JP2014006401A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of mounting with disposing circuit elements other than scan drive circuits disposed therein at implementation while avoiding deterioration of image quality.SOLUTION: A display device 100 has plural unit circuits 131A and 131B connected in a multi-step manner. The plural unit circuits 131A and 131B are connected to scanning lines 125A and 125B included in an identical row. The plural light-emitting pixel 111A and 111B, the plural unit circuits 131A and plural unit circuits 131B are disposed at a substantially identical pitch in a row direction in a row in a display area 110. The plural unit circuits 131A, inspection pads 123A and 123B and plural unit circuits 131B are disposed in line in this order in an area along the identical side of the display area 110 in a peripheral area 120. The length of the scanning line 125A and the length of the scanning line 125B is substantially the same.

Description

  The present invention relates to a display device having a display area having a plurality of display pixels arranged in a matrix and a peripheral area provided along at least one side of the display area.

  In a pixel circuit in a display pixel of an active matrix liquid crystal display or an organic EL display, a thin film transistor (TFT) for pixel selection using amorphous silicon as a material is used. In order to drive the pixel selection TFT, a driver circuit (also referred to as a drive circuit) is disposed in the peripheral area of the display. This driver circuit is composed of a logic device for outputting a drive pulse for turning on and off the selection TFT.

  This selection TFT is arranged at the intersection of a plurality of scanning lines and a plurality of signal lines. The driver circuit writes a data signal from the signal line to each pixel or causes the pixel to emit light by turning on the selection TFT of the pixel row selected through the scanning line. Here, as a driver circuit that outputs a selection signal for each pixel row with respect to the selected pixel row, for example, a shift register can be cited.

  Patent Document 1 discloses an organic electroluminescence device including a scan driver having a driver circuit for driving a half pixel row of a display area and a driver circuit for driving the other half pixel row of the display pixel. A configuration of the display device is disclosed.

  FIG. 10 is a block diagram showing the configuration of the organic light emitting display device described in Patent Document 1. In FIG.

  An organic light emitting display 700 shown in FIG. 1 drives a first scanning drive circuit 701 for driving display pixels belonging to half of the display area and a display pixel belonging to the other half of the display area. A scanning drive unit 710 including a second scanning drive circuit 702 for switching the switching unit 703 to electrically connect or disconnect the first scanning drive circuit 701 and the second scanning drive circuit 702. In one embodiment of the organic light emitting display 700, the first scan driver circuit 701 and the second scan driver circuit 702 simultaneously receive a start pulse, and the first scan driver circuit 701 and the second scan driver circuit 702 receive scan signals. Are output in parallel.

  As a result, the organic light emitting display 700 described in Patent Document 1 shortens the time during which the second frame composed of the black image is expressed.

JP 2010-176114 A

  When realizing a display device in which the scan driving unit disclosed in Patent Document 1 is divided into a plurality of scan drive circuits, it is necessary to provide circuit elements such as switches other than the scan drive circuit.

  However, in practice, it is difficult to secure a necessary area on the substrate and arrange circuit elements other than the scanning drive circuit on the division boundary. In particular, it becomes more difficult to cope with an increase in circuit scale to be arranged, narrowing of the frame of the panel, and high definition.

  Accordingly, an object of the present invention is to provide a display device that can suppress degradation of image quality and can arrange circuit elements other than the scan drive circuit at the time of mounting.

  In order to solve the above problems, a display device according to one embodiment of the present invention includes a display region including a plurality of display pixels arranged in a matrix, and a periphery provided along at least one side of the display region The plurality of display pixels constitute a plurality of drive blocks having a plurality of display pixel rows as one drive block, and the display device scans and drives one drive block. A first scan drive circuit; a second scan drive circuit for scanning and driving another drive block adjacent to the one drive block; and a first connection wiring provided for each row of the one drive block A second connection wiring provided for each row of the other drive block, and a circuit element electrically connected to at least one of the first scan drive circuit and the second scan drive circuit Comprising the first Each of the scan drive circuit and the second scan drive circuit has a plurality of unit circuits connected in a one-to-one correspondence to the corresponding drive block row, and the plurality of unit circuits. Are connected to the first or second connection wiring belonging to the same row, the pitch in the column direction of the plurality of display pixels in the display region, and the plurality of unit circuits included in the first scan driving circuit. The pitch in the column direction and the pitch in the column direction of the plurality of unit circuits included in the second scan drive circuit are substantially the same, and the first scan drive circuit, the circuit element, and The second scanning drive circuit is arranged in this order in a region along the same side of the display region in the peripheral region, and the length of the first connection wiring and the length of the second connection wiring are: Substantially the same.

  According to the present invention, it is possible to provide a display device that can suppress degradation of image quality and can arrange circuit elements other than the scanning drive circuit during mounting.

1 is a block diagram illustrating a configuration of a display device according to Embodiment 1. FIG. It is a block diagram which shows the specific structure of a 1st scanning drive circuit. It is a schematic diagram which shows the transfer direction of a 1st scanning drive circuit. It is a schematic diagram which shows the transfer direction of a 2nd scanning drive circuit. It is the schematic diagram which expanded a part of FIG. It is the layout figure to which a part of FIG. 1 was expanded. 6 is a block diagram illustrating a configuration of a display device according to Embodiment 2. FIG. It is a block diagram which shows the structure of the display apparatus in which a part of test pad is provided in the peripheral side rather than the 1st scanning drive circuit and the 2nd scanning drive circuit. It is a block diagram which shows the structure of the display apparatus which has three drive blocks. 1 is an external view of a thin flat TV incorporating a display device according to the present invention. It is a block diagram which shows the structure of the organic electroluminescent display apparatus described in patent document 1. FIG. It is a block diagram which shows the structure of a general display apparatus. It is a block diagram which shows the structure of the display apparatus which has a some drive block for demonstrating a subject. It is a block diagram which expands and shows a part of structure of the other display apparatus which has a some drive block for demonstrating a subject.

(Knowledge that became the basis of the present invention)
The present inventor has found that the following problems occur with respect to a display device in which the scan driving unit described in the “Background Art” section is divided into a plurality of scan driving circuits.

  FIG. 11 is a block diagram illustrating a configuration of a general display device. Note that the layout of each component shown in the figure (a display area 810 including a plurality of light-emitting pixels 801, a control circuit 820, a scan driving circuit 830, a signal line driving circuit 840, and an inspection pad 850) includes the display area 810. This is a simulation of the arrangement when viewed from above.

  The control circuit 820 controls the timing of the scanning signal output from the scanning driving circuit 830 and the timing of outputting the signal voltage output from the signal line driving circuit 840.

  The light emitting pixels 801 are arranged in a matrix in the display region 810 and emit light according to a signal voltage supplied from the signal line driver circuit 840. The timing of this light emission is controlled by a scanning signal supplied from the scanning drive circuit 830.

  The scan driving circuit 830 includes a plurality of unit circuits connected in multiple stages (also referred to as cascade connection). Each unit circuit is provided in one-to-one correspondence with each row of the display area, and is arranged in the same row as the corresponding row. Accordingly, the scan driving circuit 830 scans the light-emitting pixels 801 arranged in a matrix in a row sequential manner.

  The signal line driver circuit 840 outputs a signal voltage corresponding to the luminance of the light emitting pixel 801 under the control of the control circuit 820.

  The inspection pad 850 is a metal pad that is electrically connected to the scan driving circuit 830. At the time of inspection, the waveform transferred to the scanning drive circuit 830 can be monitored by bringing the probe into contact with the inspection pad 850. In other words, a waveform transferred by a plurality of unit circuits connected in multiple stages can be monitored. Thereby, it is possible to inspect whether or not the operation of the scan driving circuit 830 is appropriate.

  The display device 800 configured in this manner emits light when the light emitting pixels 801 arranged in a matrix are scanned in a row sequence.

  By the way, in recent years, as the display area becomes larger, a display device having a plurality of drive blocks in which a plurality of light emitting pixel rows are used as one drive block is considered. However, when the above-described inspection pad is provided in a display device having a plurality of drive blocks, the following problem occurs.

  FIG. 12 is a block diagram illustrating a configuration of a display device having a plurality of drive blocks for explaining the problem. Note that the arrangement layout of each component shown in the figure is a simulation of the arrangement when the display area 910 is viewed from above.

  The display device 900 shown in the figure is largely different from the display device 800 shown in FIG. 11 in that the display area 910 is block-driven. Specifically, the first drive block 912A configured by the light emitting pixels 911A belonging to the half row of the display area 910 and the second drive block configured by the light emitting pixels 911B belonging to the other half row of the display area 910. 912B is controlled independently of each other to realize block driving.

  When the layout in which each row of the display area and the unit circuit of the scanning drive circuit are the same row as described with reference to FIG. 11 is applied to the display device 900, an arrangement area for the inspection pads 923A and 923B is secured. Therefore, it is necessary to leave a sufficient space between the first scan drive circuit 922A and the second scan drive circuit 922B. As a result, an area where no light emitting pixels are arranged is formed between the first drive block 912A driven by the first scan drive circuit 922A and the second drive block 912B driven by the second scan drive circuit 922B. . In other words, in the display region 910, the pitches in the column direction of the light emitting pixels 911A and 911B arranged in a matrix cannot be made the same. The column direction of the light emitting pixels 911A and 911B is the same as the transfer direction of the first scanning drive circuit 922A and the second scanning drive circuit 922B.

  That is, in the display device 800 that is not block-driven, the arrangement layout of the light emitting pixels 801 in the display area 810 is not affected even if the inspection pad 850 is arranged. However, in the display device 900 that is driven by the block, by arranging the inspection pads 923A and 923B, the arrangement layout of the light emitting pixels 911A and 911B in the display area 910 is not uniform, and the image quality is deteriorated.

  Conversely, when realizing a display device that has a plurality of drive blocks and block-drives a display region in which the pitches of the plurality of light emitting pixels are the same in the column direction, a region for arranging the inspection pads is secured. Can not do it.

  FIG. 13 is an enlarged block diagram illustrating a part of the configuration of another display device having a plurality of drive blocks for explaining the problem. In addition, the arrangement layout of each component shown in the figure simulates the arrangement when a display area including a plurality of light emitting pixels is viewed from above.

  The display device shown in the figure includes a plurality of light emitting pixels 981 arranged in a matrix at the same pitch in the column direction, and a first unit circuit 982 arranged in the same row as each row of the plurality of light emitting pixels. A scan drive circuit 922A and a second scan drive circuit 922B are provided. The first scan drive circuit 922A drives the first drive block, and the second scan drive circuit 922B drives the second drive block.

  However, the layout in which each row of the display region and the unit circuit of the scanning drive circuit as described with reference to FIG. 11 are in the same row is applied to a display device in which the pitch in the column direction of the light emitting pixels 981 in the display region is constant. In this case, as is apparent from FIG. 13, the region between the unit circuit 982 located in the last row of the first scan drive circuit 922A and the unit circuit 982 located in the first row of the second scan drive circuit 922B. It is difficult to secure an area for arranging an inspection pad in X.

  That is, when the configuration of a display device having a circuit element (for example, an inspection pad) connected to a scan driving circuit is applied to a display device that is block-driven, it is difficult to newly arrange a circuit element.

  Meanwhile, as shown in FIG. 13, the display device has a configuration in which a plurality of light emitting pixels 981 arranged in a matrix at the same pitch in the column direction form a first drive block and a second drive block. However, the test pads 923A and 923B are arranged by disposing the arrangement axis of the unit circuits 982 included in the first scan drive circuit 922A and the arrangement axis of the unit circuits 982 included in the second scan drive circuit 922B. A configuration that secures an area to be arranged is conceivable. For example, the arrangement is such that the distance from the second drive block to the second scan drive circuit 922B is longer than the distance from the first drive block to the first scan drive circuit 922A.

  However, in such a configuration, the scan line 925A connected to each unit circuit 982 of the first scan drive circuit 922A and the scan line 925B connected to each unit circuit 982 of the second scan drive circuit 922B. The length will be different. In other words, the length of the scanning line 925A for driving the first drive block is different from the length of the scanning line 925B for driving the second drive block.

  As a result, the wiring resistance and parasitic capacitance caused by the scanning line 925A differ from the wiring resistance and parasitic capacitance caused by the scanning line 925B longer than the scanning line 925A. That is, variations in wiring resistance and parasitic capacitance of the scanning lines 925A and 925B increase. As a result, the plurality of light emitting pixels 981 cannot be driven uniformly, and the image quality deteriorates.

  As described above, in a display device that performs block driving, it is difficult to suppress deterioration in image quality and to arrange circuit elements other than the scanning driving circuit.

  In order to solve such a problem, a display device according to one embodiment of the present invention is provided along a display region having a plurality of display pixels arranged in a matrix and at least one side of the display region. The display device includes a peripheral region, wherein the plurality of display pixels constitute a plurality of drive blocks having a plurality of display pixel rows as one drive block, and the display device scans and drives one drive block. A first scan drive circuit that performs scanning, a second scan drive circuit that scans and drives another drive block adjacent to the one drive block, and a first connection provided for each row of the one drive block A circuit element electrically connected to at least one of the wiring, the second connection wiring provided for each row of the other driving block, and the first scanning driving circuit and the second scanning driving circuit And comprising Each of the one scan driving circuit and the second scan driving circuit has a plurality of unit circuits connected in a one-to-one manner in a corresponding drive block row, and the plurality of unit circuits. Each of the unit circuits is connected to the first or second connection wiring belonging to the same row, the pitch in the column direction of the plurality of display pixels in the display region, and the plurality of units included in the first scan driving circuit. The pitch in the column direction of the circuit and the pitch in the column direction of the plurality of unit circuits included in the second scan drive circuit are substantially the same, and the first scan drive circuit and the circuit The elements and the second scanning drive circuit are arranged in this order in a region along the same side of the display region in the peripheral region, and the length of the first connection wiring and the length of the second connection wiring Are substantially identical.

  Thereby, the circuit elements connected to the scanning drive circuit can be arranged in the peripheral region.

  Further, since the lengths of the first connection wiring and the second connection wiring are substantially the same, variations in wiring resistance due to variations in the wiring lengths of the first connection wiring and the second connection wiring and parasitic capacitances are caused. Can be reduced. Therefore, the first scan drive circuit and the second scan drive circuit can uniformly drive a plurality of display pixel rows constituting one drive block and a plurality of display pixel rows constituting another drive block. . As a result, the display device can suppress deterioration in image quality.

  As described above, the display device according to one embodiment of the present invention can suppress deterioration in image quality and can arrange circuit elements.

  Further, since the first scan drive circuit, the circuit element, and the second scan drive circuit are arranged in this order, the circuit elements are compared with the arrangement in which the circuit elements are not arranged in the first and second scan drive circuits. The frame can be narrowed.

  In the display device according to one embodiment of the present invention, each of the plurality of unit circuits included in the first scan driver circuit corresponds to the circuit element in the first direction as viewed from the corresponding display pixel row. Each of the plurality of unit circuits included in the second scanning drive circuit is shifted by a predetermined amount in the second direction opposite to the first direction when viewed from the corresponding display pixel row. It may be arranged.

  Thereby, the length of the 1st connection wiring and the length of the 2nd connection wiring can be made substantially the same easily. Specifically, the shift amount between each unit circuit included in the first scan driving circuit and the display pixel row corresponding to the unit circuit corresponds to each unit circuit included in the second scan driving circuit and the unit circuit. The amount of deviation from the display pixel row is the same. As a result, the length of the first connection wiring and the second length are adjusted by matching the arrangement axis of the plurality of unit circuits included in the first scan drive circuit with the arrangement axis of the plurality of unit circuits included in the second scan drive circuit. The length of the connection wiring can be made substantially the same.

  In the display device according to one embodiment of the present invention, at least part of the first connection wiring and at least part of the second connection wiring are in the row direction of the plurality of display pixels in the peripheral region. It may be non-parallel.

  In the display device according to one embodiment of the present invention, the one drive block may include half of the display pixel rows, and the other drive block may include the other half of the display pixel rows.

  In the display device according to one embodiment of the present invention, the first scan driver circuit and the second scan driver circuit may be formed by the same process as the plurality of display pixels.

  That is, the display device according to one embodiment of the present invention is a driver built-in type.

  In the display device according to one embodiment of the present invention, the circuit element may be an inspection pad used when inspecting the first scan driving circuit or the second scan driving circuit.

  Thus, at the time of inspection, it is possible to inspect whether or not the first scanning drive circuit and the second scanning drive circuit are operating normally by contacting the probe with the inspection pad and checking the signal. For example, when the test pad is electrically connected to the final stage of the multistage connected unit circuits of the first and second scan drive circuits, the signal confirmed at the time of the test can be a desired signal. Thus, it can be determined that the first and second scanning drive circuits are operating normally.

  In the display device according to one embodiment of the present invention, the first and second scan driving circuits include the one drive block and the other one drive block via the first and second connection wirings. And the circuit element controls timing for starting supply of the scan drive signal to at least one of the first scan drive circuit and the second scan drive circuit. It may be a start pulse input line for inputting a start pulse which is a signal.

  Thereby, the drive timing of the first drive block and the drive timing of the second drive block can be set independently. Therefore, it is possible to drive the first drive block and the second drive block at a drive timing suitable for a large screen.

  Hereinafter, display devices according to embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of the constituent elements shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a display device according to Embodiment 1 of the present invention.

  The display device 100 shown in the figure has a display area 110 and a peripheral area 120 provided along the periphery of the display area 110. Further, the display device 100 includes a plurality of light emitting pixels 111A and 111B, control circuits 121A and 121B, a first scanning drive circuit 122A, a second scanning drive circuit 122B, inspection pads 123A and 123B, and signal line driving. Circuits 124A and 124B, scanning lines 125A and 125B, and signal lines 126A and 126B are provided.

  Here, the plurality of light emitting pixels 111A and 111B are arranged in the display region 110, and control circuits 121A and 121B, a first scanning drive circuit 122A, a second scanning drive circuit 122B, inspection pads 123A and 123B, and signals The line drive circuits 124A and 124B are disposed in the peripheral region 120, and the scanning lines 125A and 125B and the signal lines 126A and 126B are continuously disposed in the display region 110 and the peripheral region 120.

  Next, each component will be described in detail.

  The plurality of light emitting pixels 111A and 111B are an example of the display pixel of the present invention, and are arranged in a matrix of 2m rows and n columns, and constitute a plurality of driving blocks having a plurality of adjacent light emitting pixel rows as one driving block. To do. Specifically, the m rows of light emitting pixels 111A located in the first to m rows constitute the first drive block 112A, and the m rows of light emitting pixels 111B located in the (m + 1) to 2m rows are the second drive block. 112B is configured. The light emitting pixel 111A is connected to the scanning line 125A and the signal line 126A, and emits light at a voltage corresponding to the signal voltage supplied from the signal line driving circuit 124A via the signal line 126A. On the other hand, the light emitting pixel 111B is connected to the scanning line 125B and the signal line 126B, and emits light at a voltage corresponding to the signal voltage supplied from the signal line driving circuit 124B via the signal line 126B. The timing of light emission of the light emitting pixels 111A and 111B is controlled by a scan drive signal supplied from the first scan drive circuit 122A and the second scan drive circuit 122B via the scan lines 125A and 125B.

  The control circuit 121A is provided corresponding to the first drive block 112A and controls the output timing of the scan drive signal output from the first scan drive circuit 122A. On the other hand, the control circuit 121B is provided corresponding to the second drive block 112B, and controls the output timing of the scan drive signal output from the second scan drive circuit 122B. The control circuit 121A controls the signal voltage output from the signal line driver circuit 124A, while the control circuit 121B controls the signal voltage output from the signal line driver circuit 124B.

  The first scan drive circuit 122A is provided corresponding to the first drive block 112A, and scan drive signals are supplied to the light emitting pixels 111A included in the first drive block 112A via the scan line 125A according to the control of the control circuit 121A. Supply. On the other hand, the second scan drive circuit 122B is provided corresponding to the second drive block 112B, and scans each light emitting pixel 111B included in the second drive block 112B via the scan line 125B under the control of the control circuit 121B. Supply drive signals.

  Further, the first scanning drive circuit 122A and the second scanning drive circuit 122B are formed by the same process as the light emitting pixels 111A and 111B. That is, the display device 100 is a display device with a built-in driver. The detailed configuration of the first scan drive circuit 122A and the second scan drive circuit 122B will be described later.

  Each of the inspection pads 123A and 123B is an example of a circuit element of the present invention, and is used when inspecting the first scan drive circuit 122A and the second scan drive circuit 122B. Specifically, the inspection pad 123A is electrically connected to the first scanning drive circuit 122A, and the inspection pad 123B is electrically connected to the second scanning drive circuit 122B. Thus, at the time of inspection, the probe is brought into contact with the inspection pad 123A to confirm the signal, whereby the input signal input from the control circuit 121A to the first scanning drive circuit 122A is correctly transmitted in the first scanning drive circuit 122A. It can be checked whether or not That is, it can be inspected whether or not the first scanning drive circuit 122A is operating normally. Similarly, at the time of inspection, it is possible to inspect whether or not the second scanning drive circuit 122B is operating normally by contacting the probe with the inspection pad 123B and checking the signal.

  The signal line driving circuit 124A is provided corresponding to the first driving block 112A, and supplies a signal voltage to the light emitting pixels 111A included in the first driving block 112A via the signal line 126A in accordance with the control of the control circuit 121A. . On the other hand, the signal line driver circuit 124B is provided corresponding to the second drive block 112B, and applies a signal voltage to the light emitting pixels 111B included in the second drive block 112B via the signal line 126B according to the control of the control circuit 121A. Supply.

  The scanning line 125A is an example of the first connection wiring of the present invention, and is provided for each row of the first driving block 112A, and supplies a scanning driving signal from the first scanning driving circuit 122A to the first driving block 112A. On the other hand, the scanning line 125B is an example of the second connection wiring of the present invention, and is provided for each row of the second driving block 112B, and supplies the scanning driving signal from the second scanning driving circuit 122B to the second driving block 112B. To do. Here, the scanning lines 125A and 125B are continuously formed from the first and second scanning driving circuits 122A and 122B to the respective light emitting pixels 111A and 111B in the display region 110. Of these, at least the scanning line 125A is included. A part and at least a part of the scanning line 125B are non-parallel to the row direction of the display area 110 in the peripheral area 120.

  In addition, the length of the scanning line 125A and the length of the scanning line 125B are substantially the same. As a result, the variation in the wiring lengths of the scanning lines 125A and 125B for each row can be substantially reduced to zero, and as a result, the variation in the wiring resistance and the variation in the parasitic capacitance due to the variation in the wiring length are suppressed. can do. Therefore, the first scan driving circuit 122A and the second scan driving circuit 122B uniformly drive the m rows of light emitting pixels 111A included in the first drive block 112A and the m rows of light emitting pixels 111B included in the second drive block 112B. Can scan. As a result, the display device 100 can reduce deterioration in image quality of the display area 110.

  The signal line 126A is provided for each column of the first drive block 112A, and supplies a signal voltage from the signal line drive circuit 124A to the first drive block 112A. On the other hand, the signal line 126B is provided for each column of the second drive block 112B, and supplies a signal voltage from the signal line drive circuit 124B to the second drive block 112B.

  In the display device 100 configured as described above, the first drive block 112A and the second drive block 112B are independent of each other by the first scan drive circuit 122A and the second scan drive circuit 122B, which are different scan drive circuits. Driven. That is, the display device 100 according to the present embodiment emits light by block driving.

  Next, specific configurations of the first scan drive circuit 122A and the second scan drive circuit 122B will be described.

  FIG. 2 is a block diagram showing a specific configuration of the first scan driving circuit 122A. In the figure, a clock signal generator 132, which is a peripheral circuit of the first scan driving circuit 122A, is also drawn. The clock signal generator 132 is not particularly shown in FIG. 1, but may be independent of other components, or may be incorporated in another component such as the control circuit 121A, for example.

  As shown in the figure, the first scanning drive circuit 122A is provided corresponding to the first drive block 112A, and is provided in m units connected in multiple stages provided corresponding to each row of the first drive block 112A. A circuit 131A is provided. Each of these m unit circuits 131A is connected to a scanning line 125A corresponding to the same row. That is, the light emitting pixels 111A in the k-th row (k is 1 ≦ k ≦ m) of the first drive block 112A are connected to the unit circuit 131A corresponding to the k-th row of the first drive block 112A via the corresponding scanning line 125A. Connected with.

  The unit circuit 131A corresponding to the first row receives the input signal IN1 by inputting the clock signal CLK output from the clock signal generator 132 and the input signal IN1 output from the control circuit 121A at a predetermined timing. The scan drive signal SCAN1 having the same output period as the ON voltage output period of the input signal IN1 (hereinafter referred to as an output period) is output with a delay of half a clock cycle. Further, the unit circuit 131A corresponding to the second row operates using the scanning drive signal SCAN1 corresponding to the first row as an input signal. That is, when the clock signal CLK and the input signal IN2 that is the same signal as the scan drive signal SCAN1 are input at a predetermined timing, the output period of the input signal IN1 is delayed by a half clock cycle with respect to the scan drive signal SCAN1. The scan drive signal SCAN2 having the same output period as is output. Accordingly, the unit circuit 131A corresponding to the k-th row receives the clock signal CLK and the input signal INk, which is the same signal as the scan drive signal SCAN (k−1), at a predetermined timing. A scan drive signal SCANk having the same output period as the output period of the input signal IN1, which is delayed by a half clock period with respect to SCAN (k−1), is output. The input signal IN1 corresponds to a start pulse signal for controlling the timing for starting the supply of the scanning drive signals SCAN1 to SCANm.

  Here, in the first scan driving circuit 122A, the unit circuit 131A corresponding to the m-th row further outputs the scan drive signal SCANm to the inspection pad 123A. Thus, at the time of inspection, it is possible to confirm whether or not the first scanning drive circuit 122A is operating normally by contacting the probe to the inspection pad 123A and checking the scanning drive signal SCANm. For example, when the clock cycle is T, the signal obtained by bringing the probe into contact with the inspection pad 123A is delayed by (m × T) / 2 with respect to the input signal IN1, and the output period of the input signal IN1 It can be confirmed that the first scanning drive circuit 122A is operating normally when the output period is the same.

  On the other hand, the second scanning drive circuit 122B has substantially the same configuration, but the signal transfer direction in the scanning drive circuit is different.

  3A is a schematic diagram showing the transfer direction of the first scan drive circuit 122A, and FIG. 3B is a schematic diagram showing the transfer direction of the second scan drive circuit 122B. Here, the second scanning drive circuit 122B includes m unit circuits 131B connected in multiple stages and provided corresponding to each row of the second drive block 112B.

  As shown in FIG. 3A, in the first scanning drive circuit 122A, the input signal IN1 input to the unit circuit 131A in the first row is sequentially transferred by the unit circuit 131A connected in multiple stages. On the other hand, as shown in FIG. 3B, in the second scanning drive circuit 122B, the input signals input to the unit circuits 131B in the m-th row are sequentially transferred by the unit circuits 131B connected in multiple stages.

  That is, the unit circuit 131B corresponding to the k-th row of the second drive block 112B composed of the m light-emitting pixels 111B located in the (m + 1) to 2m-th rows has the clock signal CLK and the scan drive signal SCAN (m + k + 1). ), Which is the same signal as IN (m + k), is input at a predetermined timing, is delayed by a half clock cycle with respect to the scanning drive signal SCAN (m + k + 1), and has the same output as the output period of the input signal IN (2m). A scan drive signal SCAN (m + k) having a period is output. Note that the input signal IN (2m) corresponds to a start pulse signal for controlling the timing for starting the supply of the scan drive signals SCAN (m + 1) to SCAN (2m).

  Here, the unit circuit 131B corresponding to the first row of the second drive block 112B further outputs the scan drive signal SCAN (m + 1) to the inspection pad 123B. Thus, at the time of inspection, it is possible to confirm whether or not the second scanning drive circuit 122B is operating normally by contacting the probe to the inspection pad 123B and checking the scanning drive signal SCAN (m + 1). . For example, when the clock period is T, the signal obtained by bringing the probe into contact with the inspection pad 123B is delayed by (m × T) / 2 with respect to the input signal IN (2m), and the input signal IN When the output period is the same as the output period of (2m), it can be confirmed that the second scanning drive circuit 122B is operating normally.

  Next, the scanning lines 125A and 125B, the first scanning driving circuit 122A and the second scanning driving circuit 122B, and the first driving block 112A and the second driving block 112B will be described focusing on the layout.

  4 is a schematic diagram enlarging a part of FIG. 1, and FIG. 5 is a layout diagram enlarging a part of FIG. Note that the first scan drive circuit 122A shown in FIG. 4 corresponds to the first scan drive circuit 122A arranged on the right side of the display region 110 of the two first scan drive circuits 122A shown in FIG. . Similarly, the second scan drive circuit 122B shown in FIG. 4 corresponds to the second scan drive circuit 122B arranged on the right side of the display area 110, out of the two second scan drive circuits 122B shown in FIG. To do.

  Here, as shown in FIG. 5, the pitch p1 in the column direction of the plurality of light emitting pixels 111A and 111B in the display region 110, the pitch p2 in the column direction of the plurality of unit circuits 131A included in the first scanning drive circuit 122A, The pitch p3 in the column direction of the plurality of unit circuits 131B included in the second scan driving circuit 122B satisfies the following expression.

      p1 = p2 = p3

  In addition, even if these are not completely the same, it is sufficient that they are substantially the same. The fact that they are substantially the same is preferably within 5 percent, more preferably within 1 percent.

  In addition, each of the plurality of unit circuits 131A included in the first scan driving circuit 122A is arranged so as to be shifted by a predetermined amount corresponding to the inspection pads 123A and 123B in the first direction when viewed from the corresponding light emitting pixel row. Each of the plurality of unit circuits 131B included in the two-scan driving circuit 122B is arranged with a predetermined amount corresponding to the test pads 123A and 123B in the second direction when viewed from the corresponding light emitting pixel row. Here, the predetermined amount corresponding to the inspection pads 123A and 123B corresponds to, for example, half the length of the inspection pads 123A and 123B in the column direction.

  Specifically, the first scanning drive circuit 122A is arranged so as to be shifted upward from the first drive block 112A. In other words, the unit circuit 131A corresponding to the k-th row of the first drive block 112A is arranged at a position shifted to the (k−1) -th row side. On the other hand, the second scanning drive circuit 122B is arranged so as to be shifted downward from the second drive block 112B. In other words, the unit circuit 131B corresponding to the kth row of the second drive block 112B is arranged at a position shifted to the (k + 1) th row side.

  Here, the amount by which the unit circuit 131A corresponding to the kth row of the first drive block 112A is shifted upward with respect to the light emitting pixels 111A in the same row corresponds to the shift amount d1, and the kth row of the second drive block 112B. Assuming that the shift amount d2 is the amount by which the unit circuit 131B is shifted downward with respect to the light emitting pixels 111B in the same row, the shift amount d1 and the shift amount d2 satisfy the following expression.

      d1 = d2

  In addition, even if these are not completely the same, it is sufficient that they are substantially the same. The fact that they are substantially the same is preferably within 5 percent, more preferably within 1 percent.

  Thereby, the length of the scanning line 125A and the length of the scanning line 125B can be easily made substantially the same. Specifically, as shown in FIG. 5, the arrangement axis of the plurality of unit circuits 131A included in the first scan driving circuit 122A and the arrangement axis of the plurality of unit circuits 131B included in the second scan driving circuit 122B are made to coincide. In addition, the scanning lines 125A and 125B are wired at the shortest distance in parallel and perpendicular to the row direction of the display region 110, whereby the length of the scanning line 125A can be made substantially the same as the length of the scanning line 125B.

  As described above, the display device 100 according to the first embodiment includes the inspection pads 123A and 123B electrically connected to the first scan drive circuit 122A and the second scan drive circuit 122B, and includes the first scan drive circuit. Each of 122A and the second scanning drive circuit 122B includes a plurality of unit circuits 131A and 131B connected in a one-to-one correspondence to the corresponding drive block row, and includes a plurality of unit circuits 131A. And 131B are connected to the scanning line 125A or the scanning line 125B belonging to the same row, the pitch in the column direction of the plurality of light emitting pixels 111A and 111B in the display region 110, and the plurality of units included in the first scanning driving circuit 122A. The pitch in the column direction of the circuit 131A and the pitch in the column direction between the plurality of unit circuits 131B included in the second scan driving circuit 122B Are substantially the same, and the first scanning drive circuit 122A, the inspection pads 123A and 123B, and the second scanning drive circuit 122B are arranged in a region along the same side of the display region 110 in the peripheral region 120. Arranged in this order, the length of the scanning line 125A and the length of the scanning line 125B are substantially the same. Specifically, the length of all the scanning lines 125A and the length of all the scanning lines 125B are substantially the same, and the pitch in the column direction of the plurality of light emitting pixels 111A and 111B in the display region 110 is The pitch in the column direction of the plurality of unit circuits 131A included in the one scan drive circuit 122A and the pitch in the column direction of the plurality of unit circuits 131B included in the second scan drive circuit 122B are substantially the same.

  Accordingly, the display device 100 according to the present embodiment can arrange the inspection pads 123A and 123B connected to the first and second scanning drive circuits 122A and 122B in the peripheral region 120.

  Further, by making the lengths of the scanning lines 125A and 125B substantially the same, variations in wiring resistance and parasitic capacitance due to variations in the wiring lengths of the scanning lines 125A and 125B can be reduced. Therefore, the first scan driving circuit 122A and the second scan driving circuit 122B uniformly drive the plurality of light emitting pixel rows constituting the first drive block 112A and the plurality of light emitting pixel rows constituting the second drive block 112B. it can. That is, the display area 110 can be driven uniformly. As a result, the display device 100 according to Embodiment 1 can suppress deterioration in image quality.

  As described above, the display device 100 according to the present embodiment suppresses the deterioration of image quality and enables the placement of the inspection pads 123A and 123B.

  Further, the first scanning drive circuit 122A, the inspection pads 123A and 123B, and the second scanning drive circuit 122B are arranged in this order, so that the inspection pads 123A and 123B are arranged in the first scanning drive circuit 122A. Compared with an arrangement that is not aligned with the second scanning drive circuit 122B, the frame can be narrowed.

  In the display device 100 according to the present embodiment, the first scan drive circuit 122A scans the first drive block 112A sequentially from the first row to the m-th row, and the second scan drive circuit 122B is the second drive block 112B. Are sequentially scanned from the m-th row to the first row. As a result, the mth row of light emitting pixels 111A of the first drive block 112A and the first row of light emitting pixels 111B of the second drive block 112B are driven simultaneously. That is, the first scan driving circuit 122A sequentially scans from the first row to the mth light emitting pixel row, and the second scan driving circuit 122B scans sequentially from the second m row to the (m + 1) th light emitting pixel row. The mth pixel row and the (m + 1) th pixel row are driven simultaneously.

  Thereby, in the image displayed in the display area 110, the boundary between the first drive block 112A and the second drive block 112B is not conspicuous, and the image quality is improved.

(Embodiment 2)
The display device according to the present embodiment is substantially the same as the display device 100 according to the first embodiment, except that the scanning lines are arranged in parallel with the row direction of the display region. Hereinafter, the present embodiment will be described with reference to the drawings.

  FIG. 6 is a block diagram illustrating a configuration of the display device according to the present embodiment. FIG. 6 schematically shows the layout of the display device according to this embodiment.

  Compared with the display device 100 shown in FIG. 1, the display device 200 shown in FIG. 1 has scanning lines 225 A and 225 B instead of the scanning lines 125 A and 125 B, the first driving block 112 A and the second driving block 112 B, A first drive block 212A and a second drive block 212B are provided.

  Scan lines 225A and 225B differ from scan lines 125A and 125B in Embodiment 1 in that they are arranged in parallel to the row direction of display region 110. That is, in Embodiment 1, a part of the scanning line 125A and a part of the scanning line 125B are arranged in the peripheral area 120 in a non-parallel manner with respect to the row direction of the display area 110. The scanning lines 225 </ b> A and 225 </ b> B are arranged in the peripheral region 120 in parallel with the row direction of the display region 110.

  The first drive block 212A is substantially the same as the first drive block 112A in Embodiment 1, but the positional relationship between the light emitting pixels 111A and the scanning lines 225A in the same row is different. Similarly, the second drive block 212B is substantially the same as the second drive block 112B in Embodiment 1, but the positional relationship between the light emitting pixels 111B and the scanning lines 225B in the same row is different.

  Specifically, the light emitting pixels 111A in the k-th row of the first drive block 212A are arranged in the first drive block 212A via the scanning line 225A arranged in the peripheral region 120 in parallel with the row direction of the display region 110. Connected to the unit circuit 131A corresponding to the k-th row. Similarly, the light emitting pixels 111B in the k-th row of the second drive block 212B are connected to the second drive block 212B through the scanning lines 225B arranged in the peripheral region 120 in parallel with the row direction of the display region 110. It is connected to unit circuits 131B corresponding to k rows.

  As described above, the display device 200 according to the present embodiment has the scanning lines 225A and 225B arranged in parallel to the row direction of the display region 110, as compared with the display device 100 according to the first embodiment. Yes.

  Thereby, in the display device 200 according to the present embodiment, compared with the display device 100 according to the first embodiment, the length of the scanning line 225A is equal to the length of the scanning line 225B at the time of design and mounting. it can.

  Although the display device of the present invention has been described based on the embodiment, the display device according to the present invention is not limited to the above embodiment. Other embodiments realized by combining arbitrary components in the first and second embodiments, and various modifications conceivable by those skilled in the art without departing from the gist of the present invention to the first and second embodiments. Modifications obtained in this way are also included in the present invention.

  For example, in the above-described embodiments, the inspection pads 123A and 123B are not arranged on the peripheral side of the first scanning drive circuit 122A and the second scanning drive circuit 122B, but a part of the inspection pads 123A and 123B. This region may be arranged on the peripheral side of the first scanning drive circuit 122A and the second scanning drive circuit 122B.

  FIG. 7 is a block diagram illustrating a configuration of a display device in which a part of the inspection pad is provided on the peripheral side of the first scan drive circuit 122A and the second scan drive circuit 122B.

  The test pad 323A connected to the first scan drive circuit 122A and the test pad 323B connected to the second scan drive circuit 122B shown in the figure are the test pads provided in the display device 100 according to the first embodiment. Compared with 123A and 123B, the display device 300 is further arranged on the peripheral side. Thus, the display device 300 can mount larger inspection pads 323A and 323B than the display device 100. As a result, when the display device 300 is inspected, the alignment between the probe and the inspection pad is facilitated.

  In each of the above embodiments, the display device has two drive blocks. However, the number of drive blocks is not limited to two, and may be three, for example.

  FIG. 8 is a block diagram showing a configuration of a display device having three drive blocks.

  Compared with the display device 100 shown in FIG. 1, the display device 400 shown in the figure further drives the third drive block 412, the control circuit 421, and the third drive block 412 in accordance with the control of the control circuit 421. A third scan drive circuit 422 for performing the test, a test pad 423 electrically connected to the third scan drive circuit 422, and a scan drive signal from the third scan drive circuit 422 to the third drive block 412. Scanning line 425.

  Here, the first scanning drive circuit 122A, the test pad 123A, the test pad 123B, the second scan drive circuit 122B, the third scan drive circuit 422, and the test pad 423 are arranged in this order in the peripheral region 120. Has been. Further, the scanning line 425 is not parallel to the row direction of the display area 110 in the peripheral area 120.

  As a result, the display device 400 can have a larger screen than the display device 100.

  In each of the above embodiments, the unit circuits 131A and 131B in which the first scan drive circuit 122A and the second scan drive circuit 122B are connected in multiple stages are provided, but the signal line drive circuits 124A and 124B are further provided in multiple stages. You may have the unit circuit connected.

  Further, in each of the above embodiments, the first scanning drive circuit 122A and the second scanning drive circuit 122B are arranged along the column direction of the display region 110, but may be arranged along the row direction. That is, the rows and columns of the light emitting pixels 111A and 111B included in the display region 110 are switched, and the signal line driving circuits 124A and 124B are arranged along the column direction of the display region 110, and the first scanning driving circuit 122A, The inspection pad 123A, the inspection pad 123B, and the second scanning drive circuit 122B may be arranged along the row direction of the display area.

  Further, the circuit element disposed between the first scan drive circuit 122A and the second scan drive circuit 122B is not limited to the inspection pad. For example, the circuit element is a start pulse input line for inputting a start pulse, which is a signal for controlling the timing for starting the supply of the scan drive signal, to the first scan drive circuit 122A and the second scan drive circuit 122B. There may be. Thereby, the drive timing of the first drive block 112A and the drive timing of the second drive block 112B can be set independently. Therefore, the first drive block 112A and the second drive block 112B can be driven at a drive timing suitable for a large screen.

  Further, both the inspection pad and the start pulse input line may be arranged between the first scan drive circuit 122A and the second scan drive circuit 122B.

  In each of the above embodiments, the peripheral area 120 is provided along the periphery of the display area 110. However, the peripheral area 120 is provided along at least one side of the display area 110 even if it does not surround the display area 110. Just do it.

  In each of the above embodiments, the scanning drive circuit is provided at both ends of each drive block in order to supply the scanning drive signal from both ends of the display area 110. However, the scan drive circuit is provided only at one end of each drive block. It may be provided. When the scanning drive circuit is provided only at one end of each drive block, one inspection pad and one control circuit may be provided accordingly.

  In addition, the transfer direction of the first scanning circuit 122A and the second scanning circuit 122B is not limited. In addition to the above circuit embodiments, for example, the first row of light emitting pixels and the m + 1th row of light emitting pixels are driven simultaneously. The transfer direction may be used.

  Also, for example, the display device according to the present invention is built in a thin flat TV as shown in FIG. By incorporating the display device according to the present invention, a thin flat TV in which circuit elements connected to the scan driving circuit can be arranged at the time of mounting is realized.

  The display device of the present invention is useful in technical fields such as flat-screen televisions and personal computer displays, which require a large screen.

100, 200, 300, 400, 800, 900 Display device 110, 810, 910 Display area 111A, 111B, 801, 911A, 911B, 981 Light emitting pixel 112A, 212A, 912A First drive block 112B, 212B, 912B Second drive Block 120 Peripheral area 121A, 121B, 421, 820 Control circuit 122A, 701, 922A First scan drive circuit 122B, 702, 922B Second scan drive circuit 123A, 123B, 323A, 323B, 423, 850, 923A, 923B For inspection Pad 124A, 124B, 840 Signal line driver circuit 125A, 125B, 225A, 225B, 425, 925A, 925B Scan line 126A, 126B Signal line 131A, 131B, 982 Unit circuit 132 Clock signal Generator 412 third driving block 422 the third scan driving circuit 703 switch unit 830 scanning drive circuit 700 organic light emitting display device 710 scanning driver

Claims (7)

A display device having a display area having a plurality of display pixels arranged in a matrix and a peripheral area provided along at least one side of the display area,
The plurality of display pixels constitute a plurality of drive blocks having a plurality of display pixel rows as one drive block,
The display device
A first scan driving circuit for scanning and driving one drive block;
A second scan driving circuit that scan-drives another drive block adjacent to the one drive block;
A first connection wiring provided for each row of the one drive block;
A second connection wiring provided for each row of the other one drive block;
A circuit element electrically connected to at least one of the first scan drive circuit and the second scan drive circuit,
Each of the first scan drive circuit and the second scan drive circuit includes a plurality of unit circuits connected in a one-to-one correspondence to the corresponding drive block row, and connected in multiple stages.
Each of the plurality of unit circuits is connected to the first or second connection wiring belonging to the same row,
The pitch in the column direction of the plurality of display pixels in the display region, the pitch in the column direction of the plurality of unit circuits included in the first scan drive circuit, and the plurality of units included in the second scan drive circuit. The pitch in the column direction with the circuit is substantially the same,
The first scan drive circuit, the circuit element, and the second scan drive circuit are arranged in this order in a region along the same side of the display region in the peripheral region,
The length of the first connection wiring and the length of the second connection wiring are substantially the same. Each of the plurality of unit circuits included in the first scan driving circuit is arranged with a predetermined amount corresponding to the circuit element in the first direction as viewed from the corresponding display pixel row,
2. Each of the plurality of unit circuits included in the second scan driving circuit is arranged so as to be shifted by the predetermined amount in a second direction opposite to the first direction when viewed from a corresponding display pixel row. The display device described. The at least part of the first connection wiring and at least part of the second connection wiring are non-parallel to the row direction of the plurality of display pixels in the peripheral region. Display device. 4. The display device according to claim 1, wherein the one drive block includes half of the display pixel rows, and the other one drive block includes other half of the display pixel rows. . The display device according to claim 1, wherein the first scan driving circuit and the second scan driving circuit are formed by the same process as the plurality of display pixels. The display device according to claim 1, wherein the circuit element is an inspection pad used when inspecting the first scan driving circuit or the second scan driving circuit. The first and second scan drive circuits supply scan drive signals for driving the one drive block and the other drive block via the first and second connection wirings,
The circuit element inputs a start pulse, which is a signal for controlling the timing for starting the supply of the scan drive signal, to the at least one of the first scan drive circuit and the second scan drive circuit. The display device according to claim 1.

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