TWI889451B - Method of driving decoupled light-emitting display - Google Patents

Abstract

A method of driving a decoupled light-emitting display is disclosed. The decoupled light-emitting display includes a plurality of light-emitting units arranged in a (M*N) matrix. The plurality of light-emitting units include M rows of light-emitting units and N columns of light-emitting units, wherein M and N are positive integers greater than 1. The method of driving the decoupled light-emitting display includes the following steps: (a) sequentially driving the M rows of light-emitting units to emit light; and (b) when driving the i-th row of light-emitting units in the M rows of light-emitting units, driving N light-emitting units corresponding to the i-th column of light-emitting units to emit light in a time-sharing manner, wherein i=1~M.

Description

Driving method of decoupled luminescent display

The present invention relates to a decoupled luminescent display, and in particular to a driving method of the decoupled luminescent display.

Generally speaking, a conventional decoupled light emitting diode (DELED) driver is used to drive a decoupled light emitting diode (DELED) display, such as a mini-light emitting diode (Mini-LED) display panel.

Please refer to Figures 1 to 3. Figure 1 is a schematic diagram of driving a decoupled light-emitting display in the prior art. Figures 2A and 2B are schematic diagrams of a conventional decoupled light-emitting display LED die matrix driving method. Since the LED light-emitting unit matrix of the display panel has parasitic capacitances C1 to C48, a coupling path is generated. Under this structure, for the first row of light-emitting units ROW1, the capacitance seen by the first light-emitting unit D1 corresponding to the first channel ch1 and the forty-eighth light-emitting unit D48 corresponding to the forty-eighth channel ch48 will be different, which will result in different voltage waveforms and LED current integral areas, resulting in inconsistent light brightness of the first light-emitting unit D1 to the forty-eighth light-emitting unit D48 in the same row of light-emitting units.

As shown in FIG3 , it is assumed that the first display area A1 and the second display area A2 of the decoupled luminescent display DP display a picture with higher brightness and a picture with lower brightness respectively, wherein the first light emitting unit D1 to the forty-eighth light emitting unit D48 in the first display area A1 are all turned on, while in the second display area A2 only the first light emitting unit D1 is turned on and the second light emitting unit D2 to the forty-eighth light emitting unit D48 are all turned off. Although the first light emitting unit D1 in the first display area A1 and the second display area A2 are both turned on, since the slew rate of the output waveform of the first light emitting unit D1 in the first display area A1 is faster than the slew rate of the first light emitting unit D1 in the second display area A2, the first light emitting unit D1 in the first display area A1 will be turned on faster and brighter than the first light emitting unit D1 in the second display area A2, resulting in the problem of uneven display brightness in different display areas of the traditional decoupled light emitting display, which needs to be solved.

Therefore, the present invention proposes a driving method of a decoupled light emitting display to effectively solve the above problems encountered by the prior art.

A preferred specific embodiment of the present invention is a driving method of a decoupled luminescent display. In this embodiment, the decoupled luminescent display includes a plurality of luminescent units arranged in an (M*N) matrix. The plurality of luminescent units include M columns of luminescent units and N rows of luminescent units, where M and N are positive integers greater than 1. The driving method of the decoupled luminescent display includes the following steps: (a) driving the M columns of luminescent units to emit light in sequence; and (b) when driving the i-th column of luminescent units in the M columns of luminescent units, driving the N luminescent units corresponding to the i-th column of luminescent units to emit light in a time-sharing manner, where i=1~M.

In one embodiment, step (b) further includes: (b1) driving at least one of the N light-emitting units to emit light within a first time; and (b2) driving at least one other light-emitting unit of the N light-emitting units that is different from the at least one light-emitting unit to emit light within a second time.

In one embodiment, the first time and the second time are regularly offset from each other.

In one embodiment, the first time and the second time are irregularly (randomly) offset from each other.

In one embodiment, the other light-emitting units among the N light-emitting units that are different from the at least one light-emitting unit are pre-turned on to compensate for the first time, so that the other light-emitting units do not emit light; and the other light-emitting units among the N light-emitting units that are different from the at least one light-emitting unit are pre-turned on to compensate for the second time, so that the other light-emitting units do not emit light.

In one embodiment, the decoupled luminescent display further includes N switches, which are respectively coupled to the N luminescent units, and step (b) further includes: turning on the N switches in a time-sharing manner so that the N luminescent units emit light in a time-sharing manner.

In one embodiment, step (b) further includes: (b1) providing a pulse width modulation signal to turn on at least one of the N switches within a first time, so that at least one light-emitting unit coupled to the at least one switch emits light; and (b2) providing a pulse width modulation signal to turn on at least one other switch of the N switches that is different from the at least one switch within a second time, so that at least one other light-emitting unit coupled to the at least one other switch emits light.

In one embodiment, the first time and the second time are regularly offset from each other.

In one embodiment, the first time and the second time are irregularly (randomly) offset from each other.

In one embodiment, a virtual pulse width modulation signal is also provided to other switches of the N switches other than the at least one switch for pre-opening compensation during the first time, so that other light-emitting units coupled to the other switches do not emit light, and the pulse width of the virtual pulse width modulation signal is smaller than the pulse width of the pulse width modulation signal.

In one embodiment, a virtual pulse width modulation signal is also provided to other switches of the N switches that are different from the other at least one switch for pre-opening compensation during the second time, so that other light-emitting units coupled to the other switches do not emit light, and the pulse width of the virtual pulse width modulation signal is smaller than the pulse width of the pulse width modulation signal.

Compared with the prior art, the driving method of the decoupled luminescent display proposed by the present invention drives different parts of the luminescent units corresponding to the column of luminescent units to emit light in a time-sharing manner during the period of driving any column of luminescent units of the decoupled luminescent display, and pre-turns on and compensates other luminescent units of the column of luminescent units so that they do not emit light, so that the display brightness of different display areas of the decoupled luminescent display is uniform, thereby effectively solving the problem of uneven panel brightness caused by parasitic capacitance.

A preferred embodiment of the present invention is a driving method of a decoupled light emitting display. In this embodiment, the decoupled light emitting display may include a mini-light emitting diode (Mini-LED) display panel, which may include a plurality of light emitting units arranged in an (M*N) matrix. The plurality of light emitting units include M rows of light emitting units and N columns of light emitting units, wherein M and N are positive integers greater than 1, but not limited thereto.

Please refer to FIG. 4 , which is a flow chart of the driving method of the decoupled luminescent display in this embodiment. As shown in FIG. 4 , the driving method of the decoupled luminescent display includes the following steps:

Step S10: driving the M rows of light-emitting units to emit light in sequence; and

Step S12: when driving the i-th column of the M columns of light-emitting units, N light-emitting units corresponding to the i-th column of light-emitting units are driven to emit light in a time-sharing manner, where i=1-M.

In practical applications, step S12 at least includes: driving at least one of the N light-emitting units to emit light within a first time; and driving at least one other light-emitting unit of the N light-emitting units that is different from the at least one light-emitting unit to emit light within a second time.

For example, assuming that i=1 and the first row of light-emitting cells includes the first to the forty-eighth light-emitting cells, the driving method of the present invention can drive the first to the forty-eighth light-emitting cells in the first row of light-emitting cells to emit light in a time-divided manner during the period of driving the first row of light-emitting cells, such as driving the first light-emitting cell to emit light in a first time, driving the second light-emitting cell to emit light in a second time, driving the third light-emitting cell to emit light in a third time... a regular driving operation, or driving the fourth light-emitting cell to emit light in the first time, driving the first light-emitting cell to emit light in the second time, driving the second light-emitting cell to emit light in a third time... an irregular (random) driving operation, but not limited to this.

As shown in FIG5 , the j-th column of light-emitting units and the i-th column of light-emitting units in the M columns of light-emitting units correspond to the first display area A1 and the second display area A2 of the decoupled light-emitting display DP, respectively, wherein the first display area A1 and the second display area A2 are adjacent to each other and the brightness of the picture displayed in the first display area A1 is greater than the brightness of the picture displayed in the second display area A2. For example, the second column of light-emitting units and the first column of light-emitting units correspond to the first display area A1 and the second display area A2 of the decoupled light-emitting display DP, respectively, but not limited thereto.

Next, please refer to Figures 6A to 6F. Figure 6A is a schematic diagram showing that the first display area A1 of the decoupled luminescent display DP is driven by the decoupled luminescent display driving method of the present invention. Figures 6B to 6F are schematic diagrams showing that the second display area A2 of the decoupled luminescent display DP is driven by the decoupled luminescent display driving method of the present invention.

As shown in FIG6A , taking the first scan S1 as an example, when the first display area A1 of the decoupled luminescent display DP is driven by the driving method of the present invention, the driving method of the present invention drives the first light emitting unit D1 to the forty-eighth light emitting unit D48 in the second column of light emitting units corresponding to the first display area A1 to emit light normally.

For example, the driving method of the present invention can provide a higher voltage to the first light emitting unit D1 to the forty-eighth light emitting unit D48 in the second row of light emitting units corresponding to the first display area A1, so that the cross-voltage of the first light emitting unit D1 to the forty-eighth light emitting unit D48 is greater than or equal to its forward voltage and can emit light normally, but not limited to this.

As shown in FIG6B , taking the first scan S1 as an example, when the second display area A2 of the decoupled light-emitting display DP is driven using the driving method of the present invention, the driving method of the present invention only drives the first light-emitting unit D1 in the first column of light-emitting units corresponding to the second display area A2 to emit light normally without driving the second light-emitting unit D2 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units.

For example, the driving method of the present invention may only provide a higher voltage to the first light emitting unit D1 in the first row of light emitting units corresponding to the second display area A2, so that the voltage across the first light emitting unit D1 is greater than or equal to its forward voltage and can emit light normally, but the present invention is not limited thereto.

As shown in FIG6C , when the second display area A2 of the decoupled luminescent display DP is driven by the driving method of the present invention, the first scan S1 to the forty-eighth scan S48 can adopt regular sequential time-sharing scanning operations. During the first scan S1, the driving method of the present invention drives the first light-emitting unit D1 in the first column of light-emitting units corresponding to the second display area A2 to emit light without driving the second light-emitting unit D2 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units to emit light; during the second scan S2, the driving method of the present invention drives the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2 to emit light without driving the second light-emitting unit D2 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units to emit light. The first light-emitting unit D1 and the third light-emitting unit D3 to the forty-eighth light-emitting unit D48 emit light; during the third scan S3, the driving method of the present invention drives the third light-emitting unit D3 in the first column of light-emitting units corresponding to the second display area A2 to emit light without driving the first light-emitting unit D1, the second light-emitting unit D2 and the fourth light-emitting unit D4 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units to emit light; the rest can be deduced from this and will not be elaborated here.

For example, during the first scan S1, the driving method of the present invention may only provide a higher voltage to the first light-emitting unit D1 in the first column of light-emitting units corresponding to the second display area A2, so that the cross-voltage of the first light-emitting unit D1 is greater than or equal to its forward voltage and can emit light normally; during the second scan S2, the driving method of the present invention may only provide a higher voltage to the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2, so that the cross-voltage of the second light-emitting unit D2 is greater than or equal to its forward voltage and can emit light normally; the rest can be deduced from this and will not be elaborated here.

As shown in FIG. 6D , when the second display area A2 of the decoupled luminescent display DP is driven by the driving method of the present invention, the first scan S1 to the forty-eighth scan S48 may adopt an irregular random time-sharing scanning operation. During the first scanning S1, the driving method of the present invention drives the fourth light-emitting unit D4 in the first column of light-emitting units corresponding to the second display area A2 to emit light without driving the first light-emitting unit D1 to the third light-emitting unit D3 and the fifth light-emitting unit D5 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units to emit light; during the second scanning S2, the driving method of the present invention drives the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2 to emit light without driving the first light-emitting unit D1 and the third light-emitting unit D3 to the forty-eighth light-emitting unit D4 in the first column of light-emitting units. 8 emits light; during the third scanning S3, the driving method of the present invention drives the forty-eighth light-emitting unit D48 in the first column of light-emitting units corresponding to the second display area A2 to emit light instead of driving the first light-emitting unit D1 to the forty-seventh light-emitting unit D47 in the first column of light-emitting units to emit light; during the fourth scanning S4, the driving method of the present invention drives the first light-emitting unit D1 in the first column of light-emitting units corresponding to the second display area A2 to emit light instead of driving the second light-emitting unit D2 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units to emit light; the rest can be deduced from this and will not be elaborated here.

For example, during the first scanning period S1, the driving method of the present invention may only provide a higher voltage to the fourth light-emitting unit D4 in the first column of light-emitting units corresponding to the second display area A2, so that the cross-voltage of the fourth light-emitting unit D4 is greater than or equal to its forward voltage and can emit light normally; during the second scanning period S2, the driving method of the present invention may only provide a higher voltage to the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2, so that the cross-voltage of the second light-emitting unit D2 is greater than or equal to its forward voltage and can emit light normally; during the third scanning period S3, the driving method of the present invention may only provide a higher voltage to the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2, so that the cross-voltage of the second light-emitting unit D2 is greater than or equal to its forward voltage and can emit light normally. During the fourth scanning period S4, the driving method of the present invention may only provide a higher voltage to the forty-eighth light-emitting unit D48 in the first column of light-emitting units corresponding to the second display area A2, so that the cross-voltage of the forty-eighth light-emitting unit D48 is greater than or equal to its forward voltage and can emit light normally; during the fourth scanning period S4, the driving method of the present invention may only provide a higher voltage to the first light-emitting unit D1 in the first column of light-emitting units corresponding to the second display area A2, so that the cross-voltage of the first light-emitting unit D1 is greater than or equal to its forward voltage and can emit light normally; the rest can be deduced from this and will not be elaborated here.

As shown in FIG. 6E , when the second display area A2 of the decoupled luminescent display DP is driven by the driving method of the present invention, the first scan S1 to the forty-eighth scan S48 may adopt regular sequential time-sharing scanning combined with a pre-opening compensation operation. During the first scanning S1, the driving method of the present invention drives the first light-emitting unit D1 in the first column of light-emitting units corresponding to the second display area A2 to emit light and pre-turns on and compensates the second light-emitting unit D2 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units, so that the second light-emitting unit D2 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units do not emit light; during the second scanning S2, the driving method of the present invention drives the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2 to emit light and pre-turns on and compensates the first light-emitting unit D1 and the third light-emitting unit D3 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units, The first light emitting cell D1 and the third light emitting cell D3 to the forty-eighth light emitting cell D48 in the first column of light emitting cells do not emit light; during the third scan S3, the driving method of the present invention drives the third light emitting cell D3 in the first column of light emitting cells corresponding to the second display area A2 to emit light and pre-compensates the first light emitting cell D1, the second light emitting cell D2 and the fourth light emitting cell D4 to the forty-eighth light emitting cell D48 in the first column of light emitting cells, so that the first light emitting cell D1, the second light emitting cell D2 and the fourth light emitting cell D4 to the forty-eighth light emitting cell D48 in the first column of light emitting cells do not emit light; the rest can be deduced from this and will not be elaborated here.

For example, during the first scanning S1, the driving method of the present invention can provide a higher voltage to the first light-emitting unit D1 in the first row of light-emitting units corresponding to the second display area A2 and provide a lower voltage to the second light-emitting unit D2 to the forty-eighth light-emitting unit D48 in the first row of light-emitting units, so that the cross-voltage of the first light-emitting unit D1 is greater than or equal to its forward voltage and can emit light normally, and the cross-voltage of the second light-emitting unit D2 to the forty-eighth light-emitting unit D48 is less than its cut-in voltage. voltage) but does not emit light; during the second scanning period S2, the driving method of the present invention can provide a higher voltage to the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2, and provide a lower voltage to the first light-emitting unit D1 and the third light-emitting unit D3 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units, so that the cross-voltage of the second light-emitting unit D2 is greater than or equal to its forward voltage and can emit light normally, and the cross-voltage of the first light-emitting unit D1 and the third light-emitting unit D3 to the forty-eighth light-emitting unit D48 is less than its cut-in voltage and does not emit light; the rest can be deduced from this and will not be elaborated here.

As shown in FIG. 6F , when the second display area A2 of the decoupled luminescent display DP is driven by the driving method of the present invention, the first scan S1 to the forty-eighth scan S48 may adopt irregular random time-sharing scanning combined with pre-opening compensation operation. During the first scanning S1, the driving method of the present invention drives the fourth light-emitting unit D4 in the first column of light-emitting units corresponding to the second display area A2 to emit light and pre-opens and compensates the first light-emitting unit D1 to the third light-emitting unit D3 and the fifth light-emitting unit D5 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units, so that the first light-emitting unit D1 to the third light-emitting unit D3 and the fifth light-emitting unit D5 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units do not emit light; during the second scanning S2, the driving method of the present invention drives the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2 to emit light and pre-opens and compensates the first column of light-emitting units. The first light emitting cell D1 and the third light emitting cell D3 to the forty-eighth light emitting cell D48 in the unit make the first light emitting cell D1 and the third light emitting cell D3 to the forty-eighth light emitting cell D48 in the first column of light emitting cells not emit light; during the third scanning S3, the driving method of the present invention drives the forty-eighth light emitting cell D48 in the first column of light emitting cells corresponding to the second display area A2 to emit light and pre-compensates the first light emitting cell D1 to the forty-seventh light emitting cell D47 in the first column of light emitting cells, so that the first light emitting cell D1 to the forty-seventh light emitting cell D47 in the first column of light emitting cells do not emit light; the rest can be deduced from this and will not be elaborated here.

For example, during the first scanning S1, the driving method of the present invention can provide a higher voltage to the fourth light-emitting unit D4 in the first row of light-emitting units corresponding to the second display area A2, and provide a lower voltage to the first light-emitting unit D1 to the third light-emitting unit D3 and the fifth light-emitting unit D5 to the forty-eighth light-emitting unit D48 in the first row of light-emitting units, so that the cross-voltage of the fourth light-emitting unit D4 is greater than or equal to its forward voltage and can emit light normally, and the cross-voltage of the first light-emitting unit D1 to the third light-emitting unit D3 and the fifth light-emitting unit D5 to the forty-eighth light-emitting unit D48 is less than its cut-in voltage and No light is emitted; during the second scanning S2, the driving method of the present invention can provide a higher voltage to the second light-emitting unit D2 in the first column of light-emitting units corresponding to the second display area A2, and provide a lower voltage to the first light-emitting unit D1 and the third light-emitting unit D3 to the forty-eighth light-emitting unit D48 in the first column of light-emitting units, so that the cross-voltage of the second light-emitting unit D2 is greater than or equal to its forward voltage and can emit light normally, and the cross-voltage of the first light-emitting unit D1 and the third light-emitting unit D3 to the forty-eighth light-emitting unit D48 is less than its cut-in voltage and does not emit light; the rest can be deduced from this and will not be elaborated here.

Please refer to FIG. 7 , which shows a flow chart assuming that the decoupled light-emitting display further includes N switches and the N switches are respectively coupled to the N light-emitting units in the first row of light-emitting units, and step S12 in FIG. 4 further includes steps S120 and S122. As shown in FIG. 7 , step S12 in FIG. 4 may further include the following steps:

Step S120: providing a pulse width modulation signal to at least one switch of the N switches within a first time, so that the at least one switch is turned on and at least one light-emitting unit coupled to the at least one switch emits light; and

Step S122: providing a pulse width modulation signal to at least one switch other than the at least one switch among the N switches within a second time, so as to turn on the at least one switch and enable at least one other light-emitting unit coupled to the at least one switch to emit light.

In practical applications, the first cross-voltage of the at least one light-emitting unit in step S120 is greater than or equal to its forward voltage and can emit light normally, and a virtual pulse width modulation signal can be provided to other switches of the N switches that are different from the at least one switch for pre-opening compensation within the first time, so that the second cross-voltage of other light-emitting units coupled to the other switches is less than its cut-in voltage and does not emit light. light; in step S122, the first cross-voltage of the at least one other light-emitting unit is greater than or equal to its forward voltage and can emit light normally, and within the second time, a virtual pulse width modulation signal can also be provided to other switches of the N switches that are different from the at least one other switch for pre-opening compensation, so that the second cross-voltage of other light-emitting units coupled to the other switches is less than their cut-in voltage and does not emit light.

In this embodiment, the pulse width of the virtual pulse width modulated signal is smaller than the pulse width of the pulse width modulated signal and the second cross voltage is smaller than the first cross voltage. For example, as shown in Figure 8, the driving method of the present invention provides a pulse width modulation signal PWM1 to the first switch coupled to the first light-emitting unit D1 and provides a virtual pulse width modulation signal PWM2 to the second switch to the forty-eighth switch coupled to the second light-emitting unit D2 to the forty-eighth light-emitting unit D48, wherein the pulse width W2 of the virtual pulse width modulation signal PWM2 is smaller than the pulse width W1 of the pulse width modulation signal PWM1, that is, the conduction time of the second switch to the forty-eighth switch is smaller than the conduction time of the first switch.

For example, when the first switch is turned on by the pulse width modulation signal PWM1, the first light-emitting unit D1 will have a higher first cross-voltage AVDD-V(ch1) (e.g., greater than or equal to its forward voltage) and emit light, as shown in FIG9A. When the second switch is pre-opened by the virtual pulse width modulation signal PWM2, the second light-emitting unit D2 will have a lower second cross-voltage AVDD-V(ch2) (e.g., less than its cut-in voltage) and will not emit light, as shown in FIG9B.

Similarly, when the third to forty-eighth switches are pre-opened by the virtual pulse width modulation signal, the third to forty-eighth light-emitting units D3 to D48 will also have a lower cross-voltage (eg, less than the cut-in voltage) and will not emit light.

In practical applications, the length of the conduction time T1 of the second switch pre-opened by the virtual pulse width modulation signal PWM2 can be adjusted according to the effect after compensation. If the conduction time T1 of the second switch pre-opened is increased, the second cross voltage AVDD-V (ch2) of the second light-emitting unit D2 will decrease and approach its cut-in voltage. Since the second light-emitting unit D2 may have a slight light leakage phenomenon when the second cross voltage AVDD-V (ch2) of the second light-emitting unit D2 is equal to the cut-in voltage, its conduction time T1 should not be increased at this time. As for the third light-emitting unit D3 to the forty-eighth light-emitting unit D48, the same can be inferred and will not be elaborated here.

It should be noted that, although the above embodiment is described using the first light emitting unit D1 to the forty-eighth light emitting unit D48 in the first row of light emitting units, the situation is also applicable to other rows of light emitting units in the decoupled light emitting display, which will not be elaborated here, and the number of light emitting units in each row of the decoupled light emitting display can also be determined according to actual needs, and is not limited to this.

Compared with the prior art, the driving method of the decoupled luminescent display proposed by the present invention drives different parts of the luminescent units corresponding to the column of luminescent units to emit light in a time-sharing manner during the period of driving any column of luminescent units of the decoupled luminescent display, and pre-turns on and compensates other luminescent units of the column of luminescent units so that they do not emit light, so that the display brightness of different display areas of the decoupled luminescent display is uniform, thereby effectively solving the problem of uneven panel brightness caused by parasitic capacitance.

PS…power switch AVDD…operating voltage ROW1…first row of light-emitting units ch1~ch48…first channel~48th channel D1~D48…first light-emitting unit~48th light-emitting unit C1~C48…first parasitic capacitor~48th parasitic capacitor SW1~SW48…first switch~48th switch S1~S64…first scan~48th scan GND…ground terminal DP…decoupled light-emitting display A1…first display area A2…second display area V(Column)…row voltage I(Column)…row current S10…step S12…step S120…step S122…step PWM1…pulse width modulation signal PWM2…Virtual pulse width modulation signal W1~W2…Pulse width AVDD-V(ch1)…First cross voltage AVDD-V(ch2)…Second cross voltage T1…On time

FIG. 1 is a schematic diagram showing a driving decoupled luminescent display in the prior art.

FIG. 2A and FIG. 2B are schematic diagrams showing a conventional LED die matrix driving method of a decoupled light emitting display.

FIG. 3 is a schematic diagram showing that the voltage waveforms of the first light-emitting units in the first display area and the second display area when the first light-emitting units are turned on are different and the LED current integrated areas are also different in the prior art.

FIG. 4 is a flow chart showing a method for driving a decoupled light emitting display in a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram showing a first display area and a second display area of a decoupled light emitting display.

FIG. 6A is a schematic diagram showing that the first display area of the decoupled luminescent display is driven by the driving method of the decoupled luminescent display of the present invention.

FIG. 6B to FIG. 6F are schematic diagrams respectively showing the second display area of the decoupled luminescent display being driven by the driving method of the decoupled luminescent display of the present invention.

FIG. 7 is a flow chart showing that step S12 in FIG. 4 further includes steps S120 and S122 .

8 is a schematic diagram showing that the driving method of the decoupled light-emitting display of the present invention drives the first light-emitting unit in the same column of light-emitting units to emit light normally and performs pre-on compensation on the other light-emitting units (the second light-emitting unit to the forty-eighth light-emitting unit) in the same column so that they do not emit light.

FIG. 9A and FIG. 9B are schematic diagrams respectively showing that the first light emitting unit has a larger first voltage and emits light, and the second light emitting unit has a smaller second voltage and does not emit light.

S10: Step

S12: Step

Claims (9)

A driving method for a decoupled luminescent display, the decoupled luminescent display comprising a plurality of luminescent units arranged in an (M*N) matrix, the plurality of luminescent units comprising M rows of luminescent units and N columns of luminescent units, wherein M and N are positive integers greater than 1, the driving method comprising the following steps: (a) driving the M rows of luminescent units to emit light in sequence; and (b) when driving the i-th row of luminescent units in the M rows of luminescent units, driving N luminescent units corresponding to the i-th row of luminescent units to emit light in a time-division manner, wherein i=1~M; wherein the decoupled luminescent display further comprises N switches, respectively coupled to the N luminescent units, and step (b) further turns on (turns on) the N luminescent units in a time-division manner. on) the N switches so that the N light-emitting units emit light in a time-sharing manner, and step (b) further includes: (b1) providing a pulse width modulation signal to turn on at least one switch of the N switches within a first time so that at least one light-emitting unit coupled to the at least one switch emits light; and (b2) providing the pulse width modulation signal to turn on at least one other switch of the N switches different from the at least one switch within a second time so that at least one other light-emitting unit coupled to the at least one other switch emits light. A driving method as described in claim 1, wherein step (b) further includes: (b1) driving at least one of the N light-emitting units to emit light within a first time; and (b2) driving at least one other light-emitting unit among the N light-emitting units that is different from the at least one light-emitting unit to emit light within a second time. A driving method as described in claim 2, wherein the first time and the second time are regularly offset from each other. The driving method as described in claim 2, wherein the first time and the second time are irregularly (randomly) offset from each other. A driving method as described in claim 2, wherein in the first time, other light-emitting units among the N light-emitting units that are different from the at least one light-emitting unit are pre-turned on to compensate, so that the other light-emitting units do not emit light; and in the second time, other light-emitting units among the N light-emitting units that are different from the at least one other light-emitting unit are pre-turned on to compensate, so that the other light-emitting units do not emit light. A driving method as described in claim 1, wherein the first time and the second time are regularly offset from each other. The driving method as described in claim 1, wherein the first time and the second time are irregularly (randomly) offset from each other. A driving method as described in claim 1, wherein a virtual pulse width modulation signal is also provided to other switches among the N switches that are different from the at least one switch for pre-opening compensation during the first time, so that other light-emitting units coupled to the other switches do not emit light, and the pulse width of the virtual pulse width modulation signal is smaller than the pulse width of the pulse width modulation signal. A driving method as described in claim 1, wherein a virtual pulse width modulation signal is also provided to other switches among the N switches that are different from the other at least one switch for pre-opening compensation during the second time, so that other light-emitting units coupled to the other switches do not emit light, and the pulse width of the virtual pulse width modulation signal is smaller than the pulse width of the pulse width modulation signal.

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