Display system

Abstract

A display system includes a display panel divided into a plurality of display blocks arranged in columns and rows, each display block including a plurality of micro light emitting diodes driven by a corresponding driver and disposed in a corresponding display block; the power management unit dynamically provides different power supply voltages to the plurality of drivers respectively during a line scanning period or a frame scanning period; the time sequence controller determines different power supply voltages to the power management unit according to the data content to be displayed on the display panel.

Description

Technical Field

[0001] This invention relates to a display system, and more particularly to power management of the display system. Background Technology

[0002] MicroLED (mLED, μLED) display panels are a type of flat panel display panel composed of individual microscopic light-emitting diodes with sizes ranging from 1 to 100 micrometers. Compared to traditional LCD panels, microLED display panels offer higher contrast, faster response times, and lower power consumption. While both microLEDs and OLEDs share low power consumption, microLEDs, utilizing III-V diode technology (such as gallium nitride), exhibit higher brightness, higher luminous efficacy, and longer lifespan compared to OLEDs.

[0003] Traditional micro-LED display systems can use pulse width modulation (PWM) mechanisms to generate pulse width modulation signals, the duty cycle of which is proportional to the brightness (or intensity) of the data provided to the micro-LED display panel.

[0004] Traditional micro-LED display systems, regardless of whether they use pulse width modulation mechanisms, suffer from low power efficiency because they provide a fixed power supply to a changing load.

[0005] Therefore, there is an urgent need to propose a novel mechanism to overcome the many shortcomings of traditional micro-LED display systems. Summary of the Invention

[0006] In view of the above, one of the objectives of this invention is to provide a display system that can dynamically provide different power supply voltages to the driver, thereby effectively improving the overall power efficiency of the display panel.

[0007] According to an embodiment of the present invention, a display system includes a display panel, a power management unit, and a timing controller. The display panel is divided into multiple display blocks arranged in columns and rows. Each display block contains multiple micro light-emitting diodes (LEDs) driven by corresponding drivers and disposed in the corresponding display block. The power management unit dynamically provides different power supply voltages to the multiple drivers during line scanning or frame scanning. The timing controller determines the different power supply voltages to the power management unit based on the data content to be displayed on the display panel.

[0008] According to an embodiment of the present invention, the power management unit includes a power generator for generating the different power supply voltages.

[0009] According to an embodiment of the present invention, the drivers of the display panel are divided into multiple groups.

[0010] According to an embodiment of the present invention, the power supply voltage is determined based on the total current required by the corresponding group of drivers during line scan or frame scan, such that the minimum power supply voltage is sufficient to provide the total current required by the corresponding group of drivers.

[0011] According to an embodiment of the present invention, the timing controller determines the total current required by the corresponding group of drivers based on the duty cycle of the pulse width modulation data signal during line scanning or frame scanning.

[0012] According to an embodiment of the present invention, the power supply voltage is obtained by multiplying the required total current by the total equivalent impedance and adding the voltage drop of the micro light-emitting diode.

[0013] According to an embodiment of the present invention, the total equivalent impedance includes the following series impedances:

[0014] The impedance of the external conductor lies between the power input pad of the driver and the power output pad of the power management unit, which is used to provide the power supply voltage.

[0015] The equivalent internal impedance of the power input pad of the driver;

[0016] The equivalent internal impedance of the common power pad of the driver; and

[0017] The impedance of the external conductor lies between the common power pad and the common node of the driver.

[0018] According to an embodiment of the present invention, the timing controller determines the total current required by the corresponding group of drivers based on the data signal during line scanning or frame scanning, and determines the power supply voltage of the corresponding group of drivers based on the determined total current.

[0019] According to an embodiment of the present invention, each group of drivers is grounded.

[0020] According to an embodiment of the present invention, all groups of drivers are grounded together.

[0021] According to an embodiment of the present invention, the driver includes:

[0022] The first circuit activates at least one column of micro-light-emitting diodes at any given time; and

[0023] The second circuit provides pulse width modulation data signals to the micro LEDs in the enabled column;

[0024] The duty cycle of each pulse width modulation data signal is proportional to the brightness of the data provided to the display panel. Attached Figure Description

[0025] Figure 1 A schematic diagram of a display panel according to an embodiment of the present invention is shown, which can be divided into multiple display blocks arranged in columns and rows.

[0026] Figure 2 A block diagram showing the display system according to an embodiment of the present invention.

[0027] Figure 3 Example Figure 2 Display the timing diagram of the system's data signals.

[0028] Figure 4A and Figure 4B A block diagram showing the display system according to an embodiment of the present invention.

[0029] Figure 5 A simplified circuit diagram showing the series impedance to form the total equivalent impedance.

[0030] Figure label:

[0031] 100: Display System

[0032] 10: Display Panel

[0033] 11: Display Block

[0034] 12: Drive

[0035] 121: First Circuit

[0036] 1211: Scan line

[0037] 122: Second Circuit

[0038] 1221: Data Line

[0039] 13: Micro LED

[0040] 14: Timing Controller

[0041] 15: Power Management Unit

[0042] 151: Power Generator

[0043] HDE: Line scan signal

[0044] D1~D8: Data Line

[0045] AVDD: Power supply voltage

[0046] AVDD1~AVDDn: Power supply voltage

[0047] VCOM: Common Voltage Node

[0048] R_A: Impedance of the external conductor

[0049] R_mosA: Equivalent internal impedance

[0050] R_mosB: Equivalent internal impedance

[0051] R_GND: Resistance of external wires Detailed Implementation

[0052] Figure 1 A schematic diagram of a display panel 10 according to an embodiment of the present invention is shown. It can be divided into multiple display blocks 11 arranged in columns and rows. Each display block 11 contains multiple microlight-emitting diodes (microLEDs) driven by a corresponding driver 12 and disposed in the corresponding display block 11.

[0053] Figure 2 A block diagram showing a display system 100 according to an embodiment of the present invention is provided. The driver 12 may include a first circuit 121 that activates at least one column of micro-light-emitting diodes 13 at any given time via scan lines 1211. The driver 12 may include a second circuit 122 that provides a pulse-width modulated (PWM) data signal to the activated column of micro-light-emitting diodes 13 via data lines 1221 (or channels). It is noteworthy that the duty cycle of the PWM data signal is proportional to the brightness of the data provided to the display panel 10.

[0054] Figure 3 Example Figure 2 This is a timing diagram of the data signals of the display system 100. The (horizontal) line scan signal HDE defines the scanning of a (on) column of micro-LEDs 13 during the line scan period. As illustrated, data signals for odd-numbered data lines (D1, D3, D5, D7…) are provided at the beginning of the line scan period, while data signals for even-numbered data lines (D2, D4, D6, D8…) are provided at the end of the line scan period. Therefore, the data lines do not provide data signals simultaneously, thus avoiding the problem of peak power consumption at the beginning of the line scan period.

[0055] Figure 4A and Figure 4B A block diagram showing a display system 100 according to an embodiment of the present invention. In this embodiment, the drivers 12 (of the display panel 10) can be grouped (e.g., three drivers 12 are grouped together, such as...). Figure 4A , Figure 4B (As illustrated). It is worth noting that, considering the impedance of the grounding, each group of drivers 12 can be grounded separately (e.g., Figure 4A (as shown in Figure 4B), or all drivers 12 can be grounded together (as shown in Figure 4B).

[0056] According to one of the features of this embodiment, the display system 100 may include a power management unit 15, which may include a power generator 151, for dynamically generating and providing multiple different power supply voltages AVDD1 to AVDDn to each group of drivers 12 during line scanning (to scan a line) or frame scanning (to scan a frame).

[0057] In this embodiment, the display system 100 may include a timing controller 14. During line scanning or frame scanning, the timing controller 14 may determine the total current required by the corresponding group driver 12 based on the duty cycle (i.e., data content) of the pulse width modulation data signal. The timing controller 14 may determine the power supply voltage AVDDx (x = 1 to n) based on the total current required by the corresponding group driver 12 during line scanning or frame scanning, such that the minimum power supply voltage is sufficient to provide the total current required by the corresponding group driver 12. Then, the determined power supply voltage AVDDx is fed to the power management unit 15 to generate power supply voltages AVDD1 to AVDDn. This effectively improves the overall power efficiency of the display panel 10.

[0058] Figure 5 A simplified circuit diagram showing the series impedance to form the total equivalent impedance is shown. The series impedance may include: (1) the impedance R_A of the external conductor (e.g., located on a printed circuit board) between the power input pad of driver 12 and the power output pad of power management unit 15 (which provides the power supply voltage AVDD); (2) the equivalent internal impedance R_mosA of the power input pad of driver 12; (3) the equivalent internal impedance R_mosB of the common power pad of driver 12; and (4) the impedance R_GND of the external conductor (e.g., located on a printed circuit board) between the common power pad of driver 12 and the common voltage node VCOM.

[0059] Multiplying the total current determined above by the total equivalent impedance, and adding the voltage drop of the micro LED 13, we can obtain the power supply voltage AVDD of the corresponding driver group 12 during line scanning or frame scanning, which can be expressed as follows:

[0060] AVDD=Vd+I_total x(R_A+R_mosA+R_mosB+R_GND)

[0061] Where Vd represents the voltage drop of the micro LED 13, and I_total represents the total current required by the corresponding group of drivers 12.

[0062] According to the above embodiment, since the data signal is pulse-width modulated according to the brightness of the corresponding data, the brightness of the data (i.e., the data content) affects the total current I_total, which in turn affects the power supply voltage AVDD. Therefore, by adjusting the power supply voltage AVDD in a timely manner according to the data content, the overall power efficiency of the display panel 10 can be effectively improved.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the patent application of the present invention; all other equivalent changes or modifications made without departing from the spirit disclosed in the invention should be included in the scope of the patent application below.

Claims

1. A display system, characterized in that, Include: The display panel is divided into multiple display blocks arranged in columns and rows. Each display block contains multiple micro light-emitting diodes, which are driven by corresponding drivers and are located in the corresponding display block. The power management unit dynamically provides different power supply voltages to the multiple drivers during line scanning or frame scanning, respectively. and The timing controller determines the different power supply voltages to the power management unit based on the data content to be displayed on the display panel.

2. The display system as described in claim 1, characterized in that, The power management unit includes a power generator for generating the different power supply voltages.

3. The display system as described in claim 1, characterized in that, The display panel's drivers are divided into multiple groups.

4. The display system as described in claim 3, characterized in that, The power supply voltage is determined based on the total current required by the corresponding group of drivers during line scan or frame scan, such that the minimum power supply voltage is sufficient to provide the total current required by the corresponding group of drivers.

5. The display system as described in claim 4, characterized in that, During line scan or frame scan, the timing controller determines the total current required by the corresponding group of drivers based on the duty cycle of the pulse width modulation data signal.

6. The display system as described in claim 5, characterized in that, The required total current multiplied by the total equivalent impedance, plus the voltage drop across the micro LED, yields the power supply voltage.

7. The display system as described in claim 6, characterized in that, The total equivalent impedance includes the following series impedances: The impedance of the external conductor lies between the power input pad of the driver and the power output pad of the power management unit, which is used to provide the power supply voltage. The equivalent internal impedance of the power input pad of the driver; The equivalent internal impedance of the common power pad of the driver; and The impedance of the external conductor lies between the common power pad and the common node of the driver.

8. The display system as described in claim 4, characterized in that, During line scan or frame scan, the timing controller determines the total current required by the corresponding group of drivers based on the data signal, and determines the power supply voltage of the corresponding group of drivers based on the determined total current.

9. The display system as described in claim 3, characterized in that, Each group of drivers is grounded separately.

10. The display system as described in claim 3, characterized in that, All groups of drivers share a common ground.

11. The display system as claimed in claim 1, characterized in that, This drive contains: The first circuit activates at least one column of micro-light-emitting diodes at any given time; and The second circuit provides pulse width modulation data signals to the micro LEDs in the enabled column; The duty cycle of each pulse width modulation data signal is proportional to the brightness of the data provided to the display panel.

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