JP2012173598A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately prevent occurrence of component destruction due to connection defects among a liquid crystal panel, a driving substrate, a control substrate, a first wiring member for connecting the control substrate and the driving substrate, and a second wiring member for connecting the driving substrate and the liquid crystal panel.SOLUTION: A control substrate 12 includes FFCs 15a, 15b, 16a 16b, 18, 19, source substrates 13a to 13d, gate substrates 14a, 14b, source side SOFs 17a to 17h, gate side SOFs 20a to 20d, and input/output terminals 27, 28, 31 for detecting a connection state of a liquid crystal panel 11. The FFCs 15a, 15b, 16a 16b, 18, 19, the source substrates 13a to 13d, the gate substrates 14a, 14b, the source side SOFs 17a to 17h, the gate side SOFs 20a to 20d, and the liquid crystal panel 11 have wirings for detecting a connection state, respectively, and the respective wirings are connected to the input/output terminals 27, 28, 31 for detecting a connection state of the control substrate 12 when these components are assembled.

Description

  The present invention relates to a liquid crystal panel, at least one drive board for driving the liquid crystal panel, a control board for supplying power to the liquid crystal panel and outputting a signal for driving the liquid crystal panel, and the control board and the drive The present invention relates to a liquid crystal display device that includes a first wiring member that connects a circuit board and a second wiring member that connects a driving substrate and a liquid crystal panel.

  In recent years, with the dramatic increase in the number of LCD TVs produced, it is desired to develop a technique for more efficiently manufacturing and inspecting LCD TVs. Such techniques include a technique for sharing parts used in a liquid crystal television and a technique for quickly identifying a defective part.

  For example, Patent Document 1 discloses a liquid crystal driving device including a liquid crystal module including a source circuit, a gate circuit, and a liquid crystal panel, and a driving circuit that generates and outputs image data. In this liquid crystal driving device, the gradation determining circuit that differs depending on the characteristics of the liquid crystal panel is formed in at least one of the source circuit and the gate circuit, and is not formed in the driving circuit. As a result, the drive circuit does not depend on the characteristics of the liquid crystal panel, so that the drive circuit can be shared between liquid crystal panels having different characteristics.

  Patent Document 2 discloses a liquid crystal display device in which a source driving circuit unit having a source driver for driving a source line of a liquid crystal panel is divided into a plurality of source driving circuit elements. The source distribution printed circuit board of each source drive circuit element has the same configuration including only one input connector to which the source transmission flexible board is connected. As a result, the common source distribution printed circuit board can be achieved.

  Further, Patent Document 3 discloses a chip mounting substrate that includes a display panel having display electrodes and a driving circuit for driving the display electrodes, and the display electrodes and driving circuit of the display panel include wiring cables. A method for testing a flat display device connected via a cable is disclosed. In this test method, after detecting the lighting failure of the display panel, all the electrode terminals on the opposite side of the electrode terminal connecting the chip mounting substrate to the display panel are short-circuited, and the electrical characteristics of the shorted electrode terminals are measured. Thus, the defect of the chip mounting substrate is detected. Thereby, the location with a defect is specified, without removing the chip mounting substrate which is the cause of lighting failure.

  Patent Document 4 discloses a circuit board inspection apparatus that inspects whether or not an output terminal of an integrated circuit and a land formed on the circuit board are electrically joined to each other on a circuit board on which the integrated circuit is mounted. It is disclosed. In this circuit board inspection apparatus, a control signal is generated such that two response signals having different frequencies are output from one of a large number of output terminals corresponding to each output wiring group. Then, by independently detecting the two response signals generated by the control signal, whether or not the two output terminals from which the response signals are output and the lands corresponding to the two output terminals are electrically joined to each other are determined. Are detected simultaneously.

JP 2008-292575 A JP 2009-20228 A JP-A-11-65476 JP 2007-187510 A

  However, the prior art disclosed in the above-mentioned patent documents drives a control substrate on which a power source for supplying power to the liquid crystal panel is mounted, a source substrate having a circuit for driving the source line of the liquid crystal panel, and a gate line of the liquid crystal panel. It is not inspected whether or not there is a connection failure in all of the wiring members such as the gate substrate, the liquid crystal panel, and the FFC (Flexible Flat Cable) and SOF (System On Film). If power is supplied to the liquid crystal panel when there is a connection failure, the liquid crystal panel may not operate properly, and components such as a source substrate and a gate substrate may be destroyed.

  In particular, as the image quality of a liquid crystal display device becomes higher, the interval between electrodes for applying a voltage to the liquid crystal is also shortened. Therefore, it has become difficult to connect an electrode that applies a voltage to the liquid crystal and a circuit that drives the electrode. Also, since there are many signal lines on the control board, source board, gate board, liquid crystal panel, and wiring member, poor connection when connecting signal lines via connectors or connecting signal lines by crimping, etc. Is likely to occur.

  In view of the above problems, the present invention provides a liquid crystal panel, at least one drive substrate for driving the liquid crystal panel, a control substrate for supplying power to the liquid crystal panel and outputting a signal for driving the liquid crystal panel, and a control substrate And a first wiring member that connects the driving substrate and a second wiring member that connects the driving substrate and the liquid crystal panel. The purpose is to provide.

  In order to solve the above-described problems, a first technical means of the present invention includes a liquid crystal panel, at least one driving substrate for driving the liquid crystal panel, and supplying power to the liquid crystal panel, and the liquid crystal panel A control board that outputs a signal for driving the control board, a first wiring member that connects the control board and the driving board, and a second wiring member that connects the driving board and the liquid crystal panel. The control board includes the first wiring board, the driving board, the second wiring member, and an input / output terminal for detecting a connection state of the liquid crystal panel, The first wiring board, the driving board, the second wiring member, and the liquid crystal panel each have a wiring for detecting a connection state, and the control board, the first wiring member, and the driving Substrate for the second When the wiring member and the liquid crystal panel are combined, the wiring for detecting the connection state of each of the first wiring member, the driving substrate, the second wiring member, and the liquid crystal panel is It is connected to the input / output terminal for detecting the connection state of the control board.

  According to a second technical means of the present invention, when the control board, the first wiring member, the driving board, the second wiring member, and the liquid crystal panel are combined in the first technical means. The first wiring member, the driving board, the second wiring member, and the connection state detection wiring of the liquid crystal panel are connected to the connection state detection input / output terminal of the control board. It is characterized by being connected in series.

  According to a third technical means of the present invention, in the first or second technical means, the first wiring board is a flat member, and the connection point where the first wiring path is connected to the control board. The connection state detection wiring is provided at both end portions of the first and second connection portions where the first wiring path is connected to the driving substrate.

  According to a fourth technical means of the present invention, in any one of the first to third technical means, the second wiring board is a flat member, and the second wiring path is connected to the driving board. The connection state detection wiring is provided at both ends of the connection location to be connected and at both ends of the connection location where the second wiring path is connected to the liquid crystal panel.

  According to a fifth technical means of the present invention, in any one of the first to fourth technical means, the driving substrate is a source substrate including a circuit for driving a source line of the liquid crystal panel. To do.

  According to a sixth technical means of the present invention, in the fifth technical means, the driving substrate includes at least two source substrates, and further includes a third wiring member for connecting the source substrates. The wiring board has wiring for detecting a connection state, the control board, the first wiring member, the two or more source boards, the third wiring board, the second wiring member, and the liquid crystal panel Are combined, the first wiring member, the two or more source substrates, the third wiring substrate, the second wiring member, and the wiring for detecting the connection state of each of the liquid crystal panels are provided. The control board is connected to the input / output terminal for detecting the connection state.

  According to a seventh technical means of the present invention, in the sixth technical means, the third wiring board is a flat member, and both end portions of connection points where the third wiring path is connected to the source board. The above-mentioned connection state detection wiring is provided.

  According to an eighth technical means of the present invention, in any one of the first to fourth technical means, the driving substrate is a gate substrate including a circuit for driving a gate line of the liquid crystal panel. To do.

  According to a ninth technical means of the present invention, in the eighth technical means, the driving substrate comprises at least two or more gate substrates, further comprising a fourth wiring member for connecting the gate substrates, The wiring board has wiring for detecting a connection state, the control board, the first wiring member, the two or more gate substrates, the fourth wiring board, the second wiring member, and the liquid crystal panel Are combined, the first wiring member, the two or more gate substrates, the fourth wiring substrate, the second wiring member, and the wiring for detecting the connection state of each of the liquid crystal panels are provided. The control board is connected to the input / output terminal for detecting the connection state.

  According to a tenth technical means of the present invention, in the ninth technical means, the fourth wiring board is a flat member, and both end portions of connection points where the fourth wiring path is connected to the gate substrate. The above-mentioned connection state detection wiring is provided.

  According to an eleventh technical means of the present invention, in any one of the first to fourth technical means, at least one of the driving substrates is a source substrate including a circuit for driving a source line of the liquid crystal panel. And at least one of the driving substrates is a gate substrate having a circuit for driving a gate line of the liquid crystal panel, and further includes a fifth wiring member for connecting the source substrate and the gate substrate, The wiring board has wiring for detecting a connection state, the control board, the first wiring member, the source board, the fifth wiring board, the gate board, the second wiring member, and the When the liquid crystal panel is combined, each connection state of the first wiring member, the source substrate, the fifth wiring substrate, the gate substrate, the second wiring member, and the liquid crystal panel Wiring for detection, characterized in that it is connected to the input and output terminals for the connection status detection of the control board.

  A twelfth technical means of the present invention is the eleventh technical means according to the eleventh technical means, wherein the fifth wiring board is a flat member, and both end portions of connection points where the fifth wiring path is connected to the source board In addition, the connection state detection wiring is provided at both ends of a connection portion where the fifth wiring path is connected to the gate substrate.

  According to a thirteenth technical means of the present invention, in any one of the first to twelfth technical means, the first signal is output to the connection state detection output terminal, and the connection state detection input A connection detection unit that detects a signal input from a terminal; and a power supply control unit that controls power supply to the liquid crystal panel based on a detection result detected by the connection detection unit. To do.

  According to a fourteenth technical means of the present invention, in the thirteenth technical means, the connection detection unit is inputted from the connection state detection input terminals provided in at least two locations of the connection state detection wiring. A signal is detected, a location where a connection failure occurs is determined based on the detection result of the signal, and information on the determined location is output.

  According to a fifteenth technical means of the present invention, in the thirteenth or fourteenth technical means, the connection detector further outputs the first signal to the output terminal for detecting the connection state, and then the connection. A second signal having a voltage level lower than the voltage level of the first signal is output to a state detection output terminal.

  According to the present invention, the control board has the first wiring board, the driving board, the second wiring member, and the input / output terminal for detecting the connection state of the liquid crystal panel, and the first wiring board, the driving board. The circuit board, the second wiring member, and the liquid crystal panel each have wiring for detecting a connection state, and the control board, the first wiring member, the driving board, the second wiring member, and the liquid crystal panel are When combined, the wiring for detecting the connection state of each of the first wiring member, the driving substrate, the second wiring member, and the liquid crystal panel is connected to the input / output terminal for detecting the connection state of the control board. Therefore, it can be easily confirmed that the control board, the first wiring board, the driving board, the second wiring member, and the liquid crystal panel are properly connected to each other by connectors or crimped. , Control board, first wiring board, drive Use substrate, a second wiring member, and the occurrence of poor connection attributable to parts breakdown between the liquid crystal panel can be prevented appropriately.

It is a figure which shows an example of the liquid crystal display device which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating an example of a liquid crystal display device 10 according to an embodiment of the present invention. As shown in FIG. 1, the liquid crystal display device 10 includes a liquid crystal panel 11, a control substrate 12, source substrates 13a to 13d, gate substrates 14a and 14b, flexible flat cables (FFCs) 15a, 15b, 16a, 16b, 18, 19, source-side SOF (System On Film) 17a to 17h and gate-side SOF (System On Film) 20a to 20d. Here, the FFCs 15a and 15b correspond to the first wiring member in the present invention. The source side SOFs 17a to 17d, the source side SOFs 17e to 17h, and the gate side SOFs 20a to 20d correspond to the second wiring member in the present invention. The FFC 16a corresponds to the third wiring member in the present invention. The FFC 19 corresponds to the fourth wiring member in the present invention. The FFC 18 corresponds to the fifth wiring member in the present invention.

  The liquid crystal panel 11 is a display device that displays characters, figures, and the like by applying voltage to the source lines and gate lines to change the alignment state of the liquid crystals. The control board 12 is a control board that outputs a signal for driving the liquid crystal panel 11. The control board 12 includes a power supply unit 21 and a control unit 22. The power supply unit 21 is a power source that supplies power to the liquid crystal panel 11. The power supply unit 21 supplies power to the liquid crystal panel 11 through the power line 25, the source side SOFs 17a to 17h, and the gate side SOFs 20a to 20d. The control unit 22 is a control device that controls power supply to the liquid crystal panel 11. The control part 22 is comprised by IC (Integrated Circuit), such as FPGA (Field-Programmable Gate Array), for example. The control unit 22 includes a connection detection unit 23 and a power supply control unit 24.

  The connection detector 23 detects whether or not the liquid crystal panel 11, the control board 12, the source boards 13a and 13b, the FFCs 15a and 16a, and the source side SOFs 17a to 17d are electrically connected to each other, and the liquid crystal panel 11 Whether the control substrate 12, the source substrates 13c and 13d, the gate substrates 14a and 14b, the FFCs 15b and 16b, 18 and 19, the source side SOFs 17e to 17h, and the gate side SOFs 20a to 20d are electrically connected to each other. A processing unit to detect.

  Here, the liquid crystal display device 10 is provided with a first wiring path 26 and a second wiring path 29 for detecting whether or not each of the above components is properly connected. In the first wiring path 26, when the liquid crystal panel 11, the control board 12, the FFCs 15a and 16a, the source boards 13a and 13b, and the source side SOFs 17a to 17d are combined, wirings provided in the respective components are connected in series. This is a wiring path that can be drawn with a single stroke.

  Specifically, the first wiring path 26 is connected from the first terminal 27 provided on the control board 12 to the FFC 15a, the source board 13a, the FFC 16a, the source board 13b, the source side SOF 17a, the liquid crystal panel 11, and the source side SOF 17a. , Source substrate 13b, source side SOF 17b, liquid crystal panel 11, source side SOF 17b, source substrate 13b, FFC 16a, source substrate 13a, source side SOF 17c, liquid crystal panel 11, source side SOF 17c, source substrate 13a, source side SOF 17d, liquid crystal panel 11 , A wiring path that reaches the second terminal 28 of the control board 12 through the source side SOF 17d, the source board 13a, and the FFC 15a in order.

  The second wiring path 29 is a combination of the liquid crystal panel 11, the control substrate 12, the FFCs 15b, 16b, 18, 19, the source substrates 13c and 13d, the source side SOFs 17e to 17h, the gate substrates 14a and 14b, and the gate side SOFs 20a to 20d. In this case, a wiring path that can be written with a single stroke is formed by connecting the wirings provided in each component in series.

  Specifically, the second wiring path 29 is connected to the FFC 15b, the source substrate 13c, the source side SOF 17e, the liquid crystal panel 11, the source side SOF 17e, the source substrate 13c, and the source from the third terminal 30 provided on the control board 12. Side SOF 17f, liquid crystal panel 11, source side SOF 17f, source substrate 13c, FFC 16b, source substrate 13d, source side SOF 17g, liquid crystal panel 11, source side SOF 17g, source substrate 13d, source side SOF 17h, liquid crystal panel 11, source side SOF 17h, source Substrate 13d, FFC 18, gate substrate 14a, gate side SOF 20a, liquid crystal panel 11, gate side SOF 20a, gate substrate 14a, gate side SOF 20b, liquid crystal panel 11, gate side SOF 20b, gate substrate 14a, FFC 19, gate substrate 14 , Gate side SOF 20c, liquid crystal panel 11, gate side SOF 20c, gate substrate 14b, gate side SOF 20d, liquid crystal panel 11, gate side SOF 20d, gate substrate 14b, FFC 19, gate substrate 14a, FFC 18, source substrate 13d, FFC 16b, source substrate 13c , A wiring path that reaches the fourth terminal 31 of the control board 12 via the FFC 15b in sequence.

  Here, in the example of FIG. 1, the third terminal 30 is electrically connected to the second terminal 28 on the control board 12. That is, the second wiring path 29 branches off from the first wiring path 26 on the control board 12. Thereby, as described below, the continuity of the first wiring path 26 and the second wiring path 29 is determined using the input signals obtained from the second terminal 28 and the fourth terminal 31. In this case, it is only necessary to output a signal to the first terminal 27, and the circuit configuration can be simplified.

  The connection detection unit 23 outputs a first voltage level (High level) signal to the first terminal 27, a signal input from the second terminal 28, and a signal input from the fourth terminal 31. Is detected. Then, the connection detection unit 23 matches the voltage level of the signal input from the second terminal 28 and the voltage level of the signal input from the fourth terminal 31 with the first voltage level (High level). It is determined whether or not to do.

  When both the voltage level of the signal input from the second terminal 28 and the voltage level of the signal input from the fourth terminal 31 coincide with the first voltage level (High level), the connection detection unit 23, the liquid crystal panel 11, the control board 12, the source boards 13 a and 13 b, the FFCs 15 a and 16 a, and the source side SOFs 17 a to 17 d are determined to be electrically connected to each other, and the liquid crystal panel 11, the control board 12, It is determined that the source substrates 13c and 13d, the gate substrates 14a and 14b, the FFCs 15b, 16b, 18, and 19, the source side SOFs 17e to 17h, and the gate side SOFs 20a to 20d are also electrically connected to each other. Then, when an inspection device that inspects the abnormality of the liquid crystal display device 10 is connected to the liquid crystal display device 10, the connection detection unit 23 outputs a signal indicating the determination result to the inspection device.

  Although the voltage level of the signal input from the second terminal 28 matches the first voltage level (High level), the voltage level of the signal input from the fourth terminal 31 is the first voltage level (High level). ) Is lower than the second voltage level (Low level), the connection detection unit 23 includes the liquid crystal panel 11 on which the first wiring path 26 is formed, the control substrate 12, the source substrates 13a and 13b, the FFC 15a, 16a and the source side SOFs 17a to 17d are electrically connected to each other, but the liquid crystal panel 11, the control substrate 12, the source substrates 13c and 13d, the gate substrates 14a and 14b in which the second wiring path 29 is formed, FFC 15b, 16b, 18, 19, connection location of any one of source side SOFs 17e to 17h and gate side SOFs 20a to 20d Determines that there is a connection failure portion that is not electrically connected. When the above-described inspection device is connected to the liquid crystal display device 10, the connection detection unit 23 outputs a signal indicating the determination result to the inspection device. As a result, it becomes easy to identify a component having a connection failure.

  Further, when the voltage level of the signal input from the second terminal 28 and the voltage level of the signal input from the fourth terminal 31 are both the second voltage level (Low level), the connection detection unit 23. Is electrically connected to the connection location of any of the components of the liquid crystal panel 11, the control board 12, the source boards 13a and 13b, the FFCs 15a and 16a, and the source side SOFs 17a to 17d in which the first wiring path 26 is formed. It is determined that there is an unsuccessful connection. In addition, the connection detection unit 23 includes the liquid crystal panel 11 on which the second wiring path 29 is formed, the control substrate 12, the source substrates 13c and 13d, the gate substrates 14a and 14b, the FFCs 15b, 16b, 18, and 19, and the source side SOFs 17e to 17e. 17h, it is determined that the electrical connection state between the components of the gate-side SOFs 20a to 20d is unknown. When the above-described inspection device is connected to the liquid crystal display device 10, the connection detection unit 23 outputs a signal indicating the determination result to the inspection device. As a result, it becomes easy to identify a component having a connection failure.

  The voltage level of the signal input from the second terminal 28 is the second voltage level (Low level), and the voltage level of the signal input from the fourth terminal 31 is the first voltage level (High level). ), The connection detection unit 23 determines that the portion of the first wiring path 26 between the second terminal 28 and the third terminal 30 is disconnected. When the above-described inspection device is connected to the liquid crystal display device 10, the connection detection unit 23 outputs a signal indicating the determination result to the inspection device.

  Similarly, the connection detector 23 detects the electrical connection state of each component using the first voltage level (High level) signal, and then detects the second voltage level (Low level) signal. Is output to the first terminal 27, and the signal input from the second terminal 28 and the signal input from the fourth terminal 31 are detected. The connection detection unit 23 then matches the voltage level of the signal input from the second terminal 28 and the voltage level of the signal input from the fourth terminal 31 with the second voltage level (Low level). It is determined whether or not to do.

  When both the voltage level of the signal input from the second terminal 28 and the voltage level of the signal input from the fourth terminal 31 coincide with the second voltage level (Low level), the connection detection unit 23, the liquid crystal panel 11, the control board 12, the source boards 13 a and 13 b, the FFCs 15 a and 16 a, and the source side SOFs 17 a to 17 d are determined to be electrically connected to each other, and the liquid crystal panel 11, the control board 12, It is determined that the source substrates 13c and 13d, the gate substrates 14a and 14b, the FFCs 15b, 16b, 18, and 19, the source side SOFs 17e to 17h, and the gate side SOFs 20a to 20d are also electrically connected to each other. When the above-described inspection device is connected to the liquid crystal display device 10, the connection detection unit 23 outputs a signal indicating the determination result to the inspection device.

  Although the voltage level of the signal input from the fourth terminal 31 coincides with the second voltage level (Low level), the voltage level of the signal input from the second terminal 28 is the first voltage level (High level). ), The connection detection unit 23 determines that current is leaking from the external circuit to the first wiring path 26. In addition, the connection detection unit 23 includes the liquid crystal panel 11 on which the second wiring path 29 is formed, the control substrate 12, the source substrates 13c and 13d, the gate substrates 14a and 14b, the FFCs 15b, 16b, 18, and 19, and the source side SOFs 17e to 17e. 17h, it is determined that there is a connection failure portion that is not electrically connected to the connection portion of any one of the gate side SOFs 20a to 20d. When the above-described inspection device is connected to the liquid crystal display device 10, the connection detection unit 23 outputs a signal indicating the determination result to the inspection device. This makes it easy to determine whether there is a leak.

  When the voltage level of the signal input from the second terminal 28 and the voltage level of the signal input from the fourth terminal 31 are both the first voltage level (High level), the connection detection unit 23. Determines that a current leaks from the external circuit to the first wiring path 26 or the second wiring path 29. When the above-described inspection device is connected to the liquid crystal display device 10, the connection detection unit 23 outputs a signal indicating the determination result to the inspection device. This makes it easy to determine whether there is a leak.

  In addition, although the voltage level of the signal input from the second terminal 28 matches the second voltage level (Low level), the voltage level of the signal input from the fourth terminal 31 is the first voltage level ( In the case of “High level”, the connection detection unit 23 determines that current leaks from the external circuit to the second wiring path 29. In addition, the connection detection unit 23 includes the liquid crystal panel 11, the control substrate 12, and the source substrates 13 c and 13 d in which the portion of the second wiring path 29 that is closer to the third terminal 30 than the portion where the current leaks is formed. , Gate substrate 14a, 14b, FFC 15b, 16b, 18, 19, determination is made that there is a connection failure point that is not electrically connected to any of the connection points of any of the source side SOFs 17e to 17h and the gate side SOFs 20a to 20d To do. When the above-described inspection device is connected to the liquid crystal display device 10, the connection detection unit 23 outputs a signal indicating the determination result to the inspection device. This makes it easy to determine whether there is a leak.

  The power supply control unit 24 is a processing unit that controls the supply of power to the liquid crystal panel 11 by the power supply unit 21 based on the result determined by the connection detection unit 23. Specifically, in the power supply control unit 24, the liquid crystal panel 11, the control board 12, the source boards 13a and 13b, the FFCs 15a and 16a, and the source side SOFs 17a to 17d are electrically connected to each other. The substrate 12, the source substrates 13c and 13d, the gate substrates 14a and 14b, the FFCs 15b, 16b, 18, and 19, the source side SOFs 17e to 17h, and the gate side SOFs 20a to 20d are also electrically connected to each other, and from an external circuit When it is determined that there is no current leakage to the first wiring path 26 or the second wiring path 29, power is supplied to the liquid crystal panel 11.

  By the connection detector 23, the liquid crystal panel 11, the control board 12, the source boards 13a and 13b, the FFCs 15a and 16a, and any of the connection points of the source side SOFs 17a to 17d, or the liquid crystal panel 11, the control board 12, the source board 13c, 13d, gate substrate 14a, 14b, FFC 15b, 16b, 18, 19, when it is determined that a connection failure has occurred at any of the connection locations of source side SOFs 17e to 17h and gate side SOFs 20a to 20d, or external When it is determined that current leaks from the circuit to the first wiring path 26 and the second wiring path 29, the power supply control unit 24 does not perform power supply to the liquid crystal panel 11.

  The source substrates 13a to 13d are substrates on which circuits for driving the source lines of the liquid crystal panel 11 are provided. The gate substrates 14a and 14b are substrates on which circuits for driving the gate lines of the liquid crystal panel 11 are provided. The FFCs 15a, 15b, 16a, 16b, 18, and 19 are flat and bendable flexible flat cables. Connectors 32a to 32l are provided at both ends of the FFCs 15a, 15b, 16a, 16b, 18, and 19. The connectors 32a to 32l are connectors for connecting wires between the FFCs 15a, 15b, 16a, 16b, 18, 19 and other components.

  The source side SOFs 17a to 17h are SOFs provided on the source substrate side. Source drivers 33a to 33h are mounted on the source side SOFs 17a to 17h. The source drivers 33a to 33h are drivers that drive the source lines of the liquid crystal panel. The gate side SOFs 20a to 20d are SOFs provided on the gate substrate side. Gate drivers 34a to 34d are mounted on the gate side SOFs 20a to 20d. The gate drivers 34 a to 34 d are drivers that drive the gate lines of the liquid crystal panel 11.

  Here, the wiring that is provided in the FFC 15a and forms a part of the first wiring path 26 connects both ends of the connector 32a that connects the FFC 15a and the control board 12, and also connects the FFC 15a and the source board 13a. It arrange | positions at the both ends of the connector 32b, respectively. In addition, the wiring that is provided in the FFC 16a and forms part of the first wiring path 26 is a connector that connects the FFC 16a and the source substrate 13b to both ends of the connector 32c that connects the FFC 16a and the source substrate 13a. It is arrange | positioned at the both ends of 32d, respectively. Further, the wirings provided on the source side SOFs 17a to 17d and constituting a part of the first wiring path 26 are connected to both ends of the portion connecting the source side SOFs 17a to 17d and the source substrates 13a and 13b, and to the source. It arrange | positions at the both ends of the location which connects the side SOF17a-17d and the liquid crystal panel 11, respectively.

  Further, the wiring provided in the FFC 15b and constituting a part of the second wiring path 29 is a connector that connects the FFC 15b and the source board 13c to both ends of the connector 32e that connects the FFC 15b and the control board 12. It is arrange | positioned at the both ends of 32f, respectively. In addition, the wiring that is provided in the FFC 16b and constitutes a part of the second wiring path 29 is a connector that connects the FFC 16b and the source substrate 13d at both ends of the connector 32g that connects the FFC 16b and the source substrate 13c. It is arrange | positioned at the both ends of 32h, respectively. Further, the wirings provided on the source side SOFs 17e to 17h and constituting a part of the second wiring path 29 are connected to both ends of the portion connecting the source side SOFs 17e to 17h and the source substrates 13c and 13d, and to the source. It arrange | positions at the both ends of the location which connects the side SOF17e-17h and the liquid crystal panel 11, respectively.

  Furthermore, the wiring provided in the FFC 18 and constituting a part of the second wiring path 29 is a connector that connects the FFC 18 and the gate substrate 14a at both ends of the connector 32i that connects the FFC 18 and the source substrate 13d. 32j is disposed at both ends of the same. Further, the wiring provided in the FFC 19 and constituting a part of the second wiring path 29 is connected to both ends of the connector 32k that connects the FFC 19 and the gate substrate 14a, and is also a connector that connects the FFC 19 and the gate substrate 14b. It is arrange | positioned at the both ends of 32l, respectively. In addition, the wirings provided on the gate side SOFs 20a to 20d and constituting a part of the second wiring path 29 are connected to both ends of the portion where the gate side SOFs 20a to 20d and the gate substrates 14a and 14b are connected to each other. It arrange | positions at the both ends of the location which connects the side SOF20a-20d and the liquid crystal panel 11, respectively.

  In this way, the wirings constituting the first wiring path 26 or the wirings constituting the second wiring path 29 are FFCs 15a, 15b, 16a, 16b, 18, 19, source side SOFs 17a to 17h, gate side SOFs 20a to All the wirings of the FFCs 15a, 15b, 16a, 16b, 18, 19 and the source side SOFs 17a to 17h and the gate side SOFs 20a to 20d are appropriately connected by arranging them at both ends of the connection part 20d. Easy to confirm.

  That is, when continuity of the first wiring path 26 and the second wiring path 29 is detected by the connection detection unit 23, the FFCs 15a, 15b, 16a, 16b, 18, 19, the source side SOFs 17a to 17h, the gate side It can be determined that the wirings at both ends of the connection locations of the SOFs 20a to 20d are appropriately connected to the wirings of other components. And when the wiring in the both ends of a connection place is appropriately connected with the wiring of another component, it can determine with the wiring between the wiring in both ends also being connected appropriately. For this reason, the FFCs 15 a, 15 b, 16 a, 16 b, 18 are arranged by arranging the respective wirings constituting the first wiring path 26 or the respective wirings constituting the second wiring path 29 as described above. 19, the connection state of all the wirings of the source side SOFs 17a to 17h and the gate side SOFs 20a to 20d can be easily confirmed.

  As described above, in the liquid crystal display device 10 of the present embodiment, the liquid crystal panel 11, the control substrate 12, the source substrates 13a to 13d, the gate substrates 14a and 14b, the FFCs 15a and 15b, 16a, 16b, 18, 19 and the source side SOF 17a. 17h, it can be easily confirmed that the gate side SOFs 20a to 20d are properly connected to other components, and the occurrence of component destruction due to poor connection between these components can be prevented appropriately.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and corrections are possible without departing from the spirit of the present invention. For example, the number of source substrates 13a to 13d, gate substrates 14a and 14b, FFCs 15a, 15b, 16a, 16b, 18, and 19, source side SOFs 17a to 17h, and gate side SOFs 20a to 20d is limited to the number shown in FIG. However, it may be more or less. In the above-described embodiment, the components that form the wiring path and detect the connection state are classified into two groups, that is, the component in which the first wiring path 26 is formed and the component in which the second wiring path 29 is formed. The group may be three or more.

  Further, the FFCs 15a, 15b, 16a, 16b, 18, 19, the source side SOFs 17a to 17h, and the gate side SOFs 20a to 20d may be other wiring members such as COF (Chip On Film) and FPC (Flexible Printed Circuit). Good.

  In the example of FIG. 1, the second wiring path 29 is branched from the first wiring path 26, but the second wiring path 29 is not branched from the first wiring path 26. It is good also as providing independently. In this case, the connection detection unit 23 outputs a signal of the first voltage level (High level) or the second voltage level (Low level) to the third terminal 30 at the end of the second wiring path 29. The liquid crystal panel 11 provided with the second wiring path 29, the control substrate 12, the source substrates 13c and 13d, the gate substrates 14a and 14b, the FFCs 15b and 16b, 18 and 19, the source side SOFs 17e to 17h, and the gate side SOF 20a. The electrical connection state of ˜20d is the electrical connection state of the liquid crystal panel 11, the control board 12, the source boards 13a and 13b, the FFCs 15a and 16a, and the source side SOFs 17a to 17d provided with the first wiring path 26. Detects independently. As a result, the connection detection unit 23 determines whether or not there is a poor connection portion that is not electrically connected to the connection portion of each component provided with the second wiring route 29. It is possible to make a determination without being affected by the conduction state, and it is easy to identify a component having a connection failure.

  In the example of FIG. 1, the first wiring path 26 or the second wiring path 29 formed in the FFCs 15a, 15b, 16a, 16b, 18, 19, the source side SOFs 17a to 17h and the gate side SOFs 20a to 20d. Passes through each part twice, but does not necessarily have to pass through each part twice. As such a path, for example, the first wiring path 26 is connected from the control board 12 to the FFC 15a, the source board 13a, the FFC 16a, the source board 13b, the source side SOF 17a, the liquid crystal panel 11, the source side SOF 17b, the source board 13b, It is conceivable that the FFC 16a, the source side SOF 17c, the liquid crystal panel 11, the source side SOF 17d, the source substrate 13a, and the FFC 15a are sequentially passed back to the control substrate 12.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device, 11 ... Liquid crystal panel, 12 ... Control board, 13a-13d ... Source board | substrate, 14a, 14b ... Gate board | substrate, 15a, 15b, 16a, 16b, 18, 19 ... FFC (Flexible Flat Cable), 17a ˜17h: Source-side SOF (System On Film), 20a-20d: Gate-side SOF (System On Film), 21: Power supply unit, 22: Control unit, 23 ... Connection detection unit, 24 ... Power supply control unit, 25 ... Power line, 26 ... First wiring, 27 ... First terminal, 28 ... Second terminal, 29 ... Second wiring, 30 ... Third terminal, 31 ... Fourth terminal, 32a to 32l ... Connectors, 33a to 33h ... source drivers, 34a to 34d ... gate drivers.

Claims (15)

A liquid crystal panel; at least one drive substrate for driving the liquid crystal panel; a control board for supplying power to the liquid crystal panel and outputting a signal for driving the liquid crystal panel; the control board; A liquid crystal display device comprising: a first wiring member that connects a driving substrate; and a second wiring member that connects the driving substrate and the liquid crystal panel;
The control board includes the first wiring board, the driving board, the second wiring member, and an input / output terminal for detecting a connection state of the liquid crystal panel, and the first wiring board, The driving substrate, the second wiring member, and the liquid crystal panel each have a connection state detection wiring, and the control substrate, the first wiring member, the driving substrate, and the second wiring. When the member and the liquid crystal panel are combined, the first wiring member, the driving substrate, the second wiring member, and the wiring for detecting the connection state of the liquid crystal panel are A liquid crystal display device connected to the input / output terminal for detecting the connection state of the control board.   When the control board, the first wiring member, the driving board, the second wiring member, and the liquid crystal panel are combined, the first wiring member, the driving board, the second board The wiring member and wiring for detecting the connection state of each of the liquid crystal panels are connected in series to the input / output terminal for detecting the connection state of the control board. Liquid crystal display device.   The first wiring board is a flat member, both ends of a connection portion where the first wiring path is connected to the control board, and the first wiring path is connected to the driving board. The liquid crystal display device according to claim 1, wherein the connection state detection wiring is provided at both ends of the connection location.   The second wiring board is a flat member, and the second wiring path is connected to the driving board and both ends of the connection portion, and the second wiring path is connected to the liquid crystal panel. The liquid crystal display device according to claim 1, wherein the connection state detection wiring is provided at both ends of the connection location.   The liquid crystal display device according to claim 1, wherein the driving substrate is a source substrate including a circuit that drives a source line of the liquid crystal panel.   The drive board is composed of at least two or more source boards, and further includes a third wiring member for connecting the source boards, and the third wiring board has wiring for detecting a connection state, the control board, When the first wiring member, the two or more source substrates, the third wiring substrate, the second wiring member, and the liquid crystal panel are combined, the first wiring member, the two or more Each connection state detection wiring of the source substrate, the third wiring substrate, the second wiring member, and the liquid crystal panel is connected to the connection state detection input / output terminal of the control substrate. The liquid crystal display device according to claim 5.   The third wiring board is a flat member, and the connection state detection wiring is provided at both ends of a connection portion where the third wiring path is connected to the source board. Item 7. A liquid crystal display device according to item 6.   The liquid crystal display device according to claim 1, wherein the driving substrate is a gate substrate including a circuit that drives a gate line of the liquid crystal panel.   The driving substrate is composed of at least two or more gate substrates, and further includes a fourth wiring member for connecting the gate substrates, and the fourth wiring substrate has wiring for detecting a connection state, the control substrate, When the first wiring member, the two or more gate substrates, the fourth wiring substrate, the second wiring member, and the liquid crystal panel are combined, the first wiring member, the two or more The connection state detection wirings of the gate substrate, the fourth wiring substrate, the second wiring member, and the liquid crystal panel are connected to the connection state detection input / output terminals of the control substrate. The liquid crystal display device according to claim 8.   The fourth wiring board is a flat member, and the connection state detection wiring is provided at both ends of a connection portion where the fourth wiring path is connected to the gate substrate. Item 10. A liquid crystal display device according to item 9.   At least one of the driving substrates is a source substrate including a circuit that drives a source line of the liquid crystal panel, and at least one of the driving substrates is a gate including a circuit that drives a gate line of the liquid crystal panel. A fifth wiring member for connecting the source substrate and the gate substrate, the fifth wiring substrate having a wiring for detecting a connection state, the control substrate, and the first wiring member , When the source substrate, the fifth wiring substrate, the gate substrate, the second wiring member, and the liquid crystal panel are combined, the first wiring member, the source substrate, the fifth substrate Wiring for detecting the connection state of each of the wiring board, the gate substrate, the second wiring member, and the liquid crystal panel is connected to the input / output terminal for detecting the connection state of the control board. The liquid crystal display device according to claim 1, characterized in that.   The fifth wiring board is a flat member, and both end portions of connection portions where the fifth wiring path is connected to the source substrate, and the fifth wiring path is connected to the gate substrate. The liquid crystal display device according to claim 11, wherein the connection state detection wiring is provided at both ends of the connection portion.   A connection detection unit that outputs a first signal to the connection state detection output terminal and detects a signal input from the connection state detection input terminal, and a detection result detected by the connection detection unit The liquid crystal display device according to claim 1, further comprising a power supply control unit that controls supply of power to the liquid crystal panel based on the above.   The connection detection unit detects signals input from the connection state detection input terminals provided in at least two locations of the connection state detection wiring, and based on the detection result of the signals, a connection failure is detected. The liquid crystal display device according to claim 13, wherein an occurrence location is determined, and information on the determined location is output.   The connection detection unit outputs the first signal to the connection state detection output terminal and then further outputs the connection state detection output terminal to a voltage level of the first signal. 15. The liquid crystal display device according to claim 13, wherein the second signal having a low voltage level is output.

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