JP4802822B2 - Liquid crystal display device and video display device - Google Patents

Description

  The present invention relates to a liquid crystal display device and a video display device. Specifically, the present invention relates to a liquid crystal display device and a video display device having a liquid crystal panel that can suppress deterioration of display characteristics in the liquid crystal panel.

  As shown in FIG. 4, the liquid crystal panel constituting the liquid crystal display device is configured by sandwiching a liquid crystal layer 203 between a first substrate 201 and a second substrate 202 which are arranged facing each other. An electrode 204 is provided on the opposite surface side of the pixel region (effective pixel region) indicated by reference numeral A of the substrate and on the entire opposite surface side of the second substrate. The electrodes are covered with alignment films 205 and 206, respectively, and the alignment state of the liquid crystal molecules contained in the liquid crystal layer is controlled by these alignment films. Further, the space between the first substrate and the second substrate is sealed with a sealant 207 provided in the peripheral region of the pixel region (the region indicated by reference numeral B, hereinafter simply referred to as “peripheral region”). Thus, the liquid crystal layer is filled and sealed between the first substrate and the second substrate.

  Here, in the liquid crystal panel configured as described above, it is known that the ionic impurity I dissolves from the sealant when liquid crystal is injected or driven thereafter, and the display characteristics of the liquid crystal panel are deteriorated. It has also been known that the start time of occurrence of this deterioration depends on the distance from the sealant to the pixel region.

Therefore, display devices having various configurations for the purpose of suppressing such deterioration of display characteristics have been proposed.
For example, in Patent Document 1, by using surface modification by ultraviolet irradiation, the surface energy of the alignment film located in the peripheral region is made higher than the surface energy of the alignment film in the pixel region located in the center of the liquid crystal panel. By setting, a display device has been proposed in which the ionic impurities dissolved from the sealing agent are adsorbed and captured in the alignment film portion in the peripheral region having a high surface energy, and the diffusion of the ionic impurities to the pixel region is suppressed. Patent Document 2 proposes a display device that suppresses diffusion of ionic impurities to the pixel region in the same manner as Patent Document 1 by providing an alignment film having high ion adsorptivity in the peripheral region. Further, Patent Document 3 proposes a display device in which the ability to adsorb and capture ionic impurities dissolved from the sealant is improved in an ion adsorption portion provided between the sealant and the pixel region.

JP-A-10-260406 JP-A-7-110479 Japanese Patent Laid-Open No. 2005-283693

  By the way, although it is ideal that no impurities are mixed in the liquid crystal layer filled and sealed between the first substrate and the second substrate, in reality, in the process until the liquid crystal layer is filled and sealed. It was considered that ionic impurities were mixed in the liquid crystal layer, and the knowledge that the ionic impurities mixed in the liquid crystal layer also caused display deterioration of the liquid crystal panel was obtained.

  For example, ionic impurities stay in the boundary region between the pixel region and the peripheral region because the drive voltage is applied to the pixel region but no drive voltage is applied to the peripheral region. This may cause display deterioration of the liquid crystal panel. Further, for example, the pixel region of the first substrate is provided with an electrode in the pixel region of the first substrate, but the electrode is not provided in the peripheral region of the first substrate. It is conceivable that a level difference (a level indicated by a symbol C in FIG. 4) is generated between the peripheral area and the surrounding area. When such a level difference occurs, ionic impurities stay in the level difference and the display of the liquid crystal panel is deteriorated. It is possible to invite.

  The present invention was devised in view of the above points, and a liquid crystal display device capable of improving display characteristics by moving ionic impurities mixed in a liquid crystal layer to a peripheral region and An object of the present invention is to provide a video display device.

  In order to achieve the above object, a liquid crystal display device according to the present invention includes a transparent substrate, a drive circuit substrate disposed facing the transparent substrate via a predetermined gap, the transparent substrate, and the drive circuit substrate. In a liquid crystal display device including a liquid crystal layer held in a gap, the transparent substrate has a common electrode provided in a pixel region and a peripheral region, and the drive circuit substrate is provided in a pixel region provided in the pixel region. The electrode has a peripheral region electrode provided in the peripheral region, and the voltage value of the drive voltage applied to the peripheral region electrode is higher than the voltage value of the drive voltage applied to the pixel region electrode.

Here, when the voltage value of the driving voltage applied to the peripheral region electrode is higher than the voltage value of the driving voltage applied to the pixel region electrode, ionic impurities mixed in the liquid crystal layer are removed from the pixel region to the peripheral region. This improves the ability to move to (sweeping ability) and effectively discharges ionic impurities from the pixel region to the peripheral region.
Hereinafter, this point will be described in detail.

  One of the display deteriorations of the liquid crystal panel caused by the retention of ionic impurities is a stain. The “total area where the stain has occurred” in the pixel region of the liquid crystal panel and the “drive voltage voltage” applied to the pixel region. The relationship with “value” is shown in FIG. In the graph shown in FIG. 5A, a driving voltage having a driving frequency of 60 Hz is applied to the pixel region electrode formed in the pixel region, and the driving voltage is applied to the peripheral region electrode formed in the peripheral region. 5 represents the relationship between the voltage value of the drive voltage applied to the pixel region electrode and the total area of the stain when the drive voltage is not applied, and the symbol X in FIG. 5A indicates that when the drive voltage is applied for 1 hour, FIG. ) The middle symbol Y represents the case where the drive voltage is applied for 2 hours. One pixel here is 16 μm square.

  From FIG. 5A, it can be seen that the total spot area increases as the drive voltage becomes higher. Here, since the total area of the stain can be considered to be the movement speed of the stain substance, it can be seen that the movement speed of the stain substance is improved as the driving voltage becomes higher. Therefore, since it is considered that the moving speed of the ionic impurities increases as the driving voltage becomes higher, the voltage value of the driving voltage applied to the peripheral region electrode is the same as the voltage value of the driving voltage applied to the pixel region electrode. In other words, the ionic impurities can be effectively discharged from the pixel region to the peripheral region by making the movement rate of the ionic impurity in the peripheral region higher than that of the ionic impurity in the pixel region. Is possible.

  In addition, the liquid crystal display device according to the present invention includes a transparent substrate, a drive circuit substrate disposed facing the transparent substrate via a predetermined gap, and a liquid crystal held in the gap between the transparent substrate and the drive circuit substrate. The transparent substrate includes a common electrode provided in a pixel region and a peripheral region, and the drive circuit substrate is provided in a pixel region electrode provided in the pixel region and the peripheral region. The frequency of the drive voltage applied to the peripheral region electrode is higher than the frequency of the drive voltage applied to the pixel region electrode.

Here, when the frequency of the drive voltage applied to the peripheral region electrode is higher than the frequency of the drive voltage applied to the pixel region electrode, the ionic impurities mixed in the liquid crystal layer are moved from the pixel region to the peripheral region. Therefore, the ionic impurities can be effectively discharged from the pixel region to the peripheral region.
Hereinafter, this point will be described in detail.

  First, a drive voltage having a voltage value of 5 V and a drive frequency of 60 Hz is applied to the pixel region electrode formed in the pixel region, and no drive voltage is applied to the peripheral region electrode formed in the peripheral region. When the driving voltage having a voltage value of 5 V is applied to the pixel region electrode and the peripheral region electrode for 15 hours, the stain moving pixel from the initial state (stain moving distance) 5) and the frequency of the drive voltage applied to the pixel region electrode and the peripheral region electrode are shown in FIG. One pixel here is 16 μm square.

  FIG. 5B shows that the spot moving pixel (spot moving distance) increases as the drive voltage becomes higher in frequency. Here, since the stain moving pixel (stain moving distance) can be considered as the moving speed of the stain substance, the moving speed of the ionic impurity is improved as the driving voltage becomes high frequency. I understand. Therefore, since it is considered that the moving speed of ionic impurities increases as the driving voltage becomes higher, the frequency of the driving voltage applied to the peripheral region electrode is higher than the frequency of the driving voltage applied to the pixel region electrode. It is possible to effectively discharge ionic impurities from the pixel region to the peripheral region by being high, that is, by making the movement rate of the ionic impurity in the peripheral region higher than the movement rate of the ionic impurity in the pixel region. It becomes.

  In order to achieve the above object, an image display device according to the present invention includes a transparent substrate, a drive circuit substrate disposed facing the transparent substrate via a predetermined gap, the transparent substrate, and the drive circuit. A liquid crystal display device having a liquid crystal layer held in a gap between the substrates, and performing video display using light modulated by the liquid crystal display device, wherein the transparent substrate includes a pixel region and a peripheral region The drive circuit substrate includes a pixel region electrode provided in a pixel region and a peripheral region electrode provided in a peripheral region, and a driving voltage applied to the peripheral region electrode Is higher than the voltage value of the drive voltage applied to the pixel region electrode.

  Here, when the voltage value of the driving voltage applied to the peripheral region electrode is higher than the voltage value of the driving voltage applied to the pixel region electrode, ionic impurities mixed in the liquid crystal layer are removed from the pixel region to the peripheral region. This improves the ability to move to (sweeping ability) and effectively discharges ionic impurities from the pixel region to the peripheral region.

  In addition, the video display device according to the present invention includes a transparent substrate, a drive circuit substrate disposed facing the transparent substrate via a predetermined gap, and a liquid crystal held in the gap between the transparent substrate and the drive circuit substrate. In the video display device that performs video display using light modulated by the liquid crystal display device, the transparent substrate has a common electrode provided in the pixel region and the peripheral region. The drive circuit board has a pixel region electrode provided in the pixel region and a peripheral region electrode provided in the peripheral region, and the frequency of the drive voltage applied to the peripheral region electrode is applied to the pixel region electrode. It is higher than the frequency of the drive voltage to be applied.

  Here, when the frequency of the drive voltage applied to the peripheral region electrode is higher than the frequency of the drive voltage applied to the pixel region electrode, the ionic impurities mixed in the liquid crystal layer are moved from the pixel region to the peripheral region. Therefore, the ionic impurities can be effectively discharged from the pixel region to the peripheral region.

  In the liquid crystal display device and the video display device to which the present invention is applied, ionic impurities mixed in the liquid crystal layer can be moved to the peripheral region, and display characteristics can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.
FIG. 1 is a schematic view for explaining a liquid crystal panel portion in a liquid crystal display device to which the present invention is applied. The liquid crystal panel 1 shown here includes a transparent substrate 2 and a drive circuit substrate 3 which are arranged facing each other, and these transparent substrates. A liquid crystal layer 4 formed by injecting liquid crystal between the substrate and the drive circuit substrate, and a sealant 5 for sealing the edge between the transparent substrate and the drive circuit substrate are provided.

Here, the transparent substrate is made of, for example, a glass substrate, and a transparent electrode 6 having optical transparency is formed over the entire surface on the opposite surface of the glass substrate. This transparent electrode is made of a transparent conductive material such as ITO (Indium-Tin Oxide), which is a solid solution material of tin oxide (SnO ₂ ) and indium oxide (In ₂ O ₃ ), and is common to the pixel region and the peripheral region. A large potential (for example, 7.5 V) is applied. The transparent electrode is an example of a common electrode.

  In addition, as shown in FIG. 2, the pixel region of the drive circuit substrate supplies a voltage to a liquid crystal layer, for example, a C-MOS (Complementary-Metal Oxide Semiconductor) type or an n-channel MOS type FET (Field Effect Transistor). A switching drive circuit 9 including a capacitor 8 serving as an auxiliary capacitor is arranged in a matrix for each pixel on a silicon substrate. A plurality of signal lines 10 electrically connected to the source electrodes of the FETs and scanning lines 11 electrically connected to the gate electrodes of the FETs are arranged on the silicon substrate in directions orthogonal to each other. It is formed with. Further, a signal driver (data driver) 13 for applying a display voltage to each signal line and a scanning driver 14 for applying a selection pulse to each scanning line are formed as a logic part in a peripheral region outside the pixel area. Yes. Note that the switching drive circuit is generally manufactured by a higher withstand voltage process than that of the logic portion because the transistor is required to have a withstand voltage corresponding to the drive voltage of the liquid crystal layer.

  Further, in the pixel region on the silicon substrate, a plurality of substantially rectangular reflective pixel electrodes 15 (an example of a pixel region electrode) electrically connected to the drain electrode of each FET are arranged in a matrix for each pixel. Has been. This reflective pixel electrode has a high reflectance in the visible region, for example, aluminum (Al), specifically, copper (Cu) or silicon (Si) used for wiring in the LSI process is added by several weight percent or less. It consists of a metal film mainly composed of aluminum (Al). This reflective pixel electrode has a function of reflecting light incident from the transparent substrate side and a function of applying a voltage to the liquid crystal layer. In order to further increase the reflectance, a multilayer film such as a dielectric mirror is used. May be laminated on the Al film. The reflective pixel electrode has a thickness of about 50 nm to 500 nm. Further, a peripheral region electrode 20 is formed in the peripheral region on the silicon substrate. The peripheral region electrode is formed by the same process as the reflective pixel electrode, and the material constituting the peripheral region electrode, the film thickness of the peripheral region electrode, and the like are the same as those of the reflective pixel electrode.

  And it is comprised so that the liquid-crystal layer mentioned later may interpose between a reflective pixel electrode and a peripheral area | region electrode, and a transparent electrode. In addition, alignment films 16 and 17 are formed on the opposing surfaces of the transparent substrate and the drive circuit substrate, which cover the transparent electrode and the reflective pixel electrode, respectively. In order to align the liquid crystal molecules in the liquid crystal layer in a predetermined direction, these alignment films are made of, for example, a polymer film such as polyimide whose surface is rubbed or an inorganic material such as silicon oxide (SiO) on the silicon substrate. On the other hand, it consists of an obliquely deposited film or the like deposited from an oblique direction.

  The liquid crystal layer is so-called vertical alignment liquid crystal in which nematic liquid crystal having negative dielectric anisotropy is vertically aligned by the alignment film described above. When a voltage is applied, the liquid crystal molecules tilt in a predetermined direction. Then, gradation display is performed by changing the light transmittance by the birefringence generated at that time.

  Here, the vertical alignment means a state in which the initial molecular alignment of the liquid crystal is aligned perpendicular to the substrate. However, when the liquid crystal molecules are perfectly vertically aligned, the application of voltage causes the liquid crystal molecules to tilt in random directions, resulting in uneven brightness. Therefore, in order to make the tilt direction of the liquid crystal molecules uniform, the pretilt angle for tilting the long axis of the liquid crystal molecules with respect to the normal line of the substrate is slightly in a certain direction (generally, the diagonal direction of the device). To be vertically aligned. On the other hand, if the pretilt angle is too large, the vertical alignment is deteriorated, the black level is increased and the contrast is lowered, or the VT (drive voltage-transmittance) curve is affected. Therefore, generally, the pretilt angle is controlled within an angle range of 1 ° to 7 °.

  The sealing agent is made of epoxy resin or the like. After an appropriate number of glass beads (not shown) are dispersed between the transparent substrate and the drive circuit substrate, the sealant is interposed between the alignment films with a thickness of about several μm. Is formed so as to be sealed. The seeding agent can also be formed so as to cover the side surfaces of these alignment films.

  By the way, in the above-described liquid crystal panel, the reflective pixel electrode takes a binary voltage value of 12.5 V as a high level (H level) and 2.5 V as a low level (L level), and a driving frequency is 60 Hz. A drive voltage of 1 is applied, a binary voltage value of 15 V as the H level and 0 V as the L level is applied to the peripheral region electrode, and a second drive voltage having a drive frequency of 70 Hz is applied.

  Here, since the ability to discharge ionic impurities contained in the liquid crystal layer from the pixel region to the peripheral region greatly depends on (1) the voltage value of the driving voltage and (2) the frequency of the driving voltage, Applying a drive voltage with a potential difference of 5 V to the transparent electrode to the peripheral region electrode and applying a drive voltage with a potential difference of 7.5 V to the transparent electrode to the reflective pixel electrode The voltage value of the driving voltage to be applied is made larger than the voltage value of the driving voltage applied to the reflective pixel voltage, a driving voltage having a driving frequency of 70 Hz is applied to the peripheral region electrode, and a driving frequency of 60 Hz is applied to the reflective pixel electrode. Although the drive voltage is applied so that the frequency of the drive voltage applied to the peripheral region electrode is larger than the frequency of the drive voltage applied to the reflective pixel electrode, You need not have peripheral region electrodes constructed as is higher than the reflective pixel electrode for both frequency and drive voltage.

  That is, even if the drive frequency of the drive voltage applied to the peripheral region electrode and the drive frequency of the drive voltage applied to the reflective pixel electrode are the same, the voltage value of the drive voltage applied to the peripheral region electrode is applied to the reflective pixel electrode. If the voltage value is higher than the driving voltage value, it is considered that the ability to discharge the ionic impurities contained in the liquid crystal layer from the pixel region to the peripheral region is improved, and the voltage value of the driving voltage applied to the peripheral region electrode and the reflective pixel Even if the voltage value of the drive voltage applied to the electrode is the same, it is included in the liquid crystal layer if the drive frequency of the drive voltage applied to the peripheral region electrode is higher than the drive frequency of the drive voltage applied to the reflective pixel electrode. Since it is considered that the ability to discharge ionic impurities from the pixel region to the peripheral region is improved, it is not always necessary for both the voltage value of the drive voltage and the frequency of the drive voltage. You need not have frequency electrodes constructed as is higher than the reflective pixel electrode.

  In the liquid crystal display device configured as described above, the voltage value of the drive voltage applied to the peripheral region electrode is made higher than the voltage value of the drive voltage applied to the reflective pixel electrode, and the drive voltage applied to the reflective pixel electrode is increased. By increasing the driving frequency applied to the peripheral region electrode higher than the driving frequency and improving the ionic impurity sweeping ability of the peripheral region rather than the pixel region, ionic impurities that contribute to display deterioration of the liquid crystal panel are removed from the pixel region. The liquid can be discharged to the outside, improving the reliability of the display quality of the liquid crystal panel.

  FIG. 3 is a schematic diagram for explaining a reflection type liquid crystal projector which is an example of an image display device to which the present invention is applied. The reflection type liquid crystal projector 100 shown here has red, green, and blue as a so-called three-plate system. A projection-type image display device that uses a reflective liquid crystal display device having the liquid crystal panel shown in FIG. 1 for three light valves corresponding to the three primary colors and displays a color image enlarged and projected on a screen (not shown). It is.

  Specifically, the reflective liquid crystal projector includes a lamp 101 that is a light source that emits illumination light, and separation that separates illumination light from the lamp into red light (R), green light (G), and blue light (B). The dichroic color separation filter 102 and the dichroic mirror 103 which are optical means, and an R light valve which is a light modulation means which modulates and reflects the separated red light (R), green light (G) and blue light (B). 104R, G light valve 104G and B light valve 104B, a combining prism 105 which is a combining optical means for combining the modulated red light (R), green light (G), and blue light (B), and combined illumination And a projection lens 106 as projection means for projecting light onto the screen.

  Here, the lamp emits white light including red light (R), green light (G), and blue light (B), and includes, for example, a halogen lamp, a metal halogen lamp, a xenon lamp, or the like.

  Further, in the optical path between the lamp and the dichroic color separation filter, the fly-eye lens 107 for making the illuminance distribution of the illumination light emitted from the lamp uniform, and the P and S polarization components of the illumination light as one polarization component A polarization conversion element 108 that converts (for example, an S-polarized component), a condenser lens 109 that collects illumination light, and the like are disposed.

  The dichroic color separation filter has a function of separating white light emitted from the lamp into blue light (B) and other color lights (R, G), and the separated blue light (B) and other color lights ( R, G) are reflected in opposite directions.

  Further, a total reflection mirror 110 that reflects the separated blue light (B) toward the B light valve is disposed between the dichroic color separation filter and the B light valve, and the dichroic color separation filter and the dichroic mirror A total reflection mirror 111 that reflects other separated color lights (R, G) toward the dichroic mirror is disposed between them.

  The dichroic mirror has a function of separating the other color light (R, G) into red light (R) and green light (G), and transmits the separated red light (R) toward the R light valve. The separated green light (G) is reflected toward the G light valve.

  Also, R, G, and B polarization beam splitters 112R, 112G, and 112B for guiding the separated color lights R, G, and B to the light valves are provided between the light valves 104R, 104G, and 104B and the combining prism. Has been placed. These R, G, and B polarization beam splitters have a function of separating each incident color light R, G, and B into a P polarization component and an S polarization component, and one polarization component (for example, an S polarization component) is converted into R, The light is reflected toward the G and B light valves, and the other polarization component (for example, P polarization component) is transmitted toward the synthesis prism.

  The R, G, and B light valves are composed of a reflective liquid crystal display device having the liquid crystal panel shown in FIG. 1, and the light of one polarization component (for example, S polarization component) guided by each polarization beam splitter according to the video signal. Then, the polarization-modulated light is reflected toward each polarization beam splitter.

  The synthesizing prism is a so-called cross-cube prism, and has a function of synthesizing each color light R, G, B of the other polarization component (for example, P polarization component) that has passed through each polarization beam splitter, and projects the synthesized light. The light is emitted toward the lens.

  The projection lens has a function of enlarging and projecting light from the combining prism toward the screen.

  In the reflective liquid crystal projector configured as described above, white light emitted from the lamp is separated into red light (R), green light (G), and blue light (B) by the dichroic color separation filter and the dichroic mirror. . The separated red light (R), green light (G), and blue light (B) are S-polarized light components, and enter each light valve through each polarization beam splitter. The red light (R), green light (G), and blue light (B) incident on each light valve are polarized and modulated in accordance with the drive voltage applied to each pixel of each light valve, and then each polarized beam. Reflected towards the splitter. In the modulated red light (R), green light (G), and blue light (B), only the P-polarized component light passes through each polarization beam splitter and is synthesized by the synthesis prism. Light is magnified and projected on the screen by the projection lens.

  As described above, this reflection type liquid crystal projector performs color image display by enlarging and projecting an image corresponding to the light modulated by the light valve on the screen.

  By the way, as described above, the reflection type liquid crystal display device constituting each light valve can discharge ionic impurities that cause display deterioration of the liquid crystal panel to the outside of the pixel region. In this case, the display quality can be improved.

  In this embodiment, a projection type image display device that projects onto a screen like a reflection type projector has been described as an example. However, the present invention is a direct view type image in which a reflection type liquid crystal display device is directly viewed. The present invention can be widely applied to liquid crystal display devices.

It is a schematic diagram for demonstrating the liquid crystal panel part in the liquid crystal display device to which this invention is applied. It is a schematic diagram which shows the structure of a drive circuit board | substrate and a switching drive circuit. It is a schematic diagram for demonstrating the reflection type liquid crystal projector which is an example of the video display apparatus to which this invention is applied. It is a schematic diagram for demonstrating the conventional liquid crystal panel. It is a graph which shows the relationship between the stain total area and the voltage value of the drive voltage applied to the pixel region, and the relationship between the stain movement distance and the drive frequency of the drive voltage applied to the pixel region.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Transparent substrate 3 Drive circuit board 4 Liquid crystal 5 Sealant 6 Transparent electrode 7 FET
DESCRIPTION OF SYMBOLS 8 Capacitor 9 Switching drive circuit 10 Signal line 11 Scan line 13 Signal driver 14 Scan driver 15 Reflection pixel electrode 16, 17 Orientation film | membrane 20 Peripheral area electrode 100 Reflective liquid crystal projector 101 Lamp 102 Color separation filter 103 Dichroic mirror 104R R Light valve 104G G light valve 104B B light valve 105 Synthetic prism 106 Projection lens 107 Fly eye lens 108 Polarization conversion element 109 Condenser lens 110, 111 Total reflection mirror 112 Polarization beam splitter

Claims (3)

A transparent substrate;
A drive circuit board disposed facing the transparent substrate via a predetermined gap;
In a liquid crystal display device comprising a liquid crystal layer held in a gap between the transparent substrate and the drive circuit substrate,
The transparent substrate has a common electrode provided in a pixel region and a peripheral region,
The drive circuit substrate has a pixel region electrode provided in the pixel region, and a peripheral region electrode provided in the peripheral region,
The liquid crystal display device, wherein a frequency of a driving voltage applied to the peripheral region electrode is higher than a frequency of a driving voltage applied to the pixel region electrode. A transparent substrate;
A drive circuit board disposed facing the transparent substrate via a predetermined gap;
In a liquid crystal display device comprising a liquid crystal layer held in a gap between the transparent substrate and the drive circuit substrate,
The transparent substrate has a common electrode provided in a pixel region and a peripheral region,
The drive circuit substrate has a pixel region electrode provided in the pixel region, and a peripheral region electrode provided in the peripheral region,
The voltage value of the drive voltage to be applied to the peripheral area electrodes, rather higher than the voltage value of the drive voltage applied to the pixel area electrode,
Frequency of the drive voltage to be applied to the peripheral region electrode, a liquid crystal display comprising a high Ikoto than the frequency of the drive voltage applied to the pixel area electrode. A liquid crystal display device comprising: a transparent substrate; a drive circuit substrate disposed opposite to the transparent substrate with a predetermined gap; and a liquid crystal layer held in the gap between the transparent substrate and the drive circuit substrate, In a video display device that performs video display using light modulated by a liquid crystal display device,
The transparent substrate has a common electrode provided in a pixel region and a peripheral region,
The drive circuit substrate has a pixel region electrode provided in the pixel region, and a peripheral region electrode provided in the peripheral region,
An image display device, wherein a frequency of a driving voltage applied to the peripheral region electrode is higher than a frequency of a driving voltage applied to the pixel region electrode.

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