CN117059009A - Micro light emitting diode display panel - Google Patents

Abstract

A micro-light emitting diode display panel includes a timing controller and a plurality of drivers. The drivers are controlled by the timing controller and are arranged according to the distance between the driver and the timing controller. Each driver contains a buffer to buffer the signal before it is sent to the next driver.

Description

Micro light emitting diode display panel

Technical field

The present invention relates to a microLED display panel, and in particular to a driver for the microLED display panel, which can prevent signals transmitted to the driver from being attenuated or distorted, thus enhancing the functionality and image of the microLED display panel. quality.

Background technique

MicroLED (microLED, mLED or μLED) display panel is a type of flat panel display, which is composed of individual microscopic light-emitting diodes with a size range of 1 to 100 microns. Compared with traditional liquid crystal display panels, micro-light-emitting diode display panels have larger contrast ratios, faster response times, and consume less power. Although micro-light-emitting diodes and organic light-emitting diodes (OLEDs) also have low power consumption characteristics, micro-light-emitting diodes use Group III-V diode technology (such as gallium nitride), so they have higher power consumption than organic light-emitting diodes. Brightness, higher luminous efficiency and longer life.

Due to the characteristics of metal wires (such as impedance and parasitic capacitance) of the glass substrate of the micro-LED display panel, signals transmitted through the metal wires will be attenuated or distorted depending on the transmission distance. An attenuated or distorted signal affects the display of the image, thereby reducing image quality. In addition, the constant current source of the micro-light-emitting diode display panel will gradually age, thus reducing the luminous brightness.

Therefore, it is urgent to propose a novel mechanism to overcome the shortcomings of traditional micro-light-emitting diode display panels.

Contents of the invention

In view of the above, one purpose of embodiments of the present invention is to provide a micro-light emitting diode display panel that can avoid attenuation or distortion of signals transmitted to the driver of the micro-light-emitting diode display panel, and can compensate for the aging of the micro-light emitting diode display panel.

According to an embodiment of the present invention, a micro-light emitting diode display panel includes a timing controller and a plurality of drivers. The drivers are controlled by the timing controller and are arranged according to the distance between the driver and the timing controller. Each driver contains a buffer to buffer the signal before it is sent to the next driver.

According to another embodiment of the present invention, each driver includes a regulator that receives a power signal from a previous driver and generates a regulated power signal for transmission to the next driver.

According to yet another embodiment of the present invention, each driver includes a first constant current source and at least one second constant current source, and the second constant current source provides a current greater than the first constant current source.

Description of the drawings

FIG. 1A shows a top view of a micro-light emitting diode display panel according to an embodiment of the present invention.

FIG. 1B shows a block diagram of a block of a micro-LED display panel according to an embodiment of the present invention.

FIG. 2 shows a block diagram of a micro-light emitting diode display panel according to the first embodiment of the present invention.

FIG. 3A shows a block diagram of a micro-LED display panel alternative to the first embodiment of the present invention.

Figure 3B shows the timing diagram of the serial transmission signal.

4A and 4B show a block diagram of a micro-light emitting diode display panel according to a second embodiment of the present invention.

FIG. 5 shows a block diagram of a micro-light emitting diode display panel according to a third embodiment of the present invention.

FIG. 6 shows a block diagram of a micro-light emitting diode display panel according to an alternative third embodiment of the present invention.

FIG. 7A shows a block diagram of a micro-light emitting diode display panel according to the fourth embodiment of the present invention.

FIG. 7B illustrates a circuit diagram of the first constant current source and the second constant current source of the driver.

[Description of main component symbols]

100: Micro-luminescent diode display panel 101: Display area

102: Block 11: Drive

111: Buffer 112: Regulator

113: First constant current source 114: Second constant current source

115: Constant current output circuit 12: Sequence controller

13: Micro-luminescent diode SIO: serial input and output

/CS: Chip select signal /OE: Output enable signal

DIR: direction signal I1～I9: input signal

O1～O9: Output signal VAA: Power signal

VAA_O: Adjust power signal SW: Switch

Detailed ways

FIG. 1A shows a top view of a microlight emitting diode (microLED) display panel 100 according to an embodiment of the present invention. The display area 101 of the micro-LED display panel 100 is divided into a plurality of blocks 102, and each block 102 is driven by a corresponding driver 11 (such as an integrated circuit). The micro-LED display panel 100 may include at least one timing controller 12 for controlling the driver 11 to transmit signals to or receive signals from the timing controller 12 . In this specification, a signal may be a digital signal or an analog signal. In one embodiment, the signal is a transmission signal, which may be a data signal or a control signal. In another embodiment, the signal is a power signal (eg, voltage), which is related to the power supply.

FIG. 1B shows a block diagram of the block 102 of the micro-LED display panel 100 according to the embodiment of the present invention. In this embodiment, the block 102 may include a plurality of micro-light-emitting diodes 13 arranged in an array, and the driver 11 drives the micro-light-emitting diodes 13 using a passive matrix addressing mechanism. The anodes of the micro-light-emitting diodes 13 in the same row are electrically connected to the driver 11 , and the cathodes of the micro-light-emitting diodes 13 in the same column are electrically connected to the driver 11 .

FIG. 2 shows a block diagram of the micro-LED display panel 100 according to the first embodiment of the present invention. As illustrated in FIG. 2 , a plurality of drivers 11 (for example, the first to nth drivers 11 of the m-th row) are controlled by the timing controller 12 . Arrange according to the distance between the driver 11 and the timing controller 12 so that the first driver (m, 1) is closest to the timing controller 12 and the last driver (m, n) is farthest from the timing controller 12.

In this embodiment, the driver 11 is selected by a chip select signal /CS (an active-low signal in this embodiment), and the output of the driver 11 is enabled by an output enable) signal /OE (in this embodiment, a low-state active signal) to enable. In addition, the driver 11 uses serial communication (or serial input/output (SIO)) to transmit signals one bit at a time sequentially to transmit signals to or receive signals from the timing controller 12 . The signal transmission direction between the driver 11 and the timing controller 12 can be set by the direction signal DIR. For example, when the direction signal DIR is in a high state ("1"), the signal (from the driver 11) is transmitted to the timing controller 12; when the direction signal DIR is in a low state ("0"), the signal from the driver 11 (from the timing controller 12)Receive signal. In this embodiment, the driver 11 may include a corresponding buffer 111 (a bidirectional buffer in this embodiment) to buffer signals received from adjacent drivers 11 . Since the signal is buffered before being transmitted to the next driver 11, the signal is not attenuated or distorted when transmitted to the driver 11.

FIG. 3A shows a block diagram of a micro-LED display panel 100 according to an alternative first embodiment of the present invention, and FIG. 3B shows a timing diagram of serial transmission signals. Different from the use of the chip select signal /CS, the output enable signal /OE and the direction signal DIR in FIG. 2, in this embodiment, the chip select, output enable and transmission direction of the driver 11 can be marked by the signals transmitted by the timing controller 12. The header is set before transmitting data.

4A and 4B show a block diagram of a micro-light emitting diode display panel 100 according to a second embodiment of the present invention. As shown in FIG. 4A , parallel communication is used to input signals (such as input signals I1 to I9 ) (from the timing controller 12 ) to the driver 11 . As shown in FIG. 4B , parallel communication is used to input signals (such as output signals O1～O9)) are output from the driver 11 (to the timing controller 12).

In this embodiment, a plurality of drivers 11 are spaced apart to transmit signals. In other words, the buffered signal (buffered via the (unidirectional) buffer 111) is not transmitted to the directly adjacent driver 11, but is separated by a plurality of drivers 11. As shown in FIG. 4A , the input signal I4 is buffered by the buffer BF4 of the first driver 11 and then transmitted to the fourth driver 11 instead of being transmitted to the adjacent second driver 11 . As shown in FIG. 4B , the buffered signal of the fourth driver 11 is sent to the first driver 11 (and then sent out as the output signal O4 after being buffered) instead of being sent to the adjacent third driver 11 . In an alternative embodiment, the unidirectional buffer 11 can be replaced by a bidirectional buffer for bidirectional transmission.

FIG. 5 shows a block diagram of a micro-LED display panel 100 according to a third embodiment of the present invention. In this embodiment, the driver 11 may include a (power) regulator 112, such as a voltage regulator, which receives the power signal VAA and generates a regulated power signal VAA_O accordingly.

In this embodiment, multiple drivers 11 are spaced apart to transmit power signals. In other words, the regulated power signal (generated via the regulator 112 ) is not transmitted to directly adjacent drivers 11 , but to a plurality of drivers 11 spaced apart. As illustrated in FIG. 5 , the adjusted power signal VAA_O is transmitted from the first driver (m,1) to the fourth driver (m,4) instead of to the adjacent second driver (m,2). Since the power signal has been conditioned before being transmitted to the next driver 11, the power signal will not be attenuated or distorted when transmitted to the driver 11.

FIG. 6 shows a block diagram of a micro-LED display panel 100 according to an alternative third embodiment of the present invention. The micro-LED display panel 100 of FIG. 6 is similar to the micro-LED display panel 100 of FIG. 5 , and the differences are described as follows.

In the micro-LED display panel 100 of FIG. 6 , multiple power signals VAA (in parallel) are input to the driver 11 at a time. However, in the micro-LED display panel 100 of FIG. 5 , only one power signal VAA is input to the driver at a time. 11. As shown in Figure 6, the power signal VAA is input to the first driver (m, 1) and the fourth driver (m, 4) at the same time, and then the adjusted power signal VAA_O is sent from the fourth driver (m, 4) to the seventh driver (m, 4). m,7).

FIG. 7A shows a block diagram of a micro-LED display panel 100 according to the fourth embodiment of the present invention. The driver 11 may include a first constant current source 113 and at least one second constant current source 114 . The second constant current source 114 provides a current greater than the first constant current source 113 . FIG. 7B illustrates a circuit diagram of the first constant current source 113 and the second constant current source 114 of the driver 11 .

The switch SW (controlled by the timing controller 12 or other controllers) selects one of the outputs of the first constant current source 113 and the second constant current source 114, and then feeds the selected output to the constant current output circuit 115 to output Multiple constant currents. The second constant current source 114 is used to collect aging-related parameters, such as brightness and forward voltage, so as to obtain design parameters for compensating the aging of the micro-LED display panel 100 .

The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention has been disclosed above in preferred embodiments, they are not intended to limit the present invention. Anyone familiar with the art Skilled personnel, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modifications to equivalent embodiments with equivalent changes. However, any content that does not depart from the technical solution of the present invention shall be based on this Technical Essence of the Invention Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the invention.

Claims (15)

1. A micro-luminescent diode display panel, characterized in that it contains: timing controller; and A plurality of drivers are controlled by the timing controller and are arranged according to the distance between the driver and the timing controller; Each driver contains a buffer to buffer the signal before it is sent to the next driver. 2. The micro-LED display panel of claim 1, wherein the driver uses serial communication to transmit signals to or receive signals from the timing controller. 3. The micro-light emitting diode display panel according to claim 2, wherein the buffer includes a bidirectional buffer. 4. The micro-light emitting diode display panel according to claim 3, wherein the driver is selected by a chip select signal, the output of the driver is enabled by an output enable signal, and the driver and the timing control The direction of signal transmission between devices is set by the direction signal. 5. The micro-LED display panel according to claim 3, wherein the chip selection, output enable and transmission direction of the driver are set by the header of the transmission signal of the timing controller. 6. The micro-LED display panel according to claim 2, wherein the buffer receives signals from adjacent drivers or transmits signals to adjacent drivers. 7. The micro-LED display panel of claim 1, wherein the driver uses parallel communication to transmit signals to or receive signals from the timing controller. 8. The micro-LED display panel according to claim 7, wherein a plurality of drivers are spaced apart to transmit signals. 9. A micro-luminescent diode display panel, characterized by containing: timing controller; and A plurality of drivers are controlled by the timing controller and are arranged according to the distance between the driver and the timing controller; Each driver includes a regulator that receives a power signal from a previous driver and generates a regulated power signal for transmission to the next driver. 10. The micro-LED display panel according to claim 9, wherein a plurality of drivers are spaced apart to transmit power signals. 11. The micro-LED display panel according to claim 10, wherein multiple power signals are input to the multiple drivers at a time. 12. A micro-luminescent diode display panel, characterized by containing: timing controller; and Multiple drivers are controlled by the timing controller; Each driver includes a first constant current source and at least one second constant current source. The second constant current source provides a current greater than the first constant current source. 13. The micro-light emitting diode display panel according to claim 12, wherein the driver further includes a switch that selects one of the outputs of the first constant current source and the second constant current source. 14. The micro-LED display panel according to claim 13, wherein the switch is controlled by the timing controller. 15. The micro-LED display panel according to claim 13, wherein the selected output of the switch is fed to a constant current output circuit to output a plurality of constant currents.