TWI698856B - Display device and display method - Google Patents

Abstract

A display method suitable for a display device. A display panel of the display device includes several pixel circuits. A first pixel circuit of the several pixel circuits is located above an ambient light sensor. The display method includes the following procedures: controlling the first pixel circuit such that the first pixel circuit does not illuminate in a first time interval of the update time interval of the first pixel circuit; controlling the ambient light sensor to perform light sensing during the first time interval of the first pixel circuit to obtain ambient light intensity; and adjusting a display brightness of the display panel according to the ambient light intensity.

Description

Display device and display method

This disclosure relates to a display device, in particular to a display device in which an ambient light sensor is arranged in the display area of the display panel.

In the prior art, in the application of electronic products, an ambient light sensor (ALS) is integrated in the non-display area outside the panel to sense the ambient illuminance. However, if the ambient light sensor can be arranged behind the display area of the display panel, the screen-to-body ratio of the display can be greatly increased.

One aspect of this case is to provide a display device. The display device includes a display panel, an ambient light sensor and a processor. The display panel includes multiple pixel circuits. The first pixel circuit of the plurality of pixel circuits includes a first light emitting diode. The first light emitting diode is non-conductive in the first time interval of the update time interval of the first pixel circuit. The ambient light sensor is located above the first pixel circuit and used for light sensing in the first time interval of the first pixel circuit to obtain the ambient light intensity. The processor is used for adjusting the display brightness of the display panel according to the ambient light intensity.

Another aspect of this case is to provide a display method. This display method is suitable for display devices. The display panel of the display device includes a plurality of pixel circuits. The first pixel circuit of the plurality of pixel circuits is located above the ambient light sensor. The display method includes the following steps: controlling the first pixel circuit so that the first pixel circuit does not light up in the first time interval of the update time interval of the first pixel circuit; controlling the ambient light sensor to be on the first picture The light sensing is performed in the first time interval of the pixel circuit to obtain the ambient light intensity; and the display brightness of the display panel is adjusted according to the ambient light intensity.

Therefore, according to the technical aspect of the present application, the implementation of the present application provides a display device to integrate the display area with the ambient light sensor. In the embodiment of this case, the ambient light sensor is arranged behind the display area of the display panel, which can greatly increase the screen-to-body ratio of the display. In addition, by adjusting the lighting time interval of the light-emitting diode of the pixel circuit, the influence of the display screen on the ambient light sensor can be reduced.

100‧‧‧Display device

110‧‧‧Display Panel

115‧‧‧Source drive circuit

125‧‧‧Gate drive circuit

P, P11 to PMN, PS11 to PS22‧‧‧Pixel circuit

G1 to GM‧‧‧Gate line

D1 to DN‧‧‧Data line

130‧‧‧Controller

150‧‧‧Ambient Light Sensor

170‧‧‧Processor

SW‧‧‧Sensing window

W‧‧‧Window width

TA to TC‧‧‧Switch

OLED‧‧‧Light Emitting Diode

N1、N2‧‧‧node

OVSS, OVSS‧‧‧Voltage source

C‧‧‧Capacitor

300‧‧‧Waveform

SG, SEM‧‧‧Drive wave

TFrame, TP1, TP2‧‧‧Time interval

X‧‧‧direction

Region1, Region2‧‧‧Region

t1 to t6‧‧‧time point

TF1, TF2, STF‧‧‧Time interval

TAls, Tbuffer1, Tbuffer2‧‧‧Time interval

Sync‧‧‧Sync signal

X1, X2‧‧‧Coordinates

400, 600‧‧‧ schematic diagram

710‧‧‧Logo

720A to 720E‧‧‧area

800‧‧‧Display method

Steps S810 to S850‧‧‧

In order to make the above and other purposes, features, advantages and embodiments of the disclosure document more obvious and understandable, the description of the accompanying drawings is as follows: Figure 1A is a schematic diagram of a display device drawn according to some embodiments of the present application; FIG. 1B is a side view of a display device according to some embodiments of this case; FIG. 2 is a schematic diagram of a pixel circuit according to some embodiments of this case; FIG. 3 is an operation waveform diagram of a display device according to some embodiments of the present invention; FIG. 4 is a schematic diagram of the relationship between time and position of a display panel during operation according to some embodiments of the present invention; Figure 5 is a part of the schematic diagram in Figure 4 drawn according to some embodiments of the present case; Figure 6 is a schematic diagram showing part of the update situation drawn according to some embodiments of the present case; Figure 7 is based on the present case A schematic diagram of the display panel shown in some embodiments; FIG. 8 is a schematic diagram of a display method according to some embodiments of the present application.

The embodiments of the present disclosure will be described below in conjunction with related drawings. In the drawings, the same reference numerals indicate the same or similar elements or method flows.

Please refer to Figure 1A. FIG. 1A is a schematic diagram of a display device 100 according to some embodiments of the present application. As shown in FIG. 1A, the display device 100 includes a display panel 110, a source driving circuit 115, a gate driving circuit 125, a controller 130, an ambient light sensor 150, a processor 170, gate lines G1 to GM, Data line D1 to DN. The display panel 110 includes a plurality of pixel circuits P11 to PMN, forming an M×N pixel array.

In terms of connection, the pixel circuits P11 to PMN are respectively coupled One of the multiple gate lines G1 to GM and one of the multiple data lines D1 to DN. The gate lines G1 to GM are coupled to the gate driving circuit 125, and the data lines D1 to DN are coupled to the source driving circuit 115. The gate driving circuit 125 and the source driving circuit 115 are coupled to the controller 130. The controller 130 is coupled to the ambient light sensor 150 and the processor 170. The ambient light sensor 150 is coupled to the processor 170.

As shown in FIG. 1A, the ambient light sensor 150 is disposed in the display area of the display panel 110, that is, the ambient light sensor 150 overlaps the display panel 110. In detail, the ambient light sensor 150 is located below a part of the pixel circuits among the pixel circuits P11 to PMN. For example, the ambient light sensor 150 in Figure 1A is located below the pixel circuits PS11, PS12, PS21, and PS22.

In addition, the display panel 110 includes a sensing window SW. The sensing window SW is located in the upper area of the ambient light sensor 150 to enable the ambient light sensor 150 to perform sensing.

It should be noted that the above-mentioned pixel circuits PS11, PS12, PS21, PS22 refer to part of the pixel circuits of the pixel circuits P11 to PMN, and the ambient light sensor 150 shown in Figure 1A The setting position of, and the arrangement and number of pixel circuits under the ambient light sensor 150, the number of gate lines G1 to GM and data lines D1 to DN in the display device 100 are only for illustrative purposes. The implementation is not limited to this.

Please refer to Figure 1B. FIG. 1B is a side view of a display device 100 according to some embodiments of the present application. As shown in FIG. 1B, the display panel 110 is located above the ambient light sensor 150, and the ambient light sensor The detector 150 can sense the ambient light above the display panel 110.

Please refer to Figure 2. FIG. 2 is a schematic diagram of a pixel circuit P drawn according to some embodiments of the present application. The pixel circuit P can be used to represent the pixel circuits P11 to PMN as shown in FIG. 1A. As shown in Figure 2, the pixel circuit P includes switches TA to TC, a capacitor C, and a light-emitting diode OLED. The pixel circuit P shown in FIG. 2 is only for illustrative purposes, and the implementation of this case is not limited to this.

In addition, in practice, the switches TA to TC can be implemented by P-type low temperature polysilicon thin film transistors, but this embodiment is not limited to this. For example, the switches TA to TC can also be implemented with P-type amorphous silicon thin film transistors. In some embodiments, N-type thin film transistors can also be used for implementation, and the present invention does not limit the type of transistors used.

Please refer to Figure 3. FIG. 3 is an operation waveform diagram 300 of a display device 100 according to some embodiments of the present application. The driving wave SG in Fig. 3 is a driving wave input to the multiple gate lines G1 to GM as depicted in Fig. 1A, and the driving wave SEM is input to the switch T2 as depicted in Fig. 2 The drive wave of the control end.

Please refer back to Figure 2. In terms of connection, the control terminal of the switch TA is coupled to one of the multiple gate lines G1 to GM, and the first terminal of the switch TA is coupled to one of the multiple data lines D1 to DN to receive the data signal Data , The second end of the switch TA is coupled to the node N1. The control terminal of the switch TC is coupled to the node N1, the first terminal of the switch TC is coupled to the voltage source OVSS, and the second terminal of the switch TC is coupled to the second node N2. The control terminal of the switch TB is used to Receiving the driving wave SEM as shown in FIG. 3, the first terminal of the switch TB is coupled to the second node N2, and the second terminal of the switch TB is coupled to the voltage source OVDD. The first end of the capacitor C is coupled to the node N1, and the second end of the capacitor C is coupled to the node N2.

The pixel circuit P shown in FIG. 2 is updated according to the driving wave SG in FIG. 3. In detail, when the switch TA in FIG. 2 is turned on according to the driving wave SG, the data signal Data is transmitted to the capacitor C through the first terminal of the switch TA. At this time, the data signal Data stored in the pixel circuit P is updated.

As shown in FIG. 3, the update time interval TFrame of one frame of the pixel circuit P includes a first time interval TP1 and a second time interval TP2. In the first time interval TP1, the switch TB in Figure 2 is not turned on. At this time, the light emitting diode OLED in Figure 2 is not conducting. In the second time interval TP2, the switch TB in Figure 2 is turned on. At this time, the light-emitting diode OLED in Figure 2 is turned on. As a result, the light-emitting diode OLED in Figure 2 does not light up during the first time interval TP1, and light up during the second time interval TP2.

Please refer to Figure 1A and Figure 3 together. In some embodiments, the ambient light sensor 150 in FIG. 1A performs light sensing in the first time interval TP1 depicted in FIG. 3 to obtain the ambient light intensity.

Please refer to Figure 4. FIG. 4 is a schematic diagram 400 of the relationship between time and position of the display panel 110 during operation according to some embodiments of the present application. Please also refer to Fig. 1A. As shown in Fig. 1A, the X direction refers to the direction parallel to the data lines D1 to DN. X1 and X2 refer to the X coordinates of the position of the sensing window SW in the X direction of the display panel 110. As in section 4 As shown in the figure, when each of the plurality of pixel circuits P11 to PMN does not light up in the first time interval T1 in the update time interval TFrame of one frame, because the plurality of gate lines G1 to GM transfer gate There will be a time difference between the time points of the extreme pulse wave to a part of the plurality of pixel circuits P11 to PMN. Therefore, the relationship between time and position of the display panel 110 during operation will appear as shown in FIG. 4.

In Figure 4, Region1 refers to the area where the light emitting diode OLED does not light up, and Region2 refers to the area where the light emitting diode OLED lightens. In detail, from the time point t1 to the time point t3, the light emitting diodes OLEDs of the pixel circuits P11 to PMN in the part where the X coordinate is X1 are not turned on. From time t2 to time t4, the light emitting diodes OLEDs of the pixel circuits P11 to PMN in the part where the X coordinate is X2 are not turned on.

Please refer to Figure 5. FIG. 5 is a part of the schematic diagram 400 in FIG. 4 according to some embodiments of the present application. Please also refer to Figure 1A. Assume that the X coordinate of the pixel circuits PS11 and PS12 in Figure 1A is X1, and the X coordinate of the pixel circuits PS21 and PS22 is X2. During the time interval TF1 from time point t1 to time point t3, the pixel circuit at coordinate X1 is not conducting, and during the time interval TF2 from time point t2 to time point t4, the pixel circuit at coordinate X2 is not conducting . The sub-time interval STF where the time intervals TF1 and TF2 overlap is a time interval in which neither the pixel circuit at the coordinate X1 nor the pixel circuit at the coordinate X2 is turned on. In some embodiments, the ambient light sensor 150 (as shown in FIG. 1A) located between the coordinates X1 and X2 performs light sensing in the sub-time interval STF to reduce the exposure of the ambient light sensor 150 to the display panel. 110 influence.

As shown in Figure 5, in some embodiments, the sub-time zone The time STF includes the sensing time interval TA1s and the buffer time intervals Tbuffer1 and Tbuffer2. The buffer time interval Tbuffer1 is located before the sensing time interval TAls, and the buffer time interval Tbuffer2 is located after the sensing time interval TAls. The ambient light sensor 150 (as shown in FIG. 1A) performs sensing in the sensing time interval TAls. By setting the buffer time intervals Tbuffer1 and Tbuffer2, the ambient light sensor 150 can be prevented from being disturbed during sensing.

In some embodiments, the controller 130 in FIG. 1A is further used to transmit the synchronization signal Sync to the ambient light sensor 150 to enable the ambient light sensor 150 to perform light sensing. For example, the controller 130 may transmit the synchronization signal Sync to the ambient light sensor 150 in the sub-time interval STF to enable the ambient light sensor 150 to perform light sensing. Alternatively, the controller 130 may also transmit the synchronization signal Sync to the ambient light sensor 150 during the sensing time interval TAls to enable the ambient light sensor 150 to perform light sensing. Since the synchronization signal Sync may drift, by setting the buffer time interval Tbuffer1 and Tbuffer2, the influence caused by the drift of the synchronization signal Sync can be reduced.

In some embodiments, the controller 130 in Figure 1A is further used to calculate the shade according to the window width W of the sensing window SW, the length of the sub-time interval of the ambient light sensor 150, and the resolution of the display panel 110. The black duty ratio, and the length of the time interval TP1 as shown in FIG. 3 is adjusted according to the black-out duty ratio. It should be noted that the window width W shown in Figure 2 refers to the length of the sensing window SW in the X direction.

In some embodiments, the window width W can be expressed in units of the number of gate lines. For example, if the display panel 110 is in the X direction The pixel pitch of is 0.08 millimeters (mm), and the window width W is 0.48mm, the window width W can be expressed as the distance of 6 gate lines.

62 In some embodiments, the sensing time length can be expressed in units of the number of gate lines. For example, if the length of the sensing time interval of the ambient light sensor 150 is 3 ms (milliseconds), and the length of the front and back buffer time intervals is 1 ms (milliseconds) in total, then the sub-time of the ambient light sensor 150 can be calculated The length of the interval STP is 4 ms (milliseconds). If the update frequency of the display panel 110 is 45 Hz (Hertz) and there are a total of 340 gate lines, it can be calculated that the length of the sub-time interval STP expressed in units of the number of gate lines is 62 gate lines. The formula is as follows: 4÷(1÷45÷340)

62

In addition, the resolution can also be expressed in units of the number of gate lines. In this way, the blackout duty ratio can be calculated according to the following formula: blackout duty ratio=(sensing window width+sub-time interval)/resolution=(6+62)/340=20%

Next, the controller 130 in FIG. 1A controls the plurality of pixel circuits P11 to PMN according to the blackout duty ratio so that the plurality of pixel circuits P11 to PMN do not light up in the respective refresh time interval (TFrame) time interval TP1.

Please refer back to Figure 1A. In some embodiments, the ambient light sensor 150 transmits the measured ambient light intensity to the processor 170. The processor 170 determines the dimming coefficient according to the ambient light intensity, and transmits the bar light coefficient to the controller 130. The controller 130 adjusts the display brightness of the display panel 110 according to the bar light coefficient.

In some embodiments, since the controller 130 stores loops The location of the ambient light sensor 150 on the display panel 110, therefore, the controller 130 can transmit the synchronization signal Sync to the ambient light sensor 150, so that the ambient light sensor 150 is not in the pixel circuits PS11 to PS22. Sense when lit.

In some other embodiments, the processor 170 may control the plurality of pixel circuits P11 to PMN to be partially updated. In detail, the processor 170 can control the gate driving circuit 125 and the source driving circuit 115 so that the display panel 110 only updates the pixel circuits PS11 to PS22 located above the ambient light sensor 150. In addition, the processor 170 can also control the ambient light sensor 150 to sense when the pixel circuits PS11 to PS22 are not lit, without the need to transmit the synchronization signal Sync through the controller 130.

Please refer to Figure 1A and Figure 6 together. FIG. 6 is a schematic diagram 600 of a partial update situation according to some embodiments of the present application. In some embodiments, when the display device 110 (shown in Figure 1A) wants to perform light sensing and adjust the display screen, the processor 170 (shown in Figure 1A) may partially update the display panel 110 (such as The pixel circuits PS11 to PS22 above the ambient light sensor 150 (shown in Figure 1A) in Figure 1A), and control so that none of the pixel circuits PS11 to PS22 light up, that is, as in Figure 1A Figure 6 shows the update time interval of the black part. The time interval in which the black part is updated is the buffer time interval. The processor 170 controls the ambient light sensor 150 to perform light sensing in the detection time interval after the buffer time interval. After the ambient light sensor 150 finishes sensing, the detection time interval is the buffer time interval. Next, the processor 170 updates the screen part to turn on the light emitting diodes (OLED) of the pixel circuits PS11 to PS22 to display the screen. In this case, the ambient light The sensing time length of the sensor 150 is not limited by the blackout duty cycle. It should be noted that in some embodiments, the partially updated area is larger than the area of the ambient light sensor 150.

Please refer to Figure 7. FIG. 7 is a schematic diagram of the display panel 110 according to some embodiments of the present application. As shown in Figure 7, the display panel 110 includes a logo 710, and the ambient light sensor 150 (as shown in Figure 1A) can be placed under the logo 710, and the ambient light sensor 150 can be placed on the display panel 110 The area 720A. In this way, when the pixel circuit of the part that overlaps with the ambient light sensor 150 is updated in black and displayed as black, the user is less affected. In addition, the ambient light sensor 150 can also be arranged in the four corner areas 720B to 720E of the display panel 110, which can reduce the influence of the user when viewing the display screen.

In this way, even if the ambient light sensor 150 is arranged in the display area of the display panel 110, the ambient light sensor 150 performs light sensing in the time interval when the pixel circuit overlapping with the sensing window SW is not lit. Therefore, the ambient light sensor 150 will not be affected by the display screen of the display panel 110 during light sensing.

Please refer to Figure 8. FIG. 8 is a schematic diagram of a display method 800 according to some embodiments of the present application. As shown in FIG. 8, the display method 800 includes steps S810 to S850. For the convenience of description, the following will also refer to Figure 1A for description.

In step S810, the pixel circuit is controlled so that the pixel circuit does not light up in the first time interval of the update time interval. For example, in some embodiments, the controller 130 in FIG. 1A is based on that shown in FIG. 3 The operation waveform diagram 300 controls the pixel circuits P11 to PMN in Figure 1A so that the pixel circuits P11 to PMN are in the first time interval TP1 in the update time interval (TFrame) of one frame (as shown in Figure 3). ) Does not light up. In some other embodiments, the processor 170 in Figure 1A partially updates the display panel 110, that is, the processor 170 only updates the pixel circuits PS11 to PS22 that overlap with the ambient light sensor 150, so that the The pixel circuits PS11 to PS22 overlapped by the device 150 do not light up.

In step S830, the ambient light sensor is controlled to perform light sensing in the first time interval to obtain the ambient light intensity. For example, in some embodiments, the controller 130 in Figure 1A transmits a synchronization signal Sync (as shown in Figure 5) to the ambient light sensor 150, so that the ambient light sensor 150 is The light sensing is performed during the time interval when the circuits PS11 to PS22 are not lit. In other embodiments, the processor 170 in Figure 1A partially updates the pixel circuits PS11 to PS22 overlapping with the ambient light sensor 150 so that the pixel circuits PS11 to PS22 do not light up, and then controls the ambient light sensor. The detector 150 performs light sensing.

In step S850, the display brightness of the display panel is adjusted according to the ambient light intensity. For example, in some embodiments, the ambient light sensor 150 in FIG. 1A transmits the measured ambient light intensity to the processor 170. The processor 170 determines the dimming coefficient according to the ambient light intensity, and transmits the bar light coefficient to the controller 130. The controller 130 adjusts the display brightness of the display panel 110 according to the bar light coefficient.

To sum up, the embodiment of the present application provides a display device to integrate the display area with the ambient light sensor. Implementation of this case Among them, the ambient light sensor is arranged behind the display area of the display panel, which can greatly increase the screen-to-body ratio of the monitor. In addition, by adjusting the lighting time interval of the light-emitting diode of the pixel circuit, the influence of the display screen on the ambient light sensor can be reduced. In some embodiments, the display panel can be updated partially, so that the time for the ambient light sensor to perform light sensing is not affected by the update frequency of the display panel, and by combining the ambient light sensor with the logo or Set at the corner of the display panel to reduce the impact on the user when viewing the display screen.

Certain words are used in the specification and the scope of the patent application to refer to specific elements. However, those with ordinary knowledge in the technical field should understand that the same element may be called by different terms. The specification and the scope of the patent application do not use the difference in names as a way of distinguishing elements, but the difference in function of the elements as the basis for distinguishing. The "including" mentioned in the specification and the scope of the patent application is an open term, so it should be interpreted as "including but not limited to". In addition, "coupling" here includes any direct and indirect connection means. Therefore, if it is described in the text that the first element is coupled to the second element, it means that the first element can be directly connected to the second element through electrical connection, wireless transmission, optical transmission, or other signal connection methods, or through other elements or connections. The means is indirectly connected to the second element electrically or signally.

In addition, unless otherwise specified in the specification, any term in the singular case also includes the meaning of the plural case.

Although the content of this disclosure has been disclosed in the above manner, it is not used to limit the content of this disclosure. Anyone who is familiar with this technique will not depart from this disclosure. Various changes and modifications can be made within the spirit and scope of the content. Therefore, the protection scope of this disclosure shall be subject to the scope of the attached patent application.

800‧‧‧Display method

Steps S810 to S850‧‧‧

Claims (9)

A display device includes: a display panel including a plurality of pixel circuits, wherein a first pixel circuit of the pixel circuits includes a first light emitting diode, wherein the first light emitting diode is connected to the A first time interval in an update time interval of the first pixel circuit is not turned on; an ambient light sensor is located above the first pixel circuit for the first time of the first pixel circuit Light sensing in intervals to obtain an ambient light intensity; and a processor for adjusting the display brightness of the display panel according to the ambient light intensity; wherein a second pixel circuit of the pixel circuits includes a first pixel circuit Two light-emitting diodes, wherein the second light-emitting diode is non-conductive in a first time interval in an update time interval of the second pixel circuit, and the second pixel circuit is located in the ambient light sensor Above; wherein the first pixel circuit is coupled to a first gate line, the second pixel circuit is coupled to a second gate line; wherein the ambient light sensor is used for the first light emission Light sensing is performed for a sub-time interval in which neither the diode nor the second light-emitting diode conducts. Such as the display device of claim 1, wherein the sub-time interval includes a buffer time interval and a sensing time interval, and the ambient light sensor is further used for light sensing in the sensing time interval. For example, the display device of claim 1, further comprising: a controller for calculating a blackout based on the width of a sensing window, the length of the sub-time interval of the ambient light sensor, and a resolution of the display panel And controlling the length of the first time interval of the first pixel circuit and the first time interval of the second pixel circuit according to the black-out duty ratio. For example, the display device of claim 1, further comprising: a controller for transmitting a synchronization signal to the ambient light sensor so that the ambient light sensor performs light sensing in the sub-time interval. The display device of claim 1, wherein the first pixel circuit includes a first switch, wherein the first switch is not turned on during the first time interval of the first pixel circuit, so that the first light emitting diode The body is not conducting. Such as the display device of claim 1, wherein the display panel further includes a logo, and the ambient light sensor is located above the logo. For example, the display device of claim 1, further comprising: a controller, wherein the processor is further used for determining a dimming coefficient according to the ambient light intensity, and transmitting the dimming coefficient to the controller, wherein the controller further uses Adjust the display brightness of the display panel according to the dimming coefficient degree. Such as the display device of claim 1, wherein the processor is further used to control the pixel circuits of the part to be updated, so that the ambient light sensor performs light sensing when the pixel circuits of the part are updated , Wherein the pixel circuits of the part are located above the ambient light sensor. A display method is suitable for a display device, wherein a display panel of the display device includes a plurality of pixel circuits, wherein the pixel circuits include a first pixel circuit and a second pixel circuit, and the first picture The pixel circuit is coupled to a first gate line, the second pixel circuit is coupled to a second gate line, the first pixel circuit and the second pixel circuit are located above an ambient light sensor, The display method includes: controlling the first pixel circuit so that the first pixel circuit does not light up in a first time interval in an update time interval of the first pixel circuit; controlling the second pixel circuit Circuit, so that the second pixel circuit does not light up in a first time interval in an update time interval of the second pixel circuit; and controls the ambient light sensor in the first pixel circuit of the first pixel circuit Perform light sensing in a time interval to obtain an ambient light intensity, wherein the step of controlling the ambient light sensor to perform light sensing in the first time interval of the first pixel circuit includes: controlling the ambient light sensing The sensor performs light sensing in a sub-time interval when the first pixel circuit and the second pixel circuit are not lit; and adjusts the display brightness of the display panel according to the ambient light intensity.

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