JP2007225792A - Liquid crystal television and substrate structure for liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substrate structure for a liquid crystal display device wherein a pattern of an inverter circuit formed on a main substrate can be utilized for noise measures of the inverter circuit when the pattern is not used. <P>SOLUTION: When AC voltage is supplied from the main substrate 40 to a backlight of a liquid crystal panel 20, an inverter substrate 45 is not used, transformers 44a and 44b are attached to an inverter transformer attachment pattern, signal line patterns P2 and P4 are connected by a jumper line JP2 and power source patterns P1 and P3 are not connected, and a branching ground pattern GND1 and the power source pattern P3 are connected by a jumper line JP3. When AC voltage is supplied from the inverter substrate 45 to the backlight; a connector 44e is attached to a connector pattern; a jumper line JP1 and the jumper line JP2 are used for connection and the jumper line JP3 is not used. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a substrate structure for a liquid crystal television and a liquid crystal display device.

  In a substrate for a liquid crystal display device and a liquid crystal television, noise is easily radiated from an inverter circuit, and in particular, a lamp harness that supplies an alternating voltage to a liquid crystal panel from an inverter transformer or an inverter circuit is likely to be a noise source.

  By the way, the inverter circuit may be mounted on the main board or may be separately mounted on the board depending on the destination and the size of the display screen. And the same main board may be used for different destinations and different sizes, and when the inverter circuit is mounted on another board, the pattern of the inverter circuit formed on the main board is not used. .

Patent Document 1 describes that, in a printed circuit board having several wiring patterns, these wiring patterns are switched by jumper lines so as to be compatible with a plurality of power destinations.
JP 09-050209 A

In the case of using an inverter circuit mounted on a separate board, the pattern of the inverter circuit formed on the main board is not used.
Accordingly, an object of the present invention is to provide a substrate structure for a liquid crystal display device and a liquid crystal television in which the pattern of the inverter circuit formed on the main substrate can be used for noise countermeasures of the inverter circuit when the pattern is not used.

  In order to solve the above-mentioned problems, in the invention according to claim 1 of the present invention, an alternating voltage is supplied to a liquid crystal panel having a flat display surface for displaying an image on a screen facing forward, and a backlight included in the liquid crystal panel. An inverter circuit, a video signal processing circuit that receives a television broadcast signal and displays an image on the liquid crystal panel, a power supply circuit that supplies a power supply voltage to the inverter circuit and the video signal processing circuit, and the inverter circuit An inverter transformer for supplying an alternating voltage to the backlight is provided in a liquid crystal television comprising: a substrate including a ground pattern formed so as to surround the substrate; and a resin cabinet containing the liquid crystal panel and the substrate. Two inverter transformer mounting patterns that can be mounted, and a cable for outputting signals to an external inverter A connector pattern to which a connector to be connected can be mounted, a branch ground pattern that branches from the ground pattern and passes between the two inverter transformer mounting patterns and supplies a ground potential to the connector, and any inverter transformer mounting A power supply pattern that supplies a power supply voltage to the connector by connecting the ground pattern across a jumper line while being formed between the pattern and the branch ground pattern, and any inverter transformer mounting pattern and the branch A control signal is supplied to the connector by being formed between the ground pattern and extending substantially in parallel with the power supply pattern between the branch ground pattern and connecting the ground pattern across a jumper line. Signal line putter A main board on which an inverter circuit is formed, a connector that is attached to an end and connected to the connector of the main board, and arranged in a substantially equal interval in the longitudinal direction and from the connector of the main board Three inverter transformers for boosting and outputting the power supply voltage supplied from the connector based on the supplied control signal to a voltage necessary for lighting the backlight, and supplying an AC voltage to the backlight When supplying an AC voltage from the main board to the backlight, an inverter transformer is attached to each of the two inverter transformer mounting patterns, and the power supply pattern is connected to the jumper line. Do not connect jumper wires to the signal line pattern. When supplying an AC voltage from the inverter board to the backlight, a connector is attached to the connector pattern, and the power pattern is connected by the jumper line. In addition, the signal line pattern is connected by a jumper line, and the branch ground pattern and the power supply pattern are not connected.

In order to achieve the above object, in the substrate structure for a liquid crystal display device according to claim 2, an inverter circuit that supplies an alternating voltage to a backlight included in the liquid crystal panel, and a predetermined video signal is input to the liquid crystal A liquid crystal display comprising: a video signal processing circuit for displaying video on a panel; a power supply circuit for supplying a power supply voltage to the inverter circuit and the video signal processing circuit; and a ground pattern formed so as to surround the inverter circuit In the device substrate structure, two inverter transformer mounting patterns capable of mounting an inverter transformer for supplying an AC voltage to the backlight and a connector pattern capable of mounting a connector to which a cable for outputting a signal to an external inverter is connected And the two inverter transformers branched from the ground pattern. A branch ground pattern for supplying a ground potential to the connector passing between the attached patterns, and between the inverter transformer mounting pattern and the branch ground pattern, and straddling the ground pattern with the first bridging member The first signal line pattern for supplying a voltage signal to the connector by being connected at the above, and between the branch ground pattern while being formed between any inverter transformer mounting pattern and the branch ground pattern A second signal line pattern that extends substantially in parallel with the first signal line pattern and supplies a voltage signal to the connector by being connected across the ground pattern with a second bridging member. The voltage signal is supplied from the main board on which the inverter circuit is formed and the connector. An inverter board having an inverter circuit capable of supplying an AC voltage to the backlight, and when supplying an AC voltage from the main board to the backlight, the inverter transformer mounting pattern is used without using the inverter board. Attach an inverter transformer to connect the second bridging member and not the first bridging member, and connect the branch ground pattern and the first signal line pattern with a third bridging member. When supplying an AC voltage from the inverter board to the backlight, a connector is attached to the connector pattern, the first bridging member and the second bridging member are connected, and the third bridging member is connected. This is a configuration that does not.
In the invention according to claim 2 configured as described above, when the AC voltage is supplied from the main substrate to the backlight, the first signal line pattern functions as a ground in addition to the branch ground pattern. The voltage signal flowing through the second signal line pattern is less affected by noise radiated from the inverter circuit, and when the AC voltage is supplied from the inverter board to the backlight, the second signal line In addition to the pattern, the first signal line pattern is used as a line for supplying a voltage signal to the inverter board.
Further, the first signal line pattern and the second signal line pattern may be a line for supplying power or a line for transmitting a control signal, and other lines for supplying various voltage signals. It can be used.

As described above, according to the present invention, by forming the wiring that becomes the signal line / GND line by switching the jumper, it becomes GND when the inverter transformer is used and has a stabilizing effect, and when the inverter transformer is not used. It becomes a signal line and brings two effects in one pattern. Therefore, it is possible to provide a substrate structure for a liquid crystal display device in which a pattern design that is strong against noise is made while arranging parts and patterns in a minimum area.
Further, it is needless to say that the more specific configuration as in claim 1 has the same effect as that of the above-described invention of claim 2.

Hereinafter, embodiments of the present invention will be described in the following order.
(1) Schematic structure of liquid crystal television:
(2) Substrate structure for liquid crystal television:
(3) Summary:

(1) Schematic structure of liquid crystal television:
1 and 2 show a schematic structure of a liquid crystal television 100 according to the present invention in a perspective view. FIG. 1 is a view when an inverter circuit is mounted on the main board 40, and FIG. 2 is a view when an inverter board 45 is separately provided without mounting the inverter circuit on the main board 40.

  In both figures, the liquid crystal television 100 is disposed inside a resin television cabinet formed by a front cabinet 10 and a rear cabinet 30 from the front to the rear, the liquid crystal panel 20 and the main board 40 (in FIG. 2, the main board 40). The board 40 and the inverter board 45) are accommodated in this order. The front cabinet 10 is configured by a front surface 11 having an opening 16 formed substantially at the center, and side surfaces extending substantially rearward from the upper, lower, left and right sides of the front surface 11.

  The liquid crystal panel 20 has a flat display surface for displaying an image on a screen facing the front, and generally includes a panel portion and a backlight portion. The panel part is configured by layering members such as a polarizing plate, a glass substrate, a liquid crystal, a light guide plate, and a reflection plate, and the backlight part is a fluorescent light disposed near the upper and lower side edges of the light guide plate. Composed by a tube. The panel section is connected to an IC 42a that is mounted on the main board 40 and operates as a microcomputer, and the backlight section is connected to an inverter block 44 that is also mounted on the main board 40.

  The front surface 11 covers the liquid crystal panel 20 from the front, and exposes the image display surface of the liquid crystal panel 20 to the outside through the opening 16. The rear cabinet 30 is connected to the rear end of the front cabinet 10 and covers the liquid crystal panel 20 and the main board 40 from the rear.

  The main substrate 40 is a substrate adopting the substrate structure for a liquid crystal television according to the present invention, and is a single paper phenol substrate as a whole having a substantially rectangular shape. As the main substrate 40, various substrates such as a paper epoxy substrate, a glass epoxy substrate, and a Teflon (registered trademark) substrate can be adopted in addition to the paper phenol substrate, but in this embodiment, paper is used as an insulator. Adopting cheap and used paper phenol. The main board 40 is disposed so that the mounting surface on which the IC 42 a is mounted faces the back surface of the liquid crystal panel 20.

(2) Substrate structure for liquid crystal television:
FIG. 3 schematically shows an arrangement position of each electronic circuit on the main board 40. The main board 40 is a single-layer board in which the wiring pattern P is arranged only on one side. However, only a part of the existing wiring pattern P is shown in FIG.

  The pattern of the main board 40 is composed of three blocks: an inverter block 44, a video signal processing block 41, and a power supply block 43. The blocks are electrically insulated from each other by a ground pattern, and the blocks are connected by cables or jumper wires. That is, the inverter block is formed by being surrounded by the end of the main substrate 40 and the ground pattern.

  The inverter block 44 is mounted with an inverter circuit for supplying an AC voltage to a backlight included in the liquid crystal panel, the video signal processing block 41 is mounted with an analog processing circuit and a digital processing circuit, and the power supply block 43 is provided with each block. A power supply circuit that supplies a power supply voltage to each part of the circuit and the liquid crystal television 100 is mounted. The analog processing circuit includes a tuner 41b and an input / output terminal 41a. The analog processing circuit performs analog processing on the television broadcast signal received by the tuner 41b and the video / audio signal input from the input / output terminal 41a. The digital processing circuit performs analog processing. An analog video / audio signal input from the circuit is digitally processed by the IC 42a, and an output terminal for sending a panel drive signal to the liquid crystal panel is provided.

  That is, all the electronic circuits necessary for driving the liquid crystal television 100 can be mounted on one single-layer substrate. Here, the analog processing circuit and the digital processing circuit mounted on the video signal processing block 41 constitute a video signal processing circuit that receives a predetermined video signal and displays the video on the liquid crystal panel.

  Further, a circuit corresponding to the inverter circuit in the main board 40 and a control signal and a power supply voltage supplied from the outside of the inverter board 45 are input to the inverter board 45 created on a board different from the main board 40. Terminal for the purpose. Of course, the inverter circuit mounted on the main board 40 and the inverter circuit mounted on the inverter board 45 may have different destinations and corresponding liquid crystal panel sizes, and the number of inverter transformers and lamp harnesses are connected. The number of sockets to be output and the frequency and voltage of the output AC voltage may be different from each other.

(3) Structure around the inverter circuit:
FIG. 4 shows a schematic configuration of the inverter block 44 when the inverter circuit is mounted on the main board 40. In the figure, the inverter circuit in the inverter block 44 is roughly composed of transformers 44a and 44b, sockets 44c and 44d, ground pattern GND0, branch ground pattern GND1, signal line patterns P2 and P4, and power supply patterns P1 and P3. With. In the figure, the connector 44e is not mounted.

  The transformers 44a and 44b are inverter transformers, which are respectively attached to two inverter transformer mounting patterns formed on the main board 40, and boost the power supply voltage supplied from the power supply circuit to a voltage required for backlight lighting. Output. A lamp harness connected to the backlight of the liquid crystal panel 20 is connected to the sockets 44c and 44d, and the voltage output from the transformers 44a and 44b is supplied to the backlight to turn on the backlight.

  The ground pattern GND0 surrounds a portion of the inverter circuit that does not face the end of the main substrate 40, thereby reducing the influence of noise radiated from the inverter circuit on other circuits and radiating from other circuits. The influence of noise on the inverter circuit is also reduced.

  The branch ground pattern GND1 branches from the ground pattern GND0, extends between the transformer 44a and the transformer 44b to the vicinity of the end portion of the main board 40, and is connected to the pattern for mounting the connector 44e. Supply. The branch ground pattern GND1 is arranged so as to divide the transformer 44a and the transformer 44b, and has an effect of reducing the influence of noises generated by the transformers 44a and 44b on each other.

  The power supply patterns P1 and P3 are formed by connecting the ground pattern GND0 across the first bridging member while being formed between the inverter transformer mounting pattern of one of the transformers 44a and 44b and the branch ground pattern GND1. The power supply voltage is supplied to the pattern for mounting 44e. In the figure, the first bridging member is not connected, and the power supply voltage is not supplied to the power supply pattern P3. Therefore, in this embodiment, the power signal P1, P3 constitutes the first signal line pattern, and the voltage signal supplied when the first signal line pattern is connected by the first bridging member. Means power supply voltage.

  That is, the power supply pattern P3 is formed between the transformer 44a and the branch ground pattern GND1 substantially in parallel with the branch ground pattern GND1 from the pattern for mounting the connector 44e to the front of the ground pattern GND0, and sandwiches the ground pattern GND0. Thus, the power supply pattern P1 is formed. That is, the power supply patterns P1 and P3 are not electrically connected, and the power supply pattern P1 is supplied with the power supply voltage from the power supply circuit, but the power supply pattern P3 is not supplied with the power supply voltage.

  On the other hand, the power supply pattern P3 is connected to the branch ground pattern GND1 by a third bridging member. That is, in FIG. 4, the power supply pattern P3 is supplied with a ground potential from the branch ground pattern GND1, and functions as a ground. Accordingly, the ground pattern formed between the transformers 44a and 44b has a combined area of the branch ground pattern GND1 and the power supply pattern P3, and is formed at a position with a lot of noise radiation surrounded by the transformer and the lamp harness. Even with the signal line pattern P4, the signal can be transmitted with almost no influence of noise.

  The signal line patterns P2 and P4 are formed between one of the inverter transformer mounting patterns of the transformers 44a and 44b and the branch ground pattern GND1, and are substantially parallel with the power supply pattern P3 interposed between the branch ground pattern GND1. And a control signal is supplied to the pattern for mounting the connector 44e by connecting the ground pattern GND0 across the second bridging member. In this embodiment, the signal line patterns P2 and P4 constitute the second signal line pattern, and the voltage signal supplied when the second signal line pattern is connected by the second bridging member; Means a control signal.

  That is, the signal line pattern P4 is substantially parallel to the branch ground pattern GND1 from the pattern for mounting the connector 44e to the front of the ground pattern GND0 while the power supply pattern P3 is sandwiched between the signal line pattern P4 and the branch ground pattern GND1. The ground pattern GND0 is formed across the jumper line JP2 and connected to the signal line pattern P2. Therefore, the control signal output from the video signal processing circuit is supplied to the signal line pattern P4. Although not shown in the figure, a control signal is also supplied from the signal line pattern P4 to the inverter circuit formed in the inverter block 44.

  Next, with reference to FIG. 5, a schematic configuration of the inverter block 44 and the inverter board 45 when the inverter board 45 is created as a separate board without mounting the inverter circuit on the main board 40 will be described. In the figure, the inverter block 44 is generally composed of a connector 44e, a ground pattern GND0, a branch ground pattern GND1, power supply patterns P1 and P3, and signal line patterns P2 and P4. The inverter circuit on the inverter board 45 is generally composed of transformers 45a, 45b, and 45c, sockets 45d, 45e, and 45f, and a connector 45g.

  It is assumed that the inverter board 45 in the figure is compatible with a backlight having a larger number of fluorescent tubes than the corresponding fluorescent tube of the backlight in the inverter circuit of the main board 40, and the number of transformers and sockets. There are many. Of course, the number of transformers and sockets included in the inverter board 45 can be changed as appropriate, such as the same number as the main board, a small number, and a large number.

  In FIG. 5, the shape and configuration of the ground pattern GND0 and the branch ground pattern GND1 are the same as those in FIG. 4, but the transformer and socket are not mounted. That is, the transformers 44a and 44b are not attached to the inverter transformer attachment pattern, and the sockets 44c and 44d are not attached to the socket attachment pattern, and neither pattern is used.

  In FIG. 5, the positions and shapes of the power supply patterns P1 and P3 are the same as in FIG. 4, but since the first bridging member is connected, the power supply voltage is supplied to the power supply pattern P3. That is, the power supply patterns P1 and P3 are electrically connected, and the power supply voltage is supplied from the power supply pattern P1 to the power supply pattern P3 via the jumper line JP1. Of course, the jumper line JP3 is not connected at this time.

  In FIG. 5, the positions and shapes of the signal line patterns P2 and P4 are the same as those in FIG. 4, and the signal line pattern P2 and the signal line pattern P4 are connected by the jumper line JP2. is there. That is, the control signal output from the video signal processing circuit to the signal line pattern P2 is supplied to the signal line pattern P4 via the jumper line JP2, and the control signal can be output from the connector 44e.

  The connector 44e is attached to a connector pattern formed in the inverter block 44, and a cable 82 for outputting a control signal and a power supply voltage to an external inverter is connected. That is, the connector 44e can be connected to the cable 82 for supplying the control signal and the power supply voltage to the inverter board 45. That is, a ground potential is supplied to the connector 44e from the branch ground pattern GND1, a power supply voltage is supplied from the power supply pattern P3, a control signal is supplied from the signal line pattern P4, and the ground potential and the power supply voltage are supplied via the cable 82. And a control signal can be supplied.

  The connector 45g is attached to the end of the inverter board 45, and the control signal, the power supply voltage, and the like can be supplied to the inverter board 45 by connecting the cable 82. That is, the control signal, the power supply voltage, and the ground potential output from the connector 44e of the main board 40 are supplied to each circuit formed on the inverter board 45.

  Transformers 45a, 45b, and 45c are inverter transformers. In FIG. 5, the transformers 45a, 45b, and 45c are respectively attached to three inverter transformer mounting patterns that are arranged in the longitudinal direction of the inverter board 45 at substantially equal intervals, and are supplied from a connector 45g. Based on the control signal, the power supply voltage supplied from the connector 45g is boosted to a voltage required for backlight lighting and output.

  A lamp harness connected to the backlight of the liquid crystal panel 20 is connected to the sockets 45d, 45e, and 45f. The voltage output from the transformers 45a, 45b, and 45c is supplied to the backlight to turn on the backlight.

(4) Summary:
That is, when the AC voltage is supplied from the main board 40 to the backlight of the liquid crystal panel 20, the inverter board 45 is not used, but the transformers 44a and 44b are attached to the inverter transformer attachment pattern, and the signal line pattern P2 and the signal line pattern P4. Are connected by a jumper line JP2, and the power supply pattern P1 and the power supply pattern P3 are not connected, the branch ground pattern GNS1 and the power supply pattern P3 are connected by a jumper line JP3, and an AC voltage is supplied from the inverter board 45 to the backlight. Is supplied to the connector pattern, the jumper line JP1 and the jumper line JP2 are connected, and the jumper line JP3 is not connected.

As described above, in the substrate structure for a liquid crystal display device according to claim 2 corresponding to the present embodiment, the inverter circuit that supplies an AC voltage to the backlight included in the liquid crystal panel, and the predetermined video signal is input. A liquid crystal comprising: a video signal processing circuit for displaying a video on a liquid crystal panel; a power supply circuit for supplying a power supply voltage to the inverter circuit and the video signal processing circuit; and a ground pattern formed so as to surround the inverter circuit. In the display device substrate structure, a connector to which two inverter transformer mounting patterns capable of mounting an inverter transformer for supplying an AC voltage to the backlight and a connector to which a cable for outputting a signal to an external inverter is connected can be mounted. Branch from the ground pattern and the two inverters A branch ground pattern for supplying a ground potential to the connector through the wiring mounting patterns, and between the inverter transformer mounting pattern and the branch ground pattern, the ground pattern is formed by the first bridging member. A first signal line pattern for supplying a voltage signal to the connector by being connected across the bridge, and between the branch ground pattern while being formed between any of the inverter transformer mounting patterns and the branch ground pattern A second signal line pattern that extends substantially in parallel with the first signal line pattern and supplies a voltage signal to the connector by being connected across the ground pattern with a second bridging member; The voltage signal is supplied from the main board on which the inverter circuit is provided and the connector. And an inverter board having an inverter circuit capable of supplying an AC voltage to the backlight, and when the AC voltage is supplied from the main board to the backlight, the inverter transformer is not used. Attach the inverter transformer to the mounting pattern, connect the second bridging member and not the first bridging member, and connect the branch ground pattern and the first signal line pattern with the third bridging member. When connecting and supplying an AC voltage from the inverter board to the backlight, a connector is attached to the connector pattern, the first bridging member and the second bridging member are connected, and the third bridging member Are not connected.
That is, when an AC voltage is supplied from the main board to the backlight, the first signal line pattern functions as a ground in addition to the branch ground pattern, so that the voltage signal flowing through the second signal line pattern. Is less susceptible to noise radiated from the inverter circuit, and when supplying an AC voltage from the inverter board to the backlight, the first signal line pattern is added to the second signal line pattern in addition to the second signal line pattern. Used as a line for supplying a voltage signal to the inverter board.

Further, the first signal line pattern and the second signal line pattern may be a line for supplying power or a line for transmitting a control signal, and other lines for supplying various voltage signals. It can be used.
According to the second aspect of the present invention configured as described above, by forming a wiring that becomes a signal line / GND line by switching a jumper, when the inverter transformer is used, it becomes GND and brings about a stabilizing effect. When the transformer is not used, it becomes a signal line and provides two effects with one pattern. Therefore, it is possible to provide a substrate structure for a liquid crystal display device in which a pattern design that is strong against noise is made while arranging parts and patterns in a minimum area.

  Based on the above configuration, the invention of claim 1 is a liquid crystal panel having a flat display surface for displaying an image on a screen facing forward, and an inverter circuit for supplying an AC voltage to a backlight included in the liquid crystal panel. A video signal processing circuit that receives a television broadcast signal and displays video on the liquid crystal panel, a power supply circuit that supplies a power supply voltage to the inverter circuit and the video signal processing circuit, and surrounds the inverter circuit An inverter transformer for supplying an AC voltage to the backlight can be attached to a liquid crystal television including a substrate including a ground pattern formed on the substrate and a resin cabinet containing the liquid crystal panel and the substrate. Two inverter transformer mounting patterns and a cable to connect a signal output cable to an external inverter A connector pattern that can be attached to the connector, a branch ground pattern that branches from the ground pattern and passes between the two inverter transformer mounting patterns and supplies a ground potential to the connector, and any one of the inverter transformer mounting pattern and the branch A power supply pattern that supplies a power supply voltage to the connector by connecting the ground pattern across a jumper line while being formed between the ground pattern, one of the inverter transformer mounting patterns, and the branch ground pattern A signal line pattern that extends substantially in parallel with the power supply pattern between the branch ground pattern while being formed between them and supplies a control signal to the connector by connecting the ground pattern across a jumper line And A main board on which a barter circuit is formed, a connector attached to the end and connected to the connector of the main board, and a control that is arranged side by side at substantially equal intervals in the longitudinal direction and supplied from the connector of the main board An inverter circuit capable of supplying an AC voltage to the backlight; and three inverter transformers for boosting and outputting the power supply voltage supplied from the connector based on the signal to a voltage necessary for lighting the backlight. When supplying an AC voltage from the main board to the backlight, the inverter transformer is attached to the two inverter transformer mounting patterns, the power supply pattern is connected by the jumper wire, Do not connect jumper wires to the signal line pattern. When connecting the power supply pattern with a jumper wire and supplying an AC voltage from the inverter board to the backlight, a connector is attached to the connector pattern, the power supply pattern is connected with the jumper wire, and the signal The line pattern is connected by a jumper line, and the branch ground pattern and the power supply pattern are not connected.

Needless to say, the present invention is not limited to the above embodiments. It goes without saying for those skilled in the art,
・ Applying mutually interchangeable members and configurations disclosed in the above embodiments by appropriately changing the combination thereof.− Although not disclosed in the above embodiments, it is a publicly known technique and the above embodiments. The members and configurations that can be mutually replaced with the members and configurations disclosed in the above are appropriately replaced, and the combination is changed and applied. It is an embodiment of the present invention that a person skilled in the art can appropriately replace the members and configurations that can be assumed as substitutes for the members and configurations disclosed in the above-described embodiments, and change the combinations and apply them. It is disclosed as.

A perspective view showing a schematic structure of a liquid crystal television A perspective view showing a schematic structure of a liquid crystal television Diagram showing the location of each electronic circuit on the board Diagram showing the pattern around the inverter circuit Diagram showing the pattern around the inverter circuit

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Front cabinet 11 ... Front surface 16 ... Opening 20 ... Liquid crystal panel 30 ... Rear cabinet 40 ... Main board 80 ... Interface 100 ... Liquid crystal television 41 ... Video signal processing block 41a ... Input / output terminal 41b ... Tuner 42a ... IC
42b, 42c ... connector 43 ... power supply block 43a ... rectifier circuit 43b ... transformer 43c ... cable 44 ... inverter block 44a, 44b ... inverter transformer 44c, 44d ... socket 44e ... connector P1, P3 ... power supply pattern P2, P4 ... signal line pattern JP1-3 ... Jumper wire GND ... Ground 45 ... Inverter board 45a-45c ... Inverter transformer 45d-45f ... Socket 45g ... Connector 82 ... Lamp harness

Claims (2)

A liquid crystal panel with a flat display surface facing the front for displaying images on the screen;
An inverter circuit that supplies an AC voltage to a backlight included in the liquid crystal panel, a video signal processing circuit that receives a television broadcast signal and displays an image on the liquid crystal panel, and the inverter circuit and the video signal processing circuit. A substrate comprising: a power supply circuit for supplying a power supply voltage; and a ground pattern formed so as to surround the inverter circuit;
A resin cabinet for housing the liquid crystal panel and the substrate;
In LCD televisions with
From the above-mentioned ground pattern, two inverter transformer mounting patterns that can mount an inverter transformer that supplies an AC voltage to the backlight, a connector pattern that can be connected to a cable for outputting a signal to an external inverter, and the like A branch ground pattern that branches and passes between the two inverter transformer mounting patterns to supply a ground potential to the connector, and the ground pattern is formed between any of the inverter transformer mounting patterns and the branch ground pattern. A power supply pattern for supplying a power supply voltage to the connector by straddling the jumper line, and between the branch ground pattern while being formed between any inverter transformer mounting pattern and the branch ground pattern A signal line pattern that extends substantially in parallel with the power supply pattern and supplies a control signal to the connector by connecting the ground pattern across a jumper line; and a main board on which an inverter circuit is formed, ,
A connector attached to the end and connected to the connector of the main board, and arranged in a longitudinal direction at substantially equal intervals and supplied from the connector based on a control signal supplied from the connector of the main board Three inverter transformers that boost and output a power supply voltage to a voltage necessary for lighting the backlight, and an inverter board including an inverter circuit capable of supplying an AC voltage to the backlight;
With
When supplying an AC voltage from the main board to the backlight, an inverter transformer is attached to each of the two inverter transformer mounting patterns, the power supply pattern is connected by the jumper line, and a jumper is connected to the signal line pattern. Without connecting the wires, connect the branch ground pattern and the power supply pattern with jumper wires,
When supplying an AC voltage from the inverter board to the backlight, a connector is attached to the connector pattern, the power supply pattern is connected by the jumper wire, the signal line pattern is connected by a jumper wire, A liquid crystal television characterized by not connecting a branch ground pattern and the power supply pattern. An inverter circuit for supplying an AC voltage to a backlight included in the liquid crystal panel;
A video signal processing circuit for inputting a predetermined video signal and displaying the video on the liquid crystal panel;
A power supply circuit for supplying a power supply voltage to the inverter circuit and the video signal processing circuit;
A ground pattern formed so as to surround the inverter circuit;
In a substrate structure for a liquid crystal display device comprising:
From the above-mentioned ground pattern, two inverter transformer mounting patterns that can mount an inverter transformer that supplies an AC voltage to the backlight, a connector pattern that can be connected to a cable for outputting a signal to an external inverter, and the like A branch ground pattern that branches and passes between the two inverter transformer mounting patterns to supply a ground potential to the connector, and the ground pattern is formed between any of the inverter transformer mounting patterns and the branch ground pattern. The first signal line pattern for supplying a voltage signal to the connector by being connected across the first bridging member, while being formed between any inverter transformer mounting pattern and the branch ground pattern Branch ground pattern A second signal for supplying a voltage signal to the connector by extending substantially parallel with the first signal line pattern between them and connecting the ground pattern across the second bridging member A main board on which an inverter circuit comprising a line pattern is formed;
An inverter board comprising an inverter circuit that is supplied with the voltage signal from the connector and can supply an alternating voltage to the backlight;
With
When supplying AC voltage from the main board to the backlight, without using the inverter board, the inverter transformer is attached to the inverter transformer mounting pattern, the second bridge member is connected and the first bridge is connected. The member is not connected, the branch ground pattern and the first signal line pattern are connected by a third bridging member,
When supplying an AC voltage from the inverter board to the backlight, a connector is attached to the connector pattern, the first bridging member and the second bridging member are connected, and the third bridging member is not connected. A substrate structure for a liquid crystal display device.

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