JP2007240574A - Display device and driving method of display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of improving image quality and reducing power consumption in spite of a large screen by providing a new technique which allows all pixels to be simultaneously driven at the same timing. <P>SOLUTION: Each of a plurality of pixel driving elements 11 in the display device includes: a decoder 21 which separates a color signal, a luminance signal, a pixel address signal, and a pixel driving timing signal from a display pixel driving signal having these signals superposed one over another; a comparison circuit 26 which compares and collates the separated pixel signal with address information of a pertinent pixel driving element 11; and a storage circuit 27 wherein the separated luminance signal is temporarily stored. When comparison and collation result of the comparison circuit 26 indicates that the pixel address signal is identical to the address information of the pixel driving element 11, the pixel driving element 11 drives pixels in accordance with the timing of the luminance signal read from the storage circuit 27 on the basis of the pixel driving timing signal separated by the decoder 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device that drives a plurality of pixels to display an image and a driving method of the display device.

  2. Description of the Related Art In recent years, display devices such as LCD (Liquid Crystal Display) used for personal computers and televisions have been actively developed for the purpose of high image quality, low power consumption, high speed, and the like.

  As such a display device, a micro color filter system is generally employed. However, this micro color filter system has problems such as a reduction in quality due to light absorption by the color filter. Thus, in recent years, a so-called field sequential method has been proposed as a display method for displaying a color image without using a color filter (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-316092

  In this field sequential method, image data for each of the three unit colors of red, green, and blue is sequentially written to pixels in each pixel row of a display element having a display area in which a plurality of pixels are arranged in a matrix. By sequentially emitting light of the color corresponding to the image data of each color from the surface light source, the unit color images of three colors of red, green and blue are sequentially displayed on each pixel, and full color is achieved by visual mixing of each color. This is a method for displaying an image. Such a field sequential method is attracting attention as it can improve brightness and resolution because it does not require the use of a color filter.

  By the way, in the conventional display device, for example, as shown in FIG. 9, a display in which pixel drive elements 101 for driving each pixel are arranged in a matrix on a predetermined array substrate is divided into predetermined blocks, and each block is displayed. In some cases, the pixels were driven all at once. However, in the conventional display device, all the pixels constituting the display cannot be driven simultaneously at the same timing. Therefore, in a conventional display device, the larger the screen, the larger the number of blocks that are not driven at the same timing, leading to a situation where the image connection between frames deteriorates, and a sharp image is displayed. There was a problem that could not. Such a problem is particularly noticeable as a color blur of an outline when displaying a moving image in a display device driven by a field sequential method, which has been a factor that makes it impossible to increase the screen size of the field sequential display device.

  The present invention has been made in view of such a situation, and proposes a new method capable of simultaneously driving all pixels at the same timing, and achieves high image quality and low power consumption even on a large screen. It is an object of the present invention to provide a display device and a display device driving method capable of achieving the above.

  A display device according to the present invention that achieves the above-described object is a display device that displays an image by driving a plurality of pixels, a plurality of pixel driving elements that drive each pixel, and a predetermined voltage or A power supply circuit that drives by supplying current, and the pixel driving element separates each signal from a display pixel driving signal on which a color signal, a luminance signal, a pixel address signal, and a pixel driving timing signal are superimposed. Means for comparing and comparing the pixel address signal separated by the separating means and the address information of the pixel driving element, and storage means for temporarily storing the luminance signal separated by the separating means, When the comparison / collation result by the comparison / collation means indicates that the pixel address signal and the address information of the pixel driving element are the same, the separation Based on the pixel driving timing signal separated by a step, it is characterized by having a pixel drive means for driving the pixels to match the timing of the luminance signal read from the storage means.

  In such a display device according to the present invention, all the pixels constituting the display can be simultaneously driven at the same timing. Therefore, in the display device according to the present invention, even when the field sequential method is adopted as the display method, the color blur of the contour when displaying a moving image is difficult to appear, which is not possible conventionally. Screening can be achieved.

  In the display device according to the present invention, all the pixels are simultaneously driven based on the luminance signal of each unit color by the pixel driving means in the plurality of pixel driving elements, and the backlight is predetermined at the timing when the driving is completed. Control means for controlling to light only for a period is provided. In such a display device according to the present invention, since the drive time of the entire screen is exactly the same in a predetermined period within one frame, the existing high image quality in which the backlight is turned off and the entire screen is displayed in black. The display method can be used more effectively and the power consumption can be reduced.

  Furthermore, in the display device according to the present invention, the pixel driving element has initialization function means for determining and storing the address of the pixel driving element itself, and the comparison / collation means is separated by the separation means. The pixel address signal is compared with the address information stored in the initialization function means.

  Thereby, in the display device according to the present invention, it is possible to determine the address of the pixel driving element after the pixel driving element is mounted on the display. For this reason, the display device according to the present invention can be configured using chips of exactly the same pixel driving element, and even if it is detected that a defective product is mounted, it is sufficient to simply replace it. Thus, it becomes possible to facilitate manufacturing and reduce the cost of parts.

  Furthermore, in the display device according to the present invention, the power supply circuit that outputs positive or negative voltage or current can be used. The plurality of pixel driving elements are arranged in a matrix on a predetermined substrate, and two pixels of positive and negative polarity are respectively provided in the horizontal direction terminals of the pixel driving elements arranged in a matrix. And a signal line for supplying a display pixel driving signal is connected to each vertical terminal of the pixel driving element. Specifically, the two power supply lines are wired so that the power supply lines having the same polarity are connected to the pixel driving elements located on both sides, and the signal lines are input from the primary side. The display pixel drive signal is wired so as to be transmitted to the pixel drive element at the next stage on the secondary side. At this time, the initialization function means controls the switching element connected to the signal line to electrically connect the signal line so that a signal is not transmitted to the pixel driving element of the next stage on the secondary side. In this state, the address information represented by the pixel address signal input from the primary side is determined and stored as the address of the pixel driving element itself, and the switching element is controlled to be shut off. The signal line is electrically opened, and a pixel address signal including address information obtained by adding 1 to the stored address information is transmitted to the next pixel drive element via the signal line.

  Thereby, in the display device according to the present invention, only four lines, that is, the power supply line and the signal line, need to be connected to one pixel driving element. The wiring pattern is the same as the conventional one, or it can be configured with an easy wiring pattern having a smaller number of wirings than the conventional one.

  The display device driving method according to the present invention that achieves the above-described object is a display device driving method in which a plurality of pixels are driven to display an image, and a predetermined voltage or current is supplied from a power supply circuit. A separation step of separating each of these signals from a display pixel drive signal in which a color signal, a luminance signal, a pixel address signal, and a pixel drive timing signal are superimposed by a plurality of pixel drive elements that drive the pixel, and a separated pixel address signal A comparison and collation step for comparing and collating the address information of the pixel driving element, a storage step for temporarily storing the luminance signal separated in the separation step in a predetermined storage means, and a comparison and collation in the comparison and collation step When the result indicates that the pixel address signal and the address information of the pixel driving element are the same, the pixel driving separated in the separation step Based on the timing signal, and characterized by comprising a pixel driving step of driving the pixel timed luminance signal read from the storage means.

  In such a method for driving a display device according to the present invention, it is possible to simultaneously drive all the pixels constituting the display at the same timing. Therefore, in the driving method of the display device according to the present invention, even when the field sequential method is adopted as the display method, the color blur of the contour when displaying a moving image hardly appears, so that it is impossible in the past. It is possible to increase the screen size.

  According to the present invention, since all the pixels can be driven simultaneously at the same timing, it is possible to achieve high image quality and low power consumption even on a large screen.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  This embodiment is a display device that displays an image by driving a plurality of pixels. In particular, this display device can drive all pixels simultaneously at the same timing. Hereinafter, for convenience of explanation, a display device composed of 1920 pixels in the horizontal direction × 1080 pixels in the vertical direction that displays a color image in a field sequential manner will be described.

  As shown in FIG. 1, the display device is configured by arranging a plurality of chip-like pixel driving elements 11 for driving each pixel on a predetermined array substrate in a matrix. Here, the pixel refers to the minimum structural unit of an image displayed by the display device. Here, as shown in FIG. 2, the display device is configured to drive four pixels P0, P1, P2, and P3 each consisting of two pixels in the horizontal direction and two pixels in the vertical direction per pixel driving element 11. The That is, this display device is configured by providing 960 × 540 pixel driving elements 11 for 1920 pixels in the horizontal direction × 1080 pixels in the vertical direction. In the following, as shown in the figure, the display signal written to each pixel is assumed to be scanned in the horizontal direction from the left end side of the display, and the horizontal address x is set to 0, 1 from the left side (primary side). ,..., I,..., 958, 959, and vertical address y from the upper side (primary side) is 0, 1,. The address of the element 11 is represented by N (0, 0) to N (959, 539).

As shown in FIG. 3, two positive and negative power supply lines 12a and 12b are connected to the horizontal direction terminals of the pixel drive elements 11 arranged in a matrix. More specifically, in the display device, the power supply lines 12a and 12b are wired so that the power supply lines having the same polarity are connected to the pixel driving elements 11 located on both sides. Therefore, in the display device, when the positive power supply line 12a is connected to the left horizontal terminal of the pixel driving element 11 whose address x is an even number, the right horizontal terminal of the pixel driving element 11 The negative power supply line 12b is connected to the left horizontal terminal of the pixel driving element 11 whose address x is an odd number. In the display device, by providing the positive and negative power supply lines 12a and 12b as described above, the number of wirings can be reduced, and accordingly, the transmittance can be increased. On the other hand, a signal line 13 _x corresponding to each address _x is connected to the vertical direction terminal of the pixel driving element 11. More specifically, in the display device, the display input from the host device by _n column driving drivers 14 ₀ ,..., 14 _k ,. The Y column display pixel drive signal including the address signal of each pixel obtained by converting the signal is supplied to the vertical direction terminal of the pixel drive element 11 through the signal line 13 _x .

Such a pixel driving element 11 is specifically configured as shown in FIG. That is, the pixel driving element 11 includes a decoder 21 that separates a signal included in the Y column display pixel driving signal converted by the corresponding column driving driver 14, and an initialization command circuit 22 that controls a command at initialization described later. A self-address memory circuit 23 that stores its own address based on the command of the initialization command circuit 22; and address information (self-address) obtained by adding “1” to the address information stored in the self-address memory circuit 23. Pixel address supplied from the self-address + 1 transmission circuit 24 for transmitting the pixel address signal including information + 1) to the next stage, the switching element 25 provided in the transmission signal line 13 _x to the next stage, and the decoder 21 A comparison circuit 26 for comparing and comparing the signal and address information stored in the self-address storage circuit 23, and a decoder 21 A storage circuit 27 that temporarily stores the separated luminance signal, and four switching elements 28 ₀ , 28 ₁ , 28 ₂ , 28 that are driven based on the pixel drive timing signal (frame synchronization signal) separated by the decoder 21. ₃ and four luminance / current conversion circuits 29 ₀ , 29 ₁ , 29 ₂ , 29 ₃ for converting luminance signals supplied via the switching elements 28 ₀ , 28 ₁ , 28 ₂ , 28 ₃ into currents, respectively. When these luminance-current converting circuit _{29 0,} 29 _1, 29 2, 29 ₃ of each pixel based on the supplied current from each P0, P1, P2, 4 to drive the P3 single pixel driver ₃₀ 0, 30 ₁ , 30 ₂ , 30 ₃ . These units are driven by a predetermined voltage or current obtained by rectification and conversion by a rectifier circuit 32 corresponding to both positive and negative polarities provided in the power supply circuit 31.

The decoder 21 separates these signals from the Y column display pixel driving signal on which the color signal, luminance signal, pixel address signal, and pixel driving timing signal supplied from the column driving driver 14 are superimposed. Pixel address signal separated by the decoder 21 is supplied to a comparator circuit 26, the luminance signal is supplied to the memory circuit 27, the pixel driving timing signal, the switching element _{28 0,} 28 _1, 28 2, 28 ₃ Supplied. Further, at the time of initialization, the decoder 21 receives at least the initialization signal and the pixel address signal supplied from the host device, and supplies the initialization signal and the pixel address signal to the initialization command circuit 22.

The initialization command circuit 22 is configured as an initialization function circuit that determines and stores the address of the pixel driving element 11 itself together with the self-address storage circuit 23, and issues a command necessary for initialization. The initialization here is usually performed in the manufacturing process of the display device. Specifically, as shown in FIG. 5, when the initialization command circuit 22 receives the initialization signal from the decoder 21 at the time of initialization, the initialization command circuit 22 supplies the initialization command signal to the switching element 25, so that the secondary side The transmission signal line 13 _x to the next stage is electrically cut off so that the signal is not transmitted to the next stage. Subsequently, when a pixel address signal is input from the primary side, the initialization command circuit 22 determines address information represented by the pixel address signal as the address of the pixel drive element 11 itself, and stores it in the self address storage circuit 23. Remember. Then, the initialization command circuit 22, when storing the address information in the own address storage circuit 23, by supplying an initialization command signal to the switching element 25, a transmission signal line 13 _x to the next stage which has been cut off Is opened electrically.

  The self-address storage circuit 23 is configured as an initialization function circuit together with the initialization command circuit 22 and stores the address information supplied from the initialization command circuit 22 at the time of initialization as the address of the pixel driving element 11 itself. The address information stored in the self address storage circuit 23 is read out by the comparison circuit 26 when an image is displayed.

The self-address + 1 transmission circuit 24 is stored in the self-address storage circuit 23 as the switching element 25 is driven by the initialization command circuit 22 and the transmission signal line 13 _x to the next stage is electrically opened. A pixel address signal including address information (self address information + 1) obtained by adding “1” to the address information is transmitted to the next stage via the transmission signal line 13 _x .

The switching element 25 is made of, for example, transistors or the like, controls the conduction of the signal line 13 _x by electrically disconnected or open extending the signal lines 13 _x to send a display pixel drive signals to the next stage To be provided. That is, the pixel driving element 11 transmits the display pixel driving signal input from the primary side to the pixel driving element 11 at the next stage via the signal line 13 _x to which the switching element 25 is connected. Line 13 _x is wired. Specifically, at the time of initialization, the switching element 25 electrically shuts off or opens the signal line 13 _x based on the initialization command signal supplied from the initialization command circuit 22, and the pixel address to the next stage. Control signal transmission.

  The comparison circuit 26 compares the pixel address signal supplied from the decoder 21 with the address information stored in the self address storage circuit 23. The comparison circuit 26 supplies a comparison / collation result signal indicating the comparison / collation result to the storage circuit 27.

The storage circuit 27 temporarily stores the luminance signal separated by the decoder 21. In the pixel drive element 11, when the luminance signals of all the pixels in a certain display frame are stored in the storage circuit 27, the luminance signal stored in the storage circuit 27 is based on the comparison verification result signal supplied from the comparison circuit 26. and it supplies the switching elements _{28 0,} 28 _1, 28 2, 28 ₃ 0 luminance-current converting circuit ₂₉ via _a 29 _1, 29 2, 29 _3. Specifically, the pixel drive element 11 has a case where the comparison verification result signal supplied from the comparison circuit 26 indicates that the pixel address signal and the address information stored in the self address storage circuit 23 are the same. Since the luminance signal stored in the memory circuit 27 is to be written to the pixels P0, P1, P2, and P3 driven by the pixel driving element 11, the luminance signal is switched to the switching elements 28 ₀ , 28 ₁ , The luminance / current conversion circuits 29 ₀ , 29 ₁ , 29 ₂ , and 29 ₃ are supplied via 28 ₂ and 28 ₃ .

The switching elements 28 ₀ , 28 ₁ , 28 ₂ , and 28 ₃ are respectively memory circuits together with luminance / current conversion circuits 29 ₀ , 29 ₁ , 29 ₂ , and 29 ₃ and pixel drivers 30 ₀ , 30 ₁ , 30 ₂ , and 30 _3. 27 is configured as a pixel driving circuit for driving the pixels in accordance with the timing of the luminance signal read from the pixel 27. Each of the switching elements 28 ₀ , 28 ₁ , 28 ₂ , and 28 ₃ is formed of, for example, a transistor, and the luminance signal corresponding to each of the four pixels P0, P1, P2, and P3 read from the storage circuit 25 is displayed. A current conversion circuit 29 ₀ , 29 ₁ , 29 ₂ , 29 ₃ is provided so as to control conduction of the signal line by electrically interrupting or opening the signal line extending to supply each of the current conversion circuit 29 ₀ , 29 ₁ , 29 ₂ , 29 ₃ Specifically, each of the switching elements 28 ₀ , 28 ₁ , 28 ₂ , and 28 ₃ is read from the storage circuit 27 based on the pixel drive timing signal separated by the decoder 21 when displaying an image. Control is performed so that the timings of the luminance signals corresponding to the respective pixels P0, P1, P2, and P3 are supplied to the luminance / current conversion circuits 29 ₀ , 29 ₁ , 29 ₂ , and 29 ₃ in synchronization.

Luminance-current converting circuit _{29 0,} 29 _1, 29 2, 29 _3, respectively, the switching elements _{28 0,} 28 _1, 28 2, 28 ₃ and the pixel driver _{30 0,} 30 _1, 30 2, 30 ₃ with the pixel drive is configured as a circuit, the luminance signal read from the memory circuit 27 via the switching element _{28 0,} 28 _1, 28 2, 28 _3, into a current corresponding to the level. The luminance / current conversion circuits 29 ₀ , 29 ₁ , 29 ₂ , and 29 ₃ supply the converted currents to the pixel drivers 30 ₀ , 30 ₁ , 30 ₂ , and 30 ₃ , respectively.

The pixel drivers 30 ₀ , 30 ₁ , 30 ₂ , and 30 ₃ are respectively driven with the switching elements 28 ₀ , 28 ₁ , 28 ₂ , and 28 ₃ and the luminance / current conversion circuits 29 ₀ , 29 ₁ , 29 ₂ , and 29 _3. Each pixel P 0, configured as a circuit, based on the positive or negative power source supplied from the power source circuit 31 and the current supplied from the luminance / current conversion circuits 29 ₀ , 29 ₁ , 29 ₂ , 29 ₃ P1, P2, and P3 are driven simultaneously.

  A display device including the pixel driving element 11 having each part as described above operates as follows.

First, the operation of the display device during initialization will be described with reference to FIG. In the figure, for convenience of description, 0 is the horizontal address x, i.e., connected to address signal lines 13 ₀ N (0,0), N (0,1 ), ···, N Although the operation of the pixel drive elements 11 of (0, j),..., N (0, 539) is shown, all the pixel drive elements 11 operate in the same manner in the display device.

First, in the display apparatus converts the Y ₀ row display pixel drive signal a display signal supplied from the host device by the column driver for driving 14 _0, the initialization signal each contained in the Y _0-column display pixel drive signals When input to the initialization command circuit 22 via the decoder 21 in the pixel drive element 11, the initialization operation is started. Then, in the display device, by the initialization command circuit 22 of each pixel driving element 11 to supply an initialization command signal to the switching element 25, thereby blocking the signal line 13 ₀ electrically.

Subsequently, the display apparatus converts the Y ₀ row display pixel drive signal a display signal supplied from the host device by the column driver for driving 14 _0, the pixel address signal included in the Y _0-column display pixel drive signals It is supplied to the uppermost pixel drive element 11. At this time, the address information of the pixel address signal is N (0, 0). When the pixel address signal is input to the initialization command circuit 22 via the decoder 21, the uppermost pixel drive element 11 receives the address information N (0, 0) represented by the pixel address signal in the initialization command. The circuit 22 determines the address of the pixel driving element 11 itself and stores it in the self-address storage circuit 23. The uppermost pixel drive element 11 whose address is N (0, 0) supplies an initialization command signal from the initialization command circuit 22 to the switching element 25, so that the next stage that has been shut off is supplied. a signal line 13 ₀ causes electrically opened, the pixel address signal including an address obtained by adding "1" to the address information stored in the own address storage circuit 23 information N (0, 1), self-address + 1 transmission circuit by 24, it is transmitted via the signal line 13 ₀ and the next stage of the pixel driving element 11.

Similarly, when the pixel address signal is input to the initialization command circuit 22 via the decoder 21, the pixel drive element 11 at the next stage receives the address information N (0, 1) represented by the pixel address signal. The initialization command circuit 22 determines the address of the pixel drive element 11 itself and stores it in the self-address storage circuit 23. Then, the pixel drive element 11 whose address is N (0, 1) supplies an initialization command signal from the initialization command circuit 22 to the switching element 25, whereby the signal line 13 to the next stage that has been shut off is supplied. ₀ causes electrically opened, a pixel address signal including an address obtained by adding "1" to the address information stored in the own address storage circuit 23 information N (0, 2), the self-address + 1 transmission circuit 24, and it transmits to the next pixel drive element 11 via the signal line 13 _0.

In the display device, such an operation is repeated until the pixel driving element 11 at the lowest stage. When the lowermost pixel drive element 11 determines its own address as N (0, 539) and stores it in the self address storage circuit 23, the initialization command circuit 22 sends an initialization command signal to the switching element 25. by supplying the signal lines 13 ₀ to the next stage which has been blocked with is electrically opened, the self-address memory circuit in the address information stored in the 23 "1" only adds address information N (0,540 a pixel address signal including a), by the self-address + 1 transmission circuit 24, is sent to the column driver for driving 14 ₀ through the signal line 13 _0. Thus, in the display device, as appropriate address to all the pixel drive element 11 connected to the signal line 13 ₀ is assigned, to stop the initialization operation.

In the display device, such an operation is performed for every column for all the pixel driving elements 11 connected to all the signal lines 13 _x , so that addresses are appropriately assigned to all the pixel driving elements 11 and used. It becomes possible. As described above, in the display device, the address of the pixel driving element 11 is determined every time the initialization operation is performed, so that it is not necessary to assign an address before mounting on the display in a factory or the like. Therefore, in manufacturing the display device, it is only necessary to manufacture a chip of the same pixel driving element 11, and even if it is detected that a defective product is mounted, it is sufficient to simply replace it. And cost reduction of parts can be achieved.

Next, the operation of the display device during image display will be described with reference to FIGS. Also in this figure, for convenience of explanation, 0 a horizontal address x, i.e., connected to address signal lines 13 ₀ N (0,0), N (0,1 ), ···, N Although the operation of the pixel drive elements 11 of (0, j),..., N (0, 539) is shown, all the pixel drive elements 11 operate in the same manner in the display device.

  First, in the conventional display device, as shown in FIG. 7A, the display signal of the mth frame is given from the host device, and red (R), green (G), blue (B ) Are converted into Y-column display pixel drive signals for each unit color and then supplied to the pixel drive elements for each column, each pixel is driven based on the luminance signal for each unit color. At this time, in the conventional display device, it is necessary to continuously turn on the backlight from the start of the driving operation of each pixel based on the luminance signal of each unit color until the driving of all the pixels is completed. For this reason, the conventional display device has a problem that power consumption is increased by continuing to turn on the backlight, and image quality is deteriorated due to an image leaking to the display surface during driving of each pixel.

  On the other hand, in the display device shown as the embodiment of the present invention, as shown in FIG. 7B, the display signal of the m-th frame is given from the host device and red (R ), Green (G), and blue (B) converted into Y-column display pixel drive signals of unit colors, and supplied to the pixel drive elements 11 in each column, the red (R) luminance signal is decoded. 21 and temporarily stored in the memory circuit 27. In the display device, when the red luminance signal for all the pixels in the m-th frame is stored in the storage circuit 27, each pixel P 0, P 1, P 2, based on the pixel drive timing signal separated by the decoder 21. P3 is driven all at once to display the red component. Subsequently, in the display device, the red component is displayed, the green (G) luminance signal is separated by the decoder 21 and temporarily stored in the storage circuit 27, and the green luminance for all the pixels in the m-th frame is displayed. When the signal is stored in the storage circuit 27, the pixels P0, P1, P2, and P3 are simultaneously driven based on the pixel drive timing signals separated by the decoder 21 to display the green component. In the display device, the green component is displayed, the blue (B) luminance signal is separated by the decoder 21 and temporarily stored in the storage circuit 27, and the blue luminance signal for all pixels in the m-th frame is displayed. Is stored in the storage circuit 27, based on the pixel drive timing signal separated by the decoder 21, the pixels P0, P1, P2, and P3 are simultaneously driven to display the blue component, and the m-th frame is displayed. To complete.

More specifically, in the display device, as shown in FIG. 8, n column driving drivers 14 ₀ ,..., 14 provided with display signals given from the host device for each predetermined block. _k ,..., 14 _n are converted into Y-column display pixel drive signals for each column, and then supplied to the pixel drive elements 11 for each column, the red (R) luminance signal is output by the decoder 21. Separated and temporarily stored in the storage circuit 25. Here, the address corresponding to the signal line 13 ₀ N (0,0), N (0,1 ), ···, N (0, j), ···, pixel drive the N (0,539) The Y ₀ column display pixel drive signal supplied to the element 11 follows the header indicating that it is red (R), and the red luminance to be supplied to the pixel drive element 11 whose address is N (0, 0). Red luminance signal to be supplied to the pixel driving element 11 with the signal, address N (0,1),..., Red luminance to be supplied to the pixel driving element 11 with the address N (0, j) After the red luminance signal to be supplied to the pixel driving element 11 with the address N (0,539) is sequentially separated, the signal is supplied to the pixel driving element 11 with the address N (0,0). Green luminance signal to be processed, green luminance signal to be supplied to the pixel driving element 11 whose address is N (0,1) ..., a green luminance signal to be supplied to the pixel driving element 11 whose address is N (0, j), ..., green which is to be supplied to the pixel driving element 11 whose address is N (0,539) Are sequentially separated and further supplied to the pixel driving element 11 having the address N (0, 1) and the blue luminance signal to be supplied to the pixel driving element 11 having the address N (0, 0). The blue luminance signal to be supplied to the pixel driving element 11 whose address is N (0, j),..., The pixel driving element 11 whose address is N (0,539). The blue luminance signals to be supplied to are sequentially separated. In the display device, when the red luminance signals for all the pixels in the m-th frame are stored in the storage circuit 27, the pixels P0, P1, P2, and P3 are simultaneously driven to display the red component, Subsequently, when the green luminance signals for all the pixels in the m-th frame are stored in the storage circuit 27, the pixels P0, P1, P2, and P3 are simultaneously driven to display the green component, and further, the m-frame is displayed. When the blue luminance signals for all the pixels in the eye are stored in the storage circuit 27, the pixels P0, P1, P2, and P3 are simultaneously driven to display the blue component. In the display device, such an operation is performed for each column for all the pixel driving elements 11 connected to all the signal lines 13 _x , so that all the pixels can be driven simultaneously for each unit color. It becomes possible.

  Here, in the display device, as shown in FIG. 7B, all the pixels are driven at the same time based on the luminance signal of each unit color, and at the timing when the driving is completed, the control of the predetermined control means is performed. The backlight is turned on only for a predetermined period. Therefore, in the display device, it is not necessary to keep the backlight on as in the case of the conventional display device, so that an image in the middle of driving each pixel does not leak to the display surface, and the image quality is greatly improved. You can plan. Moreover, in the display device, the period during which the backlight is turned on is completely synchronized with the timing of completion of driving of each pixel, so that the power consumption is greatly reduced compared to the conventional display device that keeps turning on the backlight. Can be achieved.

  As described above, in the display device shown as an embodiment of the present invention, since all the pixels constituting the display are driven at the same time at the same time, the drive time of the entire screen is exactly the same for a predetermined period within one frame. It becomes. Therefore, in the display device, the existing high image quality display method of turning off the backlight and displaying the entire screen in black for a predetermined period within one frame can be used more effectively, and the power consumption can be reduced. Reduction can be achieved.

  Further, even if the field sequential method is adopted as the display method in the display device, blurring of the outline color when displaying a moving image does not easily appear, so that it is possible to achieve a large screen that was impossible in the past. .

Further, in the display device, one pixel drive element 11 to the connection to be wiring the power supply line 12a, since it requires only four 12b and the signal line 13 _x, using the pixel driving element 11 which implements the advanced functionality However, the wiring pattern is not different from the conventional one, or it can be configured with an easy wiring pattern having a smaller number of wirings than the conventional one.

  Furthermore, in the display device, the address of the pixel driving element 11 can be determined after the pixel driving element 11 is mounted on the display. For this reason, the display device can be configured by using the same chip of the pixel drive element 11, and even if it is detected that a defective product is mounted, it is sufficient to simply replace it. It becomes possible to facilitate and reduce the cost of parts.

  The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, a display device composed of 1920 pixels in the horizontal direction and 1080 pixels in the vertical direction that displays a color image by the field sequential method has been described, but the present invention employs a display method that is not the field sequential method. Even a display device can be applied, and an arbitrary screen size can be applied.

  Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

It is a figure explaining schematic structure of the display device shown as an embodiment of the invention. It is a figure for demonstrating the address of the pixel drive element mounted in the display apparatus shown as embodiment of this invention. FIG. 11 is a diagram illustrating a wiring structure of a display device shown as an embodiment of the present invention. FIG. 11 is a block diagram illustrating a circuit configuration of a display device shown as an embodiment of the present invention. FIG. 11 is a block diagram illustrating a circuit configuration of an initialization function circuit in the display device shown as the embodiment of the present invention. It is a figure for demonstrating a series of operation | movement at the time of performing initialization in the display apparatus shown as embodiment of this invention, and is a timing chart of the signal transmitted / received when performing initialization. It is a figure for demonstrating a series of operation | movement at the time of displaying an image in the display apparatus shown as embodiment of this invention, (a) is exchanged when displaying an image in the conventional display apparatus. It is a timing chart of a signal, and (b) is a timing chart of a signal sent and received when displaying an image in the display device shown as an embodiment of the present invention. It is a figure for demonstrating a series of operation | movement at the time of displaying an image in the display apparatus shown as embodiment of this invention, and is a timing chart of the red luminance signal transmitted / received when displaying an image. It is a figure explaining schematic structure of the conventional display apparatus.

Explanation of symbols

11 pixel drive element 12a, 12b power line 13 _x signal line 14 ₀ ,..., 14 _k ,..., 14 _n column drive driver 21 decoder 22 initialization command circuit 23 self address storage circuit 24 self address + 1 transmission circuit 25 switching element 26 comparison circuit 27 storage circuit 28 _{0, 28 1,} 28 2, 28 ₃ the switching elements 29 _{0, 29 1,} 29 2, 29 ₃ luminance-current converting circuit 30 _{0, 30 1,} 30 2, 30 ₃ Pixel driver 31 Power supply circuit 32 Rectifier circuit P0, P1, P2, P3 Pixel

Claims (6)

In a display device that displays an image by driving a plurality of pixels,
A plurality of pixel driving elements for driving each pixel;
A power supply circuit that drives the pixel driving element by supplying a predetermined voltage or current,
The pixel driving element is:
Separating means for separating each of these signals from a display pixel driving signal on which a color signal, a luminance signal, a pixel address signal, and a pixel driving timing signal are superimposed;
A comparison collation means for comparing and collating the pixel address signal separated by the separation means and the address information of the pixel driving element;
Storage means for temporarily storing the luminance signal separated by the separation means;
When the comparison / collation result by the comparison / collation means indicates that the pixel address signal and the address information of the pixel drive element are the same, the storage is performed based on the pixel drive timing signal separated by the separation means. And a pixel driving means for driving the pixels in synchronism with the timing of the luminance signal read from the means.   Control means for controlling all the pixels at the same time based on the luminance signal of each unit color by the pixel driving means in the plurality of pixel driving elements, and lighting the backlight for a predetermined period at the timing when the driving is completed. The display device according to claim 1, further comprising: The pixel driving element has initialization function means for determining and storing an address of the pixel driving element itself,
2. The display device according to claim 1, wherein the comparison and collation unit compares and collates the pixel address signal separated by the separation unit and the address information stored in the initialization function unit. The power supply circuit outputs positive or negative voltage or current,
The plurality of pixel driving elements are arranged in a matrix on a predetermined substrate,
Two power supply lines of positive polarity and negative polarity are respectively connected to the horizontal direction terminals of the pixel driving elements arranged in a matrix, and a display is respectively provided to the vertical direction terminals of the pixel driving elements. A signal line for supplying a pixel drive signal is connected,
The two power supply lines are wired so that power supply lines of the same polarity are connected to the pixel driving elements located on both sides,
4. The display according to claim 3, wherein the signal line is wired so as to transmit the display pixel driving signal input from the primary side to a pixel driving element at the next stage on the secondary side. apparatus.   The initialization function means controls the switching element connected to the signal line to electrically cut off the signal line so that a signal is not transmitted to the pixel driving element on the next stage on the secondary side. In this state, the address information represented by the pixel address signal input from the primary side is determined and stored as the address of the pixel drive element itself, and the switching element is controlled to shut off the signal line 5. The pixel address signal including address information obtained by adding 1 to the stored address information is transmitted to the next pixel drive element via the signal line. The display device described. In a driving method of a display device that displays an image by driving a plurality of pixels,
A predetermined voltage or current is supplied from a power supply circuit, and each of these signals is generated from a display pixel driving signal in which a color signal, a luminance signal, a pixel address signal, and a pixel driving timing signal are superimposed by a plurality of pixel driving elements that drive each pixel. Separating step of separating,
A comparison and collation step of comparing and collating the separated pixel address signal and the address information of the pixel driving element;
A storage step of temporarily storing the luminance signal separated in the separation step in a predetermined storage unit;
When the comparison / collation result in the comparison / collation step indicates that the pixel address signal and the address information of the pixel drive element are the same, based on the pixel drive timing signal separated in the separation step, And a pixel driving step of driving the pixels in synchronism with the timing of the luminance signal read from the storage means.

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