TWI688946B - Display device - Google Patents

Abstract

A display device includes a first light emitting circuit, a first scan circuit, a second scan circuit, and a first control circuit. The first scan circuit is configured to drive the first light emitting circuit to emit light. The second scan circuit is configured to stop the first light emitting circuit emitting light. The first control circuit is configured to selectively provide one of the first scan signal and a first stop signal to the first light emitting circuit, so as to stop the first light emitting circuit emitting light.

Description

Display device

The invention relates to an electronic device. Specifically, the present invention relates to a display device.

With the rapid development of electronic technology, display devices have been widely used in people's lives, such as mobile phones or computers.

Some display devices may include a display module and a backlight module. The backlight module is used to emit light. The display module includes a pixel circuit array. The display device uses a pixel circuit array to control the light passing amount of each pixel to perform a display operation.

Therefore, the operation coordination between the backlight module and the pixel circuit array is an important issue in the field.

An embodiment of the present invention relates to a display device. According to an embodiment of the invention, the display device includes: a first light emitting circuit, a first scanning circuit, a second scanning circuit, and a first control circuit. For the first scanning circuit To drive the first light emitting circuit to emit light. The second scanning circuit is used to provide a first scanning signal to the first light-emitting circuit, so that the first light-emitting circuit stops emitting light. The first control circuit is used to selectively provide one of the first scan signal and a first stop signal to the first light-emitting circuit, so that the first light-emitting circuit stops emitting light.

Another embodiment of the present invention relates to a display device. According to an embodiment of the invention, the display device includes: a light emitting circuit, a scanning circuit, and a control circuit. The scanning circuit is used to provide a scanning signal. The control circuit includes: a first switch, a second switch, and a third switch. A first terminal of the first switch is used to receive a stop signal, a second terminal of the first switch is electrically connected to the input terminal of the light emitting circuit, and a control terminal of the first switch is used to receive a control Signal. A first terminal of the second switch is used to receive the scan signal, and a second terminal of the second switch is electrically connected to the input terminal of the light emitting circuit. A first terminal of the third switch is used to receive a supply voltage, a second terminal of the third switch is electrically connected to a control terminal of the second switch, and the third switch is used to receive the control signal.

By applying the above embodiment, the first control circuit can selectively use the first scan signal or the first stop signal to stop the first light-emitting circuit from emitting light, thereby increasing the flexibility of control.

100‧‧‧Display device

DSM‧‧‧Display module

BLM‧‧‧Backlight module

DGU‧‧‧scanning circuit

DSY‧‧‧Pixel array

BGUL, BGUR‧‧‧ scanning circuit

BLY‧‧‧Backlight array

BL1,...,BLN‧‧‧Backlight circuit

BGL(1), ..., BGL(N) ‧‧‧ scanning signal

BGR(1), ..., BGR(N) ‧‧‧ scanning signal

TFC(n), TFC(n+1)‧‧‧‧Control circuit

DRV(n), DRV(n+1)‧‧‧Lighting circuit

OFF(n), OFF(n+1)‧‧‧stop signal

CTL‧‧‧Control signal

During DPT, DON, TLTC‧‧‧

toff‧‧‧time

T1-T4‧‧‧ switch

VGL, VGH‧‧‧Voltage

A‧‧‧Node

G(m)‧‧‧scan signal

t0-t5‧‧‧time

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the drawings are described as follows: FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention; FIG. 2 is a schematic diagram of a backlight module according to an embodiment of the invention; FIG. 3 is a diagram according to an embodiment of the invention A schematic diagram of a backlight control circuit shown; FIG. 4 is a schematic diagram of an operating state of a display device according to an embodiment of the invention; FIG. 5 is a schematic diagram of a control circuit according to an embodiment of the invention; Figure 6 is a schematic diagram of a control circuit according to an embodiment of the present invention; Figure 7 is a schematic diagram of a control circuit according to an embodiment of the present invention; Figure 8 is a drawing according to an operation example of the present invention Figure 9 is a signal diagram of the control circuit shown; and Figure 9 is a signal diagram of the control circuit according to an operation example of the present invention.

The spirit of this disclosure will be clearly illustrated in the following figures and detailed descriptions. Anyone with ordinary knowledge in the art can understand the embodiments of this disclosure, and they can be changed and modified by the techniques taught in this disclosure. It does not deviate from the spirit and scope of this disclosure.

Regarding the terms "first", "second", ... etc. used in this article, they do not specifically refer to order or order, nor are they intended to limit the present invention. They are only used to distinguish the elements described in the same technical terms or operating.

With regard to the "electrical connection" used in this article, it can mean that two or more elements directly make physical or electrical contact with each other, or indirectly make physical or electrical contact with each other, and "electrical connection" can also mean two or Multiple elements interoperate or act.

The terms "contains", "includes", "has", "contains", etc. used in this article are all open terms, which means including but not limited to.

As used herein, "and/or" includes any or all combinations of the things described.

The terms "approximately" and "approximately" used in this article are used to modify the quantity or error of any slight change, but such slight change or error will not change its essence.

Regarding the terms used in this article, unless otherwise noted, they usually have the ordinary meaning that each term is used in this field, in the content disclosed here, and in the special content. Certain terms used to describe this disclosure will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in the description of this disclosure.

FIG. 1 is a schematic diagram of a display device 100 according to an embodiment of the invention. In this embodiment, the display device 100 may include a display module DSM and a backlight module BLM. In this embodiment, the display module DSM and the backlight module BLM are stacked up and down.

In this embodiment, the display module DSM includes a scanning circuit DGU and a pixel array DSY. The pixel array DSY may include a plurality of pixel circuits arranged in a matrix. The scanning circuit DGU can sequentially generate and provide a plurality of scanning signals (such as the scanning signal G(m) in FIG. 8) to the pixel circuits in the pixel array DSY, so that the pixel circuits update the data voltage line by line.

In this embodiment, the backlight module BLM includes scanning circuits BGUL, BGUR, and a backlight array BLY.

Referring to FIG. 2, in one embodiment, the backlight array BLY includes a plurality of backlight circuits BL1,..., BLN, where N is a natural number. Each backlight circuit BL1, ..., BLN includes a plurality of light emitting elements, and the light emitting elements in each backlight circuit BL1, ..., BLN are arranged in one or more columns. The scanning circuit BGUL can sequentially generate and provide a plurality of scanning signals BGL(1), ..., BGL(N) to the backlight circuits BL1, ..., BLN, so that the backlight circuits BL1, ..., BLN can be sequentially used The light emitting element emits light. The scanning circuit BGUR can sequentially generate and provide a plurality of scanning signals BGR(1), ..., BGR(N) to the backlight circuits BL1, ..., BLN, so that the backlight circuits BL1, ..., BLN emit light The light-emitting elements stop emitting light in sequence. In this way, the backlight module BLM can emit light in accordance with the operation of the display module DSM.

Referring to FIG. 3, the following will take the backlight circuits BLn, BLn+1 (where n+1 is not greater than N) as an example to explain the specific details of this case, but this case is not limited to the following embodiments.

In one embodiment, the backlight circuit BLn may include a control circuit TFC(n) and a light emitting circuit DRV(n). In an embodiment, the control circuit TFC(n) is used to receive the stop signal OFF(n), the scan signal BGR(n) and the control signal CTL, and is used to selectively provide one of the scan signal BGR(n) and the stop signal OFF(n) to the light emitting circuit DRV(n), so that the light emitting circuit DRV(n) stops emitting light.

In one embodiment, the control circuit TFC(n) provides a stop signal OFF(n) to the light emitting circuit DRV(n) when the control signal CTL is received, so that the light emitting circuit DRV(n) stops emitting light. In one embodiment, the control circuit TFC(n) provides the scan signal BGR(n) to the light emitting circuit DRV(n) when the control signal CTL is not received and the scan signal BGR(n) is received, so that The light emitting circuit DRV(n) stops emitting light.

On the other hand, the structure and operation of the backlight circuit BLn+1 and the backlight circuit BLn are substantially similar, so the details can refer to the relevant description of the backlight circuit BLn, which will not be repeated here.

In one embodiment, the timing of the scanning signal BGR(n) and the scanning signal BGR(n+1) are different (for example, a difference of one line time). In one embodiment, the timing of the stop signal OFF(n) and the stop signal OFF(n+1) are approximately the same. In one embodiment, the stop signal OFF(n) and the stop signal OFF(n+1) may be the same signal.

Through the above operations, the display device 100 can selectively use the scan signals BGR(n), BGR(n+1) or the stop signals OFF(n), OFF(n+1) to stop the backlight module BLM from emitting light. And increase the flexibility of control.

For example, referring to FIG. 4, during the period DPT, the pixel circuit corresponding to the backlight circuit BL1 updates the data voltage. Then, during the period DON, the backlight circuit BL1 emits light. Then, after During the DPT period, the pixel circuit corresponding to the backlight circuit BL1 again updates the data voltage. The backlight circuits BL2-BL6 and corresponding pixel circuits also perform similar operations.

In this example, at the time point toff, the backlight circuits BL2-BL5 stop emitting light according to the corresponding control signal CTL. As a result, the light-emitting period TLTC (also known as latency) of the backlight circuits BL1-BL6 as a whole can be shortened. In some applications (such as a virtual reality display helmet), by reducing the overall lighting period of the backlight module BLM, the user can avoid dizziness.

Referring to FIG. 5, in an embodiment, the aforementioned control circuit TFC(n) includes switches T1-T4. In one embodiment, the switch T1 is electrically connected between the input terminal of the stop signal OFF(n) and the input terminal of the light emitting circuit DRV(n), and the control terminal of the switch T1 is used to receive the control signal CTL. In one embodiment, the switch T1 is turned on according to the control signal CTL to provide a stop signal OFF(n) to the light emitting circuit DRV(n). In one embodiment, the stop signal OFF(n) can be implemented with the supply voltage VGH (for example, having a high voltage level).

In one embodiment, the switch T2 is electrically connected between the input terminal of the scan signal BGR(n) and the input terminal of the light emitting circuit DRV(n), and the control terminal of the switch T2 is electrically connected to the node A. In one embodiment, the switch T2 is used to turn on according to the voltage on the node A to provide the scan signal BGR(n) to the light emitting circuit DRV(n).

In an embodiment, the switch T3 is electrically connected between the input terminal of the supply voltage VGL (for example, having a low voltage level) and the node A, and The control terminal off T3 is used to receive the control signal CTL. In an embodiment, the switch T3 is turned on according to the control signal CTL to provide the supply voltage VGL to the node A, so that the switch T2 is turned off.

In an embodiment, the first terminal and the control terminal of the switch T4 are electrically connected to the input terminal of the supply voltage VGH, and the second terminal of the switch T4 is electrically connected to the node A. In one embodiment, the switch T4 is used to provide the supply voltage VGH to the node A, so that the switch T2 is turned on.

Referring to FIG. 6, in a first operating state, the switch T1 is turned on according to the control signal CTL to provide a stop signal OFF(n) to the input terminal of the light emitting circuit DRV(n), and the switch T3 is turned on according to the control signal CTL to The supply voltage VGL is provided to the control terminal of the switch T2 to turn off the switch T2 to prevent the scan signal BGR(n) from being provided to the light emitting circuit DRV(n).

Referring to FIG. 7, in a second operation state, since the control signal CTL is not received, the switch T1 and the switch T3 are turned off. At this time, the switch T2 is turned on according to the supply voltage VGH on the node A to provide the scan signal BGR(n) to the input end of the light emitting circuit DRV(n) when the scan signal BGR(n) is received.

The following will match the figures 6-9 to illustrate the specific details of the case with two operation examples, but this case is not limited to the following operation examples.

Referring to FIG. 8, between the time point t0 and the time point t1, the pixel circuit corresponding to the backlight circuit BLn updates the data voltage according to the scan signal G(m).

Then, between time t2 and time t3, the backlight The road BLn emits light according to the scan signal BGL(n).

Between time t1 and time t3, since the backlight circuit BLn does not receive the control signal CTL, the control circuit TFC(n) in the backlight circuit BLn is in the aforementioned second operating state (refer to FIG. 7), in order to receive When the scanning signal BGR(n) is reached, the scanning signal BGR(n) is provided to the input end of the light emitting circuit DRV(n).

Between time t3 and time t4, the backlight circuit BLn control circuit TFC(n) outputs a stop signal OFF(n) to the light emitting circuit DRV(n) according to the control signal CTL, so that the light emitting circuit DRV(n) stops emitting light. During this period, the control circuit TFC(n) in the backlight circuit BLn is in the aforementioned first operating state (refer to FIG. 6).

In contrast, referring to FIG. 9, if the backlight circuit BLn continues to receive no control signal CTL, the control circuit TFC(n) in the backlight circuit BLn continues to maintain the aforementioned second operating state (see FIG. 7 ). In this way, between the time point t2 and the time point t4, the backlight circuit BLn emits light according to the scan signal BGL(n), and between the time point t4 and the time point t5, the backlight circuit BLn according to the scan signal BGR(n) Stop glowing.

Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Anyone who is familiar with this skill can make various modifications and retouching without departing from the spirit and scope of the present invention, so the protection of the present invention The scope shall be as defined in the appended patent application scope.

BLn, BLn+1‧‧‧‧Backlight circuit

BGL(n), BGL(n+1)‧‧‧scan signal

BGR(n), BGR(n+1)‧‧‧scan signal

TFC(n), TFC(n+1)‧‧‧‧Control circuit

DRV(n), DRV(n+1)‧‧‧Lighting circuit

OFF(n), OFF(n+1)‧‧‧stop signal

CTL‧‧‧Control signal

Claims (10)

A driving circuit of a display device includes: a first light emitting circuit; a first scanning circuit for driving the first light emitting circuit to emit light; and a second scanning circuit for providing a first scanning signal to the first light emitting A circuit to stop the first light-emitting circuit from emitting light; and a first control circuit to selectively provide one of the first scan signal and a first stop signal to the first light-emitting circuit to make the first light-emitting circuit A light-emitting circuit stops emitting light. The driving circuit according to claim 1, wherein the first control circuit provides the first stop signal to the first light emitting circuit when the first control circuit receives a control signal. The driving circuit according to claim 2, wherein in the case where the first control circuit does not receive the control signal and receives the first scan signal, the first control circuit provides the first scan signal to the first light emitting Circuit. The driving circuit according to claim 1, wherein the first control circuit includes: a first switch for providing the first stop signal to the first light-emitting circuit according to a control signal; A second switch is used to provide the first scan signal to the first light-emitting circuit; and a third switch is used to turn off the second switch according to the control signal. The driving circuit according to claim 4, wherein in a first operating state, the first switch is turned on according to the control signal to provide the first stop signal to the first light-emitting circuit, and the third switch is based on the The control signal is turned on to turn off the second switch. The driving circuit according to claim 4, wherein in a second operating state, the first switch and the third switch are turned off, and the second switch is turned on to provide the first scan signal to the first light emission Circuit. The driving circuit according to claim 1, further comprising: a second light-emitting circuit, wherein the first scanning circuit is used to sequentially drive the first light-emitting circuit and the second light-emitting circuit to emit light; and a second control circuit, Used to selectively provide one of a second stop signal and a second scan signal from the second scan circuit to the second light-emitting circuit to stop the second light-emitting circuit from emitting light; wherein the second scan signal The timing is different from that of the first scan signal, and the timing of the first stop signal and the second stop signal are approximately the same. A driving circuit of a display device, including: a light emitting circuit; a scanning circuit for providing a scanning signal; and a control circuit, including: a first switch, a first end of the first switch is used to receive a stop Signal, a second end of the first switch is electrically connected to the input end of the light-emitting circuit, and a control end of the first switch is used to receive a control signal; a second switch, a first end of the second switch One end is used to receive the scan signal, a second end of the second switch is electrically connected to the input end of the light emitting circuit; and a third switch, a first end of the third switch is used to receive a supply voltage , A second terminal of the third switch is electrically connected to a control terminal of the second switch, and the third switch is used to receive the control signal. The driving circuit according to claim 8, wherein in a first operating state, the first switch is turned on according to the control signal to provide the stop signal to the input terminal of the light emitting circuit, and the third switch is based on the The control signal is turned on to provide the supply voltage to the control end of the second switch to turn off the second switch. The driving circuit according to claim 8, wherein in a second operating state, the first switch and the third switch are turned off, and the second switch is turned on to provide the scan signal to the input of the light emitting circuit end.

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