JP2007240627A - Adjustment device for liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust a liquid crystal display device so that a flicker is minimized by preventing direct incidence of radiation light in a light receiving surface from a light source and detecting a reflection light quantity from a liquid crystal panel by using a photo sensor. <P>SOLUTION: Since the adjustment device has a direct incidence prevention means for preventing direct incidence of radiation light radiated from a light emitting surface of the light source on the light receiving surface of a detecting device 22, direct incidence of the radiation light from the light source in the light receiving surface is prevented and the radiation light is reflected by the liquid crystal panel 12 to be made incident in the light receiving surface. The potential of a common electrode of the liquid crystal display device 10 is adjusted so that the flicker is minimized based on the reflection light quantity detected by the detecting device. Thereby, direct incidence of radiation light from the light source in the receiving surface of the detecting device is prevented by a simple constitution, change of the reflection light quantity reflected by an electrode of a pixel in a light transmission state of the liquid crystal display device is detected with high sensitivity and the potential of the common electrode of the liquid crystal display device can be accurately adjusted so that the flicker is minimized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for adjusting the flicker to a minimum in a liquid crystal display device in which pixels are arranged in a matrix.

   Patent Document 1 describes a liquid crystal display panel inspection apparatus that irradiates light from the front surface of a reflective liquid crystal panel and inspects the quality of an image displayed based on the intensity of reflected light of each pixel. Yes. In this inspection apparatus, a panel-type illuminator 10 including a light guide plate 11 and a fluorescent lamp 12 with a reflector 13 is disposed on an upper portion of a liquid crystal panel 20 for inspection. A plurality of grooves 14 a, 14 b,..., 14 n having a wedge-shaped cross section are formed on the surface of the light guide plate 11 away from the liquid crystal panel 20 so as to be parallel to the fluorescent lamp 12.

When inspecting the display state of the liquid crystal panel 20, a drive signal is given to the drive circuit in a state where the liquid crystal panel 20 is irradiated by the panel type illuminator 10, and a test image is displayed on the liquid crystal panel 20, and the inspector observes the test image. is doing. At this time, the light beam from the fluorescent lamp 12 is incident on the light guide plate 11, and the light beam incident on the reflection surface 15 of each groove portion 14 is bent approximately 90 degrees and enters each pixel of the liquid crystal panel 20. The light beam that has passed through each pixel in a state of transmitting light is reflected by the lower electrode 26, passes through each pixel again, enters the light guide plate 11, passes through the reflecting surface 15 having an incident angle smaller than the critical angle, and enters the panel. The light is emitted outward from the upper surface of the mold illuminator 10, and the image is observed by an inspector.
Japanese Unexamined Patent Publication No. 2000-249998 (page 3, FIG. 1)

  In the liquid crystal display panel inspection apparatus described in Patent Literature 1, since an operator visually observes an image output outward from the upper surface of the panel-type illuminator 10 to determine whether the product is good or not, the products vary. The problem was that the eyes of the workers were tired. In addition, since a plurality of grooves must be accurately formed in the test image light guide plate 11, there is a problem that the apparatus is expensive.

   The present invention has been made to solve such a problem, and by preventing the irradiation light irradiated from the light source from directly entering the light receiving surface of the detection device, the reflected light is reflected by the liquid crystal panel. It is an object of the present invention to provide a device that adjusts a liquid crystal display device so that flicker is minimized by detecting high sensitivity with a detection device.

  In order to solve the above-described problem, the structural feature of the invention according to claim 1 is that a light source device including a light source that irradiates irradiation light from a light emission surface to a front surface of a liquid crystal panel of a liquid crystal display device; A detection device arranged to face the front surface of the liquid crystal panel so that reflected light reflected by the liquid crystal panel is incident, and the liquid crystal so that flicker is minimized based on the amount of reflected light detected by the detection device A liquid crystal display adjustment device provided with a means for adjusting the potential of the common electrode of the display device, wherein the light source device prevents direct incidence of the irradiation light on the light receiving surface of the detection device. It is equipped with.

  According to a second aspect of the present invention, in the first aspect of the present invention, the direct incident prevention unit includes a light receiving surface of the detection device that faces the front surface of the liquid crystal panel, and a light emitting surface of the light source. It is the structure arrange | positioned on the side of the said detection apparatus facing the front surface of the said liquid crystal panel.

  According to a third aspect of the present invention, in the first aspect, the direct incident preventing means is disposed between the light source and the detection device, and the irradiation light is directly on the light receiving surface of the detection device. An adjustment device for a liquid crystal display device, characterized by being a light-shielding body that prevents incidence.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the direct incident preventing unit includes an optical axis perpendicular to the light receiving surface of the detection device and an optical axis perpendicular to the light emitting surface of the light source. The light receiving surface and the light emitting surface are arranged to face the front surface of the liquid crystal panel while being inclined at an equal angle with respect to the normal line of the front surface of the liquid crystal panel.

  According to a fifth aspect of the present invention, in the first aspect of the present invention, the direct incident preventing unit is configured such that the irradiation light from the light source is bent by a half mirror to irradiate the front surface of the liquid crystal panel. Is a configuration in which the reflected light reflected by the liquid crystal panel passes through the half mirror and is incident on the light receiving surface of the detection device.

   In the invention according to claim 1 configured as described above, since the irradiation light irradiated from the light emitting surface of the light source is prevented from directly entering the light receiving surface of the detection device, the light-transmitting pixel of the liquid crystal display device The change in the amount of reflected light reflected by the electrodes can be detected with high sensitivity, and the potential of the common electrode of the liquid crystal display device can be accurately adjusted so as to minimize flicker.

   In the invention according to claim 2 configured as described above, the light receiving surface of the detection device is disposed to face the front surface of the liquid crystal panel, and the light emission surface of the light source faces to the front surface of the liquid crystal panel. Therefore, it is possible to prevent the irradiation light irradiated from the light emitting surface from directly entering the light receiving surface with a simple configuration, and to detect the change in the amount of reflected light reflected by the liquid crystal panel with high sensitivity. .

   In the invention according to claim 3 configured as described above, since the light-shielding body is disposed between the light-emitting surface of the light source and the light-receiving surface of the detection device, the irradiation light irradiated from the light-emitting surface is incident on the light-receiving surface. Direct incidence can be prevented with a simple configuration, and a change in the amount of reflected light from the liquid crystal panel can be detected with high sensitivity.

   In the invention according to claim 4 configured as described above, the light receiving surface of the detection device and the light emitting surface of the light source are disposed to face each other at an equal angle with respect to the front surface of the liquid crystal panel. It is possible to prevent the irradiation light irradiated from the surface from directly entering the light receiving surface with a simple configuration, and to detect the change in the amount of reflected light reflected by the liquid crystal panel with high sensitivity.

   In the invention according to claim 4 configured as described above, the irradiation light from the light source is bent by the half mirror to irradiate the front surface of the liquid crystal panel, and the reflected light reflected by the liquid crystal panel is the half mirror. Is incident on the light-receiving surface of the detection device, so that it is reliably prevented that the light emitted from the light source directly enters the light-receiving surface of the detection device, and the change in the amount of reflected light reflected by the liquid crystal panel is further increased. Sensitivity can be detected.

   Embodiments of a liquid crystal display device adjusting device according to the present invention will be described below with reference to the drawings. As shown in FIG. 2, the liquid crystal display device 10 in which the potential of the common electrode is adjusted by the adjusting device includes a glass substrate 11, a liquid crystal panel 12 provided in the center of the glass substrate 11, and an edge portion of the glass substrate 11. The driving IC chip 13 and the FPC (Flexible Printed Circuit) 14 are bonded to each other. The FPC 14 is an electronic circuit formed on a transparent or semi-transparent flexible substrate, and the opaque electrode portion has a transparent electrode portion of the glass substrate 11 with an anisotropic conductive film such as an ACF (Anisotropic Conductive Film) tape interposed therebetween. It is crimped to.

   For example, as shown in FIG. 3, the liquid crystal panel 12 is filled with liquid crystal 15 via an alignment film between the upper and lower glass substrates 11a and 11b, and a plurality of color filters 16 are interposed on the lower surface of the upper glass substrate 11a. Transparent Y electrodes 17 are provided in the vertical direction, a plurality of X electrodes 18 are provided in the horizontal direction on the upper surface of the lower glass substrate 11b, and the liquid crystal 15 is divided into a plurality of pixels in a matrix. Polarizing filters 19a and 19b are provided on the upper and lower surfaces of the upper and lower glass substrates 11a and 11b. As shown in FIG. 4, the X electrode 18 is provided with a reflective portion 46 and a transmissive portion 47 corresponding to each pixel 45, and the reflective portion 46 is made of an aluminum electrode. Each Y electrode and each X electrode 17, 18 are connected to the drive IC chip 13, and the drive IC chip 13 is connected to the FPC 14. By the operation of the driving IC chip 13, the X electrodes of the liquid crystal panel 12 are sequentially connected to the common electrode, the positive and negative control voltages are sequentially applied to the Y electrode 17 for each frame, the X electrode 18 connected to the common electrode, A pixel intersecting with the Y electrode 17 to which a voltage is applied enters a light-transmitting state. Thereby, when the liquid crystal panel 12 is irradiated by the light source from the front surface, that is, the upper glass substrate 11a side, the irradiated light is reflected by the reflection portion of the X electrode and emitted from the front surface of the liquid crystal panel 12 in the translucent pixel. The

   There are two types of liquid crystal panels, normal black and normal white. In a normal white liquid crystal panel, pixels where the X electrode connected to the common electrode and the Y electrode to which the voltage is applied cross are opaque. It becomes a state. Further, when the liquid crystal panel 12 is illuminated by the backlight from the back surface, that is, the lower glass substrate 11b side, the irradiated light passes through the transmission part of the X electrode and is emitted from the front surface of the liquid crystal panel 12 in the translucent pixel. To do.

   As shown in FIG. 1, the adjustment device 20 for a liquid crystal display device includes a light source device 21 for irradiating the front surface of the liquid crystal panel 12 of the liquid crystal display device 10 in a state before mounting a backlight, and a light receiving surface 22a having a liquid crystal. A photo sensor 22 as a detection device that faces the front surface of the panel 12 and receives light reflected from the liquid crystal panel 12, and the liquid crystal display device 10 so that flicker is minimized based on the amount of reflected light detected by the photo sensor 22. A main body 29 having a potential adjusting unit 23 for adjusting the potential of the common electrode is provided. The light source device 21 includes a light source 34 that irradiates the front surface of the liquid crystal panel 12 of the liquid crystal display device 10 with irradiation light from a light emission surface 34a. As the light source 34, it is preferable to use a white LED that emits light having a wavelength with high sensitivity of the photosensor 22.

   In the liquid crystal display device 10 with the backlight attached, the light source device 21 irradiates the front surface of the liquid crystal panel 12 without illuminating the backlight, and from the liquid crystal panel 12 detected by the photosensor 22. The common electrode of the liquid crystal display device 10 may be adjusted based on the amount of reflected light so that the flicker is minimized.

   The jig portion 24 of the adjustment device 20 for the liquid crystal display device is provided with an FPC 25 having electrodes that are in contact with and electrically connected to the electrodes of the FPC 14 of the liquid crystal display device 10. The liquid crystal display device 10 is positioned and placed on the jig portion 24 so that the electrodes of the FPCs 14 and 25 are in contact with each other, and the FPC 25 is elastically pressed against the FPC 14 by the clamp device 26 and connected to the potential adjusting portion 23. . The potential adjusting unit 23 and the jig unit 24 are electrically connected by a cable 27.

   When adjusting the potential of the common electrode of the liquid crystal display device 10, the light source device 21 and the photo sensor 22 are arranged on the ceiling in order to irradiate the front surface of the liquid crystal panel 12 of the liquid crystal display device 10 attached to the jig unit 24. The attached box-shaped cover 28 is placed on the liquid crystal display device 10 so as to cover the front surface of the liquid crystal panel 12. The cover 28 is formed of a black light shielding member so that light does not enter from the outside into the box-shaped interior.

   The light source device 21 includes a direct incident preventing unit 43 that prevents incident light from directly entering the light receiving surface 22 a of the photosensor 22. That is, as a configuration for preventing the light irradiated from the light emitting surface 34 a of the light source 34 from directly entering the light receiving surface 22 a of the photosensor 22, the light emitting surface 34 a faces the front surface of the liquid crystal panel 12 in a substantially parallel state. As described above, the light source 34 is attached to the ceiling of the cover 28 at the side of the photosensor 22, and the light receiving surface 22a is opposed to the central front surface of the liquid crystal panel 12 at a position closer to the light emitting surface 34a. A photosensor 22 is attached to the ceiling of the cover 28. As the light source 34 in this case, when the light source 34 and the photo sensor 22 are attached to the ceiling of the cover 28, the thin surface mounting is performed such that the light emitting surface 34a faces the front surface of the liquid crystal panel 12 at a position farther from the light receiving surface 22a. It is preferable to use LEDs.

   In addition, as shown in FIG. 6, the direct incident preventing means 43 has a light guide plate 53 having a light guide property having a grad joined to the light guide surface 22a of the photosensor 22, and the light receiving surface 22a of the photosensor 22 is connected to the light guide plate. The light receiving surface 22a of the photosensor 22 may be opposed to the central front surface of the liquid crystal panel 12 at a position closer to the light emitting surface 34a by being equivalent to lowering to the lower surface 53a of 53. Further, as shown in FIG. 7, the photosensor 22 is attached to the ceiling of the cover 28 via a spacer 54 having a lead terminal, so that the light receiving surface 22a is closer to the front surface of the liquid crystal panel 12 and the light emitting surface 34a. It is good also as a structure which opposes.

   The potential adjusting unit 23 generates a video signal and sends the video signal to the driving IC chip 13 of the liquid crystal display device 10 in order to display an image suitable for flicker detection on the liquid crystal panel 12, and a photo sensor. The signal output unit 31 that processes the detection signal from the signal 22 and outputs a signal corresponding to the size of the flicker, and the drive IC chip 13 so as to continuously change the common potential applied to the common electrode of the liquid crystal display device 10. Based on the command unit 32 commanded and the common potential commanded to the drive IC chip 13 by the command unit 32 and the signal output from the signal output unit 31 at that time, the common potential when the flicker is minimized is set to the drive IC. A potential setting unit 33 or the like to be set on the chip 13 is provided. The command unit 32 commands the drive IC chip 13 to continuously change the common potential applied to the common electrode of the liquid crystal display device 10 every time a rotation signal of the scroll 52 is input from the mouse 50.

   Next, the operation of the liquid crystal display device adjusting apparatus 20 according to the above embodiment will be described. The liquid crystal display device 10 in which the potential of the common electrode is adjusted is positioned and mounted on the jig portion 24, the FPC 25 is pressed against the FPC 14 by the clamp device 26, and the liquid crystal display device 10 is connected to the main body portion 29. When the left button 51 of the mouse 50 is pressed for a long time, the command unit 32 turns on the power switch of the liquid crystal display device 10. A cover 28 is placed on the liquid crystal display device 10 so as to cover the front surface of the liquid crystal panel 12.

   When the left button 51 of the mouse 50 is clicked (left click), the command unit 32 activates the potential adjustment unit 23 and causes the light source 34 to emit light and irradiate the front surface of the liquid crystal panel 12 with irradiation light. At this time, the light source 34 faces the front surface of the liquid crystal panel 12 with the light emitting surface 34a substantially parallel to the front surface of the liquid crystal panel 12, and irradiates the front surface of the liquid crystal panel 12. Since it faces the front surface of the liquid crystal panel 12 at a position close to the liquid crystal panel 12, the light irradiated from the light emitting surface 34 a of the light source 34 is prevented from directly entering the light receiving surface of the photosensor 22. can do. Since the front surface of the liquid crystal panel 12 is covered with the cover 28 and the front surface of the liquid crystal panel 12 is irradiated with the irradiation light, the reflected light from the liquid crystal panel 12 blocks the light from the outside in the photo sensor. It is possible to detect the change of reflected light with high sensitivity.

   The command unit 32 sends a video signal generation command to the video signal generation unit 30, and the video signal generation unit 30 generates a video signal of a video suitable for flicker detection and supplies the FPC 25, FPC 25, to the drive IC chip 13 of the liquid crystal display device 10. 14 to send out. The driving IC chip 13 sequentially connects the X electrode 18 of the liquid crystal panel 12 to the common electrode in one frame period in accordance with the video signal, and sequentially applies a control voltage to the Y electrode 17 in one horizontal period, thereby liquidating the image. Display on the panel 12. At this time, the pixel where the X electrode 18 connected to the common electrode and the Y electrode 17 to which the voltage is applied crosses is in a translucent state, and the irradiation light incident on the liquid crystal panel 12 is reflected by the reflection part of the X electrode 18. In the pixel corresponding to the Y electrode 17 that is reflected and brightened, the irradiation light does not reach the reflecting portion of the X electrode 18 and is not reflected, and thus becomes black. The control voltage applied to the Y electrode 17 is an alternating voltage that alternates between positive and negative for each frame. Therefore, if the positive and negative control voltages are different, the brightness of the screen is different for each frame and flicker occurs. Arise. This flicker can be reduced by adjusting the common potential of the common electrodes to which the X electrodes 18 are sequentially connected.

   Each time the rotation signal of the scroll 52 is input from the mouse 50 to the command unit 32, the command unit 32 inputs the signal to the common potential setting terminal of the drive IC chip 13, and the common potential of the drive IC chip 13 is changed every time a signal is input. Is displaced. Since one frame period is sufficiently smaller than the interval of signals input from the command unit 32, the magnitude of flicker at each common potential when each signal is input can be detected.

   The signal output unit 31 converts a detection current corresponding to the amount of light reflected from the liquid crystal panel 12 output from the photosensor 22 into a voltage using a current / voltage conversion circuit. When an image with flicker is detected by the photosensor 22, the output of the current / voltage conversion circuit becomes a detection voltage 35 that changes slightly according to flicker as shown in FIG. The DC voltage is removed from the detection voltage 35 by the AC regeneration circuit to become the waveform voltage 36 shown in FIG. 5B, and the amplified voltage is amplified by the amplification circuit like the amplified waveform voltage 37 in FIG. 5C. The signal output unit 31 detects a difference value between the maximum peak value and the minimum peak value (Peak to Peak) for each frame period with respect to the amplified waveform voltage 37 by a peak value hold circuit, and the difference value is determined according to the flicker size. Output as a signal. The potential setting unit 33 sequentially stores the difference value for each frame period, and the difference value for each frame period in each common potential set in the drive IC chip 13 by each signal continuously sent from the mouse 50. The common voltage when the difference value is minimized is set in the common potential setting unit of the drive IC chip 13.

   In the above embodiment, the direct incident preventing means 43 for preventing the incident light from directly entering the light receiving surface 22a of the photosensor 22 is such that the light emitting surface 34a faces the front surface of the liquid crystal panel 12, and the light receiving surface 22a is the light emitting surface. Although the light source 34 and the photosensor 22 are configured to be attached to the ceiling of the cover 28 so as to face the front surface of the central portion of the liquid crystal panel 12 at a position closer to 34a, the present invention is not limited to this.

  As shown in FIG. 8, the direct incident preventing means 43 has a photosensor 22 attached to the ceiling of the cover 28 so that the light receiving surface 22a faces the front surface of the central portion of the liquid crystal panel 12 in a substantially parallel state. A configuration in which the light source 34 is attached to the ceiling of the cover 28 on the side of the photosensor 22 so that 34a faces the liquid crystal panel 12 at a position closer to the liquid crystal panel 12 than the light receiving surface 22a. As the light source 34 in this case, when the light source 34 and the photosensor 22 are attached to the ceiling of the cover 28, a cannonball type so that the light emitting surface 34 a faces the front surface of the liquid crystal panel 12 at a position closer to the light receiving surface 22 a. It is preferable to use a tall LED or lead terminal type.

   According to this, the light source 34 faces the front surface of the liquid crystal panel 12 in a substantially parallel state at a position closer to the front surface of the liquid crystal panel 12 and irradiates the front surface of the liquid crystal panel 12. Since the light receiving surface 22a faces the front surface of the liquid crystal panel 12 in a substantially parallel state, it is possible to prevent the irradiation light emitted from the light emitting surface 34a of the light source 34 from directly entering the light receiving surface of the photosensor 22. it can. Since the front surface of the liquid crystal panel 12 is covered with the cover 28 and the front surface of the liquid crystal panel 12 is irradiated with the irradiation light, the reflected light from the liquid crystal panel 12 blocks the light from the outside in the photo sensor. It is possible to detect the change of reflected light with high sensitivity.

   Further, as shown in FIG. 9, the direct incident preventing means 43 is equivalent to the case where the light guide plate 55 is joined to the light emitting surface 34 a of the light source 34 and the light emitting surface 34 a of the light source 34 is lowered to the lower surface 55 a of the light guide plate 55. Thus, the light-emitting surface 34a of the light source 34 may be configured to face the front surface of the liquid crystal panel 12 in a substantially parallel state at a position closer to the light-receiving surface 22a. Further, as shown in FIG. 10, the light source 34 may be attached to the ceiling of the cover 28 via the spacer 56, so that the light emitting surface 34a faces the front surface of the liquid crystal panel 12 at a position closer to the light receiving surface 22a. .

   Furthermore, as shown in FIG. 11, the direct incident preventing means 43 may be configured such that a light blocking body 57 is disposed between the light emitting surface 34 a of the light source 34 and the light receiving surface 22 a of the photosensor 22. According to this, the irradiation light which goes to the light-receiving surface 22a of the photosensor 22 from the light-emitting surface 34a of the light source 34 is interrupted | blocked by the light-shielding body 57, and it prevents that irradiation light directly injects into the light-receiving surface 22a.

   As shown in FIG. 12, the direct incident preventing means 43 includes an optical axis 22b perpendicular to the light receiving surface 22a of the photosensor 22 and an optical axis 34b perpendicular to the light emitting surface 34 of the light source 34 on the front surface of the liquid crystal panel 12. The light receiving surface 22a and the light emitting surface 34a may be arranged to face the front surface of the liquid crystal panel 12 while being inclined at an equal angle with respect to the normal line 12a.

   According to this, it is possible to prevent the irradiation light irradiated from the light emitting surface 34a from directly entering the light receiving surface 22a of the photosensor 22 with a simple configuration and to be reflected by the liquid crystal panel 12 to receive the light receiving surface 22a. Therefore, the change in the amount of reflected light reflected by the liquid crystal panel can be detected with high sensitivity.

   Further, as shown in FIG. 13, the direct incident preventing unit 43 is configured such that the irradiation light from the light source 34 is bent by the half mirror 58 to irradiate the front surface of the liquid crystal panel 12, and the irradiation light is reflected by the liquid crystal panel 12. The reflected light may pass through the half mirror 58 and enter the light receiving surface 22a of the photosensor 22. According to this, it is possible to reliably prevent the irradiation light from the light source 34 from directly entering the light receiving surface 22 a of the photosensor 22, and the irradiation light incident on the liquid crystal panel 12 is reflected by the reflection portion of the X electrode 18. A change in the amount of reflected light can be detected with higher sensitivity.

   As the light source 34 of the light source device 21, as shown in FIG. 14, an annular light guide 40 is arranged around the photosensor 22, and light emitted from the light emitting diodes 41 is emitted to the light guide 40 at a plurality of locations on the outer peripheral surface. For example, it is good also as a structure which introduce | transduces from two places away in the diameter direction and makes the light guide 40 light-emit. According to this, since the light guide 40 disposed around the photosensor 22 emits light by the light from the light emitting diode 41, the reflected light from the liquid crystal panel 12 enters the light receiving surface of the photosensor 22 from the periphery. The reflected light is not uneven, and the change in the amount of reflected light can be detected with high accuracy. The light emitter that emits light from the light guide 40 is not limited to the light emitting diode 41, and may be a light emitter whose light amount is controlled by current, such as a fluorescent lamp, an incandescent lamp, and a halogen lamp.

   Further, the detection device is not limited to a photo sensor, and a CCD camera, a CMOS camera, or the like may be used.

The figure which shows embodiment of the adjustment apparatus for liquid crystal display devices which concerns on this invention. FIG. 11 illustrates a liquid crystal display device. Sectional drawing of a liquid crystal panel. The figure which shows X electrode of each pixel. The figure which shows the signal of each step which processed the output current from a photosensor. The figure which shows the direct-injection prevention means of the structure which made the light-receiving plate oppose the front surface of a liquid crystal panel in the position close | similar to the light emission surface of a light source with a light-guide plate. The figure which shows the direct-injection prevention means of the structure which made the light-receiving surface of a photosensor oppose the front surface of a liquid crystal panel in the position near the light emission surface of a light source with a spacer. The figure which shows the direct incident prevention means of the structure which opposes the front surface of a liquid crystal panel in the position where the light emission surface of a light source is near the light-receiving surface of a photosensor. The figure which shows the direct-injection prevention means of the structure which made the light-projection surface oppose the front surface of a liquid crystal panel in the position close | similar to the light-receiving surface of a photosensor with the light-guide plate. The figure which shows the direct-injection prevention means of the structure which made the light emission surface of a light source oppose the front surface of a liquid crystal panel in the position near the light-receiving surface of a photosensor with a spacer. The figure which shows the example which has arrange | positioned the light-shielding body between the light source and the photosensor. The figure which shows the direct-injection prevention means of the structure which inclined the light-receiving surface of the photosensor, and the light emission surface of the light source at equal angle with respect to the front surface of a liquid crystal panel. The figure which shows the direct-injection prevention means using a half mirror. The figure which shows the light source comprised by the light emitting diode and the light guide.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device 11, 11a, 11b ... Glass substrate, 12 ... Liquid crystal panel, 12a ... Normal of the front surface of a liquid crystal panel, 13 ... Drive IC chip, 14, 25 ... FPC, 15 ... Liquid crystal, 17 ... Y electrode , 18 ... X electrode, 20 ... Adjustment device for liquid crystal display device, 21 ... Light source device, 22 ... Photo sensor (detection device), 22a ... Light receiving surface, 22b ... Optical axis, 23 ... Potential adjustment unit, 24 ... Jig part DESCRIPTION OF SYMBOLS 26 ... Clamping device, 28 ... Cover, 30 ... Video signal generation part, 31 ... Signal processing part, 32 ... Command part, 33 ... Electric potential setting part, 34 ... Light source, 34a ... Light emission surface, 34b ... Optical axis, 40 ... Guide Light body 41... Light emitting diode 45. Pixel 46 46 Reflector 47. Transmitter 48. Light shield 50. Mouse 51. Left button 53 and 55 Light guide plate 54 and 56 Spacer 57 ... light-shielding body, 58 ... half mirror .

Claims (5)

A light source device including a light source that irradiates irradiation light from a light emitting surface to a front surface of a liquid crystal panel of a liquid crystal display device, and a front surface of the liquid crystal panel so that reflected light reflected by the liquid crystal panel is incident on the irradiation light. An adjustment device for a liquid crystal display device provided with a detection device arranged in this manner and means for adjusting the potential of the common electrode of the liquid crystal display device so as to minimize flicker based on the amount of reflected light detected by the detection device In
The liquid crystal display device adjusting device according to claim 1, wherein the light source device includes direct incident preventing means for preventing the irradiation light from directly entering the light receiving surface of the detection device. 2. The direct incident prevention unit according to claim 1, wherein the light receiving surface of the detection device is arranged to face the front surface of the liquid crystal panel, and the light emission surface of the light source faces the front surface of the liquid crystal panel. An adjustment device for a liquid crystal display device, characterized in that the adjustment device is arranged on the side. 2. The direct incident preventing means according to claim 1, wherein the direct incident preventing means is a light shielding body that is disposed between the light source and the detection device and prevents the irradiation light from directly entering the light receiving surface of the detection device. An adjustment device for a liquid crystal display device. 2. The direct incidence preventing means according to claim 1, wherein the optical axis perpendicular to the light receiving surface of the detection device and the optical axis perpendicular to the light emitting surface of the light source are inclined at an equal angle with respect to the normal line of the front surface of the liquid crystal panel. An adjustment device for a liquid crystal display device, characterized in that the light receiving surface and the light emitting surface are arranged so as to face the front surface of the liquid crystal panel. 2. The direct incident preventing means according to claim 1, wherein irradiation light from the light source is bent by a half mirror to irradiate the front surface of the liquid crystal panel, and reflected light reflected by the liquid crystal panel is reflected by the half light. An adjustment device for a liquid crystal display device, wherein the adjustment device is configured to pass through a mirror and to be incident on a light receiving surface of the detection device.

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