transmit a second data signal to each second sub-pixel circuit to drive each second light-emitting element; the first data signal is a pulse width modulation (PWM) signal, and the second data signal is a pulse amplitude modulation (PAM) signal. In this embodiment, the data lines include a plurality of first data lines DL1 and a plurality of second data lines DL2, the first data driving circuit 12a can be electrically connected to the first sub-pixel circuits PC1 via the plurality of first data lines DL1, and the second data driving circuit 12b can be electrically connected to the second sub-pixel circuits PC2 via the plurality of second data lines DL2. In this way, the first data driving circuit 12a can transmit the first data signal D respectively through each first data line DL1. P1 To each first sub-pixel circuit PC1 to drive each first light emitting element L1 to emit light, and the second data driving circuit 12b can transmit the second data signal D through each second data line DL2. P2 To each second sub-pixel circuit PC2 to drive each second light emitting element L2 to emit light. P1is a pulse width modulation (PWM) signal, and the second data signal D P2 The first data driving circuit 12a is a data driver that can generate a PWM signal, and the second data driving circuit 12b is a data driver that can generate a PAM signal. This design can achieve better driving efficiency.

[0021] In different embodiments, Figure 1B As shown, there is only one data driving circuit 12. The data driving circuit 12 can be electrically connected to the first sub-pixel circuits PC1 through a plurality of first data lines DL1, and can be electrically connected to the second sub-pixel circuits PC2 through a plurality of second data lines DL2. In this way, the data driving circuit 12 can transmit the first data signal D through each first data line DL1. P1 To each first sub-pixel circuit PC1 to drive each first light emitting element L1 to emit light, and the data driving circuit 12 can transmit the second data signal D through each second data line DL2. P2 To each second sub-pixel circuit PC2 to drive each second light-emitting element L2 to emit light.

[0022] In addition, please refer to Figure 1A The micro LED display device 1 of this embodiment may further include a scan driver circuit 13. The scan driver circuit 13 may be electrically connected to the first sub-pixel circuits PC1 and the second sub-pixel circuits PC2 via a plurality of scan lines S1-Sm. The scan driver circuit 13 may sequentially output scan signals via the scan lines S1-Sm and transmit them to the first sub-pixel circuits PC1 and the second sub-pixel circuits PC2 of each column of pixels P, thereby driving the first light-emitting elements L1 and the second light-emitting elements L2 of each column of pixels P to emit light.

[0023] Therefore, in the micro LED display device 1 of this embodiment, when the scan driving circuit 13 sequentially outputs the scan signals to turn on the scan lines S1 to Sm in order, the first data driving circuit 12a can output the first data signal D corresponding to each column of pixels P. P1 The PWM signal is transmitted to the first sub-pixel circuits PC1 of the pixels P through the first data lines DL1, and the second data driving circuit 12b can generate the second data signal D corresponding to each column of pixels P. P2 The (PAM signal) is transmitted to the second sub-pixel circuits PC2 of the pixels P through the second data lines DL2, thereby driving or lighting up the first light-emitting element L1 and the second light-emitting element L2 of the pixels P, thereby enabling the display device to display an image. The first sub-pixel circuit PC1 can be controlled according to the PWM data voltage (the first data signal D P1) controls the driving time of the driving current provided to the first light emitting element L1, and the second sub-pixel circuit PC2 can be based on the PAM data voltage (the second data signal D P2 ) controls the amplitude of the driving current provided to the second light emitting element L2. Here, the first light emitting element L1 is a red micro light emitting diode, and the PWM data voltage (the first data signal D P1 ) allows the red micro-LED, which has a poor efficiency at low current density, to have better efficiency under PWM control, while the second light emitting element L2 is a green or blue micro-LED, and the PAM data voltage (the second data signal D P2 ) allows micro-LEDs that are less affected by wavelength shift at different current densities to achieve high-resolution display requirements using PAM control.

[0024] Continue, in Figure 1A In the micro light emitting diode display device 1, each pixel P includes a first sub-pixel P1 and a second sub-pixel P2. The first sub-pixel P1 and the second sub-pixel P2 respectively have a first sub-pixel circuit PC1 and a second sub-pixel circuit PC2 that are independently configured from each other. The first data driving circuit 12a can respectively transmit the first data signal D P1 (PWM signal) to each first sub-pixel circuit PC1 to drive each first light-emitting element L1 to emit light, and the second data driving circuit 12b can respectively transmit the second data signal D P2 (PAM signal) is sent to each second sub-pixel circuit PC2 to drive each second light-emitting element L2 to emit light. Compared with the existing micro-LED display device in which the circuits of all pixels (sub-pixels) are the same and the PWM technology is used to control the light-emitting elements of all pixels to emit light, or the PAM technology is used to control the light-emitting elements of all pixels to emit light, the micro-LED display device 1 of this embodiment uses both PWM and PAM technologies to control different sub-pixel circuits of each pixel. Therefore, it is a new type of micro-LED display device different from the existing practice. By using two independently configured sub-pixel circuits, it can solve the color shift problem controlled by PAM technology and support high-resolution display.

[0025] Please refer to Figure 2A 、 Figure 2B and Figure 3 , in order to explain in detail the first sub-pixel circuit PC1 and the second sub-pixel circuit PC2 of each pixel P and their driving. First, it is explained that Figures 2A to 4EComponent symbols S1-Sm, Si, SL1, and SL2 appearing in the embodiments may represent scan lines or scan signals, depending on the context of use. Furthermore, i may be between 1 and m (1≤i≤m), and m and n are positive integers (m is the number of scan lines, and n is the number of data lines). Furthermore, the "control terminal" of a transistor herein may be the gate of the transistor, the "first terminal" may be the first source / drain of the transistor, and the "second terminal" may be the second source / drain of the transistor.

[0026] Figure 2A The first sub-pixel circuit PC1 of the embodiment is, for example, a 2T circuit structure, but is not limited thereto. In different embodiments, the first sub-pixel circuit PC1 may also be other circuit structures, such as a 1T circuit structure having only one switching transistor, or other circuit structures, without limitation. Figure 2B The second sub-pixel circuit PC2 of the embodiment is, for example, a 2T1C circuit structure, but is not limited thereto. In different embodiments, the first sub-pixel circuit PC1 may also be other circuit structures.

[0027] like Figure 2A As shown, the first sub-pixel circuit PC1 of this embodiment comprises a switch transistor T1 and a drive transistor T2. The switch transistor T1 can be controlled by a scan signal to be turned on to receive the first data signal D P1 The control end of the switch transistor T1 is connected to a scan line Si to receive a scan signal, and the first end of the switch transistor T1 is connected to the first data line DL1 to receive the first data signal D. P1 The second end of the switch transistor T1 is connected to the control end of the driving transistor T2, and the first end of the driving transistor T2 is connected to the first voltage V DD The second end of the driving transistor T2 is connected to one end of the first light emitting element L1, and the other end of the first light emitting element L1 is electrically connected to the second voltage V EE In this way, the driving transistor T2 can be driven according to the first data signal D transmitted by the switching transistor T1. P1 The first light emitting element L1 is driven to emit light. In particular, because the first data signal D P1 Because the signal is a PWM signal, the first sub-pixel circuit PC1 does not have a capacitor for maintaining a potential or stabilizing a voltage. Furthermore, the switching transistor T1 and the driving transistor T2 in this embodiment are P-type transistors, such as, but not limited to, P-type MOSFETs (metal oxide semiconductor field effect transistors). Those skilled in the art will appreciate that the transistors may be N-type transistors in addition to P-type transistors.

[0028] like Figure 2BAs shown, the second sub-pixel circuit PC2 has a switch transistor T1 and a drive transistor T2. P2 The second sub-pixel circuit PC2 further includes a capacitor C for maintaining the potential of the second light emitting element L2. One end of the capacitor C is connected to the second end of the switching transistor T1 and the control end of the driving transistor T2, and the other end of the capacitor C is connected to the first voltage V DD and a first terminal of the driving transistor T2.

[0029] like Figure 3 As shown, in one frame period FT, the scan driving circuit 13 can output at least two scan signals to drive the first sub-pixel circuits PC1, so that the first data driving circuit 12a provides the corresponding first data signal D P1 (PWM signal) is provided to the first sub-pixel circuits PC1, thereby controlling the first light-emitting elements L1 to emit light. Specifically, because the efficiency of the red micro-LED (first light-emitting element L1) is very low at low current density, the scan driving circuit 13 of this embodiment can provide two scan signals in one frame period FT to turn on the switch transistor T1 driving the first sub-pixel circuit PC1 twice, so that the first data driving circuit 12a can provide two first data signals D correspondingly. P1 The first sub-pixel circuit PC1 is provided with a higher current density, so that the first light-emitting element L1 (red micro-LED) can have a higher current density, thereby achieving high-efficiency operation, thereby achieving the purpose of saving power and making the display device have a higher brightness. In some embodiments, the scan driving circuit 13 can also output more than two scan signals (for example, three times or four times) to drive the first sub-pixel circuit PC1, so that the first data driving circuit 12a can provide more than two first data signals D P1 (PWM signal) is given to the first sub-pixel circuits PC1, which is not limited in the present invention.

[0030] In addition, since the second sub-pixel circuit PC2 has a capacitor C for maintaining the driving current of the second light emitting element L2, the second data driving circuit 12b only needs to provide the second data signal D once during the frame period FT. P2 (PAM signal) to each second sub-pixel circuit PC2, so as to light up each second light-emitting element L2 (green and blue micro-LEDs). In this embodiment, before the scan driving circuit 13 outputs the second scan signal to drive the first sub-pixel circuit PC1 (i.e., before the first data driving circuit 12a transmits the first data signal D for the second time), P1 Before each first sub-pixel circuit PC1 is reached, the second data driving circuit 12b has transmitted the second data signal D P2Therefore, after the scan driving circuit 13 outputs the first scan signal to drive the first sub-pixel circuits PC1, the second data lines DL2 connected to the second sub-pixel circuits PC2 can be left idle, thereby saving power.

[0031] In addition, by Figure 3 It can also be seen that the first data signal D P1 The frequency of the second data signal D P2 For example, if the frequency is at least 60 Hz, the first data signal D provided to the first sub-pixel circuit PC1 is P1 The frequency can be equal to or greater than 120Hz, or greater than twice, so the human eye will not feel that the picture is flickering.

[0032] It is worth mentioning that, in different embodiments, each pixel P may also include two first sub-pixel circuits PC1 and one second sub-pixel circuit PC2, wherein one first sub-pixel circuit PC1 can drive the corresponding first light-emitting element L1 to emit red light (i.e., one of the first light-emitting elements L1 is a micro-light-emitting diode that can emit red light), the other first sub-pixel circuit PC1 can drive the corresponding first light-emitting element L1 to emit green light (i.e., the other first light-emitting element L1 is a micro-light-emitting diode that can emit green light), and the second sub-pixel circuit PC2 can drive the corresponding second light-emitting element L2 to emit blue light (i.e., the second light-emitting element L2 is a micro-light-emitting diode that can emit blue light). In this way, the first data driving circuit 12a can provide two first data signals D respectively. P1 The two first sub-pixel circuits PC1 allow the red micro LED (one of the first light emitting elements L1 ) to have a higher current density, thereby saving power and improving the color shift of the green micro LED (the other first light emitting element L1 ).

[0033] Please refer to Figures 4A to 4E ,in, Figure 4A and Figure 4B are schematic diagrams of a first sub-pixel circuit and a second sub-pixel circuit according to another embodiment of the present invention, Figure 4C is a schematic diagram of a first sub-pixel circuit according to another embodiment of the present invention. Figure 4D FIG. 1 is a schematic diagram showing connections between pixels, scan lines, and data lines according to an embodiment of the present invention. Figure 4E for Figure 4D Schematic diagram of the signal waveform.

[0034] Please refer to Figure 4A and Figure 4B As shown, the first sub-pixel circuit and the second sub-pixel circuit of this embodiment are Figure 2A and Figure 2BThe component composition and connection relationship of each component are substantially the same. The difference is that the scan lines of this embodiment may include multiple first scan lines SL1 and multiple second scan lines SL2, and the first scan lines SL1 and the second scan lines SL2 are arranged alternately. The first scan lines SL1 are respectively connected to the first sub-pixel circuits PC1 in the same column, and the second scan lines SL2 are respectively connected to the second sub-pixel circuits PC2 in the same column.

[0035] In various embodiments, Figure 4C As shown, the first sub-pixel circuit PC1 may not have a driving transistor T2, but directly controls the light emission of the first light emitting element L1 with a switch transistor T1. Here, when the signal of the first scan line SL1 turns on the switch transistor T1, the first voltage V DD and the first data signal D P1 (PWM signal) can be provided to the first light emitting element L1 via the switching transistor T1 to control the light emission of the first light emitting element L1, thereby reducing the first voltage V DD Or the first data signal D P1 of pressure drop.

[0036] In addition, if Figure 4D As shown, Figure 4D The micro-light-emitting elements (L1 and L2) are not shown. The first sub-pixel circuit PC1 of each pixel P in the same column is connected to the same first scan line SL1, and the two second sub-pixel circuits PC2 of each pixel P in the same column are connected to the same second scan line SL2. Two adjacent first scan lines SL1 and second scan lines SL2 connect the first sub-pixel circuit PC1 and the two second sub-pixel circuits PC2 of the pixels P in the same column.

[0037] Therefore, if Figure 4E As shown, the scan driver circuit 13 can simultaneously drive the first sub-pixel circuit PC1 and two second sub-pixel circuits PC2 in the same column via the first scan line SL1 and the second scan line SL2 connected to the pixels P in the same column. Because the scan lines connected to the first sub-pixel circuit PC1 and the second sub-pixel circuit PC2 of the same pixel P are independent of each other, when the first scan line SL1 outputs a scan signal to the first sub-pixel circuit PC1 for the second time, the second data line DL2 connected to the second sub-pixel circuit PC2 does not need to be idle, thereby simplifying the control of the second data driver circuit 12b.

[0038] In addition, please refer to Figure 5, which are schematic diagrams of micro-LED display devices according to different embodiments of the present invention. The component composition and connection relationship of the micro-LED display device 1a of this embodiment are substantially the same as those of the micro-LED display device 1 of the aforementioned embodiment. The difference is that the micro-LED display device 1a of this embodiment further includes multiple first integrated circuits IC1 and a second integrated circuit IC2. These first integrated circuits IC1 are disposed in the display area A1 of the display substrate 11a and include a first data driver circuit. Furthermore, the second integrated circuit IC2 is disposed in the non-display area A2 of the display substrate 11 and includes a second data driver circuit 12b. Here, each first integrated circuit IC1 is electrically connected to the first sub-pixel circuit PC1 of at least one pixel P, while the second integrated circuit IC2 is electrically connected to the second sub-pixel circuits PC2 of these pixels P.

[0039] Specifically, the first data driving circuit can be divided and manufactured into a plurality of corresponding first integrated circuits IC1 (e.g., micro integrated circuits, Micro ICs) according to the position of the first sub-pixel circuit PC1 in the display area A1, and these first integrated circuits IC1 are respectively arranged at the corresponding positions of the display area A1 using, for example, COB (Chip On Board) technology to respectively provide the first data signal D P1 To the corresponding first sub-pixel circuit PC1. In addition, the second data driving circuit can be made into a second integrated circuit IC2 and disposed in the non-display area A2 to provide the second data signal D P2 To the second sub-pixel circuits PC2.

[0040] In this embodiment, each first integrated circuit IC1 is electrically connected to four first sub-pixel circuits PC1 of four adjacent pixels P to provide first data signals D respectively. P1 to four corresponding first sub-pixel circuits PC1, and the second integrated circuit IC2 is electrically connected to the second sub-pixel circuits PC2 of the pixels P via the second data lines DL2 to provide the second data signals D P2 To the corresponding second sub-pixel circuit PC2.

[0041] The present invention also provides a driving method for a micro-LED display device, which may include at least the following steps: transmitting a first data signal from the data driving circuit to each first sub-pixel circuit to drive each first light-emitting element; and transmitting a second data signal from the data driving circuit to each second sub-pixel circuit to drive each second light-emitting element; wherein the first data signal is a pulse-width modulated (PWM) signal, and the second data signal is a pulse-amplitude modulated (PAM) signal. In some embodiments, the frequency of the first data signal is twice that of the second data signal. In some embodiments, the data driving circuit includes a first data driving circuit and a second data driving circuit, wherein the first data driving circuit transmits the first data signal to each first sub-pixel circuit to drive each first light-emitting element, and the second data driving circuit transmits the second data signal to each second sub-pixel circuit to drive each second light-emitting element.

[0042] In some embodiments, the driving method may further include: during a frame period, the scan driving circuit outputs at least two scan signals to drive the first sub-pixel circuits, so that the data driving circuit provides the corresponding first data signal to the first sub-pixel circuits to control the light emission of the first light-emitting elements; in some embodiments, during the frame period, the data driving circuit only provides the second data signal to each of the second sub-pixel circuits once; before the scan driving circuit outputs the second scan signal to drive the first sub-pixel circuits, the data driving circuit has transmitted the second data signal to each of the second sub-pixel circuits; after the scan driving circuit outputs the first scan signal to drive the first sub-pixel circuits, the data lines connected to the second sub-pixel circuits are left unconnected; in some embodiments, the scan driving circuit simultaneously drives the first sub-pixel circuits and the second sub-pixel circuits in the same column via the first scan line and the second scan line connected to each of the pixels in the same column.

[0043] In addition, other technical features of the driving method of the micro-LED display device of the present invention can be referred to the above description and will not be repeated here.

[0044] In summary, in the micro-LED display device and its driving method of the present invention, each pixel includes two independently configured first sub-pixel circuits and second sub-pixel circuits. The data driving circuit can transmit a first data signal (PWM signal) to each first sub-pixel circuit to drive each first light-emitting element to emit light, and the data driving circuit can also transmit a second data signal (PAM signal) to each second sub-pixel circuit to drive each second light-emitting element to emit light. Thus, compared to conventional micro-LED display devices in which all pixels (sub-pixels) have identical circuits and the light-emitting elements of all pixels are controlled by PWM technology, or PAM technology is used to control the light-emitting elements of all pixels, the micro-LED display device and its driving method of the present invention are different from conventional display devices and their driving methods. By using two independently configured sub-pixel circuits, the color shift problem caused by PAM technology can be solved while supporting high-resolution display. Furthermore, in some embodiments, the present invention can achieve high-efficiency operation, thereby achieving power conservation.

[0045] The above description is for illustrative purposes only and is not intended to be limiting. Any equivalent modifications or variations that do not depart from the spirit and scope of the present invention should be included in the scope of the appended patent applications.

Claims

1. A micro light emitting diode display device comprising: The display substrate includes a plurality of pixels, each of which includes: A first sub-pixel having a first sub-pixel circuit and a first light-emitting element electrically connected to the first sub-pixel circuit; and A second sub-pixel comprises a second sub-pixel circuit and a second light-emitting element electrically connected to the second sub-pixel circuit; the first sub-pixel circuit and the second sub-pixel circuit are configured independently of each other; and a data driving circuit electrically connected to the first sub-pixel circuits and the second sub-pixel circuits via a plurality of data lines; and a scan driving circuit electrically connected to the first sub-pixel circuits and the second sub-pixel circuits via a plurality of scan lines; The data driving circuit transmits a first data signal to each of the first sub-pixel circuits to drive each of the first light-emitting elements, and transmits a second data signal to each of the second sub-pixel circuits to drive each of the second light-emitting elements, wherein the first data signal is a pulse width modulation signal, and the second data signal is a pulse amplitude modulation signal; The first light-emitting element is a micro-LED that emits red light, and the second light-emitting element is a micro-LED that emits blue light. During a frame period, the scan driving circuit outputs at least two scan signals to drive the first sub-pixel circuits, so that the data driving circuit provides the corresponding first data signals to the first sub-pixel circuits to control the first light-emitting elements to emit light.

2. The micro light emitting diode display device according to claim 1, wherein: Each of the first sub-pixel circuits has a switch transistor, and each of the second sub-pixel circuits has a switch transistor and a capacitor for maintaining the potential of the second light-emitting element.

3. The micro light emitting diode display device according to claim 1, wherein: Each of the first sub-pixel circuits has a switching transistor and a driving transistor, the control end of the switching transistor is connected to the scan line to receive the scan signal, the first end of the switching transistor is connected to one of the data lines to receive the first data signal, the second end of the switching transistor is connected to the control end of the driving transistor, the first end of the driving transistor is connected to a first voltage, the second end of the driving transistor is connected to one end of the corresponding first light-emitting element, and the other end of the first light-emitting element is electrically connected to a second voltage.

4. The micro light emitting diode display device according to claim 1, wherein: Each second sub-pixel circuit has a switching transistor, a driving transistor and a capacitor, the control end of the switching transistor is connected to the scan line to receive the scan signal, the first end of the switching transistor is connected to one of the data lines to receive the second data signal, the second end of the switching transistor is connected to the control end of the driving transistor, the first end of the driving transistor is connected to a first voltage, the second end of the driving transistor is connected to one end of the corresponding second light-emitting element, the other end of the second light-emitting element is electrically connected to the second voltage, one end of the capacitor is connected to the second end of the switching transistor and the control end of the driving transistor, and the other end of the capacitor is connected to the first voltage and the first end of the driving transistor.

5. The micro light emitting diode display device according to claim 1, wherein: During the frame period, the data driving circuit provides the second data signal to each second sub-pixel circuit only once.

6. The micro light emitting diode display device according to claim 1, wherein: Before the scan driving circuit outputs the second scan signal to drive the first sub-pixel circuits, the data driving circuit has already transmitted the second data signal to each of the second sub-pixel circuits.

7. The micro light emitting diode display device according to claim 6, wherein: After the scan driving circuit outputs the scan signal for the first time to drive the first sub-pixel circuits, the data lines connected to the second sub-pixel circuits are left unconnected.

8. The micro light emitting diode display device according to claim 1, wherein: The scan lines include a plurality of first scan lines and a plurality of second scan lines, and the first scan lines and the second scan lines are arranged alternately; the first scan lines are respectively connected to the first sub-pixel circuits in the same column, and the second scan lines are respectively connected to the second sub-pixel circuits in the same column.

9. The micro light emitting diode display device according to claim 8, wherein: The scan driving circuit simultaneously drives the first sub-pixel circuit and the second sub-pixel circuit in the same column via the first scan line and the second scan line connected to the pixels in the same column.

10. The micro light emitting diode display device according to claim 1, wherein: The frequency of the first data signal is twice or more than twice that of the second data signal.

11. The micro light emitting diode display device according to claim 1, wherein: The data lines include a plurality of first data lines and a plurality of second data lines, and the data driving circuit includes: a first data driving circuit electrically connected to the first sub-pixel circuits via the first data lines; and a second data driving circuit electrically connected to the second sub-pixel circuits via the second data lines; The first data driving circuit transmits the first data signal to each of the first sub-pixel circuits to drive each of the first light-emitting elements, and the second data driving circuit transmits the second data signal to each of the second sub-pixel circuits to drive each of the second light-emitting elements.

12. The micro light emitting diode display device according to claim 11, wherein: Also includes: A plurality of first integrated circuits are disposed in the display area of the display substrate, wherein the first integrated circuits include the first data driving circuit; and a second integrated circuit disposed in the non-display area of the display substrate, the second integrated circuit including the second data driving circuit; Each of the first integrated circuits is electrically connected to the first sub-pixel circuit of at least one of the pixels, and the second integrated circuit is electrically connected to the second sub-pixel circuits of the pixels.

13. A driving method for a micro light emitting diode display device, wherein: The micro-LED display device includes a display substrate, a data driving circuit, and a scan driving circuit. The display substrate includes a plurality of pixels, each of which includes a first sub-pixel and a second sub-pixel. The first sub-pixel has a first sub-pixel circuit and a first light-emitting element electrically connected to the first sub-pixel circuit, and the second sub-pixel has a second sub-pixel circuit and a second light-emitting element electrically connected to the second sub-pixel circuit. The first sub-pixel circuit and the second sub-pixel circuit are independently configured. The data driving circuit is electrically connected to the first sub-pixel circuit and the second sub-pixel circuit via a plurality of data lines. The scan driving circuit is electrically connected to the first sub-pixel circuit and the second sub-pixel circuit via a plurality of scan lines. The driving method includes at least the following steps: The data driving circuit transmits a first data signal to each of the first sub-pixel circuits to drive each of the first light-emitting elements; and The data driving circuit transmits a second data signal to each of the second sub-pixel circuits to drive each of the second light-emitting elements; Wherein, the first data signal is a pulse width modulation signal, and the second data signal is a pulse amplitude modulation signal; The first light-emitting element is a micro-LED that emits red light, and the second light-emitting element is a micro-LED that emits blue light. During one frame, the scan driving circuit outputs at least two scan signals to drive the first sub-pixel circuits, so that the data driving circuit provides the corresponding first data signals to the first sub-pixel circuits to control the first light-emitting elements to emit light.

14. The driving method according to claim 13, wherein: During the frame period, the data driving circuit provides the second data signal to each second sub-pixel circuit only once.

15. The driving method according to claim 13, wherein: Before the scan driving circuit outputs the second scan signal to drive the first sub-pixel circuits, the data driving circuit has already transmitted the second data signal to each of the second sub-pixel circuits.

16. The driving method according to claim 15, wherein: After the scan driving circuit outputs the scan signal for the first time to drive the first sub-pixel circuits, the data lines connected to the second sub-pixel circuits are left unconnected.

17. The driving method according to claim 13, wherein: The scan lines include a plurality of first scan lines and a plurality of second scan lines, the first scan lines and the second scan lines are arranged alternately, the first scan lines are respectively connected to the first sub-pixel circuits in the same column, and the second scan lines are respectively connected to the second sub-pixel circuits in the same column; the driving method further includes: The scan driving circuit simultaneously drives the first sub-pixel circuit and the second sub-pixel circuit in the same column via the first scan line and the second scan line connected to the pixels in the same column.

18. The driving method according to claim 13, wherein: The frequency of the first data signal is twice or more than twice that of the second data signal.

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