WO2013027705A1

WO2013027705A1 - Display device, control device, and electronic apparatus

Info

Publication number: WO2013027705A1
Application number: PCT/JP2012/071012
Authority: WO
Inventors: 齊藤　浩二; 正樹植畑; 正実尾崎
Original assignee: シャープ株式会社
Priority date: 2011-08-25
Filing date: 2012-08-20
Publication date: 2013-02-28
Also published as: TW201316312A

Abstract

A display device (1) of an embodiment of the present invention is provided with a timing controller (10) and a frame period control unit (15) that make an image be displayed while controlling the frame period with reference to frame period information. When the frame period that the frame period information denotes changes from a first frame period to a second frame period, the change from the first frame period to the second frame period is made stepwise.

Description

Display device, control device, and electronic device

The present invention relates to a display device that displays an image and a control device that supplies the image to the display device. The present invention also relates to an electronic device including a display device and a control device.

In recent years, thin, lightweight, and low power consumption display devices typified by liquid crystal display devices have been actively used. Such a display device is remarkably mounted on, for example, a mobile phone, a smartphone, a PDA (portable information terminal), an electronic book, a laptop personal computer, and the like. In the future, electronic paper, which is a thinner display device, is expected to develop and spread rapidly. Under such circumstances, in various display devices, reducing power consumption and improving display image quality are common issues.

Therefore, various technologies have been devised to solve such problems.

Patent Document 1 discloses a technique for improving display image quality by preventing image disturbance by synchronizing the timing of image data to be output to an image display unit step by step with the timing of input image data. Yes.

Japanese Patent Publication “Japanese Patent Laid-Open No. 2004-341358 (published on December 2, 2004)”

In addition, in order to improve the display image quality, it has been conventionally performed to set a short frame period of an image displayed on the display panel, that is, to set a high refresh rate.

Generally, in the display panel, the display quality improves as the frame period is set shorter. On the other hand, if the frame period is set to be short, the frequency of frame rewriting on the display panel increases, and thus power consumption increases.

Therefore, when priority is given to display image quality, for example, when displaying moving images or when high image quality mode is selected, the frame period is set short, and when displaying still images or when the low power consumption mode is set. When priority is given to low power consumption, such as when selected, the frame period is set longer.

However, there is a problem that when the frame period is changed suddenly, the viewer feels visually uncomfortable. This is because the user's eyes cannot keep up with the change in the frame period, and the change in the frame period makes the user feel uncomfortable such as flickering of the displayed image.

The present invention has been made in view of the above-described problems, and its main purpose is to reduce visual discomfort to the user even when the frame period, that is, the refresh rate changes sharply. It is an object of the present invention to provide a display device that can do this.

In order to solve the above problem, a display device according to one embodiment of the present invention includes a plurality of gate lines, a plurality of data lines arranged to intersect the plurality of gate lines, and the plurality of gate lines. A display panel having a plurality of pixels defined by the plurality of data lines, and a control means for displaying an image on the display panel while controlling the frame period with reference to the frame period information. When the frame period indicated by the frame period information changes from the first frame period to the second frame period, the means steps the frame period from the first frame period to the second frame period. It is characterized by changing.

According to the above configuration, the frame cycle control means includes the first frame cycle and the second subsequent frame between the display period using the first frame cycle and the display time using the second frame cycle. A transition period of a frame period having an intermediate frame period with the frame period is provided, and the intermediate frame period value is changed stepwise in the transition period.

As a result, even when the frame period indicated by the frame period information changes steeply, the display device gives the user a visual discomfort such as flickering of the image by the abrupt change of the frame period indicated by the frame period signal. Can be reduced.

Note that the image may be a moving image or a still image. When the image is a still image, the frame period indicates a refresh rate.

In order to solve the above problems, a control device according to an aspect of the present invention is a control device including a control unit that controls a frame period of an image to be displayed on a display panel, and the control unit includes the frame period. When changing from the first frame period to the second frame period, the frame period is changed stepwise from the first frame period to the second frame period.

According to the above configuration, even when the control unit changes the frame period sharply, the frame period of the image displayed on the display device is steep by changing the frame period transmitted to the display device stepwise. Can be prevented. As a result, the control device can alleviate the visual discomfort such as flickering of the image due to the abrupt change of the frame period of the image displayed on the display device.

In order to solve the above problems, an electronic device according to one embodiment of the present invention includes a plurality of gate lines, a plurality of data lines arranged to intersect the plurality of gate lines, and the plurality of gate lines. An electronic apparatus comprising: a display device including a display panel having a plurality of pixels defined by the plurality of data lines; and a control device that controls a frame cycle of an image displayed on the display panel, wherein the frame cycle Control means for changing the frame period stepwise from the first frame period to the second frame period when the first frame period changes from the first frame period to the second frame period. It is characterized by.

According to the above configuration, the electronic device can prevent the frame period of the image displayed on the display panel included in the display device from changing sharply even when the frame period changes sharply. As a result, it is possible to reduce visual discomfort such as image flickering to the user.

As described above, the display device according to one embodiment of the present invention includes a plurality of gate lines, a plurality of data lines arranged to intersect the plurality of gate lines, and the plurality of gate lines and the plurality of gate lines. A display panel having a plurality of pixels defined by a data line, and a control unit that displays an image on the display panel while controlling the frame period with reference to frame period information, and the control unit includes: When the frame period indicated by the frame period information changes from the first frame period to the second frame period, the frame period is changed stepwise from the first frame period to the second frame period. It is characterized by that.

As a result, even when the frame period indicated by the frame period information changes abruptly, the display device causes the user to feel visually uncomfortable, such as an image flickering, because the frame period of the image displayed on the display panel changes abruptly. Can be reduced.

It is a figure which shows the whole structure of the electronic device which concerns on one Embodiment of this invention. It is a figure which shows an example of the frame period in the display panel of the display apparatus with which the electronic device which concerns on one Embodiment of this invention is provided. It is a figure which shows an example of the frame period in the display panel of the display apparatus with which the electronic device which concerns on other embodiment of this invention is provided. It is a figure which shows an example of the frame period in the display panel of the display apparatus with which the electronic device which concerns on further another embodiment of this invention is provided. It is a figure which shows an example of the frame period in the display panel of the display apparatus with which the electronic device which concerns on further another embodiment of this invention is provided. It is a figure which shows the whole structure of the electronic device which concerns on further another embodiment of this invention. It is a figure which shows an example of the frame period in the display panel of the display apparatus with which the electronic device which concerns on further another embodiment of this invention is provided. It is a figure which shows the structure of the pixel with which the display panel of the display apparatus which concerns on this invention is provided. It is a figure which shows the characteristic of various TFT.

<Embodiment 1>
An electronic apparatus according to an embodiment of the present invention will be described below with reference to FIGS.

[Configuration of electronic equipment]
First, a configuration example of the electronic device 100 according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating an overall configuration of an electronic device 100 according to the present embodiment.

As shown in FIG. 1, the electronic device 100 includes a display device 1 and a system-side control unit (control device) 30. Further, as shown in FIG. 1, the display device 1 includes a display panel 2, a scanning line driving circuit 4, a signal line driving circuit 6, a common electrode driving circuit 8, a timing controller (control means) 10, and a power supply circuit 12. ing.

In the present embodiment, an active matrix type liquid crystal display device is employed as the display device 1. Therefore, the display panel 2 of the present embodiment is an active matrix type liquid crystal display panel, and the other components described above are for driving the liquid crystal display panel.

(Display panel)
The display panel 2 includes a plurality of pixels, a plurality of gate signal lines (gate lines) G, and a plurality of source signal lines (data lines) S.

A plurality of pixels are defined by a plurality of gate signal lines G and a plurality of source signal lines S. The plurality of pixels are arranged in a so-called lattice shape including a plurality of pixel columns and a plurality of pixel rows.

The plurality of gate signal lines G are juxtaposed in the pixel column direction (direction along the pixel column). Each of the plurality of gate signal lines G is electrically connected to each pixel of the corresponding pixel row of the plurality of pixel rows.

The plurality of source signal lines S are juxtaposed in the pixel row direction (the direction along the pixel rows), and all are orthogonal to each of the plurality of gate signal lines G. Each of the plurality of source signal lines S is electrically connected to each pixel of the corresponding pixel column of the plurality of pixel columns.

In the example shown in FIG. 1, the display panel 2 is provided with N source signal lines S and M gate signals in accordance with a plurality of pixels arranged in N columns × M rows. Line G is provided.

(Scanning line drive circuit)
The scanning line driving circuit 4 sequentially selects and scans the plurality of gate signal lines G. Specifically, the scanning line driving circuit 4 sequentially selects a plurality of gate signal lines G, and with respect to the selected gate signal line G, switching elements (TFTs) provided in each pixel on the gate signal line G. ) Is supplied to turn on.

(Signal line drive circuit)
While the gate signal line G is selected, the signal line driving circuit 6 supplies a source signal corresponding to the image data from the corresponding source signal line S to each pixel on the gate signal line G. More specifically, the signal line driving circuit 6 calculates the value of the voltage to be output to each pixel on the selected gate signal line G based on the input image data, and uses the voltage of the value as a source. Output from the output amplifier toward each source signal line S. As a result, a source signal is supplied to each pixel on the selected gate signal line G, and the source signal is written.

(Common electrode drive circuit)
The common electrode driving circuit 8 supplies a predetermined common voltage for driving the common electrode to the common electrode provided in each of the plurality of pixels.

(Timing controller)
An image signal and a control signal are input to the timing controller 10 from the system control unit 30. Here, the image signal includes a clock signal, a synchronization signal, image data, and the like. Further, the control signal includes frame period setting information (hereinafter also referred to as frame period information) in the display device 1. The image may be a moving image or a still image.

As shown by solid line arrows in FIG. 1, the timing controller 10 outputs various control signals for operating each driving circuit in synchronization with each driving circuit.

For example, the timing controller 10 supplies a gate start pulse signal, a gate clock signal GCK, and a gate output control signal GOE to the scanning line driving circuit 4. When receiving the gate start pulse signal, the scanning line driving circuit 4 starts scanning the plurality of gate signal lines G. Then, the scanning line driving circuit 4 sequentially supplies an ON voltage to each gate signal line G according to the gate clock signal GCK and the gate output control signal GOE.

The timing controller 10 outputs image data, a source start pulse signal, a source latch strobe signal, and a source clock signal to the signal line driving circuit 6. Based on the source start pulse signal, the signal line driving circuit 6 stores the input image data of each pixel in a register according to the source clock signal, and the image data for each source signal line S according to the next source latch strobe signal. The source signal corresponding to the is supplied.

(Power circuit)
The power supply circuit 12 supplies a voltage to each of the scanning line drive circuit 4, the signal line drive circuit 6, and the common electrode drive circuit 8, as indicated by a dotted arrow in FIG. To do.

(System side control part)
The system-side control unit 30 outputs an image signal and a control signal to the timing controller 10 included in the display device 1.

[Further functions of display device]
Here, the display device 1 of the present embodiment further includes a frame cycle control unit (control means) 15. For example, in the example illustrated in FIG. 1, the display device 1 is provided with a frame period control unit 15 as one function of the timing controller 10.

(Frame period controller)
The frame cycle control unit 15 refers to the frame cycle information and controls the frame cycle of an image that the timing controller 10 displays on the display panel 2. Specifically, when the frame period indicated by the frame period information included in the control signal supplied from the system-side control unit 30 changes, the frame period control unit 15 changes the frame period before the change indicated by the frame period information ( From the second frame period) to the changed frame period (first frame period) indicated by the frame period information, the frame period is changed gradually, that is, stepwise.

In other words, the frame period control unit 15 includes the frame period before the change and the frame period after the change between the display period using the frame period before the change and the display time using the frame period after the change. The frame period transition period having an intermediate frame period is provided.

Based on the received frame period information, the frame period control unit 15 determines the number of steps to change the frame period from the frame period before the change indicated by the frame period information to the frame period after the change indicated by the frame period information. To do.

As a method for determining the number of steps for changing the frame period, for example, when the period difference between the frame period before the change and the frame period after the change is large, the number of stages is increased, and when the period difference is small, the step number is determined. A method for reducing the number can be mentioned. By determining the number of steps in this way, the frame period can be smoothly changed from the frame period before the change to the frame period after the change in accordance with the change in the frame period.

As a method of determining the period difference between the frame periods at each stage of changing the frame period, for example, a method of setting a uniform period difference in advance can be mentioned.

Also, a method of increasing the period difference near the frame period of 25 ms and 50 ms (for example, 4 ms) and decreasing the period difference near the frame period of 33 ms (for example, 2 ms) can be used. For example, when the frame period changes from 16.7 ms to 50 ms, the frame period may be changed to 16.7 ms, 20 ms, 24 ms, 28 ms, 31 ms, 33 ms, 35 ms, 38 ms, 42 ms, 46 ms, and 50 ms.

In the present embodiment, the timing controller 10 and the frame cycle control unit 15 constitute a control means.

Here, the frame period is the reciprocal of the refresh rate. For example, when the refresh rate is 60 Hz, 60 frames are displayed on the display panel 2 per second. Therefore, the corresponding frame period is 1/60 = 16.7 ms. Similarly, when the refresh rate is 40 Hz, the frame period is 25 ms, and when the refresh rate is 30 Hz, the frame period is 33 ms.

In this embodiment, a case where the refresh rate is lowered, that is, a case where the frame period is lengthened will be described as an example.

In the present embodiment, a configuration in which the frame cycle control unit 15 determines how to change the frame cycle from the frame cycle information will be described as an example, but the present invention is limited to this. is not. For example, the frame period information includes setting information indicating how to change the frame period, and the frame period information includes how the frame period control unit 15 changes the frame period. You may employ | adopt the structure determined based on setting information.

[Operation of electronic equipment]
The operation of the electronic device 100 according to the present embodiment will be described with reference to FIG. FIG. 2 is a diagram illustrating an example of a frame period of the display panel 2 included in the display device 1 included in the electronic apparatus 100 according to the present embodiment. 2A shows the frame period indicated by the frame period signal supplied from the system-side control unit 30, and FIG. 2B shows the frame period displayed on the display panel 2 included in the display device 1. FIG. Show.

The timing controller 10 and the frame cycle control unit 15 included in the display device 1 have a frame cycle of 16.7 ms as shown in FIG. 2 together with the image signal from the system side control unit 30 in the period from time T0 to T1. A control signal including frame period information indicating the presence is received.

The timing controller 10 drives the scanning line driving circuit 4 and the signal line driving circuit 6 according to the frame period of 16.7 ms indicated by the frame period information received by the frame period control unit 15, and from the system side control unit 30. An image indicated by the supplied image signal is displayed on the display panel 2.

The frame cycle control unit 15 receives a control signal including frame cycle information indicating that the frame cycle is 33 ms from the system-side control unit 30 at time T1 together with the image signal.

When the frame period indicated by the received frame period information changes, the frame period control unit 15 gradually changes the frame period from the frame period before the change indicated by the frame period information to the frame period after the change indicated by the frame period information. Change.

As shown in FIG. 2A, the frame cycle control unit 15 determines that the frame cycle indicated by the frame cycle information received from the system-side control unit 30 changes from 16.7 ms to 33 ms in frames before and after time T1. , (B), the period from time T1 to T2 is set as the transition time, and the frame period is changed stepwise.

As shown in FIG. 2B, the frame period control unit 15 changes the frame period from 16.7 ms, which is the frame period of the immediately preceding frame, to 20 ms in the frame immediately after the time T1, and next (FIG. 2). (B), the frame period is changed from 20 ms to 25 ms in the frame immediately before time T2. The frame cycle control unit 15 further changes the frame cycle from 25 ms to 33 ms in the frame immediately after time T2, and sets the frame cycle to 33 ms in the subsequent frames.

The timing controller 10 drives the scanning line driving circuit 4 and the signal line driving circuit 6 in accordance with the frame period changed stepwise by the frame period control unit 15, and the image signal supplied from the system side control unit 30 is The displayed image is displayed on the display panel 2.

Specifically, the timing controller 10 displays an image with a frame period of 20 ms in the frame immediately after the time T1, and displays an image with a frame period of 25 ms in the next frame. Further, the timing controller 10 drives the scanning line driving circuit 4 and the signal line driving circuit 6 so as to display an image with a frame period of 33 ms in a frame immediately after the time T2.

As a result, even when the frame period indicated by the frame period signal changes abruptly, the display device 1 gives the user a visual discomfort by abruptly changing the frame period of the image displayed on the display panel 2. Can be prevented.

It should be noted that the visual discomfort given to the user due to a sharp change in the frame period appears particularly prominently when the frame period is lengthened (refresh rate is lowered). This is because flickering of the displayed image becomes conspicuous as the frame period becomes longer.

Therefore, when the frame period indicated by the frame period signal is steeply long, by applying the above-described configuration, it is possible to obtain a remarkable effect of reducing the user's visual discomfort.

In the present embodiment, the case where the frame period is changed to be longer (that is, the refresh rate is lower) has been described as an example. However, the present invention is not limited to this, and the frame period is not limited to this. Can also be adopted when the value becomes shorter (that is, the refresh rate becomes higher).

<Embodiment 2>
Another embodiment of the present invention will be described with reference to FIG. For convenience of explanation, constituent elements having the same functions as those of the constituent elements according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the present embodiment, differences from the first embodiment will be mainly described.

FIG. 3 is a diagram illustrating an example of a frame period of the display panel 2 included in the display device 1 included in the electronic apparatus 100 according to the present embodiment. 3A shows the frame period indicated by the frame period signal supplied from the system-side control unit 30, and FIG. 3B shows the frame period displayed on the display panel 2 included in the display device 1. FIG. Show.

(Frame period controller)
The frame cycle control unit 15 according to the present embodiment, when the frame cycle before change indicated by the frame cycle signal and the frame cycle after change indicated by the frame cycle signal include a certain range of frame cycles, The frame period is changed step by step. Specifically, when the frame period indicated by the frame period information included in the control signal supplied from the system-side control unit 30 changes, the frame period control unit 15 changes from the frame period before the change to the frame period after the change. In a range where the frame period is 25 ms or more, the frame period is changed stepwise.

(Operation of electronic equipment)
Since the operation of the electronic device 100 up to time T1 shown in FIG. 3 is the same as the operation of the electronic device 100 described in the first embodiment, the description thereof is omitted.

The frame cycle control unit 15 receives a control signal indicating that the frame cycle indicated by the frame cycle signal is 33 ms together with the image signal from the system-side control unit 30 at time T1.

When the received frame period changes, the frame period control unit 15 changes the frame period in a stepwise manner only in a range where the frame period is 25 ms or more from the frame period before the change to the frame period after the change.

In the present embodiment, as shown in FIG. 3A, the frame cycle control unit 15 has a frame cycle indicated by the frame cycle information received from the system-side control unit 30 in the frame before and after the time T1 of 16.7 ms. As shown in (b), the frame period is changed stepwise within the range of 25 ms or more, with the period from time T1 to T2 as the transition time.

As shown in FIG. 3B, the frame period control unit 15 changes the frame period from 16.7 ms, which is the frame period of the immediately preceding frame, to 25 ms in the frame immediately after time T1, and next (FIG. 3). In (b), the frame period can be changed from 25 ms to 29 ms in the frame immediately before time T2. The frame cycle control unit 15 further changes the frame cycle from 29 ms to 33 ms in the frame immediately after time T2, and sets the frame cycle to 33 ms in the subsequent frames.

The timing controller 10 drives the scanning line driving circuit 4 and the signal line driving circuit 6 in accordance with the frame period changed by the frame period control unit 15, and displays an image indicated by the image signal supplied from the system-side control unit 30. Display on the display panel 2.

Specifically, the timing controller 10 displays an image with a frame period of 25 ms in the frame immediately after the time T1, and displays an image with a frame period of 29 ms in the next frame. The timing controller 10 further drives the scanning line driving circuit 4 and the signal line driving circuit 6 so as to display an image with a frame period of 33 ms in a frame immediately after the time T2.

As a result, even when the frame period indicated by the frame period signal changes sharply, the display device 1 gives the user a visual discomfort by changing the frame period of the image displayed on the display panel 2 sharply. In particular, this can be reduced when the frame period indicated by the frame period information is changed to include a range of 25 ms or more (that is, the refresh rate is 40 Hz or less).

Since the human eye tends to feel uncomfortable when the frame period is 25 ms or more, the user feels uncomfortable by changing the frame period stepwise in the range where the frame period is 25 ms or more as in this embodiment. It can be reduced efficiently.

<Embodiment 3>
Another embodiment of the present invention will be described with reference to FIG. For convenience of explanation, constituent elements having the same functions as those of the constituent elements according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the present embodiment, differences from the first embodiment will be mainly described.

FIG. 4 is a diagram illustrating an example of a frame period of the display panel 2 included in the display device 1 included in the electronic device 100 according to the present embodiment. 4A shows the frame period indicated by the frame period signal supplied from the system-side control unit 30, and FIG. 4B shows the frame period displayed on the display panel 2 included in the display device 1. FIG. Show.

(Frame period controller)
The frame cycle control unit 15 according to the present embodiment has a certain range when the frame cycle before the change indicated by the frame cycle signal and the frame cycle after the change indicated by the frame cycle signal include a certain range of frame cycles. The frame period is changed step by step. Specifically, when the frame period indicated by the frame period information included in the control signal supplied from the system-side control unit 30 changes, the frame period control unit 15 changes from the frame period before the change to the frame period after the change. The frame period is changed stepwise in the range of the frame period from 25 ms to 50 ms.

(Operation of electronic equipment)
Since the operation of the electronic device 100 up to time T1 shown in FIG. 4 is the same as the operation of the electronic device 100 described in the first embodiment, the description thereof is omitted.

The frame cycle control unit 15 receives a control signal including frame cycle information indicating that the frame cycle is 100 ms from the system-side control unit 30 at time T1.

When the frame period indicated by the received frame period information changes, the frame period control unit 15 changes the frame period stepwise from the frame period before the change to the frame period after the change in the range of the frame period from 25 ms to 50 ms. To change.

In the present embodiment, as shown in FIG. 4A, the frame period control unit 15 has a frame period indicated by the frame period information received from the system-side control unit 30 in the frame before and after the time T1 of 16.7 ms. As shown in (b), the frame period is changed stepwise in the range from 25 ms to 50 ms with the period from time T1 to T2 as the transition time.

As shown in FIG. 4 (b), the frame cycle control unit 15 changes the frame cycle from 16.7 ms, which is the frame cycle of the immediately preceding frame, to 25 ms in the frame immediately after time T1, and in the next frame, The frame period can be changed from 25 ms to 29 ms. Further, the frame period control unit 15 sequentially changes the frame period from 33 ms to 40 ms and changes from 40 ms to 50 ms in subsequent frames. The frame cycle control unit 15 further changes the frame cycle from 50 ms to 100 ms in the frame immediately after time T2, and sets the frame cycle to 100 ms in the subsequent frames.

Specifically, the timing controller 10 displays an image with a frame period of 25 ms in the frame immediately after time T1, displays an image with a frame period of 29 ms in the next frame, and sequentially frames 33 ms and 40 ms in subsequent frames. The image is displayed with a frame period of 50 ms. The timing controller 10 further drives the scanning line driving circuit 4 and the signal line driving circuit 6 so as to display an image with a frame period of 100 ms in the frame immediately after the time T2.

As a result, even when the frame period indicated by the frame period signal changes abruptly, the display device may give the user a visually uncomfortable feeling due to the abrupt change of the frame period of the image displayed on the display panel. Can be reduced especially when the frame period is changed to include the range of 25 ms to 50 ms, that is, the refresh rate includes the range of 20 Hz to 40 Hz.

Since the human eye is most likely to feel uncomfortable when the frame period is 25 ms or more and 50 ms or less, by changing the frame period in a stepwise manner within the range of the frame period of 25 ms or more and 50 ms or less, the discomfort given to the user is more efficient Can be reduced well.

<Embodiment 4>
Another embodiment of the present invention will be described with reference to FIG. For convenience of explanation, constituent elements having the same functions as those of the constituent elements according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the present embodiment, differences from the first embodiment will be mainly described.

FIG. 5 is a diagram illustrating an example of a frame period generated by the frame period control unit 15 included in the display device 1 included in the electronic apparatus 100 according to the present embodiment. 5A shows the frame period indicated by the frame period signal supplied from the system-side control unit 30, and FIG. 5B shows the frame period displayed on the display panel 2 included in the display device 1. FIG. Show.

In the present embodiment, as shown in FIG. 5, at time T1, the image signal supplied from the system control unit 30 changes from an image signal indicating the image “A” to an image signal indicating the image “B”. Further, the case where the frame period indicated by the frame period signal included in the control signal changes from 16.7 ms to 100 ms will be described as an example. In the present embodiment, the case where the image “A” is a moving image and the image “B” is a still image will be described as an example. However, the present invention is not limited to this. For example, both the images “A” and “B” may be moving images, may be still images, the image “A” is a still image, and the image “B” is a moving image. May be.

(Display device)
The display device 1 according to the present embodiment includes a frame memory (not shown) that temporarily stores one frame of image data constituting an image signal supplied from the system-side control unit 30. The frame memory stores and extracts image data by the timing controller 10.
(Frame period controller)
When the frame period indicated by the frame period information included in the control signal supplied from the system-side control unit 30 changes, the frame period control unit 15 determines the frame period information from the frame period before the change indicated by the frame period information. The frame period is changed stepwise until the frame period after the change shown in FIG.

Also, the frame cycle control unit 15 displays the image indicated by the image data stored in the frame memory for a predetermined number of frames in the transition period in cooperation with the timing controller 10. The “predetermined number of frames” will be described later.

(Timing controller)
First, when receiving an image signal from the system-side control unit 30, the timing controller 10 stores image data included in the received image signal in a frame memory. Next, the timing controller 10 extracts the image data stored in the frame memory, and the image indicated by the extracted image data is displayed on the display panel 2 by a length corresponding to the frame period indicated by the frame period information. Thus, the scanning line driving circuit 4 and the signal line driving circuit 6 are driven.

Further, the timing controller 10 deletes the extracted image data from the frame memory (deletion process).

In addition, the timing controller 10 switches the image signal received from the system-side control unit 30 to an image signal indicating another image, and when the frame period indicated by the frame period signal changes, the image after switching (after switching) Storage of the image data indicating the image) in the frame memory is delayed until image data indicating the image before switching (image before switching) already stored in the frame memory is extracted by a predetermined number of frames. The predetermined number of times will be described later.

Here, until the image data indicating the image after switching is stored in the frame memory, for example, it may be temporarily stored in a buffer that is a storage unit different from the frame memory provided in the display device 1. Good. In this case, the image data indicating the image after switching may be read from the buffer when stored in the frame memory. Note that the present embodiment is not limited to this.

Specifically, when the timing controller 10 first receives an image signal including the image after switching and a frame cycle signal indicating that the frame cycle changes, the timing controller 10 before switching immediately before receiving the image after switching. The deletion process executed after extracting image data indicating an image from the frame memory is stopped. That is, even after image data indicating an image before switching immediately before receiving an image after switching is extracted in the frame memory, image data indicating the image before switching remains without being deleted.

Next, when the image data indicating the image before switching immediately before receiving the image after switching is extracted by a predetermined number of frames determined by the frame cycle control unit 15, the timing controller 10 A frame constituting the image after switching is newly stored in the frame memory after being deleted from the memory.

By driving as described above, the timing controller 10 extracts the image data indicating the image after switching in the frame memory, and extracts the image data indicating the image before switching from the frame memory by a predetermined number of frames. Delay until

[Operation of electronic equipment]
As shown in FIG. 5, the timing controller 10 and the frame cycle control unit 15 included in the display device 1 include the frame cycle together with the image signal indicating the image “A” from the system-side control unit 30 in the period from time T0 to T1. A control signal including frame period information indicating that 16.7 ms is received is received.

The timing controller 10 stores the image data indicating the image “A” in the frame memory. Further, the timing controller 10 extracts image data indicating the image “A” from the frame memory, and the scanning line driving circuit 4 and the scanning line driving circuit 4 according to the frame period of 16.7 ms indicated by the frame period information received by the frame period control unit 15. The signal line drive circuit 6 is driven. The timing controller 10 displays the image “A” included in the image signal supplied from the system-side control unit 30 in this way on the display panel 2.

At time T1, the frame cycle control unit 15 receives a control signal including frame cycle information indicating that the frame cycle is 100 ms, from the system-side control unit 30, together with an image signal whose image has been switched to “B”. .

In the present embodiment, as shown in FIG. 5A, the frame period control unit 15 has a frame period indicated by the frame period information received from the system-side control unit 30 in the frame before and after the time T1 of 16.7 ms. As shown in (b), the frame period is changed stepwise in the range from 25 ms to 50 ms with the period from time T1 to T2 as the transition time.

The timing controller 10 does not delete the image data indicating the image “A” received immediately before the time T1 at the time T1, and extracts the image data by a predetermined number of frames during the transition period from the time T1 to the time T2. When this is done, the image data is deleted from the frame memory. The predetermined number of frames is the number of times set as appropriate in the timing controller 10, and the number of times the frame period is changed stepwise during the period set by the frame period control unit 15 as the transition period ((b in FIG. 5). ) Is not more than 5) (3 times in FIG. 5).

Note that the timing controller 10 may continue to display the image “A” without deleting the image data indicating the image “A” until the frame immediately before the frame period to be changed step by step becomes the frame period after the change. . In this case, the timing controller 10 deletes the image data indicating the image “A” and displays the image data indicating the image “B” after the image “A” is displayed in the frame immediately before the frame period after the change. The image “B” is displayed when the frame period changes until the frame period after the change is stored.

As shown in FIG. 5B, the frame cycle control unit 15 changes the frame cycle from 16.7 ms, which is the frame cycle of the immediately preceding frame, to 25 ms in the frame immediately after time T1, and in the next frame, The frame period is changed from 25 ms to 29 ms, and the frame period is changed from 33 ms to 40 ms in the next frame. Further, the frame period control unit 15 further changes the frame period from 40 ms to 50 ms in the next frame. The frame cycle control unit 15 further changes the frame cycle from 50 ms to 100 ms in the frame immediately after time T2, and sets the frame cycle to 100 ms in the subsequent frames.

As shown in FIG. 5B, the timing controller 10 drives the scanning line driving circuit 4 and the signal line driving circuit 6 in accordance with the frame period changed by the frame period control unit 15, and the system side control unit An image indicated by the image signal supplied from 30 is displayed on the display panel 2.

Specifically, the timing controller 10 displays the image “A” with a frame period of 25 ms in the frame immediately after the time T1, displays the image “A” with a frame period of 29 ms in the next frame, and then In this frame, the scanning line driving circuit 4 and the signal line driving circuit 6 are driven so that the image “A” is displayed with a frame period of 33 ms. Here, the timing controller 10 displays the image “A” with a frame period of 33 ms, deletes the image data indicating the image “A” from the frame memory, and stores the image data indicating the image “B”. Good.

Further, the timing controller 10 displays the image “B” with a frame period of 40 ms and 50 ms, and further displays the image “B” with a frame period of 100 ms in the frames immediately after the time T2. 4 and the signal line drive circuit 6 are driven.

In this embodiment, when the frame period indicated by the frame period information included in the control signal supplied from the system-side control unit 30 is changed, the frame period control unit 15 changes the frame after the change from the frame period before the change. The case where the frame period is changed stepwise in the range of the frame period from 25 ms to 50 ms up to the period has been described as an example, but the present invention is not limited to this.

For example, a configuration is adopted in which the frame period is changed stepwise from the frame period before the change to the frame period after the change regardless of whether the change in the frame period indicated by the frame period signal includes a predetermined range. May be. Further, when the change of the frame period indicated by the frame period signal includes a frame period of 20 ms or more, the frame period is changed from the frame period before the change to the frame period after the change in the range of the frame period of 20 ms or more. It is also possible to adopt a configuration that changes it automatically.

According to the above configuration, the timing controller 10 and the frame cycle control unit 15 can determine the frame cycle before the change when the frame cycle indicated by the frame cycle signal changes sharply from the frame cycle before the change to the frame cycle after the change. The image indicated by the image data stored in the frame memory is displayed for a predetermined number of frames during the transition period.

Thus, when the image after switching displayed in the frame period after the change is an image different from the image before switching displayed in the frame period before the change, the image before switching is changed to a predetermined value in the transition period. After displaying the number of frames, the image after switching can be displayed. That is, in the transition period, the image after switching can be displayed following display of a predetermined number of frames of the image before switching.

Therefore, since the image can be switched in the transition period, it is possible to prevent the frame period from changing sharply when switching from the image before switching to the image after switching, and to give the user a visual discomfort. Can be reduced.

<Embodiment 5>
An electronic apparatus according to another embodiment of the present invention will be described below with reference to FIGS.

[Configuration of electronic equipment]
First, a configuration example of the electronic device 100 ′ according to the present embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating an overall configuration of the electronic apparatus 100 ′ according to the present embodiment.

As shown in FIG. 6, the electronic apparatus 100 ′ includes a display device 1 ′ and a system-side control unit (control device) 30 ′. In the electronic device 100 ′ according to this embodiment, the timing controller 10 ′ included in the display device 1 ′ does not include a frame cycle control unit, and the system-side control unit 30 ′ includes a frame cycle control unit (control unit). ) The configuration is the same as that of the electronic device 100 described in the first embodiment except that the timing controller 20 including 25 is provided. Here, for convenience of explanation, the same number is attached | subjected to the component which has the function similar to the component which concerns on Embodiment 1, and the description is abbreviate | omitted.

(Timing controller with display device)
The timing controller 10 ′ receives an image signal and a control signal from the system-side control unit 30. The timing controller 10 ′ drives the scanning line driving circuit 4 and the signal line driving circuit 6 based on the input image signal and control signal.

[System side control section]
The system-side control unit 30 ′ outputs an image signal and a control signal to the timing controller 10 ′ included in the display device 1 ′.

(Frame period controller)
The frame cycle control unit 25 is means for controlling frame cycle information of an image to be displayed on the display panel 2 provided in the display device 1 ′. Specifically, when the frame period indicated by the frame period information included in the control signal changes, the frame period control unit 25 changes from the frame period before the change indicated by the frame period information after the change indicated by the frame period information. The frame period is changed stepwise up to the frame period.

(Timing controller)
The timing controller 20 determines whether to switch the image signal from the time point at which the frame period signal indicating the frame period of the frame period generated by the frame period control unit 25 is transmitted.

In this embodiment, the timing controller 20 and the frame cycle control unit 25 constitute a control means.

[Operation of electronic equipment]
The operation of the electronic apparatus 100 ′ according to this embodiment will be described with reference to FIG. FIG. 7 is a diagram illustrating an example of a frame period of the display panel 2 included in the display device 1 included in the electronic apparatus 100 ′ according to the present embodiment. 7A shows a frame period indicated by a frame period signal supplied from the system-side control unit 30 ′, and FIG. 7B shows a frame displayed on the display panel 2 provided in the display device 1 ′. The period is shown.

In the present embodiment, the frame period indicated by the frame period information transmitted by the system-side control unit 30 ′ changes from 16.7 ms to 100 ms, and the image indicated by the image signal switches from the image “A” to the image “B”. A case will be described as an example.

The system-side control unit 30 ′ transmits a control signal including frame period information indicating that the frame period is 16.7 ms together with the image signal indicating the image “A” in the period from time T 0 to T 1.

The timing controller 10 ′ of the display device 1 ′ drives the scanning line driving circuit 4 and the signal line driving circuit 6 according to the frame period of 16.7 ms indicated by the received frame period information, so that the system side control unit The image “A” indicated by the image signal supplied from 30 is displayed on the display panel 2.

In addition, the frame cycle control unit 25 of the system-side control unit 30 ′, when changing the frame cycle from 16.7 ms to 100 ms, sets the period from the time T1 to T2 as a transition period, and the frame cycle ranges from 25 ms to 50 ms. The frame period is changed step by step.

As shown in FIG. 7A, the frame cycle control unit 25 changes the frame cycle from 16.7 ms to 25 ms in the frame immediately after time T1, and changes the frame cycle from 25 ms to 29 ms in the next frame. In the next frame, the frame period is changed from 33 ms to 40 ms. Further, the frame cycle control unit 25 further changes the frame cycle from 40 ms to 50 ms in the next frame. The frame cycle control unit 15 further changes the frame cycle from 50 ms to 100 ms in the frame immediately after time T2, and sets the frame cycle to 100 ms in the subsequent frames.

At this time, the timing controller 20 determines whether to switch the image signal from the time point at which frame period information indicating the frame period of the frame period is transmitted among the frame periods changed by the frame period control unit 25 in stages.

As shown in (a) of FIG. 7, the timing controller 20 transmits the image signal indicating the image “A” until the time point when the frame period signal indicating the 33 ms frame period generated by the frame period control unit 25 is transmitted. Decide what to do. Further, it is determined to switch to the image signal indicating the image “B” from the time when the frame cycle signal indicating the frame period of 40 ms generated by the frame cycle control unit 25 is transmitted.

Note that the timing at which the image signal is switched in the timing controller 20 is not limited to this, and the image signal may be switched from the time point at which the frame period is transmitted as long as it is within the transition period. .

The system-side control unit 30 'transmits a frame period signal and an image signal to the display device 1'.

The timing controller 10 ′ of the display device 1 ′ includes a scanning line driving circuit based on the frame period information and the image signal shown in FIG. 7A received from the system-side control unit 30 ′ during the period from time T1 to T2. 4 and the signal line driving circuit 6 are driven to display the image “A” with a frame period that is changed stepwise as 25 ms, 29 ms, and 33 ms, and the image “B” is displayed as 40 ms and The frame period is changed in steps of 50 ms.

Further, after time T2, the scanning line driving circuit 4 and the signal line driving circuit 6 are driven so that the image “B” is displayed with a frame period of 100 ms.

In the present embodiment, when the frame period control unit 25 changes the frame period indicated by the frame period information, the frame period ranges from 25 ms to 50 ms from the frame period before the change to the frame period after the change. Although the case where the frame period is changed stepwise has been described as an example, the present invention is not limited to this.

According to the above configuration, the system-side control unit 30 ′ displays the display by changing the frame period transmitted to the display device 1 ′ stepwise even when the frame period indicated by the frame period signal is sharply changed. It is possible to prevent the frame period of the image displayed on the device 1 ′ from changing sharply. As a result, the system-side control unit 30 ′ can reduce a user from being given a visual discomfort such as image flickering due to a sharp change in the frame period of the image displayed on the display device 1 ′. it can.

<Modification>
Next, the configuration of the display device 1 and the display panel 2 provided in the display device 1 ′ in the first to fifth embodiments will be described with reference to FIG. FIG. 8 is a diagram illustrating a configuration of pixels included in the display panel 2.

(Configuration of pixels provided in the display panel)
FIG. 8 illustrates a configuration of two pixels (pixel (n, m) and pixel (n + 1, m)) among the plurality of pixels included in the display panel 2 illustrated in FIGS. 1 and 6.

Pixel (n, m) indicates a pixel connected to the source signal line S (n) and the gate signal line G (m). Pixel (n + 1, m) indicates a pixel connected to the source signal line S (n + 1) and the gate signal line G (m). The other pixels included in the display panel 2 have the same configuration as these pixels.

As shown in FIG. 8, the pixel includes a TFT 200 as a switching element. The gate electrode of the TFT 200 is connected to the corresponding gate signal line G. The source electrode of the TFT 200 is connected to the corresponding source signal line S. The drain electrode of the TFT 200 is connected to one end of the liquid crystal capacitor Clc and the storage capacitor Ccs. Note that the other end of the liquid crystal capacitor Clc is connected to the common electrode COM.

When pixel data is written to this pixel, first, an ON voltage is supplied from the gate signal line G to the gate electrode of the TFT 200. Thereby, the TFT 200 is switched to the on state.

When a source signal is supplied from the corresponding source signal line S when the TFT 200 is on, the source signal is supplied from the drain electrode of the TFT 200 to the pixel electrode of the liquid crystal capacitor Clc and the storage capacitor Ccs. .

As described above, when the source signal is supplied to the pixel electrode of the liquid crystal capacitor Clc, the arrangement direction of the liquid crystal sealed between the pixel electrode of the liquid crystal capacitor Clc and the common electrode COM is supplied to the pixel. It changes in accordance with the difference between the voltage level of the source signal and the voltage level supplied to the common electrode COM, and an image corresponding to this difference is displayed.

Further, when a source signal is supplied to the storage capacitor Ccs, a charge corresponding to the voltage of the source signal is stored in the storage capacitor Ccs. Then, the pixel can maintain a state where an image is displayed for a certain period of time due to the electric charge stored in the storage capacitor Ccs.

(Characteristics of TFT with oxide semiconductor as semiconductor layer)
In Embodiments 1 to 5, the TFT 200 is not particularly limited, but a TFT having a semiconductor layer made of a so-called oxide semiconductor can be employed as the TFT 200. Note that an oxide semiconductor includes, for example, IGZO (InGaZnOx).

The characteristics of the TFT 200 when an oxide semiconductor is used as the TFT 200 will be described with reference to FIG. FIG. 9 is a diagram showing characteristics of various TFTs. Specifically, FIG. 9 shows characteristics of a TFT using an oxide semiconductor as a semiconductor layer, a TFT using a-Si (amorphous silicon), and a TFT using LTPS (Low Temperature Poly Silicon). ing.

In FIG. 9, the horizontal axis (Vgh) indicates the voltage value of the on-voltage supplied to the gate in each TFT, and the vertical axis (Id) indicates the amount of current between the source and drain in each TFT. .

In particular, a period indicated as “TFT-on” in the figure indicates a period in which the transistor is on according to the voltage value of the on-voltage, and a period indicated as “TFT-off” in the figure. Indicates a period in which it is in an OFF state according to the voltage value of the ON voltage.

As shown in FIG. 9, a TFT using an oxide semiconductor has a higher amount of current (that is, electron mobility) in an on state than a TFT using a-Si. Although illustration is omitted, a TFT using an oxide semiconductor has an electron mobility about 20 to 50 times higher in an on state than a TFT using a-Si, and has excellent on characteristics. Therefore, it is easy to set the frame period to 16.7 ms or less, that is, the refresh rate to 60 Hz or more.

The display panels 2 included in the

display devices

1 and 1 ′ according to the first to fifth embodiments are smaller TFTs by using, for each pixel, a TFT using an oxide semiconductor having excellent on characteristics. Pixels can be driven. Thereby, the display panel 2 can reduce the proportion of the area occupied by the TFT in each pixel. That is, the aperture ratio in each pixel can be increased, and the backlight transmittance can be increased. As a result, a backlight with low power consumption can be adopted or the luminance of the backlight can be suppressed, so that power consumption can be reduced.

In addition, since the on-characteristics of the TFT are excellent, the electron mobility at the time of writing the source signal to each pixel can be increased and the time required for the writing can be further shortened. The period can be easily shortened (that is, the refresh rate can be easily increased).

In addition, as shown in FIG. 9, the TFT using an oxide semiconductor has a leakage current in an off state of about 1/100 that of a TFT using a-Si, and the leakage current hardly occurs. The off characteristics are very good. Thus, since the off characteristics are very excellent, it is easy to set the frame period to 33 ms or more, that is, the refresh rate to 30 Hz or less.

The display panel 2 according to the first to fifth embodiments employs a TFT using such an oxide semiconductor having excellent off characteristics for each pixel, whereby each source signal of a plurality of pixels included in the display panel 2 is used. Can be maintained for a long period of time, so that the frame period of the display panel 2 can be easily lengthened (that is, the refresh rate can be easily lowered).

[Additional matter 1]
Although the embodiments and the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

In the modification, the example in which the present invention is applied to a display device in which a TFT using an oxide semiconductor is adopted in each pixel has been described. The present invention can also be applied to a display device that employs other TFTs for each pixel, such as a TFT using a TFT.

[Additional matter 2]
As described above, the display device according to one embodiment of the present invention includes a plurality of gate lines, a plurality of data lines arranged to intersect the plurality of gate lines, and the plurality of gate lines and the plurality of gate lines. A display panel having a plurality of pixels defined by a data line, and a control unit that displays an image on the display panel while controlling the frame period with reference to frame period information, and the control unit includes: When the frame period indicated by the frame period information changes from the first frame period to the second frame period, the frame period is changed stepwise from the first frame period to the second frame period. It is characterized by that.

In the display device according to one aspect of the present invention, it is preferable that the frame cycle control unit changes the frame cycle stepwise in a range of 25 ms or more.

As a result, even when the frame period indicated by the frame period information changes sharply, the display device may give the user a visual discomfort due to the abrupt change of the frame period of the image displayed on the display panel. Can be reduced particularly when the frame period is changed to include a range of 25 ms or more, that is, a refresh rate of 40 Hz or less.

Since the human eye is likely to feel uncomfortable when the frame period is 25 ms or more, it is possible to efficiently reduce the uncomfortable feeling given to the user by changing the frame period stepwise in the range where the frame period is 25 ms or more. .

In the display device according to one aspect of the present invention, it is preferable that the frame period control unit changes the frame period stepwise within a range of 50 ms or less.

As a result, even when the frame period indicated by the frame period information changes abruptly, the display device may give the user a visually uncomfortable feeling due to the abrupt change of the frame period of the image displayed on the display panel. Can be reduced particularly when the frame period is changed to include a range of 50 ms or less, that is, the refresh rate includes a range of 20 Hz or more.

Since the human eye tends to feel uncomfortable when the frame period is 50 ms or less, it is possible to efficiently reduce the uncomfortable feeling given to the user by changing the frame period stepwise in the range where the frame period is 50 ms or less. .

Since the human eye is most likely to feel uncomfortable when the frame period is 25 ms or more and 50 ms or less, the user feels uncomfortable by changing the frame period stepwise in the range of the frame period of 25 ms or more and 50 ms or less. Furthermore, it can reduce efficiently.

The display device according to an aspect of the present invention further includes a frame memory that stores image data indicating an image displayed in the first frame period, and the control unit changes the frame period in stages. It is preferable that the image indicated by the image data stored in the frame memory is displayed for a predetermined number of frames during the period.

In the display device according to one aspect of the present invention, it is preferable that the control unit determines the predetermined number of frames with reference to the frame period information.

Further, in the display device according to one aspect of the present invention, the control unit is configured to display the first image when the image displayed in the first frame period is different from the image displayed in the second frame period. Delaying the storage timing of the image data indicating the image displayed in the frame period of 2 in the frame memory until the image data indicating the image displayed in the first frame period is displayed by a predetermined number of frames. Is preferred.

According to the above configuration, the display device is a frame memory that is displayed in the first frame period when the frame period indicated by the frame period signal changes sharply from the first frame period to the second frame period. The image indicated by the image data stored in is displayed for a predetermined number of frames in a period in which the frame period is changed stepwise (hereinafter also referred to as a transition period).

Accordingly, when an image displayed in the second frame period (also referred to as a second image) is different from an image displayed in the first frame period (also referred to as a first image). In the transition period, after the first image is displayed for a predetermined number of frames, the second image can be displayed. That is, in the transition period, the second image can be displayed following the display of the predetermined number of frames of the first image.

Therefore, since the image can be switched in the transition period, the frame period is prevented from changing sharply when switching from the first image to the second image, and the user feels visually uncomfortable. That can be reduced.

In the display device according to one embodiment of the present invention, each of the plurality of pixels preferably includes a TFT having a semiconductor layer made of an oxide semiconductor.

In the display device according to one embodiment of the present invention, the oxide semiconductor is preferably IGZO.

According to the above configuration, in the display device, the frame period, that is, the refresh rate is changed by adopting a TFT having a semiconductor layer made of an oxide semiconductor having excellent on characteristics and off characteristics for each pixel. It becomes easy to make.

In addition, as described above, the control device according to one aspect of the present invention includes a control unit that controls a frame period of an image displayed on the display panel, and the control unit sets the frame period to When changing from one frame period to a second frame period, the frame period is changed stepwise from the first frame period to the second frame period.

In addition, as described above, the electronic device according to one embodiment of the present invention includes a plurality of gate lines, a plurality of data lines arranged to intersect with the plurality of gate lines, the plurality of gate lines, and the An electronic apparatus comprising: a display device including a display panel having a plurality of pixels defined by a plurality of data lines; and a control device that controls a frame cycle of an image displayed on the display panel, wherein the frame cycle is Control means for changing the frame period stepwise from the first frame period to the second frame period when it changes from the first frame period to the second frame period; It is a feature.

The display device according to the present invention can be used in various display devices employing an active matrix method, such as a liquid crystal display device, an organic EL display device, and electronic paper.

DESCRIPTION OF SYMBOLS 1, 1 'Display apparatus 2 Display panel 4 Scan line drive circuit 6 Signal line drive circuit 8 Common electrode drive circuit 10, 10' Timing controller (control means)
12 Power supply circuit 15 Frame cycle control unit (control means)
20 Timing controller (control means)
25 Frame period controller (control means)
30, 30 'system side control unit (control device)
100, 200 electronic equipment

Claims

A display panel having a plurality of gate lines, a plurality of data lines arranged to intersect with the plurality of gate lines, and a plurality of pixels defined by the plurality of gate lines and the plurality of data lines;
Control means for displaying an image on the display panel while controlling the frame period with reference to the frame period information;
With
When the frame period indicated by the frame period information changes from the first frame period to the second frame period, the control means sets the frame period from the first frame period to the second frame period. Change in stages,
A display device characterized by that.
The control means changes the frame period stepwise in a range of 25 ms or more.
The display device according to claim 1.
The control means changes the frame period stepwise within a range of 50 ms or less.
The display device according to claim 1, wherein the display device is a display device.
A frame memory for storing image data indicating an image displayed in the first frame period;
The control means displays a predetermined number of frames of the image indicated by the image data stored in the frame memory in a period in which the frame period is changed stepwise;
The display device according to claim 1, wherein the display device is a display device.
The control means determines the predetermined number of frames with reference to the frame period information;
The display device according to claim 4.
The control means is configured to display image data indicating an image displayed in the second frame period when an image displayed in the first frame period is different from an image displayed in the second frame period. Is delayed until the image data indicating the image displayed in the first frame period is displayed for a predetermined number of frames.
The display device according to claim 5.
Each of the plurality of pixels includes a TFT having a semiconductor layer made of an oxide semiconductor.
The display device according to claim 1, wherein the display device is a display device.
The oxide semiconductor is IGZO.
The display device according to claim 7.
A control device comprising control means for controlling a frame period of an image to be displayed on a display panel,
The control means changes the frame period stepwise from the first frame period to the second frame period when changing the frame period from the first frame period to the second frame period. ,
A control device characterized by that.
A display panel having a plurality of gate lines, a plurality of data lines arranged so as to intersect with the plurality of gate lines, and a plurality of pixels defined by the plurality of gate lines and the plurality of data lines. A display device;
A control device for controlling a frame period of an image to be displayed on the display panel;
An electronic device comprising:
When the frame period changes from the first frame period to the second frame period, control means is provided for changing the frame period stepwise from the first frame period to the second frame period. Yes,
An electronic device characterized by that.