JP4427372B2 - Evaluation equipment for liquid crystal display devices - Google Patents

Description

  The present invention relates to an evaluation apparatus for a liquid crystal display device that evaluates an image displayed on the liquid crystal display device.

  Conventionally, a moving image evaluation set 1 as an evaluation device for a liquid crystal module as this type of liquid crystal display device uses a personal computer (PC) having a printer port output as a signal source 2 as shown in FIG. . The signal source 2 is connected to a data conversion circuit board 4 via a ribbon cable 3. The data conversion circuit board 4 is connected to a product-specific circuit board 6 via a ribbon cable 5. Further, the product-specific circuit board 6 is connected to a liquid crystal module 8 as a liquid crystal display (LCD) module, which is a liquid crystal display device for mobile phones, via a flexible flat cable (FFC) 7. Has been.

  An FPGA (Field Programmable Gate Array) 11 and an oscillation circuit 12 are mounted on the data conversion circuit board 4. The FPGA 11 has a circuit function for converting a printer port output digital signal output from the signal source 2 into a CPU (Central Processing Unit) interface signal of the liquid crystal module 8. The oscillation circuit 12 generates a clock signal for synchronizing the internal circuit of the FPGA 11.

  Further, a lighting circuit 13 and a connector 14 are mounted on the circuit board 6 for each product. The lighting circuit 13 lights a light emitting diode (LED) for a light source of a backlight of the liquid crystal module 8. Further, the connector 14 converts the pitch of the pattern so that the data converted into the CPU interface signal by the FPGA 11 of the data conversion circuit board 4 can be input to the liquid crystal module 8.

  An AC / DC converter circuit 15 is connected to the lighting circuit 13 of the circuit board 6 for each product. The AC / DC converter circuit 15 secures necessary power from a household outlet and supplies about 300 mW of power to the lighting circuit 13 mounted on the circuit board 6 for each product.

  However, in the moving image evaluation set 1, since the video signal is output from the signal source 2 by the printer port output, the liquid crystal module 8 has only a transfer speed for displaying a still image. For this reason, a moving image of about 10 to 15 frames such as a camera-equipped mobile phone cannot be evaluated.

  Further, it is necessary to change the design of the lighting circuit 13 depending on the connection method of the light emitting diodes used as the backlight of the liquid crystal module 8 in series connection or parallel connection. For this reason, every time the pattern pitch of the flexible flat cable 7 for inputting the CPU interface signal to the liquid crystal module 8 changes, the design of the circuit board 6 for each product must be changed, and a huge design cost is required. .

  Further, since the lighting circuit 13 is arranged on the circuit board 6 for each product, it is necessary to supply about 300 mW of power to the lighting circuit 13, but about 300 mW is supplied to the printer port output of the signal source 2. There is no ability. For this reason, the AC / DC converter circuit 15 is required, and an external power supply corresponding to domestic and overseas is required. Therefore, the size of the entire apparatus is increased, the portability is not excellent, and weight reduction is not easy.

Therefore, as a moving image evaluation set of this type of liquid crystal module, an electronic device in which each of the first interface unit for file system data signal input / output and the second interface unit for card bus signal output is a signal source Is provided. An information storage device such as an FDD, CD-ROM, DVD, or LS120, an expansion battery, an AC adapter, a USB connector, or the like is attached to the first interface unit of the electronic device. Further, a configuration in which a PC card, a communication device, a printing device such as a printer, an information reading device such as a scanner, and the like are attached to the second interface unit of the electronic device is known (see, for example, Patent Document 1). ).
JP 2001-92564 A (page 7-11, FIG. 1 and FIG. 2)

  However, even in the moving image evaluation set of the liquid crystal module, power for turning on a light source such as a light emitting diode for turning on a liquid crystal display cannot be output from the second interface unit of the electronic device. For this reason, an additional battery, an AC adapter, or the like is attached to the first interface unit of the electronic device in order to supply power for turning on these light sources. Therefore, since these additional batteries and AC adapters are relatively heavy, there is a problem that it is not easy to reduce the weight.

  SUMMARY An advantage of some aspects of the invention is that it provides an evaluation apparatus for a liquid crystal display device that can be easily reduced in weight.

The present invention includes a signal source that outputs an interface signal and power, a card bus connected to the signal source, and a power supply circuit to which power output from the signal source is input via the card bus. A data conversion circuit that converts an interface signal output from a signal source via a bus into an interface signal necessary for the liquid crystal display device, and an interface signal converted by the data conversion circuit is converted corresponding to the liquid crystal display device. The device-specific circuit for displaying an image on the liquid crystal display device and the power input to the power supply circuit of the data conversion circuit are converted into a lighting voltage for turning on the light source of the liquid crystal display device, and the liquid crystal display device comprising a light source lighting circuit for supplying to said apparatus-specific circuit and said light source lighting circuit is provided on a circuit board different from each other It is those that.

  The interface signal output from the signal source via the card bus is converted into an interface signal necessary for the liquid crystal display device by the data conversion circuit. The interface signal converted by the data conversion circuit is converted by the device-specific circuit so as to correspond to the liquid crystal display device, and an image is displayed on the liquid crystal display device. After the power output from the signal source via the card bus is input to the power supply circuit, the power input to the power supply circuit is converted into lighting power for lighting the light source of the liquid crystal display device by the light source lighting circuit. Supply to the liquid crystal display device. As a result, power for turning on the light source of the liquid crystal display device can be output from the signal source via the card bus. This eliminates the need for a circuit for supplying power for turning on the light source of the liquid crystal display device from the outside to the light source lighting circuit, thereby further reducing the weight.

  According to the present invention, power output from a signal source via a card bus and input to a power supply circuit is converted into power for lighting that turns on the light source of the liquid crystal display device by the light source lighting circuit and supplied to the liquid crystal display device. Therefore, it is possible to output power for turning on the light source of the liquid crystal display device from the signal source via the card bus, so that a circuit for supplying the power for turning on the light source of the liquid crystal display device from the outside to the light source lighting circuit is unnecessary. Therefore, the weight can be further reduced.

  The configuration of the first embodiment of the evaluation apparatus for a liquid crystal display device of the present invention will be described below with reference to FIGS.

  In FIG. 1, reference numeral 21 denotes a moving image evaluation set of a liquid crystal module as an evaluation device for a liquid crystal display device. The moving image evaluation set 21 is a device for evaluating a moving image displayed on a liquid crystal module 22 which is a liquid crystal display (LCD) module as a liquid crystal display device for a mobile phone to be evaluated.

  The liquid crystal module 22 has a main module 22a as a first liquid crystal display unit. The main module 22a includes a rectangular flat liquid crystal panel 23 as a flat display panel. On the surface, which is one main surface of the liquid crystal panel 23, a plurality of signal lines (not shown) and a plurality of scanning lines are wired in a lattice pattern. Further, a thin film transistor (not shown), which is a pixel TFT (Thin Film Transistor) as a switching element connected to each of the signal lines and the scanning lines, is provided in the region formed by the plurality of signal lines and the scanning lines. It has been. Therefore, the thin film transistors are formed in a matrix on the liquid crystal panel 23. Therefore, the liquid crystal panel 23 employs a method of sequentially selecting a plurality of signal lines and applying a video signal within one horizontal scanning time.

  Further, as shown in FIGS. 2 and 3, the main module 22a is provided with a source driver 23a and a gate driver 23b which are drivers for driving each thin film transistor of the liquid crystal panel 23 of the main module 22a. The source driver 23a and the gate driver 23b are attached to the lower peripheral edge of the surface of the liquid crystal panel 23. Further, a power supply IC (not shown) can be attached to the lower peripheral edge of the surface of the liquid crystal panel 23.

  On the lower edge of the surface of the liquid crystal panel 23, there is one side edge of a rectangular flat driver circuit 23c that is a flexible circuit board that displays a moving image on the liquid crystal panel 23 via the source driver 23a and the gate driver 23b. It is connected. The driver circuit 23c is arranged to face the back surface of the liquid crystal panel 23 by curving one side edge that is the side connected to the liquid crystal panel 23.

  The moving image evaluation set 21 includes a signal source 24 such as a personal computer (PC). This signal source 24 is a light emitting diode (Light Emitting Diode) for a light source (not shown) as a light source built in a backlight 25 as a planar light source disposed facing the back side of the liquid crystal panel 23 of the liquid crystal module 22. : Outputs power to light LED). At the same time, the signal source 24 drives the liquid crystal module 22 to output a digital interface signal for displaying a moving image or an image.

  Further, a PC card 26 using a card bus is connected to the signal source 24. Here, the PC card 26 is a unified standard for an expansion card for a notebook personal computer jointly established by PCMCIA (Personal Computer Memory Card International Association) and JEIDA (Japan Electronics Industry Promotion Association). The card bus is a standard for a bus (data transmission path) used in the PC card 26.

  A digital interface signal is extracted from the signal source 24 using the PC card bus output output via the PC card 26. Further, the PC card 26 is provided with a rectangular flat data conversion circuit board 27. On the data conversion circuit board 27, an FPGA (Field Programmable Gate Array) 28 and a power supply circuit 29 each having a built-in oscillation circuit (not shown) are mounted and installed. Here, only the FPGA 28 is changed in the data conversion circuit board 27. Further, the digital interface signal output from the signal source 24 using the PC card bus output is input to the FPGA 28.

  The FPGA 28 also has a circuit function for converting a digital interface signal input from the signal source 24 into a CPU (Central Processing Unit) interface signal necessary for the liquid crystal module 22. An oscillation circuit built in the FPGA 28 generates a clock signal for synchronizing the internal circuit of the FPGA 28. Then, the power output from the signal source 24 using the PC card bus output is input to the power supply circuit 29, and the voltage of this power is converted from, for example, 3V to 5V.

  Furthermore, a connector 31 electrically connected to each of the FPGA 28 and the power supply circuit 29 is mounted and attached to the data conversion circuit board 27. The connector 31 is connected to a connector 34, which is an SCSI connector on the input side, mounted on a rectangular flat plate-shaped pitch conversion circuit board 33 via a skazy (Small Computer System Interface: SCSI) cable 32. Here, the CPU interface signal converted by the FPGA 28 is sent to the pitch conversion circuit board 33 via the skazy cable 32 and inputted.

  Further, an output side connector 35 is mounted on the pitch conversion circuit board 33. A first FFC (Flexible flat cable) 36 having a pitch of 0.5 mm is connected to the connector 35. The pitch conversion circuit board 33 converts the pitch of the squeegee cable 32 to the pitch of the first FFC 36, that is, a pitch of 0.5 mm.

  The first FFC 36 is connected to an input-side connector 42 provided on a rectangular flat LCD product-specific circuit board 41 as a device-specific circuit board. Here, a CPU interface signal is sent to the LCD product-specific circuit board 41 via the first FFC 36 and inputted. A connector 43 for connection is provided on the circuit board 41 for each LCD product, and a second FFC 44 connected to the liquid crystal module 22 is connected to the connector 43.

  Therefore, the LCD product-specific circuit board 41 converts the CPU interface signal input from the pitch conversion circuit board 33 via the first FFC 36 in accordance with the format of the liquid crystal module 22 to be evaluated, and then converts it to the connector. A signal for displaying an image, that is, a moving image, is supplied to the liquid crystal panel 23 of the liquid crystal module 22 by being input to the liquid crystal module 22 through the 43 and the second FFC 44. At the same time, the circuit board 41 for each LCD product receives input power, which is a part of the power whose voltage has been changed by the power supply circuit 29 of the data conversion circuit board 27, from the squeegee cable 32, the pitch conversion circuit board 33, and the first circuit. The liquid crystal panel 22 of the liquid crystal module 22 is driven by inputting the liquid crystal module 22 through the FFC 36 and the second FFC 44.

  Further, a connector 43 for connection is provided on the circuit board 41 for each LCD product, and this connector 43 is connected to each of the input-side connector 42 and the output-side connector 45. Further, a third FFC 46 is connected to the connector 43. The third FFC 46 is connected to a connector 52 provided on a rectangular flat LED lighting circuit board 51 as a light source lighting circuit board. An LED lighting circuit 53 is mounted and disposed on the LED lighting circuit board 51. That is, the LED lighting circuit 53 is supplied with electric power whose voltage has been converted by the power supply circuit 29 of the data conversion circuit board 27, respectively, for the squeegee cable 32, the pitch conversion circuit board 33, the first FFC 36, and the third FFC 46. Is input through.

  The LED lighting circuit 53 is a power supply for LED lighting. The light input to the LED lighting circuit 53 is used to turn on the light emitting diodes of the liquid crystal module 22, and a backlight configured by these light emitting diodes. It is converted into LED lighting voltage that lights 25. Further, the LED lighting circuit 53 supplies the power converted into the LED lighting voltage by the LED lighting circuit 53 to the liquid crystal module 22 via the third FFC 46, the LCD product-specific circuit board 41, and the second FFC 44. And the light emitting diodes of the liquid crystal module 22 are turned on so that an image displayed on the liquid crystal module 22, that is, a moving image can be visually recognized.

  Here, the LED lighting circuit 53 is separated from the LCD product-specific circuit board 41. Further, the LED lighting circuit 53 includes a control circuit (not shown) for lighting the light emitting diodes connected in series when the light emitting diodes of the liquid crystal module 22 are connected in series, and the light emitting diodes connected in parallel. In this case, each of the light emitting diodes is provided with a control circuit (not shown) for parallel lighting. Therefore, the LED lighting circuit 53 is configured so that a changeover switch (not shown) can be switched and used for each connection method of the light emitting diodes of the liquid crystal module 22. In other words, the LED lighting circuit 53 can light each of the light emitting diodes regardless of whether the light emitting diodes of the liquid crystal module 22 are connected in series or in parallel.

  Further, the LCD product-specific circuit board 41, the connectors 42, 43, 45 provided on the LCD product-specific circuit board 41, and the second FFC 44 are respectively connected to the liquid crystal module 22 to which the second FFC 44 is connected. This is an area A that must be redesigned and redesigned for each product.

  Next, the operation of the first embodiment will be described.

  First, the digital interface signal extracted from the signal source 24 using the PC card bus output by the PC card 26 is output to the FPGA 28 of the data conversion circuit board 27.

  At this time, the FPGA 28 converts the digital interface signal input from the signal source 24 into a CPU interface signal necessary for the liquid crystal module 22. At the same time, the oscillation circuit incorporated in the FPGA 28 generates a clock signal for synchronizing the internal circuit of the FPGA 28.

  The electric power extracted from the signal source 24 using the PC card bus output by the PC card 26 is output to the power supply circuit 29 of the data conversion circuit board 27. At this time, the power supply circuit 29 converts the voltage of the power input to the power supply circuit 29.

  Next, the CPU interface signal converted by the FPGA 28 is output to the pitch conversion circuit board 33.

  At this time, the pitch conversion circuit board 33 converts the pitch of the squeegee cable 32 to the pitch of the first FFC 36.

  Further, after the pitch conversion is performed by the pitch conversion circuit board 33, a CPU interface signal is output to the LCD product-specific circuit board 41.

  At this time, the CPU product signal inputted from the pitch conversion circuit board 33 is converted by the circuit board 41 for each LCD product in accordance with the format of the liquid crystal module 22.

  Next, the CPU interface signal converted by the circuit board 41 for each LCD product is sent to the liquid crystal module 22, and a signal for displaying a moving image on the liquid crystal panel 23 of the liquid crystal module 22 is supplied.

  At the same time, the LCD product-specific circuit board 41 sends input power, which is a part of the power whose voltage is changed in the power supply circuit 29 of the data conversion circuit board 27, to the liquid crystal module 22, and the liquid crystal module 22 The liquid crystal panel 23 is driven.

  Further, the remaining power whose voltage has been changed by the power supply circuit 29 of the data conversion circuit board 27 is output to the LED lighting circuit 53 of the LED lighting circuit board 51.

  At this time, the LED lighting circuit 53 converts the power output to the LED lighting circuit 53 into an LED lighting voltage for lighting each light emitting diode of the liquid crystal module 22.

  Thereafter, the electric power converted into the LED lighting voltage by the LED lighting circuit 53 is output to the liquid crystal module 22 to light up each light emitting diode of the liquid crystal module 22 and displayed on the liquid crystal module 22. Make the video viewable.

  As described above, according to the first embodiment, the power supply circuit 29 is mounted on the data conversion circuit board 27 of the PC card 26 connected to the signal source 24, and each light emitting diode of the liquid crystal module 22 is mounted. Electric power necessary for lighting was supplied from the signal source 24 to the LED lighting circuit board 51 via the PC card 26 by the power supply circuit 29. As a result, there is no need to provide a relatively heavy external power source such as an AD / DC converter circuit for supplying power for lighting each light emitting diode of the liquid crystal module 22 from the outside to the LED lighting circuit board 51. Become. Therefore, the moving image evaluation set 21 can be further reduced in weight, and the portability of the moving image evaluation set 21 can be greatly improved.

  Further, the digital interface signal is output from the signal source 24 to the data conversion circuit board 27 through the PC card 26 using the PC card bus output. As a result, the transfer speed of this digital interface signal can be greatly improved, and moving picture images can be displayed on the liquid crystal module 22 connected to the circuit board 41 for each LCD product from about 15 frames to about 30 frames, that is, up to 30 frames. it can.

  Further, separately from the LCD product-specific circuit board 41, each of the pitch conversion circuit board 33 and the LED lighting circuit board 51 is divided and configured to block the circuit. A circuit configuration was adopted. For this reason, when the liquid crystal module 22 connected to the LCD product-specific circuit board 41 via the second FFC 44 is changed, the area A to be redesigned is the LCD product-specific circuit board 41 and the second circuit board 41. Only FFC44. As a result, the area A that needs to be changed for each liquid crystal module 22 can be minimized as much as possible, and the design change cost of the moving picture evaluation set 21 can be reduced.

  As in the second embodiment shown in FIG. 4, the pitch conversion circuit board 33 is accommodated in the accommodation box 61 as a rectangular parallelepiped housing, and the LCD product-specific circuit board 41 is placed on the upper surface of the accommodation box 61. In addition, the LED lighting circuit board 51 and the liquid crystal module 22 are mounted, the first FFC 36 is curved in an S shape, and the pitch conversion circuit board 33 is disposed under the circuit board 41 for each LCD product. Good. In this case, since the moving image evaluation set 21 can be accommodated in a size of, for example, depth 100 mm × width 150 mm × height 65 mm, the moving image evaluation set 21 can be further downsized.

  At this time, each of the LCD product-specific circuit board 41 and the LED lighting circuit board 51 is provided on one side in the width direction of the upper surface of the housing box 61. Further, each of the LCD product-specific circuit board 41 and the LED lighting circuit board 51 is provided along the longitudinal direction of the upper surface of the housing box 61. On the other hand, the liquid crystal module 22 is provided on the other side in the width direction of the upper surface of the storage box 61. Further, the liquid crystal module 22 is provided on the other side of the circuit board 41 for each LCD product on the upper surface of the storage box 61, and is provided along the longitudinal direction of the storage box 61.

  Here, the pitch conversion circuit board 33 can also be arranged so as to overlap the LED lighting circuit board 51 or the liquid crystal module 22 on the accommodation box 61. In this case, the moving image evaluation set 21 can be further downsized as in the case where the pitch conversion circuit board 33 is disposed under the circuit board 41 for each LCD product.

  Further, as in the third embodiment shown in FIGS. 5 and 6, the second FFC 44 for connecting the liquid crystal module 22 to the LCD product-specific circuit board 41 or connected as an alternative to the second FFC 44 is shown. The FPC is bent into an L shape when viewed from the top, and the mechanism for fixing the liquid crystal module 22 is slid by moving in the horizontal direction of the housing box 61 and can be slid. By setting the LED lighting circuit board 51 to a width of 40 mm × a depth of 50 mm and a size of a width of 40 mm × a depth of 40 mm, the moving image evaluation set 21 of one size has a diagonal size from 1.8 to 2.2 inches. It is possible to correspond to the liquid crystal modules 22 having different screen sizes.

  At this time, since the liquid crystal module 22 is provided on one side of the LED lighting circuit board 51, the LED lighting circuit board 51 and the liquid crystal module 22 are not electrically connected. Therefore, since the space between the LED lighting circuit board 51 and the liquid crystal module 22 can be narrowed, compared with the case where the liquid crystal module 22 is provided on one side of the circuit board 41 for each LCD product, one side of the liquid crystal module 22 and the storage box. Since the distance between one side edge of 61 can be increased, the liquid crystal module 22 having a larger screen size can be handled.

  Further, on the upper surface of the storage box 61, a rectangular flat plate-shaped acrylic plate 62 having translucency is attached via a gap. The acrylic plate 62 is formed in a rectangular shape equal to the upper surface of the storage box 61. Therefore, the acrylic plate 62 covers the LCD product-specific circuit board 41, the LED lighting circuit board 51, and the liquid crystal module 22 mounted on the storage box 61, respectively.

  Further, as in the fourth embodiment shown in FIG. 7, by attaching a camera 63 as a photographing means for the Internet to the signal source 24, the video photographed by the camera 63 is displayed in the moving picture evaluation set 21. Since the image can be displayed on the liquid crystal module 22, the camera image display of the liquid crystal module 22 can be evaluated at the early stage of development of the liquid crystal module 22.

  Further, as in the fifth embodiment shown in FIGS. 8 to 12, the respective moving images of the main module 22a and the sub-module 71 which is a second liquid crystal display unit smaller than the main module 22a are evaluated. The moving image evaluation set 1 can be used. Here, as shown in FIGS. 9 and 10, the submodule 71 is arranged on the back side of the main module 22a, and constitutes the liquid crystal module 22 together with the main module 22a. The submodule 71 includes a rectangular flat liquid crystal panel 72 having a size of 0.9 to 1.2 diagonal as a flat display panel. The liquid crystal panel 72 is smaller than the liquid crystal panel 23 of the main module 22a, but is configured in the same manner as the liquid crystal panel 23.

  The FPGA 28 of the moving image evaluation set 1 has a circuit function for converting the digital interface signal input from the signal source 24 into a CPU interface signal necessary for each of the main module 22a and the submodule 71. Further, the LCD product-specific circuit board 41 of the moving image evaluation set 1 is connected to the base end side of the first FPC 73 which is a flexible printed circuit (FPC) having a front end side divided into two branches. Here, as this 1st FPC73, this 1st FPC can also be comprised by FFC (Flexible flat cable: Flexible flat cable).

  Further, the base end side of the first FPC 73 is connected to the connector 43 of the circuit board 41 for each LCD product. Further, the front end side of one branch piece 73a of the first FPC 73 which is divided into two forks is connected to the main module 22a. Furthermore, the tip end side of the other branch piece 73 b which is divided into the fork of the first FPC 73 is electrically connected to the submodule 71. As shown in FIG. 12, one branch piece 73 a of the first FPC 73 is bent at a right angle from the base end side of the first FPC 73. Further, the other branch piece 73b of the first FPC 73 protrudes linearly from the bent portion of the one branch piece 73a from the base end side of the first FPC 73, and then the bending direction of the one branch piece 73a. Bent at a right angle toward One branch piece 73a protrudes from the other branch piece 73b, and the submodule 71 is installed on the side of the one branch piece 73a.

  A second LED lighting circuit 74 is mounted and disposed on the LED lighting circuit board 51. In the second LED lighting circuit 74, the electric power whose voltage is converted by the power supply circuit 29 of the data conversion circuit board 27 is supplied to the squeegee cable 32, the first FFC 36, the pitch conversion circuit board 33, and the third FFC 46. Input through each. The second LED lighting circuit 74 is configured in the same manner as the LED lighting circuit 53 that is the first LED lighting circuit, and the electric power input to the second LED lighting circuit 74 is supplied to the sub-module 71. It converts into the LED lighting voltage which lights each light emitting diode.

  Further, the second LED lighting circuit 74 uses the third FFC 46, the LCD product-specific circuit board 41, and the first FPC 73 as the power converted into the LED lighting voltage by the second LED lighting circuit 74. The sub-module 71 has a function of turning on each light-emitting diode of the sub-module 71 so that an image displayed on the sub-module 71, that is, a moving image can be visually recognized. Therefore, the LED lighting circuit board 51 is constituted by the light emitting diodes of the main module 22a and the submodule 71 which are turned on by the LED lighting circuit 53 and the second LED lighting circuit 74. Two LED lighting voltages that can turn on the backlights 25 and 77 are output.

  Then, the LCD product-specific circuit board 41 supplies a CPU interface signal and input power to the main module 22a and the submodule 71 via the first FPC 73, respectively. Further, the LCD product-specific circuit board 41 uses the LED lighting circuit 53 on the LED lighting circuit board 51 and the LED lighting power supplied from the second LED lighting circuit 74 via the third FFC 46 as the first. To the main module 22a and the submodule 71 via the FPC 73.

  Specifically, the circuit board 41 for each LCD product includes a data (DATA) signal, a write (WR) signal, a read (RD) signal, and a reset (RST) among CPU interface signals input to the main module 22a and the submodule 71. Each signal is shared so as to correspond to each of the main module 22a and the submodule 71. Further, the LCD product-specific circuit board 41 converts only the chip select (CS) signal among the CPU interface signals input to the main module 22a and the submodule 71 so as to correspond to the main module 22a and the submodule 71. After that, the main module 22a and the submodule 71 are input separately.

On the LCD product circuit board 41, a slide switch 75 as a switching means is mounted and arranged. The slide switch 75 displays an image on at least one of the main module 22a and the sub module 71 by switching. Then, the slide switch 75, and the CS ₁ signal line 75a for supplying a CS ₁ signal is CS signal to the main module 22a in LCD products by circuit board 41, the sub-module 71 in this LCD product by circuit board 41 Are connected to a CS ₂ signal line 75b for supplying a CS ₂ signal, which is a CS signal.

That is, as shown in FIG. 11, the slide switch 75 connects only the CS ₁ signal according to the switch position by the switching operation of the slide switch 75, and supplies the CS ₁ signal to the main module 22a. A switch 75c is provided. Accordingly, the slide switch 75 supplies the CS ₁ signal to the liquid crystal module 22 in the first mode in which the first switch 75c is turned on, and displays the moving image only on the main module 22a. Specifically, the first switch 75c is attached to a CS ₁ signal line 75a which is a signal supply wiring for supplying a CS ₁ signal to the main module 22a. The CS ₁ signal line 75a has one end connected to the main module 22a and the other end connected to the FPGA 28.

At this time, the CPU interface signal other than the CS ₁ signal is connected to each LCD product by a signal line 75d as a signal supply wiring having one end connected to each of the main module 22a and the submodule 71 and the other end connected to the FPGA 28. Effectively supplied from the circuit board 41 to the liquid crystal module 22. Accordingly, the slide switch 75 causes the main module 22a to display a moving image by the switching operation of the slide switch 75 that turns on the first switch 75c.

Also, the slide switch 75, the switch positions by the switching operation of the slide switch 75, by connecting only the CS ₂ signal, and a second switch 75e for supplying the CS ₂ signal into sub-module 71. Therefore, the slide switch 75 supplies the CS ₂ signal to the submodule 71 in the second mode in which the second switch 75e is turned on, and displays the moving image only on the submodule 71. Specifically, the second switch 75e is attached to the CS ₂ signal line 75b is a signal supply line for supplying a CS ₂ signal into sub-module 71. The CS ₂ signal line 75b has one end connected to the submodule 71 and the other end connected to the FPGA 28. The CS ₂ signal line 75b is installed in parallel with the CS ₁ signal line 75a.

At this time, CPU interface signals other than the CS ₂ signal is also effectively fed by a signal line 75d from the LCD by product circuit board 41 to the submodule 71. Therefore, the slide switch 75 causes the submodule 71 to display a moving image by the switching operation of the slide switch 75 that turns on the second switch 75e. Here, the second switch 75e is provided in parallel to the first switch 75c. Therefore, the DC circuit constituted by the CS ₂ signal line 75b including the second switch 75e is installed in parallel with the DC circuit constituted by the CS ₁ signal line 75a including the first switch 75c. It is configured as a parallel circuit.

Further, the slide switch 75 is set to a third mode in which each of the first switch 75c and the second switch 75e is turned on by the switch position by the switching operation of the slide switch 75, and the main module 22a and A moving image is displayed on each of the submodules 71. That is, in the third mode, by switching the switch position of the slide switch 75 to the third mode, the other interface signals are sent to the main module 22a and the submodule 71 together with the CS ₁ signal and the CS ₂ signal, respectively. Therefore, the main module 22a and the sub module 71 display images simultaneously.

Here, the LCD product-specific circuit board 41 allows the main module 22a and the submodule 71 to share the DATA signal, the WR signal, the RD signal, and the RST signal, which are interface signals other than the CS ₁ signal and the CS ₂ signal. Yes. That is, the LCD product-specific circuit board 41 is configured to alternately switch the DATA signal, WR signal, RD signal, and RST signal for the main module 22a and the submodule 71 in a predetermined cycle. Therefore, the LCD product-specific circuit board 41 switches the display switching of the main module 22a and the submodule 71 alternately in turn by setting the slide switch 75 to the third mode.

  On the other hand, on the other side in the width direction of the storage box 61, there is provided a slide mechanism 76 that allows the other side of the storage box 61 to slide up and down. The slide mechanism 76 moves the other side in the width direction of the storage box 61 up and down relative to one side in the width direction of the storage box 61, and adjusts the angle of the storage box 61 to thereby adjust the main module 22a and This makes it easy to evaluate the image quality of the moving image displayed on the submodule 71.

  As described above, according to the fifth embodiment, by using the PC card path output from the signal source 24, the transfer speed of the digital interface signal is greatly improved, and the main module 22a can be obtained from 15 frames to 30 frames. Since the moving image can be displayed on each of the submodules 71, the same operational effects as in the first embodiment can be obtained.

  Here, when only one CPU interface signal (DATA signal, CS signal, WR signal, RD signal, and RST signal) output from the FPGA 28 on the data conversion circuit board 27 is output, an image is displayed only on one side. Only the main module 22a can be used for video evaluation. Further, when only one LED lighting voltage is output from the LED lighting circuit 53 on the LED lighting circuit board 51, only one backlight 25 of the main module 22a can be lit.

  Therefore, by the switching operation of the slide switch 75, the first switch 75c is turned on and the moving image is displayed only on the main module 22a, and the second switch 75e is turned on and only the sub module 71 is turned on. A second mode in which a moving image is displayed, and a third mode in which each of the first switch 75c and the second switch 75e is simultaneously turned on to display a moving image simultaneously on each of the main module 22a and the submodule 71. Any one of them can be selected as appropriate. As a result, even when the main module 22a and the sub module 71 are used as a display unit of a mobile phone in which the main module 22a is attached to the front side and the sub module 71 is attached to the back side, the main module 22a and the sub module 71 are used. Simultaneous video inspection.

  At this time, only the CS signal of the CPU interface signals to be input to the main module 22a and the sub module 71 by the LCD product circuit board 41 is configured to be input separately corresponding to the main module 22a and the sub module 71. It was. Therefore, conversion of the CPU interface signals corresponding to the main module 22a and the submodule 71 can be easily performed, and only the CS signal needs to be controlled by the slide switch 75, so that the configuration of the slide switch 75 can be simplified. .

  Further, the submodule 71 is disposed and installed at the corner on the surface of the housing box 61 between the main module 22a and the LCD product-specific circuit board 41. As a result, the moving image evaluation set 21 can be accommodated in a size of, for example, 100 mm in depth, 150 mm in width, and 65 mm in height, so that the moving image evaluation set 21 can be further reduced in size and portability can be improved.

  Further, as in the sixth embodiment shown in FIGS. 13 and 14, the accommodating portion of the main module 22 a in the accommodating box 61 can be configured to be slidable along the width direction of the accommodating box 61. At this time, the accommodation box 61 is installed with the surface of the main module 22a facing upward. Further, the storage box 61 is configured to be fixed on the storage box 61 by horizontally sliding the main module 22a. At this time, a sub-module fixing base 81 having an L-shaped cross section for fixing the sub-module 71 is attached in an overlapped state below the portion of the storage box 61 where the main module 22a is fixed.

  The sub-module fixing base 81 includes a rectangular flat plate-like main body portion 82 on which the sub-module 71 is placed and fixed. On one side edge along the width direction of the main body portion 82, an elongated trans-plate-shaped fixing piece 83 protruding downward from the one side edge is integrally attached. The fixing piece 83 is attached along the longitudinal direction of the main body portion 82, and is installed on the other side along the width direction of the surface of the storage box 61. Therefore, the submodule fixing base 81 is installed below the main module 22a with the submodules 71 facing each other with the surface facing upward.

  As a result, the submodule 71 was installed below the main module 22a on the submodule fixing base 81, and the main module 22a was configured to be slidable laterally. As a result, the moving image evaluation set 21 can be transported together with the main module 22a and the sub module 71 without destroying each of the main module 22a and the sub module 71.

  In the fifth and sixth embodiments, the liquid crystal module 22 including a total of two liquid crystal display units, ie, the main module 22a and the sub module 71 has been described. However, two or more, that is, a plurality of liquid crystal display units are used. Even the liquid crystal module 22 provided with can be used correspondingly.

It is explanatory drawing which shows 1st Embodiment of the evaluation apparatus of the liquid crystal display device of this invention. It is a description perspective view which shows the surface side of a liquid crystal display device same as the above. It is a description perspective view which shows the back surface side of a liquid crystal display device same as the above. It is a description perspective view which shows the evaluation apparatus of the liquid crystal display device of the 2nd Embodiment of this invention. It is explanatory drawing which shows the evaluation apparatus of the liquid crystal display device of the 3rd Embodiment of this invention. It is explanatory side view which shows the evaluation apparatus of a liquid crystal display device same as the above. It is a description perspective view which shows the evaluation apparatus of the liquid crystal display device of the 4th Embodiment of this invention. It is explanatory drawing which shows the evaluation apparatus of the liquid crystal display device of the 5th Embodiment of this invention. It is a description perspective view which shows the surface side of a liquid crystal display device same as the above. It is a description perspective view which shows the back surface side of a liquid crystal display device same as the above. It is explanatory drawing which shows a part of evaluation apparatus of a liquid crystal display device same as the above. It is a description perspective view which shows the evaluation apparatus of a liquid crystal display device same as the above. It is explanatory drawing which shows the evaluation apparatus of the liquid crystal display device of the 6th Embodiment of this invention. It is explanatory side view which shows the evaluation apparatus of a liquid crystal display device same as the above. It is explanatory drawing which shows the evaluation apparatus of the conventional liquid crystal display device.

Explanation of symbols

21 Movie evaluation set as an evaluation device for LCDs
22 Liquid crystal modules as liquid crystal display devices
22a Main module as first liquid crystal display
24 signal source
26 PC card as a card bus
27 Data conversion circuit board as data conversion circuit
29 Power supply circuit
33 Pitch conversion circuit board as a pitch conversion circuit
41 Circuit board for each LCD product that is a circuit board for each device as a circuit for each device
51 LED lighting circuit board which is a light source lighting circuit board as a light source lighting circuit
71 Sub-module as second liquid crystal display
75 Slide switch as switching means

Claims (7)

A signal source for outputting interface signals and power;
A card bus connected to this signal source;
A data converter that includes a power supply circuit that receives power output from the signal source via the card bus, and converts an interface signal output from the signal source via the card bus into an interface signal required for the liquid crystal display device Circuit,
A device-specific circuit for converting the interface signal converted by the data conversion circuit to correspond to the liquid crystal display device and displaying an image on the liquid crystal display device;
A light source lighting circuit that converts the power input to the power supply circuit of the data conversion circuit into a lighting voltage for lighting the light source of the liquid crystal display device and supplies the voltage to the liquid crystal display device .
The apparatus for evaluating a liquid crystal display device, wherein the device-specific circuit and the light source lighting circuit are provided on different circuit boards . The evaluation apparatus for a liquid crystal display device according to claim 1, further comprising a pitch conversion circuit that converts a pitch of the data conversion circuit into a pitch of a circuit for each device. The device-specific circuit is provided on the device-specific circuit board,
The light source lighting circuit is provided on the light source lighting circuit board,
The pitch conversion circuit is provided on a pitch conversion circuit board, and the pitch conversion circuit is disposed so as to overlap with at least one of the device-specific circuit board, the light source lighting circuit board, and the liquid crystal display device. The apparatus for evaluating a liquid crystal display device according to claim 2. The evaluation apparatus for a liquid crystal display device according to any one of claims 1 to 3, wherein the light source lighting circuit can turn on the light source regardless of whether the light source of the liquid crystal display device is connected in series or in parallel. The liquid crystal display device has a plurality of liquid crystal display units,
The data conversion circuit converts an interface signal output from a signal source via a card bus into an interface signal necessary for at least one of the plurality of liquid crystal display units,
The device-specific circuit includes switching means for displaying an image on at least one of the plurality of liquid crystal display units by switching, and converts the interface signal converted by the data conversion circuit in correspondence with the plurality of liquid crystal display units. And
The light source lighting circuit converts the power input to the power supply circuit of the data conversion circuit into a lighting voltage for lighting each of the light sources of the plurality of liquid crystal display units and supplies the converted voltage to the plurality of liquid crystal display units. 5. The evaluation apparatus for a liquid crystal display device according to claim 1, wherein the evaluation apparatus is a liquid crystal display device. The apparatus for evaluating a liquid crystal display device according to claim 5, wherein the plurality of liquid crystal display units are arranged to overlap each other. 7. The liquid crystal display device according to claim 5, wherein the device-specific circuit converts only the chip select signal among the interface signals converted by the data conversion circuit in correspondence with the plurality of liquid crystal display units. Evaluation device.

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