CN115346477A - Micro light emitting diode display device and driving method thereof - Google Patents
Micro light emitting diode display device and driving method thereof Download PDFInfo
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- CN115346477A CN115346477A CN202211052947.8A CN202211052947A CN115346477A CN 115346477 A CN115346477 A CN 115346477A CN 202211052947 A CN202211052947 A CN 202211052947A CN 115346477 A CN115346477 A CN 115346477A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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Abstract
The invention discloses a micro light-emitting diode display device and a driving method thereof. The display device comprises a display substrate and a data driving circuit. The display substrate comprises a plurality of pixels, each pixel comprises a first sub-pixel and a second sub-pixel, the first sub-pixel is provided with a first sub-pixel circuit and a first light-emitting element electrically connected with the first sub-pixel circuit, the second sub-pixel is provided with a second sub-pixel circuit and a second light-emitting element electrically connected with the second sub-pixel circuit, and the first sub-pixel circuit and the second sub-pixel circuit are independently configured. The data driving circuit is electrically connected with the first sub-pixel circuits and the second sub-pixel circuits; 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, wherein the first data signal is a PWM signal and the second data signal is a PAM signal.
Description
Technical Field
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
The existing micro light emitting diode display device comprises a plurality of pixels, the circuits of the pixels are all the same, and the micro light emitting diodes of all the pixels are controlled to emit light by a Pulse-width modulation (PWM) technology, but the Pulse-width modulation control has the problems that the high-current characteristic charging time of a circuit is short at the moment of panel lighting, and voltage drop (IR drop) is generated in high-resolution display; or, pulse-Amplitude Modulation (PAM) is used to control the light emission of the micro leds of all pixels, but the wavelength of the micro leds may shift under different current densities, which causes a serious color shift of the display image.
Disclosure of Invention
The invention aims to provide a micro light-emitting diode display device with sub-pixel circuits which are independently configured and a driving method thereof.
To achieve the above objective, a micro light emitting diode display device according to the present invention includes a display substrate and a data driving circuit. The display substrate comprises a plurality of pixels, each pixel comprises a first sub-pixel and a second sub-pixel, the first sub-pixel is provided with a first sub-pixel circuit and a first light-emitting element electrically connected with the first sub-pixel circuit, the second sub-pixel is provided with a second sub-pixel circuit and a second light-emitting element electrically connected with the second sub-pixel circuit, and the first sub-pixel circuit and the second sub-pixel circuit are independently configured. The data driving circuit is electrically connected with the first sub-pixel circuits and the second sub-pixel circuits through a plurality of data lines; 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, wherein the first data signal is a Pulse Width Modulation (PWM) signal, and the second data signal is a Pulse Amplitude Modulation (PAM) signal.
To achieve the above objects, a driving method of a micro led display device according to the present invention includes a display substrate and a data driving circuit; the display substrate comprises a plurality of pixels, each pixel comprises a first sub-pixel and a second sub-pixel, the first sub-pixel is provided with a first sub-pixel circuit and a first light-emitting element electrically connected with the first sub-pixel circuit, the second sub-pixel is provided with a second sub-pixel circuit and a second light-emitting element electrically connected with the second sub-pixel circuit, and the first sub-pixel circuit and the second sub-pixel circuit are independently configured; the data driving circuit is electrically connected with the first sub-pixel circuits and the second sub-pixel circuits through a plurality of data lines; the driving method at least comprises the following steps: transmitting a first data signal to each first sub-pixel circuit by the data driving circuit to drive each first light-emitting element; and transmitting a second data signal to each second sub-pixel circuit by the data driving circuit to drive each second light-emitting element; wherein the first data signal is a Pulse Width Modulation (PWM) signal and the second data signal is a Pulse Amplitude Modulation (PAM) signal.
As described above, in the micro light emitting diode display device and the driving method thereof according to the present invention, each pixel includes two first sub-pixel circuits and two second sub-pixel circuits configured independently from each other, 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 transmit a second data signal (PAM signal) to each second sub-pixel circuit to drive each second light emitting element to emit light. Therefore, compared with the prior art that the circuits of all pixels (sub-pixels) of the micro light-emitting diode display device are the same, and the light-emitting elements of all pixels are controlled to emit light by the PWM technology or the light-emitting elements of all pixels are controlled to emit light by the PAM technology, the micro light-emitting diode display device and the driving method thereof are different from the prior art, and the color cast problem controlled by the PAM technology can be solved and high-resolution display can be supported by two sub-pixel circuits which are independently configured.
Drawings
Fig. 1A is a schematic view of a micro light emitting diode display device according to an embodiment of the invention.
Fig. 1B is a schematic view of a micro led display device according to another embodiment of the invention.
Fig. 2A and fig. 2B are schematic diagrams of a first sub-pixel circuit and a second sub-pixel circuit of each pixel in the micro led display device of fig. 1A or fig. 1B, respectively.
Fig. 3 is a schematic driving waveform diagram of the micro led display device shown in fig. 1A or fig. 1B.
Fig. 4A and 4B are schematic diagrams of a first sub-pixel circuit and a second sub-pixel circuit, respectively, according to another embodiment of the invention.
FIG. 4C is a schematic diagram of a first sub-pixel circuit according to yet another embodiment of the present invention.
Fig. 4D is a schematic diagram illustrating connection between a pixel and a scan line and a data line according to an embodiment of the invention.
Fig. 4E is a schematic diagram of the signal waveform of fig. 4D.
FIG. 5 is a schematic diagram of a micro LED display device according to various embodiments of the present invention.
Detailed Description
The micro light emitting diode display device and the driving method thereof according to the embodiments of the present invention will be described with reference to the accompanying drawings, wherein like elements are described with like reference numerals.
Fig. 1A and 1B are schematic diagrams of a micro led display device according to different embodiments of the invention, fig. 2A and 2B are schematic diagrams of a first sub-pixel circuit and a second sub-pixel circuit of each pixel in the micro led display device of fig. 1A or 1B, respectively, and fig. 3 is a schematic diagram of a driving waveform of the micro led display device of fig. 1A or 1B.
Referring to fig. 1A, fig. 2A and fig. 2B, the micro led display device 1 is an Active Matrix (Active Matrix) micro led display device, and may include a display substrate 11 and a data driving circuit. The data driving circuit of the present embodiment may include a first data driving circuit 12a and a second data driving circuit 12b.
The display substrate 11 includes a plurality of pixels P arranged in a matrix of rows (columns) and columns (rows). 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 (fig. 2A) electrically connected to the first sub-pixel circuit PC1, the second sub-pixel P2 has a second sub-pixel circuit PC2 and a second light emitting element L2 (fig. 2B) electrically connected to the second sub-pixel circuit PC2, 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 circuits (not integrated) and different from each other, and the first light emitting element L1 may be a micro light emitting diode emitting red light, and the second light emitting element L2 may be a micro light emitting diode emitting green light or blue light. Each pixel P of this embodiment includes a 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 light emitting diode capable of emitting 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 light emitting diode capable of emitting 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 light emitting diode capable of emitting blue light).
The data driving circuit can be electrically connected with the first sub-pixel circuits and the second sub-pixel circuits through a plurality of data lines; 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 the present 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 through 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 through the plurality of second data lines DL 2. Thus, the first data driving circuit 12a can transmit the first data signal D through each of the first data lines DL1 respectively 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 via each second data line DL2 P2 To each second sub-pixel circuit PC2 to drive each second light emitting element L2 to emit light. Wherein the first data signal D P1 Is a Pulse Width Modulation (PWM) signal, and a second data signal D P2 Is a Pulse Amplitude Modulation (PAM) signal, and thus, the first data driving circuit 12a is enabledThe data driver for outputting the PWM signal, and the second data driving circuit 12b is a data driver capable of outputting the PAM signal. Better driving efficiency can be achieved by such a design.
In a different embodiment, as shown in fig. 1B, only one data driving circuit 12 may be provided, and the data driving circuit 12 may be electrically connected to the first sub-pixel circuits PC1 via a plurality of first data lines DL1 and electrically connected to the second sub-pixel circuits PC2 via a plurality of second data lines DL 2. Thus, the data driving circuit 12 can transmit the first data signal D through each of the first data lines DL1 respectively 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 via each second data line DL2 P2 To each second sub-pixel circuit PC2 to drive each second light emitting element L2 to emit light.
In addition, referring to fig. 1A, the micro light emitting diode display device 1 of the present embodiment may further include a scan driving circuit 13, and the scan driving circuit 13 may be electrically connected to the first sub-pixel circuits PC1 and the second sub-pixel circuits PC2 through a plurality of scan lines S1 to Sm. The scan driving circuit 13 sequentially outputs scan signals through the scan lines S1 to Sm and transmits the scan signals to the first sub-pixel circuit PC1 and the second sub-pixel circuit PC2 of each row of pixels P, so as to drive the first light-emitting element L1 and the second light-emitting element L2 of each row of pixels P to emit light.
Therefore, in the micro led display device 1 of the present embodiment, when the scan lines S1 to Sm sequentially conduct the rows of pixels P by the scan signals sequentially output by the scan driving circuit 13, the first data driving circuit 12a can transmit the first data signals D corresponding to each row of pixels P P1 (PWM signals) are 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 transmit the second data signals D corresponding to each row of pixels P P2 (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 the first and second light-emitting elements L1 and L2 of the pixels P, and the display device can display imageLike this. The first sub-pixel circuit PC1 may be driven according to the PWM data voltage (first data signal D) P1 ) The driving time of the driving current supplied to the first light emitting element L1 is controlled and the second sub-pixel circuit PC2 may be driven according to the PAM data voltage (the second data signal D) P2 ) The amplitude of the driving current supplied to the second light emitting element L2 is controlled. Here, the first light emitting element L1 is a red micro light emitting diode, PWM data voltage (first data signal D) P1 ) The red micro LED with poor efficiency at low current density can have better efficiency under PWM control, the second light-emitting element L2 is a green or blue micro LED, and PAM data voltage (the second data signal D) P2 ) The micro light emitting diode which is less influenced by wavelength shift under different current densities can achieve the display requirement of high resolution by PAM control.
In the micro led display device 1 shown in fig. 1A, 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 configured independently of each other, and 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 transmit the second data signal D respectively P2 The (PAM signal) is applied to each second sub-pixel circuit PC2 to drive each second light-emitting device L2 to emit light, so that, compared to the conventional micro light-emitting diode display device in which all the circuits of all the pixels (sub-pixels) are the same, and the PWM technique is used to control the light-emitting devices of all the pixels to emit light, or the PAM technique is used to control the light-emitting devices of all the pixels to emit light, the micro light-emitting diode display device 1 of the present embodiment simultaneously controls different sub-pixel circuits of each pixel by using the PWM and PAM techniques, so that the micro light-emitting diode display device is a new type of micro light-emitting diode display device different from the conventional method.
Referring to fig. 2A, fig. 2B and fig. 3, the first sub-pixel circuit PC1 and the second sub-pixel circuit PC2 of each pixel P and the driving thereof according to the above-mentioned embodiments will be described in detail. It should be noted that the reference symbols S1 to Sm, si, SL1 and SL2 shown in the embodiments of fig. 2A to 4E may represent scan lines or scan signals, depending on the application. In addition, i can be between 1 and m (1 ≦ i ≦ m), and m, n are positive integers (m is the number of scan lines, n is the number of data lines). Further, a "control terminal" of a transistor appearing herein below may be a gate of the transistor, a "first terminal" may be a first source/drain of the transistor, and a "second terminal" may be a second source/drain of the transistor.
The first sub-pixel circuit PC1 in the embodiment of fig. 2A is, for example, a 2T circuit architecture, but not limited thereto, and in different embodiments, the first sub-pixel circuit PC1 may also be another circuit architecture, for example, a 1T circuit architecture having only one switching transistor, or another circuit architecture, but not limited thereto. In addition, the second sub-pixel circuit PC2 in the embodiment of fig. 2B is, for example, a 2T1C circuit architecture, but not limited thereto, and in different embodiments, the first sub-pixel circuit PC1 may also be another circuit architecture.
As shown in fig. 2A, the first sub-pixel circuit PC1 of the present embodiment has a switching transistor T1 and a driving transistor T2. The switching transistor T1 can be controlled by a scan signal to be turned on to receive the first data signal D P1 . The control terminal of the switching transistor T1 is connected to a scan line Si for receiving a scan signal, and the first terminal of the switching transistor T1 is connected to the first data line DL1 for receiving the first data signal D P1 A second terminal of the switching transistor T1 is connected to a control terminal of the driving transistor T2, and a first terminal of the driving transistor T2 is connected to a first voltage V DD A second terminal of the driving transistor T2 is connected to one terminal of the first light emitting element L1, and the other terminal of the first light emitting element L1 is electrically connected to a second voltage V EE . Thereby, the driving transistor T2 can be driven according to the first data signal D transmitted through the switching transistor T1 P1 The first light emitting element L1 is driven to emit light. Particularly, because the first data signal D P1 Is a PWM signal, therefore, the first sub-pixel circuit PC1 does not have a signal for holding a potential,A capacitor for stabilizing the voltage. In addition, the switch transistor T1 and the driving transistor T2 of the present 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.
As shown in FIG. 2B, the second sub-pixel circuit PC2 has a second data signal D in addition to the switching transistor T1 and the driving transistor T2 P2 The PAM signal is supplied, and therefore, the second sub-pixel circuit PC2 further has 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.
As shown in fig. 3, during 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) 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 light emitting diode (the first light emitting element L1) is very low at low current density, the scan driving circuit 13 of the present embodiment can provide two scan signals to turn on the switching transistor T1 of the first sub-pixel circuit PC1 twice during one frame period FT, so that the first data driving circuit 12a can provide the first data signal D twice correspondingly P1 For the first sub-pixel circuit PC1, the first light emitting element L1 (red micro led) can have a higher current density to achieve a high efficiency operation, thereby achieving a power saving purpose and simultaneously enabling the display device to have a higher brightness. In some embodiments, the scan driving circuit 13 may also output more than two (e.g., three, four) scan signals to drive the first sub-pixel circuits PC1, so that the first data driving circuit 12a correspondingly provides more than two first data signals D P1 (PWM signal) to the first sub-pixel circuits PC1, the present invention is not limited.
In addition, the first and second substrates are,since the second sub-pixel circuit PC2 has the capacitor C for holding the driving current of the second light emitting element L2, the second data driving circuit 12b only needs to supply the second data signal D once during the frame period FT P2 (PAM signal) to each second sub-pixel circuit PC2, each second light emitting element L2 (green and blue micro light emitting diodes) is lit. In the embodiment, before the scan driving circuit 13 outputs the second scan signal to drive the first sub-pixel circuits PC1 (i.e. the first data driving circuit 12a transmits the first data signal D for the second time) P1 Before each first sub-pixel circuit PC 1), the second data driving circuit 12b has transmitted the second data signal D P2 To each second sub-pixel circuit PC2. Therefore, 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 may be connected to the idle line, thereby saving power.
Furthermore, as can also be seen from fig. 3, the first data signal D P1 May be the second data signal D P2 Twice or more the frequency. The first data signal D supplied to the first sub-pixel circuit PC1 is at a frequency of at least 60Hz P1 The frequency of (c) can be equal to or greater than 120Hz, or greater than twice, so that human eyes do not feel that the picture flickers.
In particular, in different embodiments, each pixel P may also include two first sub-pixel circuits PC1 and a second sub-pixel circuit PC2, wherein one of the first sub-pixel circuits PC1 may 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 capable of emitting red light), the other one of the first sub-pixel circuits PC1 may drive the corresponding first light-emitting element L1 to emit green light (i.e. the other one of the first light-emitting elements L1 is a micro light-emitting diode capable of emitting green light), and the second sub-pixel circuit PC2 may 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 capable of emitting blue light), so that the first data driving circuit 12a may provide the first data signal D twice respectively P1 To the two first sub-pixel circuits PC1, red is givenThe light micro light emitting diode (one of the first light emitting elements L1) can have a higher current density, thereby achieving the purpose of saving power, and simultaneously improving the color cast phenomenon of the green light micro light emitting diode (i.e. the other first light emitting element L1).
Referring to fig. 4A to 4E, fig. 4A and 4B are schematic diagrams of a first sub-pixel circuit and a second sub-pixel circuit according to another embodiment of the present invention, respectively, fig. 4C is a schematic diagram of a first sub-pixel circuit according to another embodiment of the present invention, fig. 4D is a schematic diagram of connection between a pixel and a scan line and a data line according to an embodiment of the present invention, and fig. 4E is a schematic diagram of signal waveforms of fig. 4D.
Referring to fig. 4A and 4B, the first sub-pixel circuit and the second sub-pixel circuit of the present embodiment are substantially the same as those of fig. 2A and 2B in terms of their component composition and connection relationship of the components. The difference is that the scan lines of the present embodiment may include a plurality of first scan lines SL1 and a plurality of second scan lines SL2, and the first scan lines SL1 and the second scan lines SL2 are disposed alternately. The first scan lines SL1 are respectively connected to the first sub-pixel circuits PC1 in the same row, and the second scan lines SL2 are respectively connected to the second sub-pixel circuits PC2 in the same row.
In a different embodiment, as shown in fig. 4C, the first sub-pixel circuit PC1 may not have the driving transistor T2, but directly control the light emission of the first light emitting element L1 with the switching transistor T1. Here, when the switching transistor T1 is turned on by a signal of the first scan line SL1, the first voltage V is set to be lower than the second voltage V DD And a first data signal D P1 (PWM signal) may be supplied to the first light emitting elements L1 via the switching transistors T1, respectively, to control light emission of the first light emitting elements L1, whereby the first voltage V may be reduced DD Or the first data signal D P1 Pressure drop of (d).
As shown in fig. 4D, the micro light-emitting elements (L1, L2) are not shown in fig. 4D. The first sub-pixel circuit PC1 of each pixel P in the same column is connected to the same first scan line SL1, the two second sub-pixel circuits PC2 of each pixel P in the same column are connected to the same second scan line SL2, and the adjacent two first scan lines SL1 and second scan lines SL2 are connected to the first sub-pixel circuit PC1 and the two second sub-pixel circuits PC2 of each pixel P in the same column.
Therefore, as shown in fig. 4E, the scan driving circuit 13 can simultaneously drive the first sub-pixel circuit PC1 in the same column and the two second sub-pixel circuits PC2 in the same column via the first scan line SL1 and the second scan line SL2 connecting the pixels P in the same column. Since the scan lines of the first and second sub-pixel circuits PC1 and PC2 connected to the same pixel P are independent of each other, the second data line DL2 connected to the second sub-pixel circuit PC2 does not need to be connected in the idle state when the first scan line SL1 outputs the scan signal to the first sub-pixel circuit PC1 for the second time, so that the control of the second data driving circuit 12b can be relatively simple.
Fig. 5 is a schematic view of a micro led display device according to various embodiments of the present invention. The micro light emitting diode display device 1a of the present embodiment is substantially the same as the micro light emitting diode display device 1 of the previous embodiment in terms of the component composition and the connection relationship of the components. The difference is that the micro led display device 1a of the present embodiment further includes a plurality of first ICs IC1 and a second IC2. The first integrated circuits IC1 are disposed in the display area A1 of the display substrate 11a, and the first integrated circuits IC1 include first data driving circuits. In addition, the second integrated circuit IC2 is disposed in the non-display area A2 of the display substrate 11, and the second integrated circuit IC2 includes a second data driving circuit 12b. Here, each first integrated circuit IC1 is electrically connected to the first sub-pixel circuit PC1 of at least one pixel P, and the second integrated circuit IC2 is electrically connected to the second sub-pixel circuits PC2 of the pixels P.
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 the first integrated circuits IC1 are respectively disposed at the corresponding positions of the display area A1 by, for example, COB (Chip On Board) technology to respectively provide the first data signals D P1 To the corresponding first sub-pixel circuit PC1. In addition, the second data driving circuit can be made to be the secondTwo integrated circuits IC2 disposed in the non-display area A2 for providing second data signals D respectively P2 To the second sub-pixel circuits PC2.
Each of the first integrated circuits IC1 of the present embodiment is electrically connected to four first sub-pixel circuits PC1 of adjacent four pixels P to respectively provide the first data signals D P1 To four corresponding first sub-pixel circuits PC1, and the second integrated circuits IC2 are electrically connected to the second sub-pixel circuits PC2 of the pixels P via second data lines DL2, respectively, to provide second data signals D P2 To the corresponding second sub-pixel circuit PC2.
The invention also provides a driving method of the micro light-emitting diode display device, which at least comprises the following steps: transmitting a first data signal from the data driving circuit to each of the first sub-pixel circuits to drive each of the first light emitting elements; and transmitting a second data signal from the data driving circuit 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 (PWM) signal and the second data signal is a Pulse Amplitude Modulation (PAM) signal. In some embodiments, the first data signal has a frequency 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, 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.
In some embodiments, the driving method further includes: in a frame period, the scanning driving circuit outputs scanning signals at least twice to drive the first sub-pixel circuits, so that the data driving circuit provides corresponding first data signals to the first sub-pixel circuits to control the light emission of the first light-emitting elements; in some embodiments, the data driving circuit provides the second data signal to each of the second sub-pixel circuits only once during the frame period; before the scan driving circuit outputs the scan signal for the second time to drive the first sub-pixel circuits, the data driving circuit transmits the second data signal to each of the second sub-pixel circuits; after the scanning driving circuit outputs the scanning signal for the first time to drive the first sub-pixel circuits, the data lines connected to the second sub-pixel circuits are in idle connection; in some embodiments, the first sub-pixel circuit of the same row and the second sub-pixel circuit of the same row are simultaneously driven by the scan driving circuit via the first scan line and the second scan line connecting the pixels of the same row.
In addition, the above description is referred to for other technical features of the driving method of the micro light emitting diode display device of the present invention, and no further description is provided herein.
In summary, in the micro led display device and the driving method thereof according to the present invention, each pixel includes two first sub-pixel circuits and two second sub-pixel circuits configured independently from each other, and the data driving circuit can respectively transmit a first data signal (PWM signal) to each first sub-pixel circuit to drive each first light emitting element to emit light, and can also respectively transmit a second data signal (PAM signal) to each second sub-pixel circuit to drive each second light emitting element to emit light. Therefore, compared with the prior art that the circuits of all pixels (sub-pixels) of the micro light-emitting diode display device are the same, and the light-emitting elements of all pixels are controlled to emit light by the PWM technology or the light-emitting elements of all pixels are controlled to emit light by the PAM technology, the micro light-emitting diode display device and the driving method thereof are different from the prior art, and the color cast problem controlled by the PAM technology can be solved and high-resolution display can be supported by two sub-pixel circuits which are independently configured. In addition, in some embodiments, the invention can achieve high-efficiency operation, thereby achieving the purpose of saving electricity.
The foregoing is illustrative only and is not limiting. It is intended that all equivalent modifications or variations without departing from the spirit and scope of the present invention shall be included in the appended claims.
Claims (22)
1. A miniature light emitting diode display device comprising:
a display substrate comprising a plurality of pixels, each pixel comprising:
the first sub-pixel is provided with a first sub-pixel circuit and a first light-emitting element electrically connected with the first sub-pixel circuit; and
the second sub-pixel is provided with a second sub-pixel circuit and a second light-emitting element electrically connected with the second sub-pixel circuit; the first sub-pixel circuit and the second sub-pixel circuit are configured independently; 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,
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.
2. The micro light emitting diode display device of claim 1, wherein the first light emitting element is a micro light emitting diode that emits red light and the second light emitting element is a micro light emitting diode that emits blue light.
3. The micro light emitting diode display device of claim 1, wherein each of the first sub-pixel circuits has a switching transistor, and each of the second sub-pixel circuits has a switching transistor and a capacitor for maintaining a potential of the second light emitting element.
4. The micro light emitting diode display device of claim 1, wherein each of the first sub-pixel circuits has a switching transistor and a driving transistor, a control terminal of the switching transistor is connected to a scan line for receiving a scan signal, a first terminal of the switching transistor is connected to one of the data lines for receiving the first data signal, a second terminal of the switching transistor is connected to a control terminal of the driving transistor, a first terminal of the driving transistor is connected to a first voltage, a second terminal of the driving transistor is connected to a corresponding one of the first light emitting elements, and another terminal of the first light emitting element is electrically connected to a second voltage.
5. The micro light emitting diode display device according to claim 1, wherein each of the second sub-pixel circuits has a switching transistor, a driving transistor and a capacitor, a control terminal of the switching transistor is connected to a scan line for receiving a scan signal, a first terminal of the switching transistor is connected to one of the data lines for receiving the second data signal, a second terminal of the switching transistor is connected to the control terminal of the driving transistor, a first terminal of the driving transistor is connected to a first voltage, a second terminal of the driving transistor is connected to a corresponding one of the second light emitting elements, another terminal of the second light emitting element is electrically connected to a second voltage, one terminal of the capacitor is connected to the second terminal of the switching transistor and the control terminal of the driving transistor, and another terminal of the capacitor is connected to the first voltage and the first terminal of the driving transistor.
6. The micro light emitting diode display device of claim 1, further comprising:
the scanning driving circuit is electrically connected with the first sub-pixel circuits and the second sub-pixel circuits through a plurality of scanning lines;
in one 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 corresponding first data signals to the first sub-pixel circuits to control the first light-emitting elements to emit light.
7. The micro light emitting diode display device of claim 6, wherein the data driving circuit provides the second data signal to each of the second sub-pixel circuits only once during the frame period.
8. The micro light emitting diode display device of claim 6, wherein the data driving circuit transmits the second data signal to each of the second sub-pixel circuits before the scan driving circuit outputs the scan signal for a second time to drive the first sub-pixel circuits.
9. The micro light emitting diode display device of claim 8, wherein a data line connected to the second sub-pixel circuits is blank after the scan driving circuit outputs the scan signal for the first time to drive the first sub-pixel circuits.
10. The micro light emitting diode display device of claim 6, wherein the scan lines comprise a plurality of first scan lines and a plurality of second scan lines, the first scan lines and the second scan lines are disposed alternately; the first scanning lines are respectively connected with the first sub-pixel circuits in the same row, and the second scanning lines are respectively connected with the second sub-pixel circuits in the same row.
11. The micro light emitting diode display device of claim 10, wherein the scan driving circuit simultaneously drives the first sub-pixel circuits of the same row and the second sub-pixel circuits of the same column via the first scan line and the second scan line connecting the pixels of the same row.
12. The micro light emitting diode display device of claim 1, wherein the frequency of the first data signal is two times or more than two times the frequency of the second data signal.
13. The micro light emitting diode display device of claim 1, wherein the data lines comprise a plurality of first data lines and a plurality of second data lines, the data driving circuit comprises:
the first data driving circuit is electrically connected with the first sub-pixel circuits through the first data lines; and
the second data driving circuit is electrically connected with the second sub-pixel circuits through the second data lines;
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.
14. The micro light emitting diode display device of claim 13, further comprising:
a plurality of first integrated circuits disposed in a display region of the display substrate, the first integrated circuits including the first data driving circuit; and
a second integrated circuit disposed in the non-display region 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 circuits is electrically connected to the second sub-pixel circuits of the pixels.
15. A driving method of a miniature light-emitting diode display device comprises a display substrate and a data driving circuit; the display substrate comprises a plurality of pixels, each pixel comprises a first sub-pixel and a second sub-pixel, the first sub-pixel is provided with a first sub-pixel circuit and a first light-emitting element electrically connected with the first sub-pixel circuit, the second sub-pixel is provided with a second sub-pixel circuit and a second light-emitting element electrically connected with the second sub-pixel circuit, and the first sub-pixel circuit and the second sub-pixel circuit are independently configured; the data driving circuit is electrically connected with the first sub-pixel circuits and the second sub-pixel circuits through a plurality of data lines; the driving method at least comprises the following steps:
transmitting a first data signal from the data driving circuit to each of the first sub-pixel circuits to drive each of the first light emitting elements; and
transmitting a second data signal from the data driving circuit to each of the second sub-pixel circuits to drive each of the second light emitting elements;
the first data signal is a pulse width modulation signal, and the second data signal is a pulse amplitude modulation signal.
16. The driving method according to claim 15, wherein the first light-emitting element is a micro light-emitting diode that emits red light, and the second light-emitting element is a micro light-emitting diode that emits blue light.
17. The driving method according to claim 15, wherein the micro light emitting diode display device further comprises 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 driving method further includes:
during a frame period, the scanning driving circuit outputs at least two scanning 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.
18. The driving method according to claim 17, wherein the data driving circuit supplies the second data signal to each of the second sub-pixel circuits only once during the frame period.
19. The driving method according to claim 17, wherein the data driving circuit transmits the second data signal to each of the second sub-pixel circuits before the scan driving circuit outputs the scan signal for the second time to drive the first sub-pixel circuits.
20. The driving method according to claim 19, wherein after the scan driving circuit outputs the first scan signal to drive the first sub-pixel circuits, a data line connected to the second sub-pixel circuits is connected to a null line.
21. The driving method according to claim 17, 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 of the same row, and the second scan lines are respectively connected to the second sub-pixel circuits of the same row; the driving method further includes:
the first sub-pixel circuit in the same row and the second sub-pixel circuit in the same row are simultaneously driven by the scan driving circuit via the first scan line and the second scan line connected to each pixel in the same row.
22. The driving method according to claim 15, wherein the frequency of the first data signal is twice or more than the frequency of the second data signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211052947.8A CN115346477A (en) | 2022-08-31 | 2022-08-31 | Micro light emitting diode display device and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211052947.8A CN115346477A (en) | 2022-08-31 | 2022-08-31 | Micro light emitting diode display device and driving method thereof |
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| Publication Number | Publication Date |
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| CN115346477A true CN115346477A (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211052947.8A Pending CN115346477A (en) | 2022-08-31 | 2022-08-31 | Micro light emitting diode display device and driving method thereof |
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| Country | Link |
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| CN (1) | CN115346477A (en) |
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- 2022-08-31 CN CN202211052947.8A patent/CN115346477A/en active Pending
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