JP2004310132A - Driving circuit for a plurality of column electrodes, and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which is easily manufactured while preventing enlargement of its size. <P>SOLUTION: A matrix type display device is provided with a plurality of row electrode driving circuits which respectively drive a plurality of row electrodes and a plurality of column driving circuits which respectively drive a plurality of column electrodes. Each of the column electrode driving circuits is provided with a data input section to which control data signals for column electrodes are inputted, a timing control section which generates timing signals to control operating timing of at least either one of the row electrode driving circuits or the column electrode driving circuits, a selection means which selects either one of the signals synchronized to the timing signals generated by the timing control section or the control data signals inputted to the data input section based on the control data signals inputted to the data input section, and a data output section which outputs the signals selected by the selection means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device such as a liquid crystal display device, and a plurality of column electrode driving circuits used in the display device.

  In a liquid crystal display device, a liquid crystal layer is sandwiched between a pair of glass substrates. FIG. 5 is a plan view showing a schematic configuration of one glass substrate (hereinafter, referred to as a control glass substrate) according to a conventional example. The control glass substrate 21 has a display unit 21a. The display unit 21a is a region where the liquid crystal layer is interposed in the liquid crystal display device. The control glass substrate 21 is provided with a plurality of row electrodes (gate electrodes) 205 parallel to each other and a plurality of column electrodes (source electrodes) 206 orthogonal to each row electrode 205 and mutually parallel to each other. Have been. Note that a common electrode is provided on almost the entire surface of the other glass substrate (hereinafter, referred to as a counter glass substrate) on the surface on the liquid crystal layer side.

  A gate substrate 29 is arranged on one side edge of the control glass substrate 21 along the side edge. Further, the source substrate 25 is arranged along a side edge adjacent to the side edge. On the gate substrate 29, a plurality of row electrode drive circuits (gate driver ICs) 22 for driving the plurality of row electrodes 205, respectively, are arranged in columns along the gate substrate 29. Each row electrode drive circuit 22 It is provided between the gate substrate 29 and the display unit 21a.

  A plurality of column electrode driving circuits (source driver ICs) 23 for respectively driving the plurality of column electrodes 206 are arranged on the source substrate 25 along the source substrate 25. 25 and the display unit 21a.

  A control board 31 is disposed between the gate board 29 and the source board 25, and a timing controller IC 34 is mounted on the control board 31.

  FIG. 6 is a block diagram showing the internal configuration of the timing controller IC 34. The timing controller IC 34 is provided with an input buffer 34a. The input buffer 34a is provided with a control data signal (for example, a display data signal relating to each color of RGB in a color image displayed on the display unit 21a, a clock signal CK, The horizontal synchronizing signal HS, the vertical synchronizing signal VS, the enable signal ENAB, etc.) are input.

  The timing controller IC 34 includes a timing control unit 34b that outputs a column electrode driving / row electrode driving timing signal based on a control data signal input to the input buffer 34a, and a column electrode driving timing output from the timing control unit 34b. It includes a source-side output buffer 34c that outputs a display data signal in synchronization with a signal, and a gate-side output buffer 34d that outputs a row electrode drive timing signal from a timing control unit 34b.

  The timing control unit 34b of the timing controller IC 34 generates a column electrode drive timing signal such as a source start pulse (SSP) and a source clock (SCK) for each column electrode drive circuit 23 based on the control data signal input from the input buffer 34a. Generate The timing control unit 34b transmits the generated column electrode drive timing signals from the output buffer 34c on the source side to the wiring 25a provided on the flexible printed circuit (FPC) 33 and the source substrate 25 as shown in FIG. To the respective column electrode driving circuits 23 on the source substrate 25 via the.

  Similarly, a row electrode drive timing signal generated by the timing control unit 34b of the timing controller IC 34 is used as a scan signal such as a gate start pulse (GSP) and a gate clock (GCK) for each row electrode drive circuit 22 as a scan signal on the gate side. The data is output from the output buffer 34d to each row electrode drive circuit 22 on the gate substrate 29 via the flexible printed circuit (FPC) 32 and the wiring 29a provided on the gate substrate 29.

  The timing controller IC 34 thus generates a column electrode drive / row electrode drive timing signal for driving each row electrode drive circuit 22 and each column electrode drive circuit 23, and outputs a control data signal, a column electrode drive timing signal, , And outputs a display data signal to each column electrode drive circuit 23 in synchronization with the column electrode drive timing signal.

  Each row electrode drive circuit 22 is provided on a side edge of the control glass substrate 21. In this case, the output of the timing controller IC 34 is given to each row electrode drive circuit 22 via the FPC 32 and the wiring on the control glass substrate 21.

  In the liquid crystal display device having such a configuration, each row electrode drive circuit 22 and each column electrode drive circuit 23 are controlled based on a column electrode drive / row electrode drive timing signal generated by the timing controller IC 34 provided on the control board 31. Are respectively driven. Therefore, a large-sized timing controller IC 34 and a control board 31 for mounting the timing controller IC 34 are required.

  In recent years, display devices such as liquid crystal display devices have become larger and have higher definition. Therefore, the bus lines on the control substrate 31 and the source substrate 25 become longer, the additional capacitance of each bus line becomes larger, and the number of column electrode drive circuits 23 connected to one bus line tends to increase. is there. As a result, the fan-out required for each of the output buffers 34c and 34d of the timing controller IC 34 increases, and strict timing settings are required.

  Further, in order to output a column electrode driving / row electrode driving timing signal of the timing controller IC 34 to each row electrode driving circuit 22 and each column electrode driving circuit 23, the control substrate 31, the source substrate 25 and the gate substrate 29 are respectively FPCs 32 and 33 to be connected are required, and a wiring 29a provided on the gate substrate 29 and a wiring 25a provided on the source substrate 25 are also required. affect.

  Furthermore, since the control substrate 31 is connected to the gate substrate 29 and the source substrate 25 using the FPCs 32 and 33, the structure becomes complicated, and the assembling work is not easy, and the manufacturing cost increases. There is also the problem of doing.

  Japanese Patent Application Laid-Open No. 11-194713 discloses that a column electrode driving circuit (source driver) includes a timing generating circuit, and a column electrode driving circuit is provided based on a column electrode driving / row electrode driving timing signal generated by the timing generating circuit. A configuration in which a (source driver) is operated and a row electrode drive circuit (gate driver) is operated is disclosed. In the display device having such a configuration, the structure is simplified and the entire device is prevented from being enlarged.

  For this reason, in a display device provided with a plurality of column electrode drive circuits (source drivers) and a plurality of row electrode drive circuits (gate drivers) as described above, a timing generation circuit is provided in any one of the column electrode drive circuits. It is conceivable to provide a column electrode drive / row electrode drive timing signal generated by this timing generation circuit to each column electrode drive circuit and each row electrode drive circuit.

  FIG. 7 is a plan view of the control glass substrate 21 in which one column electrode driving circuit (source driver IC) 23 includes a timing controller IC 34. However, in this case, the column electrode drive / row electrode drive timing signal generated by the timing controller IC 34 provided in one column electrode drive circuit (source driver IC) 23A is used for the other column electrode drive circuits (source driver IC). A large output buffer is required for one column electrode driving circuit 23A including a timing controller IC 34 in order to output the data to each of the row electrode driving circuits 23 and the respective row electrode driving circuits (gate driver ICs) 22, which is not practical. is there.

  Further, as disclosed in JP-A-11-194713, when the column electrode driving circuit and the row electrode driving circuit are mounted by COG (chip on glass), the column electrode driving circuit and the row electrode driving circuit Since it is not easy to align the driving circuit with the wiring provided on the glass substrate, there is a problem that manufacturing is not easy. In Japanese Patent Application Laid-Open No. H11-194713, wires are arranged on the display unit in order to avoid interference between the wires. In this case, it is necessary to enlarge the frame of the display unit, and the frame is narrowed. I can't.

  The present invention has been made to solve such a problem, and its object is to provide a plurality of row electrode driving circuits and column electrode driving circuits, yet remain small and easy to manufacture. It is to provide a display device. Another object of the present invention is to provide a column electrode driving circuit suitably used for the display device of the present invention.

  A plurality of column electrode driving circuits of the present invention include a matrix type including a plurality of row electrode driving circuits for driving a plurality of row electrodes and a plurality of column electrode driving circuits for driving a plurality of column electrodes, respectively. A plurality of column electrode drive circuits in a display device, wherein each of the plurality of column electrode drive circuits is a data input unit to which a control data signal for a plurality of column electrodes is input, the row electrode drive circuit and the column electrode A timing control unit for generating a timing signal for controlling at least one operation timing of the drive circuit; and a timing signal generated by the timing control unit based on a control data signal input to the data input unit. Signal, or selecting means for selecting one of the control data signal input to the data input unit A data output section for outputting a signal selected by the selection means, wherein a data input section of the first column electrode drive circuit is connected to a data output section of the second column electrode drive circuit; Is connected to the data input unit of the third column electrode drive circuit.

  The data input section of the first column electrode drive circuit has an external data input port to which an external control data signal is input, and a transfer data input port to which a data signal from the second column electrode drive circuit is input. Are provided so as to be switchable with each other, and in response to switching between the external data input port and the transfer data input port, the timing control unit of the first column electrode drive circuit is switched between an operation state and a non-operation state. It may be switchable.

  The data input unit of the first column electrode driving circuit selectively receives one of an external control data signal and a transfer data signal connected to the second column electrode driving circuit, The one timing control unit may be switchable between an operation state and a non-operation state by an external control data signal.

  A display device according to the present invention, comprising: a display panel, a plurality of column electrode driving circuits according to claim 1 provided on the display panel, and a plurality of row electrode driving circuits provided on the display panel. The device, wherein the plurality of column electrode drive circuits are provided from a data output unit of a first column electrode drive circuit disposed close to the plurality of row electrode drive circuits in the plurality of column electrode drive circuits. The plurality of row electrode driving circuits are connected to each other along the first side edge of the display panel so as to cascade transfer the output signal, and the plurality of row electrode driving circuits are adjacent to the first side edge. The first column electrode driving circuit is connected to each other so as to cascade-transfer a scanning signal output from the first column electrode driving circuit along a second side edge of the display panel. External control of circuit data input Data signal, and outputs the control data signal in synchronization with a timing signal generated by a timing control unit of the first column electrode driving circuit, and outputs the control data signal from the first column electrode driving circuit. The plurality of column electrode drive circuits sequentially cascade-transfer control data signals, and a timing signal generated by a timing control unit of the first column electrode drive circuit is applied to each of the plurality of row electrode drive circuits. On the other hand, cascade transfer is sequentially performed as a scanning signal.

  A display device according to the present invention includes a display panel, a plurality of column electrode driving circuits arranged in a row along a first side edge of the display panel, and a plurality of column electrode driving circuits arranged along a second side edge of the display panel. A matrix-type display device having a plurality of row electrode drive circuits arranged in a column, wherein the plurality of row electrode drive circuits are arranged in the vicinity of the plurality of row electrode drive circuits arranged in a column. A control data signal for driving the display panel is input to the first column electrode drive circuit arranged in a manner as described above, and the plurality of row electrode drive circuits are provided in the first column electrode drive circuit. And a timing signal for controlling operation timings of the plurality of column electrode driving circuits is generated, and the generated timing signal is output to an adjacent second column electrode driving circuit together with a data signal, and the output data signal is output. But the second Is transferred to the third column electrode driving circuit adjacent to the column electrode driving circuit, the generated timing signal, for each of said plurality of row electrode drive circuit, it is sequentially cascaded transferred as a scanning signal.

  The display device according to the present invention includes a display panel, a plurality of column electrode driving circuits arranged in a row provided on a printed wiring board arranged along a first side edge of the display panel, and the display device. A plurality of row electrode driving circuits arranged in columns along the second side edge of the panel, wherein each of the plurality of column electrode driving circuits is mounted on a tape carrier package. The first column electrode driving circuit mounted and disposed close to the plurality of row electrode driving circuits among the plurality of column electrode driving circuits includes the plurality of row electrode driving circuits and the plurality of column electrode driving circuits. Generating a timing signal for controlling the operation timing of the circuit, outputting the generated timing signal as a scanning signal to a first row electrode driving circuit disposed in proximity to the first column electrode driving circuit; Said The timing signal output from the first column electrode drive circuit is a first wiring portion provided on a tape carrier package on which the first column electrode drive circuit is mounted, and a second wiring portion provided on the printed wiring board. A wiring section, a third wiring section provided on a tape carrier package on which the first column electrode driving circuit is mounted, and a fourth wiring section provided on the display panel, and One row electrode drive circuit.

  The display device according to the present invention includes a display panel, a plurality of column electrode driving circuits arranged in a row provided on a printed wiring board arranged along a first side edge of the display panel, and the display device. A plurality of row electrode driving circuits arranged in a column along a second side edge of the panel, wherein the timing signal for controlling the plurality of row electrode driving circuits is provided. A second wiring portion provided on the printed wiring board, a third wiring portion provided on one column electrode driving circuit of the plurality of column electrode driving circuits, and a second wiring portion provided on the display panel. The signal is sequentially supplied to one of the plurality of row electrode drive circuits via the fourth wiring unit.

  The display device of the present invention has a small size, is easy to manufacture, and can be manufactured economically despite having a plurality of column electrode drive circuits and row electrode drive circuits. Can be.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 schematically shows a configuration of a liquid crystal display device 100 showing an example of an embodiment of a display device according to the present invention. The liquid crystal display device 100 is an active matrix type TFT array type using thin film transistors (hereinafter, referred to as TFTs) as switching elements, which is advantageous when high display quality is desired.

  As shown in FIG. 1, in the liquid crystal display device 100, a liquid crystal layer 109 is provided between a counter glass substrate 102 and a control glass substrate 11, and the liquid crystal layer 109 controls the common electrode 104 on the counter glass substrate 102. It is controlled by the plurality of pixel electrodes 103 on the glass substrate 11. In the control glass substrate 11, each of the plurality of pixel electrodes 103 is connected to a source electrode 106 via a switching element (TFT) 108, and a gate of the TFT 108 is connected to a gate electrode 105, respectively.

  The liquid crystal display device 100 has a configuration in which a liquid crystal layer 109 is interposed between a control glass substrate 11 and a counter glass substrate 102.

  The control glass substrate 11 is divided into a display section 11a and a non-display section 10a.

  The display section 11a includes a gate electrode 105, a source electrode 106, a TFT 108, and a pixel electrode 103.

  A plurality of row electrode drive circuits 12 are provided in the non-display section 10a. A printed wiring board 15 for column electrodes is arranged along a side edge of the control glass substrate 11. A plurality of column electrode drive circuits 13 and a TCP (Tape Carrier Package: Tape Carrier Package) 14 on which each column electrode drive circuit 13 is mounted, over the side edge portions of the column electrode printed wiring board 15 and the control glass substrate 11. Are provided. In the present embodiment, display panel 20 includes control glass substrate 11 and opposing glass substrate 102.

  FIG. 2 is a schematic configuration diagram of the control glass substrate 11 and the printed wiring board 15 for column electrodes, and FIG. 3A is a schematic configuration diagram showing an enlarged main part thereof.

  The display section 11a included in the control glass substrate 11 is an area where the liquid crystal layer 109 (see FIG. 1) is interposed in the liquid crystal display device 100. In the pixel electrode 103 (see FIG. 1) of the display section 11a, each of RGB colors is converted into a color based on digital data of each of R (red), G (green), and B (blue) input by 6 bits. , 64 gradations. In the present embodiment, the display unit 11a is configured by a portion of the control glass substrate 11 excluding a pair of adjacent side edges.

  The display unit 11a of the control glass substrate 11 is provided with a plurality of row electrodes 105 that are parallel to each other and a plurality of column electrodes 106 that intersect orthogonally with each row electrode 105 and are parallel to each other. .

  A scanning signal for selecting each row electrode 105 is applied to each row electrode 105, and a display data signal for realizing gradation display according to each display data is applied to each column electrode 106. Applied. The common glass 104 (see FIG. 1) is provided on almost the entire surface of the counter glass substrate 102 on the surface on the liquid crystal layer 109 side.

  A plurality of row electrode drive circuits (gate driver ICs) 12 for driving the plurality of row electrodes 105 are provided on one side edge of the control glass substrate 11 located around the display section 11a along the side edge. Are arranged in rows.

  A column electrode printed wiring board 15 is arranged along a side edge adjacent to a side edge of the control glass substrate 11 on which each row electrode drive circuit 12 is arranged. , A plurality of column electrode driving circuits (source driver ICs) 13 are provided. Each of the column electrode driving circuits 13 is mounted on a TCP 14, and each of the TCPs 14 is provided between the side edge of the control glass substrate 11 and the printed wiring board 15 for a column electrode. Are arranged along the side edges.

  Adjacent column electrode drive circuits 13 mounted on the TCP 14 are connected to each other by a crossover wiring 36.

  Although each row electrode drive circuit 12 is mounted on the control glass substrate 11, each row electrode drive circuit 12 is mounted similarly to the TCP 14 on which the column electrode printed wiring board 15 and each column electrode drive circuit 13 are mounted. You may comprise so that it may mount on TCP and provide it on a printed wiring board.

  FIG. 4A is a block diagram illustrating an internal configuration of the column electrode drive circuit 13.

  The column electrode drive circuit 13 mounted on each TCP 14 may have the same configuration. The column electrode drive circuit 13 is provided with a data input section 13a to which a control data signal is input. The column electrode drive circuit 13 is further provided with a timing control unit 13b that generates a column electrode drive / row electrode drive timing signal based on a control data signal input to the data input unit 13a. The output of the data input unit 13a and the output of the timing control unit 13b are provided to the data output unit 13d via the selector 13c.

  The data input section 13a of the column electrode drive circuit 13 is connected to an external data input port 13e to which a control data signal input from the outside is input, and to a column electrode drive circuit of a preceding stage when the column electrode drive circuits 13 are connected to each other. A transfer data input port 13f to which a control data signal output from the circuit 13 is input. The input control data signals are a display data signal of each color of RGB, a clock signal CK, a horizontal synchronization signal HS, a vertical synchronization signal VS, and an enable signal ENAB.

  Only one of the external data input port 13e and the transfer data input port 13f of the data input unit 13a is selected and used.

  Further, the timing control unit 13b can switch between an operation state in which a column electrode drive / row electrode drive timing signal is generated and a non-operation state in which a column electrode drive / row electrode drive timing signal is not generated. When a control data signal is input from the external data input port 13e of the data input unit 13a, the timing control unit 13b is set to an operation state of generating a column electrode drive / row electrode drive timing signal. On the other hand, when a control data signal is input from the transfer data input port 13f of the data input unit 13a, the timing control unit 13b enters a non-operating state in which a column electrode drive / row electrode drive timing signal is not generated.

  In the column electrode drive circuit 13 having such a configuration, one column electrode drive circuit (hereinafter, referred to as a master column electrode drive circuit 13M) close to the row electrode drive circuit 12 receives an external control data signal from an external data input. When input from the port 13e, the timing control unit 13b enters an operation state of generating a column electrode drive / row electrode drive timing signal. An external data input port 13e of the master column electrode drive circuit 13M receives a control data signal from the display device or the outside of the column electrode drive circuit 13.

  The transfer data input port 13f is selected for each of the column electrode driving circuits other than the master column electrode driving circuit 13M (hereinafter, referred to as a slave column electrode driving circuit 13S). Therefore, the timing control unit 13b of each slave column electrode drive circuit 13S is in a non-operating state in which a column electrode drive / row electrode drive timing signal is not generated. In the slave column electrode drive circuit 13S connected to the master column electrode drive circuit 13M, the control data signal output from the master column electrode drive circuit 13M is input from the transfer data input port 13f. In other slave column electrode circuits 13S, the control data signal transferred from each slave column electrode drive circuit 13S connected to the preceding stage is input from the transfer data input port 13f.

  In the master column electrode drive circuit 13M, a control data signal input from the external data input port 13e to the data input unit 13a is given to the timing control unit 13b, and a column generated by the timing control unit 13b in the operating state is provided. The electrode drive / row electrode drive timing signal and the data signal are given to the selector 13c. The selector 13c outputs the column electrode drive / row electrode drive timing signal and the data signal generated by the timing control unit 13b to the data output unit 13d.

  The data output unit 13d is connected to a control data signal (composed of timing signals SCK, SSP, LS, DATA signal, and RGB × 6 bits) synchronized with the column electrode drive / row electrode drive timing signal by the crossover wiring 36. The master column electrode driving circuit outputs the signal to the slave column electrode driving circuit 13S and uses the row electrode driving timing signal generated by the timing control section 13b as a scanning signal such as a gate start pulse (GSP) and a gate clock (GCK). The signal is output to the row electrode drive circuit 12 arranged in the vicinity of 13M.

  Note that each column electrode 106 connected to the master column electrode drive circuit 13M is controlled based on the control data signal.

  In each slave column electrode driving circuit 13S, a control data signal output from the preceding column electrode driving circuit 13 is input to the data input section 13a via the transfer data input port 13f, and the control data signal is supplied to the selector 13a. 13c. In each slave column electrode drive circuit 13S, the timing control section 13b is in a non-operating state in which no column electrode drive / row electrode drive timing signal is generated, and the selector 13c outputs a control data signal supplied from the data input section 13a. The data output unit 13d outputs the control data signal to the serially connected slave column electrode drive circuit 13S via the crossover wiring 36.

  As described above, each slave column electrode drive circuit 13S sequentially cascades control data signals transferred from the preceding master column electrode drive circuit 13M or the slave column electrode drive circuit 13S to the subsequent slave column electrode drive circuit 13S. Forward.

  In each slave column electrode drive circuit 13S, each column electrode connected to each slave column electrode drive circuit 13S is controlled based on the control data signal.

  FIG. 4B shows another example of the column electrode drive circuit 13. In the column electrode driving circuit 13, a data input port 13g is provided with one data input port 13g, and an external control data signal is output to the data input port 13g from the preceding column electrode driving circuit 13. One of the transfer data signals is selectively input. The timing control section 13b of the column electrode drive circuit 13 can be switched between an operation state and a non-operation state by an external control data signal. The timing control section 13b includes an operation state for generating a column electrode drive / row electrode drive timing signal based on an external control signal given to a control terminal 13h provided in the timing control section 13b, Switching to a non-operation state in which a row electrode drive timing signal is not generated.

  In the column electrode drive circuit 13 having such a configuration, an external control data signal is input to the data input port 13g of the master column electrode drive circuit 13M disposed close to the row electrode drive circuit 12, and the control data signal is input to the data input port 13g. A state in which the timing control unit 13b generates a column electrode drive / row electrode drive timing signal based on a control signal input from the control terminal 13h is set as an operation state. At this time, the selector 13c outputs the control data signal input from the data input unit 13a to the data output unit 13d in synchronization with the column electrode drive / row electrode drive timing signal generated by the timing control unit 13b. , And outputs the column electrode drive / row electrode drive timing signal itself generated by the timing controller 13b.

  In the slave column electrode drive circuit 13S, a control data signal is input as a transfer data signal to the data input port 13g from the master column electrode drive circuit 13M or the slave column electrode drive circuit 13S in the preceding stage, respectively. Each of the timing control units 13b is in a non-operating state in which a column electrode drive / row electrode drive timing signal is not generated by a control signal input from the control terminal 13h. The selector 13c outputs the control data signal input from the data input unit 13a to the data output unit 13d as it is, and the data output unit 13d outputs the control data signal.

  The crossover wiring 36 used to cascade transfer the control data signal from the master column electrode drive circuit 13M or each slave column electrode drive circuit 13S to another slave column electrode drive circuit 13S is provided on the column electrode printed wiring board 15. , On the side edge of the display panel 11.

  The scanning signal output from the master column electrode driving circuit 13M is output to the row electrode driving circuit 12 arranged close to the master column electrode driving circuit 13M by the scanning signal wiring 18, as shown in FIG. 3A. The scanning signal wiring 18 is provided so as not to intersect with the common signal wiring 17 connected to the common electrode 104 provided on the opposite glass substrate 102. Here, the common signal wiring 17 is shown overlaid on FIG. 3A for comparison. The common signal wiring 17 is linearly provided from the column electrode printed wiring board 15 so as to traverse the TCP 14 on which the master column electrode drive circuit 13M is mounted, so that the end is located on the control glass substrate 11. At the connection point 16 located at the corner of the display section 11 a on the control glass substrate 11, it is connected to the common electrode 104 of the opposing glass substrate 102.

  The scanning signal wiring 18 is provided with a first wiring portion 18a disposed on the TCP 14 in parallel with the common signal wiring 17 so as not to intersect with the common signal wiring 17, and a column electrode print is formed continuously with the first wiring portion 18a. A second wiring portion 18b disposed on the wiring board 15 so as to surround the common wiring portion 17; and a third wiring portion 18c disposed on the TCP 14 so as to traverse the TCP 14 continuously to the second wiring portion 18b. And a fourth wiring portion 18d disposed on the control glass substrate 11 of the display panel 20 continuously to the third wiring portion 18c, and the scanning signal output from the master column electrode driving circuit 13M is The scanning signal wiring 18 is sequentially supplied to the row electrode driving circuit 12 disposed close to the master column electrode driving circuit 13M via the first to fourth wiring portions 18a to 18d. . Then, the scanning signals given to the row electrode drive circuits 12 are sequentially cascaded to the adjacent row electrode drive circuits 12.

  In this embodiment, the gate substrate is not provided, but the row electrode drive circuit 12 may be provided using the gate substrate. In that case, the function of each row electrode drive circuit 12 is the same.

  In the liquid crystal display device having such a configuration, the RGB data signals, the clock signal CK, the horizontal synchronization signal HS, the vertical synchronization signal VS, and the control data signals such as the enable signal ENAB input to the master column electrode drive circuit 13M are used. Based on this, each column electrode 106 connected to the master column electrode drive circuit 13M is controlled.

  In the master column electrode driving circuit 13M, the input control data signal is synchronized with a column electrode driving timing signal generated by the timing control section 13b provided in the master column electrode driving circuit 13M, and the master column electrode driving circuit is driven. The signal is transferred to the slave column electrode drive circuit 13S adjacent to the circuit 13M. Then, each column electrode 106 connected to the slave column electrode drive circuit 13S is controlled based on the transferred control data signal. The control data signal input to the slave column electrode drive circuit 13S is transferred to the adjacent slave column electrode drive circuit 13S in synchronization with the timing at which the next control data signal is input.

  Hereinafter, by repeating the same operation, the control data signal is sequentially cascaded to each slave column electrode driving circuit 13S, and based on the control data signal transferred to each slave column electrode driving circuit 13S. Each column electrode 106 connected to each slave column electrode drive circuit 13S is controlled.

  The master column electrode drive circuit 13M transmits a row electrode drive timing signal generated from the internal timing control section 13b to a row electrode drive circuit 12 disposed adjacent to the master column electrode drive circuit 13M, by signal wiring. The signal is output as a scanning signal of GSP, GCK, etc., via. The row electrode drive circuit 12 controls each row electrode 105 connected to the row electrode drive circuit 12 based on the transferred scanning signal. The scanning signal input to the row electrode driving circuit 12 is transferred to the adjacent row electrode driving circuit 12 in synchronization with the next input scanning signal.

  Hereinafter, by repeating the same operation, the scan signal is sequentially cascade-transferred to each row electrode drive circuit 12, and each row electrode 105 connected to each row electrode drive circuit 12 is based on the transferred scan signal. And each is driven.

  As described above, according to the present invention, since the timing signal generation circuit 13b for generating the column electrode drive / row electrode drive timing signal is provided in the master column electrode drive circuit 13M, the column electrode drive / row electrode drive A timing controller IC for generating a timing signal, a control board for mounting the timing controller IC, and the like are not required. Therefore, an FPC for electrically connecting the timing controller IC to the column electrode printed wiring board or the like is not required. As a result, the entire liquid crystal display device can be reduced in size, and operations such as assembly can be facilitated, and the liquid crystal display device can be easily manufactured.

  In addition, since the control data signal for each slave column electrode drive circuit 13S is transferred from the adjacent master column electrode drive circuit 13M or slave column electrode drive circuit 13S, the data output unit 13d provided in each column electrode drive circuit 13S Need only have the ability to transfer control data signals via the short transition wires 36, and the column electrode drive circuit 13 can be reduced in size.

  Since the scanning signal for each row electrode drive circuit 12 is also transferred from the adjacent row electrode drive circuit 12, the wiring for signal transmission to each row electrode drive circuit 12 can be shortened. Can also be miniaturized.

  Further, in the above embodiment, the master column electrode drive circuit 13M and the slave column electrode drive circuit 13S have the same configuration, and the functions of the master and the slave can be changed by an external operation. Therefore, the column electrode drive circuit 13 can be mounted on the column electrode printed wiring board 15 irrespective of the functions of the master and the slave. Therefore, each column electrode drive circuit 13 can be efficiently mounted using a conventionally used column electrode drive circuit mounting device.

  Each column electrode drive circuit 13 is provided on a column electrode printed wiring board 15 while being mounted on the TCP 14. Therefore, the scanning signal wiring 18 for supplying a scanning signal from the master column electrode driving circuit 13M to the row electrode driving circuit 12 is formed on the TCP 14 and the column electrode printed wiring board 15 so as not to cross the common signal wiring 17. Can be easily formed. Note that when the column electrode driving circuit is formed on a glass substrate by COG (chip on glass), there is no flexibility in providing the scanning signal wiring, and the wiring provided on the glass substrate and the column electrode driving circuit are not provided. Is not easy to connect.

  In the above description, a liquid crystal display device is described as a specific example of the display device, but the display device to which the present invention can be applied is not limited to the liquid crystal display device.

  FIG. 3B is an enlarged view of a main part of a liquid crystal display device according to another embodiment of the present invention. As shown in FIG. 3B, a timing signal for controlling the row electrode drive circuit 12 is generated by another part (for example, a timing signal generation circuit 19 formed of a dedicated IC) and is provided on the column electrode printed wiring board 15. The second wiring portion 19b provided, the third wiring portion 19c provided on one column electrode drive circuit 13 of the plurality of column electrode drive circuits, and the control portion 10 provided on the control glass substrate 11 of the display panel 20. One of the plurality of row electrode drive circuits may be provided to one of the row electrode drive circuits 12 sequentially via the fourth wiring unit 19d.

  According to the above configuration, a timing signal can be supplied to the row electrode drive circuit 12 without using a row electrode printed wiring board. Therefore, the configuration is simplified, and the size, cost, and productivity can be improved. To play.

  Furthermore, the timing generation circuit 19 does not necessarily need to be in the column electrode drive circuit 13 and may be on the column electrode printed wiring board 15 or may be outside the wiring board. For example, a timing signal function may be provided in an external dedicated LSI as a part of the logic circuit. As a result, restrictions on the location of the timing signal generation circuit are reduced, and the degree of geographical freedom is improved.

FIG. 1 is a diagram schematically illustrating a configuration of a liquid crystal display device according to the present invention. FIG. 1 is a schematic configuration diagram of a main part of a liquid crystal display device according to the present invention. FIG. 2 is an enlarged view of a main part of the liquid crystal display device according to the present invention. FIG. 11 is an enlarged view of a main part of a liquid crystal display device according to another embodiment of the present invention. (A) is a block diagram showing an example of a configuration of a column electrode driving circuit used in the liquid crystal display device, and (b) is a block diagram showing another example of a configuration of the column electrode driving circuit. It is a schematic structure figure showing an example of the conventional liquid crystal display. FIG. 2 is a block diagram illustrating a configuration of a timing controller IC used in the liquid crystal display device. FIG. 11 is a schematic configuration diagram illustrating another example of a conventional liquid crystal display device.

Explanation of reference numerals

11 control glass substrate 11a display unit 12 row electrode drive circuit (gate driver IC)
13 Column electrode drive circuit (source driver IC)
14 TCP
15 Printed wiring board for column electrode 16 Wiring 17 Common signal wiring 18 Scanning signal wiring

Claims (2)

A display panel;
A plurality of column electrode driving circuits arranged in a column provided on a printed wiring board arranged along a first side edge of the display panel;
A plurality of row electrode drive circuits arranged in a column along a second side edge of the display panel;
A matrix type display device having
Each of the plurality of column electrode drive circuits is mounted on a tape carrier package,
Among the plurality of column electrode drive circuits, a first column electrode drive circuit disposed close to the plurality of row electrode drive circuits is configured to operate the plurality of row electrode drive circuits and the plurality of column electrode drive circuits. Generating a timing signal for controlling timing, outputting the generated timing signal as a scanning signal to a first row electrode driving circuit disposed in proximity to the first column electrode driving circuit,
The timing signal output from the first column electrode driving circuit is provided on a first wiring unit provided on a tape carrier package on which the first column electrode driving circuit is mounted, and on the printed wiring board. A second wiring portion, a third wiring portion provided on a tape carrier package on which the first column electrode driving circuit is mounted, and a fourth wiring portion provided on the display panel sequentially passing through the second wiring portion. A display device provided to the first row electrode drive circuit. A display panel;
A plurality of column electrode driving circuits arranged in a column provided on a printed wiring board arranged along a first side edge of the display panel;
A plurality of row electrode drive circuits arranged in a column along a second side edge of the display panel;
A matrix type display device having
A timing signal for controlling the plurality of row electrode drive circuits is provided on a second wiring unit provided on the printed wiring board and on one column electrode drive circuit of the plurality of column electrode drive circuits. A display device provided to one of the plurality of row electrode drive circuits via a third wiring section and a fourth wiring section provided on the display panel sequentially.

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