WO2012017640A1

WO2012017640A1 - Display device

Info

Publication number: WO2012017640A1
Application number: PCT/JP2011/004367
Authority: WO
Inventors: 松本　和也; 土居　康之
Original assignee: パナソニック株式会社
Priority date: 2010-08-04
Filing date: 2011-08-02
Publication date: 2012-02-09

Abstract

This display device, which is capable of suppressing heat generation and increased electrical consumption regardless of the drive method of a display panel, is provided with: a display panel (170) having a plurality of display elements (160) arranged in a matrix shape; a plurality of scanning signal lines (150) which are provided so as to correspond with the plurality of rows among the plurality of display elements (160), and which are for supplying scanning signals for controlling the plurality of display elements (160) in the corresponding row; a plurality of display data signal lines (140) which are provided so as to correspond with the plurality of rows among the plurality of display elements (160), and which are for supplying data signals for determining the light and darkness of each of the plurality of display elements (160) in the corresponding column; and a switch (180) which is provided in at least one display data signal line (140) among the plurality of display data signal lines (140), and which is for electrically cutting off part of the plurality of display elements (160).

Description

Display device

The present invention relates to a display device, and more particularly to a display device having a plurality of display elements arranged in a matrix.

In recent years, display devices such as liquid crystal displays have been increasingly increased in size and definition. In order to deal with these problems, 4K2K panels with an increased number of pixels, double-speed drive panels and quadruple-speed drive panels with increased drive frequency, and the like have been developed as panels constituting the display device. However, when the display device constitutes the panel, power consumption increases due to an increase in the number of display panel driving devices and an increase in driving frequency, and thus the heat generation problem has become prominent.

Hereinafter, a conventional display device will be described.

FIG. 14 is a diagram showing a configuration of a conventional display device. A display device 900 illustrated in FIG. 14 includes a drive device control circuit 910, a display panel drive device 920, a scanning line drive device 930, and a display panel 970. In the following, for convenience of explanation, in the conventional display device 900, four scanning signal lines, which are wirings for supplying the output of the scanning line driving device 930, are provided for supplying the output of the display panel driving device 920. A description will be given assuming that there are three display data signal lines as wiring.

The display panel driving device 920 is controlled by a first control signal 911 output from the driving device control circuit 910. The display panel drive device 920 includes drive circuits 921 (1) to 921 (3), a switch 980 (1), and a switch 980 (2). Here, the switch 980 (1) is for short-circuiting the outputs of the drive circuit 921 (1) and the drive circuit 921 (2). Similarly, the switch 980 (2) is for short-circuiting the outputs of the drive circuit 921 (2) and the drive circuit 921 (3). The scanning line driving device 930 is controlled by a second control signal 912 output from the driving device control circuit 910.

The display panel 970 is a liquid crystal display, for example, and includes display elements 960 (1) to 960 (12).

The display elements 960 (1) to 960 (12) are, for example, a plurality of liquid crystal elements, and display data signals 940 (1) to 940 (3) output from the display panel driving device 920 and scanning lines. Control is performed by scanning signals 950 (1) to 950 (4) output from the driving device 930.

Specifically, the display element 960 (1) to the display element 960 (4) respectively have a display data signal 940 (1) output from the display panel driving device 920 and a scanning signal 950 output from the scanning line driving device 930. (1) to 950 (4). Similarly, the display element 960 (5) to the display element 960 (8) have a display data signal 940 (2) output from the display panel driving device 920 and a scanning signal 950 (1) output from the scanning line driving device 930, respectively. ) To 950 (4). In addition, the display element 960 (9) to the display element 960 (12) have a display data signal 940 (3) output from the display panel driving device 920 and a scanning signal 950 (1) output from the scanning line driving device 930, respectively. Controlled by ˜950 (4).

Next, the operation of the display device 900 configured as described above will be described.

The scanning line driving device 930 sequentially outputs the scanning signals 950 (1) to 950 (4).

For example, when the scanning signal 950 (1) is enabled, the display data signal 940 (1) to the display data signal 940 (3) are output, and the display element 960 (1), the display element 960 (5), and the display element A grayscale voltage (display data signal) is supplied to each of 960 (9). Similarly, when the scanning signal 950 (2) is enabled, the display data signal 940 (1) to the display data signal 940 (3) are output, and the display element 960 (2), the display element 960 (6), and A gradation voltage (display data signal) is supplied to each of the display elements 960 (10). Further, when the scanning signal 950 (3) is in an enable state, the display data signal 940 (1) to the display data signal 940 (3) are output, and the display element 960 (3), the display element 960 (7), and the display element are output. A gradation voltage (display data signal) is supplied to each of 960 (11). When the scanning signal 950 (4) is enabled, the display data signal 940 (1) to the display data signal 940 (3) are output, and the display element 960 (4), the display element 960 (8), and the display element 960 (12). ) Is supplied with a gradation voltage (display data signal).

By controlling the display elements 960 (1) to 960 (12) as described above, the display panel 970 can display a desired picture.

As described above, when the display panel 970 is, for example, a liquid crystal display, the display panel 970 converts the output from the display panel driving device 920, that is, the outputs of the driving circuits 921 (1) to 921 (3) to DC. When driven at, the display elements 960 (1) to 960 (12) are burned and the life is shortened. Therefore, the output of the drive circuits 921 (1) to (3) is mainly driven by alternating current.

Also known as a driving method are a dot inversion driving method and a row line inversion driving method. For example, when the display panel 970 is driven by the dot inversion driving method, the display panel 970 sets a voltage applied to every other display element 960 for each frame period to a higher potential than the staggered reference potential (hereinafter, referred to as a reference potential). Driving is divided into positive polarity and low potential (hereinafter negative polarity). On the other hand, when the display panel 970 is driven by the row line inversion driving method, the display panel 970 drives the display elements 960 in the row direction alternately for each frame separately for positive polarity and negative polarity.

Further, when the display panel 970 is driven by the dot inversion driving method, the output of the adjacent driving circuit 921 alternately outputs positive polarity and negative polarity. Therefore, by short-circuiting the outputs of the drive circuit 921 with the switch 980, charges can be collected and power consumption can be reduced.

JP 2009-258288 A

However, when the display panel 970 is driven by the row line inversion driving method, the outputs of the adjacent driving circuits 921 continue to have the same polarity in the column direction, so the outputs of the driving circuits 921 are short-circuited by the switch 980. If this happens, the charge cannot be recovered. Therefore, power consumption increases conversely.

That is, the conventional display device 900 shown in FIG. 14 has a problem that charge cannot be collected depending on the driving method, and heat generation cannot be suppressed.

Furthermore, there is a situation that the power consumption that increases with the increase in size and speed of display panels in recent years and the heat generation problem caused by this increase cannot be suppressed by conventional charge recovery technology alone.

Therefore, the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a display device that can suppress an increase in power consumption and heat generation regardless of a display panel driving method.

In order to achieve the above object, a display device according to one embodiment of the present invention includes a display panel including a plurality of display elements arranged in a matrix and a plurality of rows of the plurality of display elements. A plurality of scanning lines for supplying scanning signals for controlling a plurality of display elements in a corresponding row, and a plurality of columns in the plurality of display elements, and a plurality of scanning lines in the corresponding columns. A plurality of data signal lines for supplying a data signal for determining brightness of each display element; and at least one data signal line among the plurality of data signal lines, wherein a part of the plurality of display elements is A switch for electrically disconnecting from the other part of the plurality of display elements.

According to such a configuration, it is possible to reduce the parasitic capacitance (for example, the wiring capacitance, the capacitance of the display element) in the display data signal line by performing on / off control of the switch in time series. Accordingly, it is possible to reduce the power consumption of the display panel driving device that drives the display panel, and it is possible to reduce the heat generation.

Here, the switch may be formed in the display panel.

In addition, the display device may further include a data line driving device that generates the data signal to be supplied to the plurality of data signal lines, and the switch may be formed in the data line driving device.

Further, at least one switch may be provided for each of the plurality of data signal lines.

Further, one switch may be provided for each of the plurality of data signal lines, and may be provided at a position that bisects the plurality of display elements in the corresponding column.

This configuration makes it possible to further reduce heat generation.

Further, a plurality of the switches may be provided for each of the plurality of data signal lines, and may be provided at all corresponding positions between adjacent display elements in a corresponding column.

In addition, a plurality of the switches are provided for each of the plurality of data signal lines, and are provided at corresponding positions between the plurality of display elements in the corresponding column, and are provided for each of the plurality of data signal lines. The number of the switches may be different between adjacent data signal lines.

This configuration can prevent switches from being crowded. Accordingly, display unevenness due to heat generated by the resistance component of the switch itself due to the denseness of the switch can be prevented.

The display device further includes a data line driving device for generating the data signal to be supplied to the plurality of data signal lines, and the plurality of data signal lines are respectively a first branch data signal line and a second branch. Data signal lines, the plurality of data signal lines are branched into the first branch data signal line and the second branch data signal line, and each of the first branch data signal lines includes the plurality of display elements. The second branch data signal lines are provided corresponding to the remaining portions of the plurality of rows of the plurality of display elements, respectively, and the switch is provided so as to correspond to a part of the plurality of rows. One may be provided for each of the first branch data signal lines and each of the second branch data signal lines.

Here, the plurality of data signal lines are branched into the first branch data signal line and the second branch data signal line in the data line driving device, and the switch is provided in the data line driving device. A part of a plurality of rows of the plurality of display elements corresponding to the first branch data signal line, or a plurality of rows of the plurality of display elements corresponding to the second branch data signal line. The remaining portion may be electrically separated.

According to such a configuration, it is possible to avoid a case where wiring from the scanning line driving device is to be gathered in one place, and a parallel running with a scanning signal for controlling the display element.

Further, the data line driving device includes a plurality of driving circuits for supplying the data signals to the corresponding data signal lines, and for supplying a control signal for controlling the driving circuit to the plurality of driving circuits. The control lines may be connected, and the plurality of drive circuits may have current capabilities adjusted by the control signal.

According to this configuration, when the switch is controlled in time series, even if the load capacity of the drive circuit varies, the current capability of the drive circuit can be varied according to the variation. Thereby, the power consumption can be further reduced.

The display device further includes a scanning line driving device that generates the scanning signal to be supplied to the plurality of scanning signal lines and generates a switch control signal for controlling the switch. It may be controlled on or off by the switch control signal. In addition, the display device further includes a data line driving device that generates the data signal to be supplied to the plurality of data signal lines and generates a switch control signal for controlling the switch. It may be controlled on or off by the switch control signal. Of course, the display device further includes a scanning line driving device that generates the scanning signals to be supplied to the plurality of scanning signal lines, and a data line driving device that generates the data signals to be supplied to the plurality of data signal lines. And a drive device control circuit that generates a switch control signal for controlling the switch, and the switch may be controlled to be turned on or off by the switch control signal.

As in these configurations, the switch may not be arranged on the display panel. As a result, the existing scanning line driving device, the existing data line driving device, and the existing driving device control circuit can be used as components constituting the display device, which is cost-effective.

This allows the switch to be arranged not only on the display panel but also on external parts, as well as flexibly responding to adjustment of the current capacity and shape change of the switch.

Further, for example, when the switch is formed in the data line driving device, there is an effect that the mobility of the transistors constituting the switch can be formed much higher than when the switch is formed in the display panel.

Note that the present invention may be realized not only as an apparatus but also as an integrated circuit including processing means included in such an apparatus.

According to the present invention, it is possible to realize a display device that can suppress an increase in power consumption and heat generation regardless of the display panel driving method. Specifically, by reducing the capacity driven by the display panel drive device included in the display device in a time-sharing manner, power consumption can be reduced and heat generation can be reduced.

FIG. 1 is a diagram illustrating a configuration of a display device according to Embodiment 1. FIG. 2 is a timing chart for explaining the operation of the display device in the first embodiment. FIG. 3 is a diagram illustrating a configuration of the display device according to the first modification of the first embodiment. FIG. 4 is a diagram illustrating a configuration of a display device according to the second modification of the first embodiment. FIG. 5 is a diagram illustrating a configuration of the display device according to the second embodiment. FIG. 6 is a timing chart for explaining the operation of the display device in the second embodiment. FIG. 7 is a diagram illustrating a configuration of a display device according to the first modification of the second embodiment. FIG. 8A is a timing chart for explaining the operation of the display device in the first modification of the second embodiment. FIG. 8B is a timing chart for explaining the operation of the display device in the first modification of the second embodiment. FIG. 9 is a diagram illustrating a configuration of a display device according to Embodiment 3. FIG. 10 is a timing chart for explaining the operation of the display device in the third embodiment. FIG. 11 is a diagram illustrating a configuration of the display device according to the fourth embodiment. FIG. 12 is a timing chart for explaining the operation of the display device in the fourth embodiment. FIG. 13 is a diagram illustrating a configuration of a display device according to the first modification of the fourth embodiment. FIG. 14 is a diagram illustrating a configuration of a display device according to the related art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example, and various modifications can be made.

(Embodiment 1)
FIG. 1 is a diagram illustrating a configuration of a display device according to Embodiment 1. The display device 100 shown in FIG. 1 includes a drive device control circuit 110, a display panel drive device 120, a scanning line drive device 130, and a display panel 170. Further, the display device 100 includes display data signal lines 140 and scanning signal lines 150. In the following, for convenience of explanation, four scanning signal lines 150 which are wirings for supplying the output of the scanning line driving device 130 and display data signals which are wirings for supplying the output of the display panel driving device 120 are shown. A description will be given assuming that there are three lines 140.

The display panel driving device 120 is controlled by a first control signal 111 output from the driving device control circuit 110. The display panel driving device 120 is connected to the display data signal line 140 (1) to the display data signal line 140 (3), and the display data signal that determines the brightness of the corresponding display element 160 (1) to the display element 160 (12). Are output to the display data signal line 140 (1) to the display data signal line 140 (3), respectively.

The scanning line driving device 130 is controlled by the second control signal 112 output from the driving device control circuit 110. The scanning line driving device 130 is connected to the scanning signal lines 150 (1) to 150 (4), and controls the corresponding display elements 160 (1) to 160 (12) to be turned on or off. A scanning signal (control signal) is output to each of the scanning signal lines 150 (1) to 150 (4). The scanning line driving device 130 outputs a switch control signal 190 for controlling the switches 180 (1) to 180 (3) to be turned on or off.

The display panel 170 is a liquid crystal display, for example, and has a plurality of display elements arranged in a matrix. More specifically, the display panel 170 includes display elements 160 (1) to 160 (12) and switches 180 (1) to 180 (3).

The display data signal line 140 is provided corresponding to a plurality of columns of the plurality of display elements 160, and a data signal for determining the brightness of each of the plurality of display elements 160 in the corresponding column among the plurality of display elements 160. Wiring for supplying. The display data signal line 140 is also a wiring for supplying the output of the display panel driving device 120.

The scanning signal line 150 is provided corresponding to a plurality of rows of the plurality of display elements 160, and supplies a scanning signal for controlling the plurality of display elements 160 in the corresponding row of the plurality of display elements 160. Wiring. The scanning signal line 150 is also a wiring for supplying the output of the scanning line driving device 130.

The display elements 160 (1) to 160 (12) are, for example, a plurality of liquid crystal elements, and are output from the display panel driving device 120 to the display data signal line 140 (1) to the display data signal line 140 (3). The display data signal and the scanning signal output from the scanning line driver 130 to the scanning signal line 150 (1) to the scanning signal line 150 (4) are controlled.

Specifically, the display element 160 (1) to the display element 160 (4) respectively scan the display data signal output from the display panel driving device 120 to the display data signal line 140 (1) and the scanning line driving device 130. It is controlled by the scanning signal output to the signal line 150 (1) to the scanning signal line 150 (4). Similarly, the display element 160 (5) to the display element 160 (8) respectively include a display data signal output from the display panel driving device 120 to the display data signal line 140 (2) and a scanning signal line from the scanning line driving device 130. 150 (1) to scanning signal line 150 (4). The display element 160 (9) to the display element 160 (12) respectively display the display data signal output from the display panel driving device 120 to the display data signal line 140 (3) and the scanning signal line 150 (1) from the scanning line driving device 130. To the scanning signal line 150 (4).

The switches 180 (1) to 180 (3) are provided on at least one display data signal line 140 among the plurality of display data signal lines 140, and a part of the plurality of display elements 160 is connected to the plurality of display elements 160. It is for electrically separating from other parts. Specifically, the switches 180 (1) to 180 (3) are provided on the display data signal lines 140 (1) to 140 (3), respectively, and the display data signal lines 140 (1). The display data signal lines 140 (3) are electrically disconnected from each other. The switches 180 (1) to 180 (3) are controlled to be turned on or off by a switch control signal 190 (third control signal) output from the scanning line driving device 130. For example, when the switches 180 (1) to 180 (3) are turned off, the display data signal is not supplied to the display element 160 connected to the electrically disconnected display data signal line 140. The display data signal is supplied to the display element 160 connected to the display data signal portion that is not electrically disconnected.

Specifically, when the switch 180 (1) is controlled to be turned off, the display data signal line 140 (1) to which the display element 160 (3) and the display element 160 (4) are connected, and the display element 160 ( 1) and the display data signal line 140 (1) to which the display element 160 (2) is connected are electrically disconnected. Therefore, the display data signal is not supplied to the display element 160 (3) and the display element 160 (4).

Similarly, when the switch 180 (2) is controlled to be turned off, the display data signal line 140 (2) to which the display element 160 (7) and the display element 160 (8) are connected, and the display element 160 (5). The display data signal line 140 (2) to which the display element 160 (6) is connected is electrically disconnected. Therefore, the display data signal is not supplied to the display element 160 (7) and the display element 160 (8).

Similarly, when the switch 180 (3) is turned off, the display data signal is supplied to the display element 160 (9) and the display element 160 (10), but the display element 160 (11) and the display element are displayed. It is not supplied to the element 160 (12).

The switches 180 (1) to 180 (3) are formed of, for example, amorphous silicon TFT, LTPS-TFT (Low Temperature Polycrystalline Silicon TFT), or HTPS-TFT (High Temperature Polyline Silicon TFT).

Next, the operation of the display device 100 configured as described above will be described.

FIG. 2 is a timing chart for explaining the operation of the display device according to the first embodiment.

As shown in FIGS. 2A to 2D, the scanning line driving device 130 sequentially applies scanning signals indicating enable states to the scanning signal lines 150 (1) to 150 (4). Suppose that it outputs. Note that the scanning signal indicating the enabled state turns on the corresponding display elements 160 (1) to 160 (12).

Specifically, as shown in FIG. 2A, for example, during the period from time t1 to time t2, the scanning signal in the enabled state is output to the scanning signal line 150 (1) by the scanning line driving device 130. At this time, since the display data signal is output to the display data signal line 140 (1) to the display data signal line 140 (3) by the display panel driving device 120, the display element 160 (1) and the display element 160 (5 ), A gradation voltage (display data signal) that determines the degree of lightness and darkness is supplied to each display element 160 (9).

Next, as shown in FIG. 2B, for example, between time t2 and time t3, the scanning line driving device 130 outputs the scanning signal in the enabled state to the scanning signal line 150 (2). At this time, since the display data signal is output to the display data signal lines 140 (1) to 140 (3) by the display panel driving device 120, the display elements 160 (2) and 160 (6) ), A gradation voltage (display data signal) is supplied to each of the display elements 160 (10).

Next, as shown in FIG. 2C, for example, during time t3 to time t4, the scanning line driving device 130 outputs the scanning signal in the enabled state to the scanning signal line 150 (3). At this time, since the display data signal is output to the display data signal line 140 (1) to the display data signal line 140 (3) by the display panel driving device 120, the display element 160 (3) and the display element 160 (7 ), A gradation voltage (display data signal) is supplied to each of the display elements 160 (11).

Next, as shown in FIG. 2D, for example, during time t4 to time t5, the scanning line driving device 130 outputs the scanning signal in the enabled state to the scanning signal line 150 (4). At this time, since the display data signal is output to the display data signal line 140 (1) to the display data signal line 140 (3) by the display panel driving device 120, the display element 160 (4) and the display element 160 (8 ), A gradation voltage (display data signal) is supplied to each of the display elements 160 (12).

By repeating such an operation every frame, for example, a picture can be displayed on the display panel 170.

Here, as shown in FIG. 2E, scanning line driving is performed until a scanning signal in an enabled state is output to the scanning signal line 150 (3) (from time t1 to time t3, from time t5 to time t7). The switch control signal 190 output by the device 130 is in a disabled state. In other words, the switches 180 (1) to 180 (3) are enabled until a scanning signal in an enabled state is output to the scanning signal line 150 (3) (between time t1 and time t3, between time t5 and time t7). In a disabled state (non-conducting state, off state). Therefore, the display data signal line 140 (1) to the display data signal line 140 (3) are connected to the display element 160 (3) and the display element 160 from time t1 to time t3 (and from time t5 to time t7). (4) The display element 160 (7), the display element 160 (8), the display element 160 (11), and the display element 160 (12) are not connected. Accordingly, the wiring capacitance added to the display data signal line 140 (1) to the display data signal line 140 (3) can be reduced between the time t1 and the time t3 and between the time t5 and the time t7. .

Thus, the wiring capacity added to the display data signal line 140 (1) to the display data signal line 140 (3) can be reduced in time series. Accordingly, the display device 100 in this embodiment can reduce power consumption and can realize low heat generation. In addition, by realizing low power consumption, it is possible to realize low EMI at the same time.

As described above, according to the first embodiment, it is possible to realize a display device that can suppress an increase in power consumption and heat generation regardless of a display panel driving method.

(Modification 1)
FIG. 3 is a diagram illustrating a configuration of the display device according to the first modification of the first embodiment. The display device 200 shown in FIG. 3 includes a drive device control circuit 110, a display panel drive device 220, a scanning line drive device 230, and a display panel 270. Elements similar to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

3 is different from the display device 100 according to the first embodiment in the configuration of a display panel driving device 220, a scanning line driving device 230, and a display panel 270. In other words, this display device 200 is characterized in that a switch control signal 290 for controlling the switches 180 (1) to 180 (3) is output from the display panel driving device 220 instead of the scanning line driving device 230. This is different from the first embodiment. About another structure, it is the structure similar to the display apparatus 100 which concerns on Embodiment 1. FIG. Since the operation is the same as that of the display device 100 according to the first embodiment, the description thereof is omitted.

According to such a configuration, not only the same effect as in the first embodiment can be obtained, but also the existing scanning line driving device can be used, so that there is an advantage in terms of cost merit.

(Modification 2)
FIG. 4 is a diagram illustrating a configuration of a display device according to the second modification of the first embodiment. A display device 300 illustrated in FIG. 4 includes a drive device control circuit 310, a display panel drive device 120, a scanning line drive device 230, and a display panel 370. Elements similar to those in FIGS. 1 and 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

4 is different from the display device 100 according to the first embodiment in the configuration of a scanning line driving device 230, a driving device control circuit 310, and a display panel 370. In other words, this display device 300 is characterized in that a switch control signal 390 for controlling the switches 180 (1) to 180 (3) is output from the drive device control circuit 310 instead of the scanning line drive device 230. This is different from the first embodiment. Other configurations are substantially the same as those of the display device 100 according to the first embodiment, and the scanning line driving device 230 has the same configuration as that described in the second modification, and thus description thereof is omitted. Since the operation is the same as that of the display device 100 according to the first embodiment, the description thereof is omitted.

Such a configuration not only provides the same effects as those of the first embodiment, but also has an advantage in mounting that an existing scanning line driving device and display panel driving device can be used.

Note that the switch control signal for controlling the switches 180 (1) to 180 (3) may be output from any of the driving device control circuit, the display panel driving device, and the scanning line driving device. As a result, the existing drive device control circuit, the existing display panel drive device, or the existing scan line drive device can be used (applied) as desired, so that the manufacturing cost can be further reduced.

(Embodiment 2)
In the second embodiment, a case will be described in which the same number of the switches are arranged for the same display data signal line.

FIG. 5 is a diagram illustrating a configuration of the display device according to the second embodiment. Elements similar to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The display device 400 shown in FIG. 5 includes a drive device control circuit 110, a display panel drive device 120, a scanning line drive device 430, and a display panel 470.

5 differs from the display device 100 according to the first embodiment in the configuration of the scanning line driving device 430 and the display panel 470.

The scanning line driving device 430 is controlled by the second control signal 112 output from the driving device control circuit 110 similarly to the scanning line driving device 130. The scanning line driving device 430 is connected to the scanning signal lines 150 (1) to 150 (4) and controls the corresponding display elements 160 (1) to 160 (12) to be turned on or off. A scanning signal (control signal) is output to each of the scanning signal lines 150 (1) to 150 (4). Further, the scanning line driver 430 receives switch control signals 490 (1) to 490 (3) for controlling the switches 480 (1) to 480 (9) of the display panel 470 to be turned on or off. Output.

The display panel 470 is a liquid crystal display, for example, and includes display elements 160 (1) to 160 (12) and switches 480 (1) to 480 (9). Note that the display panel 470 differs from the display panel 170 according to Embodiment 1 in the configuration of the switches 480 (1) to 480 (9).

The display elements 160 (1) to 160 (12) are, for example, a plurality of liquid crystal elements, and are output from the display panel driving device 120 to the display data signal line 140 (1) to the display data signal line 140 (3). The display data signal and the scanning signal output from the scanning line driver 430 to the scanning signal lines 150 (1) to 150 (4) are controlled.

Note that details are the same as in the case of the display panel 170, and thus description thereof is omitted.

A plurality of switches 480 (1) to 480 (9) are provided on display data signal lines 140 (1) to 140 (3), respectively, and between adjacent display elements in the corresponding column. It is provided at all positions corresponding to. The switches 480 (1) to 480 (9) are electrically connected to a part of the display elements 160 (1) to 160 (12) from the other parts of the plurality of display elements 160 (1) to 160 (12). It is intended for separation. The switches 480 (1) to 480 (9) are controlled to be turned on or off by a switch control signal 490 (third control signal) output from the scanning line driving device 430.

Specifically, the switch 480 (1) is provided between the display element 160 (1) and the display element 160 (2), and electrically disconnects the display data signal line 140 (1) between them. It is a switch. The switch 480 (2) is provided between the display element 160 (2) and the display element 160 (3), and is a switch for electrically disconnecting the display data signal line 140 (1) therebetween. Similarly, the switch 480 (3) is provided between the display element 160 (3) and the display element 160 (4), and is a switch for electrically disconnecting the display data signal line 140 (1) therebetween. is there.

The switch 480 (4) is provided between the display element 160 (5) and the display element 160 (6), and is a switch for electrically disconnecting the display data signal line 140 (2) between them. is there. The switch 480 (5) is provided between the display element 160 (6) and the display element 160 (7), and is a switch for electrically disconnecting the display data signal line 140 (2) between them. Similarly, the switch 480 (6) is provided between the display element 160 (7) and the display element 160 (8), and is a switch for electrically disconnecting the display data signal line 140 (2) therebetween. It is.

The switch 480 (7) is provided between the display element 160 (9) and the display element 160 (10), and is a switch for electrically disconnecting the display data signal line 140 (3) between them. is there. The switch 480 (8) is provided between the display element 160 (10) and the display element 160 (11), and is a switch for electrically disconnecting the display data signal line 140 (3) between them. Similarly, the switch 480 (9) is provided between the display element 160 (11) and the display element 160 (12), and is a switch for electrically disconnecting the display data signal line 140 (3) therebetween. It is.

Here, the switch 480 (1), the switch 480 (4), and the switch 480 (7) are controlled to be turned on or off by a switch control signal 490 (1) output from the scanning line driving device 430. The switch 480 (2), the switch 480 (5), and the switch 480 (8) are controlled to be turned on or off by a switch control signal 490 (2) output from the scanning line driving device 430. Similarly, the switch 480 (3), the switch 480 (6), and the switch 480 (9) are controlled to be turned on or off by a switch control signal 490 (3) output from the scanning line driving device 430.

Next, the operation of the display device 400 configured as described above will be described.

FIG. 6 is a timing chart for explaining the operation of the display device according to the second embodiment. Elements similar to those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIGS. 6A to 6D, the scanning line driving device 430 sequentially applies scanning signals indicating enable states to the scanning signal lines 150 (1) to 150 (4). Output. The operations shown in FIGS. 6 (a) to 6 (d) are the same as the operations in FIGS. 2 (a) to 2 (d) described above, and thus the description thereof will be omitted. Different operations will be described.

First, as shown in FIG. 6E, until a scanning signal in an enabled state is output to the scanning signal line 150 (2) (from time t1 to time t2, from time t5 to time t6), the scanning line driving device. The switch control signal 490 (1) output by 430 is in a disabled state. That is, the switch 480 (1), the switch 480 (4), and the switch 480 (7) are in the time period until the scan signal in the enabled state is output to the scan signal line 150 (2) (between time t1 and time t2). During the period from t5 to time t6), it is disabled. Therefore, the display data signal line 140 (1) to the display data signal line 140 (3) are connected to the display element 160 (2) to the display element 160 from the time t1 to the time t2 (and from the time t5 to the time t6). (4) The display elements 160 (6) to 160 (8) and the display elements 160 (10) to 160 (12) are not electrically connected. Thereby, the wiring capacity added to the display data signal line 140 (1) to the display data signal line 140 (3) can be reduced between the time t1 and the time t2 and between the time t5 and the time t6. .

Further, as shown in FIG. 6 (f), until the scanning signal in the enabled state is output to the scanning signal line 150 (3) (from time t1 to time t3, from time t5 to time t7), the scanning line driving device. The switch control signal 490 (2) output by 430 is in a disabled state. In other words, the switch 480 (2), the switch 480 (5), and the switch 480 (8) are in the time t5 until the scan signal in the enabled state is output to the scan signal line 150 (3) (from time t1 to time t3). From time t7 to time t7). Therefore, the display data signal line 140 (1) to the display data signal line 140 (3) are connected to the display element 160 (3) and the display element 160 from time t2 to time t3 (and from time t6 to time t7). (4) The display element 160 (7), the display element 160 (8), the display element 160 (11), and the display element 160 (12) are not electrically connected. Accordingly, the wiring capacitance added to the display data signal line 140 (1) to the display data signal line 140 (3) can be reduced between the time t2 and the time t3 and between the time t6 and the time t7. .

Further, as shown in FIG. 6G, until the scanning signal in the enabled state is output to the scanning signal line 150 (4) (from time t1 to time 4, from time t5 to time t8), the scanning line The switch control signal 490 (3) output by the driving device 430 is in a disabled state. In other words, the switch 480 (3), the switch 480 (6), and the switch 480 (9) are switched from the time t1 to the time t4 until the scanning signal in the enabled state is output to the scanning signal line 150 (4). From time t8 to time t8). Therefore, the display data signal line 140 (1) to the display data signal line 140 (3) are connected to the display element 160 (4) and the display element 160 from time t3 to time t4 (and from time t7 to time t8). (8) The display element 160 (12) is not electrically connected. Thereby, the wiring capacitance added to the display data signal line 140 (1) to the display data signal line 140 (3) can be reduced between the time t3 and the time t4 and between the time t7 and the time t8. .

Thus, the wiring capacity added to the display data signal line 140 (1) to the display data signal line 140 (3) can be reduced in time series. As a result, the power consumption can be reduced more than that of the display device in Embodiment 1, and the heat generation can be reduced.

As described above, according to the second embodiment, it is possible to realize a display device capable of suppressing an increase in power consumption and heat generation regardless of a display panel driving method.

In this embodiment, the switch control signal for controlling the switches 480 (1) to 480 (9) has been described as being output from the scanning line driving device, but the present invention is not limited to this. Similarly to the first embodiment, the output may be output from either the driving device control circuit or the display panel driving device scanning line driving device.

In this embodiment, when switch 480 (1) to switch 480 (9) are controlled by switch control signal 490 (1), switch control signal 490 (2), and switch control signal 490 (3). Although explained, it is not limited to this. For example, the switches 480 (1) to 480 (9) may be individually controlled by increasing the number of switch control signals.

(Modification 1)
FIG. 7 is a diagram illustrating a configuration of a display device according to the first modification of the second embodiment. A display device 500 illustrated in FIG. 7 includes a driving device control circuit 110, a display panel driving device 120, a scanning line driving device 430, and a display panel 570. The same elements as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

7 is different from the display device 400 of the second embodiment in the configuration of the display panel 570. Specifically, the number of switches 480 constituting the display panel 570 is different, and the switch 480 (2), the switch 480 (4), the switch 480 (6), and the switch 480 (8) included in the display panel 470 are provided. The configuration has been deleted.

In other words, a plurality of switches 480 are provided for each of the plurality of display data signal lines 140 and are provided at corresponding positions between the plurality of display elements 160 in the corresponding column. Further, the number of switches 480 is different between adjacent display data signal lines 140.

8A and 8B are timing charts for explaining the operation of the display device in the first modification of the second embodiment. FIG. 8A shows the switches 480 (1), 480 (3), 480 (7), and 480 (9) connected to the display data signal line 140 (1) and the display data signal line 140 (3). Shows control. On the other hand, FIG. 8B shows control for the switch 480 (5) connected to the display data signal line 140 (2). In addition, the same code | symbol is attached | subjected to the element similar to FIG.

As shown in FIGS. 8A and 8B, the scanning line driving device 430 sequentially outputs scanning signals indicating the enable state to the scanning signal lines 150 (1) to 150 (4). Since this operation is the same as that in FIGS. 6A to 6D, detailed description thereof is omitted.

Next, first, as shown in FIG. 8A (e), until an enabled scanning signal is output to the scanning signal line 150 (2) (from time t1 to time t2, from time t5 to time t6), The switch control signal 490 (1) output by the scanning line driving device 430 is in a disabled state. That is, the switch 480 (1) and the switch 480 (7) are operated until the scanning signal in the enabled state is output to the scanning signal line 150 (2) (between time t1 and time t2, between time t5 and time t6). ), Disabled. Therefore, the display data signal line 140 (1) and the display data signal line 140 (3) are connected to the display element 160 (2) to the display element 160 between the time t1 and the time t2 (and between the time t5 and the time t6). (4) The display elements 160 (10) to 160 (12) are not electrically connected. Thereby, the wiring capacitance added to the display data signal line 140 (1) and the display data signal line 140 (3) can be reduced between the time t1 and the time t2 and between the time t5 and the time t6. .

Further, as shown in (g) of FIG. 8A, scanning line driving is performed until an enabled scanning signal is output to the scanning signal line 150 (4) (from time t1 to time 4, from time t5 to time t8). The switch control signal 490 (3) output by the device 430 is in a disabled state. In other words, the switch 480 (3) and the switch 480 (9) are in effect until the scanning signal in the enabled state is output to the scanning signal line 150 (4) (from time t1 to time t4, from time t5 to time t8). Disabled. Therefore, the display data signal line 140 (1) and the display data signal line 140 (3) include a display element 160 (4), a display element 160 (4), and a display element 160 (4) between the time t1 and time t4 (and between time t5 and time t8). 160 (12) is not electrically connected. Thereby, the wiring capacitance added to the display data signal line 140 (1) and the display data signal line 140 (3) is reduced between the time t2 and the time t4 and between the time t6 and the time t8. be able to.

On the other hand, as shown in FIG. 8B (f), scanning line driving is performed until a scanning signal in an enabled state is output to the scanning signal line 150 (3) (from time t1 to time t3, from time t5 to time t7). Switch control signal 490 (2) output by device 430 is disabled. In other words, the switch 480 (5) is disabled until an enabled scanning signal is output to the scanning signal line 150 (3) (from time t1 to time t3, from time t5 to time t7). . Therefore, the display element 160 (7) and the display element 160 (8) are electrically connected to the display data signal line 140 (2) between time t1 and time t3 (and between time t5 and time t7). Not. Accordingly, the wiring capacitance added to the display data signal line 140 (2) can be reduced between the time t1 and the time t3 and between the time t5 and the time t7.

Thus, the wiring capacity added to the display data signal line 140 (1) to the display data signal line 140 (3) can be reduced in time series.

As described above, according to the present modification, the display panel 570 has an effect that it is possible to avoid the possibility that the display unevenness occurs only at a place where the switches 480 are densely arranged.

This is because the switch 480 generates heat due to its own resistance component. If there is a place where the switches 480 are densely packed, it may be recognized as display unevenness on the display panel due to heat. However, as in this configuration, for example, as in the configuration in which the switches 480 are thinned out as described above, the number and height of each display data signal line are adjusted to concentrate heat on the display panel 570. Can be prevented. This can prevent the display panel 570 from being recognized as display unevenness.

In this modification, the display panel 570 is configured by deleting the switch 480 (2), the switch 480 (4), the switch 480 (6), and the switch 480 (8). . It goes without saying that various patterns that can prevent heat concentration on the display panel 570 are conceivable.

(Embodiment 3)
FIG. 9 is a diagram illustrating a configuration of a display device according to Embodiment 3. Elements similar to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The display device 600 shown in FIG. 9 includes a drive device control circuit 110, a display panel drive device 620, a scanning line drive device 630, and a display panel 670.

9 is different from the display device 100 according to Embodiment 1 in the configuration of a display panel driving device 620, a scanning line driving device 630, and a display panel 670.

The display panel driving device 620 is controlled by the first control signal 111 output from the driving device control circuit 110. Further, as shown in FIG. 9, the display panel driving device 620 includes driving circuits 621 (1) to 621 (3), and each of the driving circuits 621 (1) to 621 (3) and display data. The signal line 640 (A) to the display data signal line 640 (C) are connected. Then, the driver circuits 621 (1) to 621 (3) are connected to the corresponding display data signal lines 640 (1) to 640 (3), respectively, and the display elements 160 (1) to 160 ( 12) A display data signal for determining light and dark is output. As shown in FIG. 9, the display data signal line 640 (A) is branched on the display panel 670 into a display data signal line 640 (1) and a display data signal line 640 (2). Similarly, the display data signal line 640 (B) is branched into a display data signal line 640 (3) and a display data signal line 640 (4). The display data signal line 640 (C) is branched into a display data signal line 640 (5) and a display data signal line 640 (6).

The scanning line driving device 630 is controlled by the second control signal 112 output from the driving device control circuit 110 similarly to the scanning line driving device 130. The scan line driver 630 is connected to the scan signal lines 150 (1) to 150 (4) and outputs a scan signal to each of the scan signal lines 150 (1) to 150 (4). Further, the scanning line driving device 630 outputs a switch control signal 690 for controlling the switches 680 (1) to 680 (6) to be on or off.

The display panel 670 is, for example, a liquid crystal display, and includes display elements 160 (1) to 160 (12) and switches 680 (1) to 680 (6).

The display elements 160 (1) to 160 (12) are, for example, a plurality of liquid crystal elements, and display is performed from the display panel driving device 620 via the display data signal lines 640 (A) to 640 (C). Display data signals output to the data signal line 640 (1) to the display data signal line 640 (6) and output from the scanning line driver 630 to the scanning signal line 150 (1) to the scanning signal line 150 (4). It is controlled by the scanning signal. Note that the display data signal line 640 (1) to the display data signal line 640 (6) are provided corresponding to a part of a plurality of columns of the plurality of display elements 160, respectively.

Specifically, the display element 160 (1) and the display element 160 (2) are output from the driver circuit 621 (1) to the display data signal line 640 (1) through the display data signal line 640 (A). The display data signal and the scanning signal output from the scanning line driver 630 to the scanning signal line 150 (1) and the scanning signal line 150 (2) are controlled. The display element 160 (3) and the display element 160 (4) are a display data signal output from the driver circuit 621 (1) to the display data signal line 640 (2) via the display data signal line 640 (A). The scanning signal is controlled by the scanning signal line 150 (3) and the scanning signal output from the scanning line driver 630 to the scanning signal line 150 (4).

Similarly, the display element 160 (5) and the display element 160 (6) are displayed on the display data signal line 640 (3) from the drive circuit 621 (2) via the display data signal line 640 (B). The data signal and the scanning signal output from the scanning line driver 630 to the scanning signal line 150 (1) and the scanning signal line 150 (2) are controlled. The display element 160 (7) and the display element 160 (8) are a display data signal output from the driver circuit 621 (2) to the display data signal line 640 (4) via the display data signal line 640 (B). The scanning signal is controlled by the scanning signal line 150 (3) and the scanning signal output from the scanning line driver 630 to the scanning signal line 150 (4).

Similarly, the display element 160 (9) and the display element 160 (10) are output from the drive circuit 621 (3) to the display data signal line 640 (5) via the display data signal line 640 (C). The display data signal and the scanning signal output from the scanning line driver 630 to the scanning signal line 150 (1) and the scanning signal line 150 (2) are controlled. The display element 160 (11) and the display element 160 (12) are a display data signal output from the driving circuit 621 (3) to the display data signal line 640 (6) via the display data signal line 640 (C). The scanning signal line 150 (3) output from the scanning line driver 630 and the scanning signal output to the scanning signal line 150 (4) are respectively controlled.

Each of the switches 680 (1) to 680 (6) is provided for each of the display data signal lines 640 (1) to 640 (6), and a part of the plurality of display elements 160 is displayed in plural. This is for electrically disconnecting from the other part of the element 160.

The switches 680 (1), 680 (3), and 680 (5) are controlled to be turned on or off by a switch control signal 690 (1) output from the scanning line driving device 630. The switches 680 (2), 680 (4), and 680 (6) are controlled to be turned on or off by a switch control signal 690 (2) output from the scanning line driving device 630.

Next, the operation of the display device 600 configured as described above will be described.

FIG. 10 is a timing chart for explaining the operation of the display device according to the third embodiment. Elements similar to those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIGS. 10A to 10D, the scanning line driving device 630 sequentially applies scanning signals indicating enable states to the scanning signal lines 150 (1) to 150 (4). Output.

Specifically, as shown in FIG. 10A, for example, during the period from time t1 to time t2, the scanning signal in the enabled state is output to the scanning signal line 150 (1) by the scanning line driving device 630. Next, as shown in FIG. 10B, for example, between time t2 and time t3, the scanning line driving device 630 outputs the scanning signal in the enabled state to the scanning signal line 150 (2).

Here, during the time t1 to the time t3, the display panel driving device 620 uses the driving circuit 621 (1) to the driving circuit 621 (3) to display the display data signal line 640 (A) to the display data signal line 640 (C). The display data signal is output.

Further, as shown in FIG. 10E, until the scanning signal in the enabled state is output to the scanning signal line 150 (3) (from time t1 to time t3, from time t5 to time t7), the scanning line driving device. The switch control signal 690 (1) output by 630 is enabled, and the switch control signal 690 (2) is disabled. That is, the switch 680 (1), the switch 680 (3), and the switch 680 (5) are in an enabled state until a scanning signal in an enabled state is output to the scanning signal line 150 (3), and the switch 680 (2 ), Switch 680 (4), and switch 680 (6) are disabled.

Therefore, the display data signal line 640 (A) to the display data signal line 640 (C) are connected to the display element 160 (3) and the display element 160 from time t1 to time t3 (and from time t5 to time t7). (4) The display element 160 (7), the display element 160 (8), the display element 160 (11), and the display element 160 (12) are not connected. On the other hand, the display element 160 (1), the display element 160 (2), the display element 160 (5), the display element 160 (6), the display element 160 (9), and the display element 160 (10) Display data signal) is supplied.

Next, as shown in FIG. 10C, for example, between time t3 and time t4, the scanning line driving device 630 outputs the scanning signal in the enabled state to the scanning signal line 150 (3). Next, as shown in FIG. 10D, for example, between time t4 and time t5, the scanning line driving device 630 outputs the scanning signal in the enabled state to the scanning signal line 150 (4).

Here, during the time t3 to the time t5, the display panel driving device 620 uses the driving circuit 621 (1) to the driving circuit 621 (3) to display the display data signal line 640 (A) to the display data signal line 640 (C). The display data signal is output.

Further, as shown in FIG. 10 (f), until the scanning signal in the enabled state is output to the scanning signal line 150 (1) (from time t3 to time t5, from time t7 to time t9), the scanning line driving device. The switch control signal 690 (1) output by 630 is disabled, and the switch control signal 690 (2) is enabled. In other words, the switch 680 (1), the switch 680 (3), and the switch 680 (5) are disabled until the enable scanning signal is output to the scanning signal line 150 (1), and the switch 680 is disabled. (2), switch 680 (4), and switch 680 (6) are enabled.

Therefore, the display data signal line 640 (A) to the display data signal line 640 (C) are connected to the display element 160 (1) and the display element 160 from time t3 to time t5 (and from time t7 to time t9). (2) The display element 160 (5), the display element 160 (6), the display element 160 (9), and the display element 160 (10) are not connected. On the other hand, the display element 160 (3), the display element 160 (4), the display element 160 (7), the display element 160 (8), the display element 160 (11), and the display element 160 (12) (Display data signal) is supplied.

By repeating such an operation every frame, for example, a picture can be displayed on the display panel 670.

In this way, the wiring capacitance added to the display data signal line 640 (A) to the display data signal line 640 (C), that is, the display data signal line 640 (1) to the display data signal line 640 (6) is time-sequentially. Can be reduced.

Furthermore, according to the display device 600 of the present embodiment, the signal lines for supplying the switch control signal 690 can be gathered in one place, which is advantageous for reducing the area. For example, it is useful when it is not desired to wire signal lines for supplying the switch control signal 690 adjacent to (in parallel with) the scanning signal lines 150 (1) to 150 (4). Further, for example, it is useful when there is no room in the horizontal wiring space where the scanning signal lines 150 are wired, but there is room in the vertical direction where the display data signal lines 640 are wired.

In the third embodiment, the description has been made on the assumption that the switches 680 (1) to 680 (6) are formed on the display panel. However, the present invention is not limited to this. There is no particular problem even if the switches 680 (1) to 680 (6) are formed other than the display panel 670. That is, the switches 680 (1) to 680 (6) may be configured as external components. In that case, the current capability, shape, and location of the switches 680 (1) to 680 (6) can be flexibly dealt with, so there is a cost merit such as a reduction in area.

Of course, as described above, the switches 680 (1) to 680 (6) may be formed on the display panel 670 with the same configuration as in the first and second embodiments.

Furthermore, in the third embodiment, the description has been given of branching the display data signal line 640 (A) to the display data signal line 640 (C) into two, but the present invention is not limited to this. It may be branched into three or more, and the same effect can be obtained.

(Embodiment 4)
FIG. 11 is a diagram illustrating a configuration of the display device according to the fourth embodiment. A display device 700 illustrated in FIG. 11 includes a drive device control circuit 110, a display panel drive device 720, a scanning line drive device 230, and a display panel 770. Elements similar to those in FIGS. 1, 3, and 9 are denoted by the same reference numerals, and detailed description thereof is omitted.

11 is different from the display device 100 according to the first embodiment and the display device 600 according to the third embodiment in the configuration of the display panel driving device 720 and the display panel 770. Specifically, the display panel 770 does not include the above-described switch, and the configuration is different in that the display panel driving device 720 includes the switches 780 (1) to 780 (6). The scanning line driving device 230 is the same as that shown in FIG.

The display panel drive device 720 includes drive circuits 621 (1) to 621 (3) and switches 780 (1) to 780 (6). Further, the display panel driving device 720 outputs a switch control signal 790 for controlling the switches 780 (1) to 780 (6) to be on or off.

The driving circuits 621 (1) to 621 (3) are connected to the corresponding display data signal lines 640 (A) to 640 (C), respectively. The driver circuits 621 (1) to 621 (3) output display data signals to the corresponding display data signal lines 640 (1) to 640 (6), respectively.

Here, the display data signal line 640 (A) is branched into the display data signal line 640 (1) and the display data signal line 640 (2) on the display panel driving device 720 as shown in FIG. Yes. Similarly, the display data signal line 640 (B) is branched into a display data signal line 640 (3) and a display data signal line 640 (4). The display data signal line 640 (C) is branched into a display data signal line 640 (5) and a display data signal line 640 (6).

Switch 780 (1) to switch 780 (6) are for electrically disconnecting display data signal line 640 (1) to display data signal line 640 (6), respectively, as in FIG. The switches 780 (1), 780 (3), and 780 (5) are controlled to be turned on or off by a switch control signal 790 (1) output from the display panel driving device 720. Further, the switch 780 (2), the switch 780 (4), and the switch 780 (6) are controlled to be turned on or off by a switch control signal 790 (2) output from the display panel driving device 720.

As described above, the display device 700 is configured.

According to this configuration, compared to the case where the switch 780 is formed on the display panel 770 such as an amorphous silicon TFT, the current capacity of the transistor is increased by 1000 times or more when the switch 780 is formed on the display panel driving device 720. Can do. In addition, the configuration in which the switch 780 is formed in the display panel driving device 720 can reduce the area because the space for arranging the external component can be omitted even when the switch 780 is configured by the external component. There are cost advantages.

In the fourth embodiment, it has been described that the switch control signal 790 (1) and the switch control signal 790 (2) are formed and output in the display panel driving device 720. However, the present invention is not limited to this. As in other embodiments, the control may be performed by outputting from a driving device control circuit or a scanning line driving device.

FIG. 12 is a timing chart showing the operation of the display device in the fourth embodiment. The operation of the display device 700 shown in FIG. 12 is the same as the operation of the display device 600 shown in FIG. This is because the switch control signal 790 (1) and the switch control signal 790 (2) are output from the display panel driving device 720 in the operation of the display device 700 shown in FIG. For it. In the operation of the display device 600 illustrated in FIG. 10, the switch control signal 690 (1) and the switch control signal 690 (2) are output from the scanning line driving device 630. However, FIG. 12 and FIG. 10 differ only in this point, and the operation is the same.

(Modification 1)
FIG. 13 is a diagram illustrating a configuration of a display device according to the first modification of the fourth embodiment. A display device 800 illustrated in FIG. 13 includes a drive device control circuit 110, a display panel drive device 820, a scanning line drive device 230, and a display panel 770. 1, 3, 9, and 11 are denoted by the same reference numerals, and detailed description thereof is omitted.

13 is different from the display device 700 according to Embodiment 4 in the configuration of the display panel driving device 820.

Specifically, the display panel drive device 820 controls the drive circuit for adjusting the current capability of the drive circuits 621 (1) to 621 (3) with respect to the display panel drive device 720 of the fourth embodiment. The difference is that a signal line 850 is provided.

According to the display device 800 configured as described above, by supplying a drive circuit control signal via the drive circuit control signal line 850, the current capability of the drive circuits 621 (1) to 621 (3) is increased. It can be adjusted appropriately. As a result, it is possible to further reduce power consumption and to realize low heat generation. In addition, lower EMI can be realized than lower power consumption.

Specifically, when the load capacity when the drive circuits 621 (1) to 621 (3) are driven differs in the cases 1) and 2) below, the drive capacity is adjusted in accordance with the drive load capacity. A drive circuit control signal is supplied via a circuit control signal line 850. Thereby, the current capability of the drive circuits 621 (1) to 621 (3) is appropriately adjusted.

1) When the switch control signal 790 (1) and the switch control signal 790 (2) output by the display panel driving device 820 are in the enable state and the disable state, respectively, that is, the switch 780 (1) and the switch 780 ( 3) The switch 780 (5) is set to the enabled state (conducting state, on state), and the switch 780 (2), the switch 780 (4), and the switch 780 (6) are set to the disabled state. If.

2) When the switch control signal 790 (1) and the switch control signal 790 (2) output by the display panel driving device 820 are respectively in a disabled state and an enabled state; that is, the switch 780 (1) and the switch 780 ( 3) The switch 780 (5) is set to a disabled state (non-conductive state, off state), and the switch 780 (2), the switch 780 (4), and the switch 780 (6) are enabled (conductive state, Set to ON).

As described above, when the load capacitances driven by the drive circuits 621 (1) to 621 (3) are different, by supplying the drive circuit control signal via the drive circuit control signal line 850, the drive load capacitance is increased. In addition, the current capability of the drive circuits 621 (1) to 621 (3) is adjusted appropriately. Thereby, low power consumption can be achieved, and low heat generation can be realized. In addition, lower EMI can be realized than lower power consumption.

In the present embodiment, the drive circuit control signal line 850 connected (wired) to the drive circuits 621 (1) to 621 (3) has been described as one, but the present invention is not limited to this. For example, the switch 780 is provided between the display element 160 (1), the display element 160 (5), the display element 160 (9), the display element 160 (2), the display element 160 (6), and the display element 160 (10). It is good. In this case, the load capacity pattern driven by the drive circuits 621 (1) to 621 (3) increases. Therefore, the current capability of the drive circuits 621 (1) to 621 (3) may be adjusted by increasing the number of drive circuit control signal lines 850 accordingly. In addition, a switch is provided between the display element 160 (3), the display element 160 (7), the display element 160 (11), the display element 160 (4), the display element 160 (8), and the display element 160 (12). Also good. In this case, the same applies to the case where the number of branches from the display data signal lines 640 (A) to 640 (C) is increased. In other words, in the above case, the pattern of the load capacitance driven by the drive circuits 621 (1) to 621 (3) increases, so that the number of drive circuit control signal lines 850 is increased accordingly, and the drive circuit The current capability of 621 (1) to drive circuit 621 (3) may be adjusted.

As described above, according to the present invention, it is possible to realize a display device capable of suppressing an increase in power consumption and heat generation regardless of a display panel driving method.

The display device of the present invention has been described above based on the embodiment, but the present invention is not limited to this embodiment. Unless it deviates from the meaning of this invention, the form which carried out the various deformation | transformation which those skilled in the art can think to this embodiment, and the structure constructed | assembled combining the component in different embodiment is also contained in the scope of the present invention. .

For example, the display device according to the present invention has been described mainly with a liquid crystal display, but is not limited thereto. An organic EL display or a PDP display may be used, and similar effects can be achieved.

The switch according to the present invention has been described as being formed by, for example, an amorphous silicon TFT, LTPS-TFT, or HTPS-TFT (High Temperature Polycrystalline Silicon TFT), but is not limited thereto. As long as the display data signal lines can be electrically disconnected from each other, for example, a μSi-TFT or a TFT formed of another material may be used. When the display data signal lines are not formed on the display panel, they may not be TFTs, and may be semiconductor switches or mechanical S / Ws as long as the display data signal lines can be electrically disconnected.

The present invention can be used for a display device, and in particular, for a display device such as a liquid crystal display, an organic EL display, or a PDP display that has various driving methods and needs to realize low heat generation.

100, 200, 300, 400, 500, 600, 700, 800, 900

Display device

110, 310, 910 Drive

device control circuit

111, 911

First control signal

112, 912

Second control signal

120, 220, 620, 720, 820, 920

Display panel driver

130, 230, 430, 630, 930

Scan line driver

140, 640 Display data signal line 150

Scan signal line

160, 960

Display element

170, 270, 370, 470, 570, 670, 770, 970

Display panel

180, 480, 680, 780, 980

Switch

190, 290, 390, 490, 690, 790

Switch control signal

621, 921 Drive circuit 850 Drive circuit control signal line 940 Display data signal 950 Scan signal

Claims

A display panel having a plurality of display elements arranged in a matrix;
A plurality of scanning lines provided corresponding to a plurality of rows of the plurality of display elements and for supplying a scanning signal for controlling the plurality of display elements in the corresponding row;
A plurality of data signal lines provided corresponding to a plurality of columns of the plurality of display elements, and for supplying data signals for determining the brightness of each of the plurality of display elements in the corresponding column;
And a switch provided on at least one data signal line among the plurality of data signal lines and electrically disconnecting a part of the plurality of display elements from the other part of the plurality of display elements.
The display device according to claim 1, wherein the switch is formed in the display panel.
The display device further includes a data line driving device that generates the data signal to be supplied to the plurality of data signal lines,
The display device according to claim 1, wherein the switch is formed in the data line driving device.
The display device according to any one of claims 1 to 3, wherein at least one switch is provided for each of the plurality of data signal lines.
The display device according to claim 2, wherein one switch is provided for each of the plurality of data signal lines, and is provided at a position that bisects the plurality of display elements in a corresponding column.
The display device according to claim 2, wherein a plurality of the switches are provided in each of the plurality of data signal lines, and are provided at all positions corresponding to adjacent display elements in a corresponding column.
The switch is provided in each of the plurality of data signal lines, and is provided at a position corresponding to between a plurality of display elements in a corresponding column,
The display device according to claim 2, wherein the number of the switches provided in each of the plurality of data signal lines is different between adjacent data signal lines.
The display device further includes a data line driving device that generates the data signal to be supplied to the plurality of data signal lines,
Each of the plurality of data signal lines includes a first branch data signal line and a second branch data signal line, and the plurality of data signal lines include the first branch data signal line and the second branch data signal line. Branch to
Each of the first branch data signal lines is provided corresponding to a part of a plurality of rows of the plurality of display elements, and each of the second branch data signal lines is a plurality of the plurality of display elements. Corresponding to the rest of the line,
The display device according to claim 2, wherein one switch is provided for each of the first branch data signal lines and each of the second branch data signal lines.
The plurality of data signal lines are branched into the first branch data signal line and the second branch data signal line in the data line driving device,
The switch is provided in the data line driving device and corresponds to a part of a plurality of rows of the plurality of display elements corresponding to the first branch data signal line or the second branch data signal line. The display device according to claim 8, wherein the remaining portions of the plurality of rows of the plurality of display elements are electrically separated.
The data line driving device includes a plurality of driving circuits for supplying the data signals to corresponding data signal lines,
A control line for supplying a control signal for controlling the drive circuit is connected to the plurality of drive circuits,
The display device according to claim 9, wherein a current capability of the plurality of drive circuits is adjusted by the control signal.
The display device further includes a scanning line driving device that generates the scanning signal to be supplied to the plurality of scanning signal lines and generates a switch control signal for controlling the switch,
The display device according to any one of claims 1 to 4, wherein the switch is controlled to be turned on or off by the switch control signal.
The display device further includes a data line driving device that generates the data signal to be supplied to the plurality of data signal lines and generates a switch control signal for controlling the switch,
The display device according to any one of claims 1 to 4, wherein the switch is controlled to be turned on or off by the switch control signal.
The display device further includes:
A scanning line driving device for generating the scanning signal to be supplied to the plurality of scanning signal lines;
A data line driving device for generating the data signal to be supplied to the plurality of data signal lines;
A drive device control circuit for generating a switch control signal for controlling the switch,
The display device according to any one of claims 1 to 4, wherein the switch is controlled to be turned on or off by the switch control signal.
An integrated circuit constituting a display panel having a plurality of display elements arranged in a matrix,
A plurality of scanning lines provided corresponding to a plurality of rows of the plurality of display elements and for supplying a scanning signal for controlling the plurality of display elements in the corresponding row;
A plurality of data signal lines provided corresponding to a plurality of columns of the plurality of display elements, and for supplying data signals for determining the brightness of each of the plurality of display elements in the corresponding column;
An integrated circuit comprising: a switch provided on at least one of the plurality of data signal lines, and electrically disconnecting a part of the plurality of display elements from the other part of the plurality of display elements.