WO2011058728A1 - Afficheur à cristaux liquides - Google Patents

Afficheur à cristaux liquides Download PDF

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Publication number
WO2011058728A1
WO2011058728A1 PCT/JP2010/006552 JP2010006552W WO2011058728A1 WO 2011058728 A1 WO2011058728 A1 WO 2011058728A1 JP 2010006552 W JP2010006552 W JP 2010006552W WO 2011058728 A1 WO2011058728 A1 WO 2011058728A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal display
light
display panel
backlight
Prior art date
Application number
PCT/JP2010/006552
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English (en)
Japanese (ja)
Inventor
式井　愼一
古屋　博之
愼一 門脇
Original Assignee
パナソニック株式会社
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Publication of WO2011058728A1 publication Critical patent/WO2011058728A1/fr

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    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
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    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/24—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type involving temporal multiplexing, e.g. using sequentially activated left and right shutters
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    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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Definitions

  • the present invention relates to a field sequential type liquid crystal display device.
  • the liquid crystal display device generally uses a fluorescent lamp such as a cold cathode fluorescent lamp (hereinafter referred to as “CCFL”) as a light source, and directly illuminates the liquid crystal display panel from the back side.
  • CCFL cold cathode fluorescent lamp
  • each pixel is composed of sub-pixels composed of red, blue, and green color filters.
  • red Light can pass through the red sub-pixel, but the blue and green sub-pixels are absorbed by the color filters and do not contribute to image formation and are lost.
  • the same can be said for blue light and green light, so that 2/3 of the light emitted from the CCFL is absorbed and lost in the sub-pixels of the liquid crystal display panel.
  • a liquid crystal display device includes a liquid crystal display panel having a plurality of pixels and displaying an image corresponding to input image data, and applying the voltage to the liquid crystal display panel to apply the liquid crystal
  • a drive circuit that drives the display panel, a backlight that irradiates the liquid crystal display panel with light of a plurality of colors from the back surface, a drive control unit that controls the drive circuit, and control of light irradiation from the backlight
  • a backlight control unit that divides one frame into a plurality of subframes, and further subdivides each subframe into a plurality of fields respectively corresponding to the plurality of colors of light.
  • a backlight control unit for controlling, one frame is divided into a plurality of subframes, and each subframe is further divided into a plurality of fields respectively corresponding to the light of the plurality of colors, and in each field, the image Based on the data, the liquid crystal display panel is driven, and light of a color corresponding to the field is transmitted from the backlight to the liquid crystal display panel.
  • the liquid crystal display device forms the image by irradiating the liquid crystal display panel, and the liquid crystal display panel includes a liquid crystal layer inside and a transparent electrode for applying a voltage to the liquid crystal layer by the driving circuit.
  • the light emitted from the backlight includes infrared light or ultraviolet light
  • the transparent electrode is formed of a material that generates heat by absorbing infrared light or ultraviolet light.
  • FIG. 6 is an explanatory diagram of a liquid crystal response waveform and a light source lighting timing according to the first embodiment, in which (a) shows a case where zero is set at the end of each field, and (b) is continuously driven without being set to zero at the end of each field. Indicates when to do.
  • FIG. 3 is a control block diagram of the liquid crystal display device according to the first embodiment.
  • FIG. 7 is an explanatory diagram of scroll illumination of a liquid crystal display device according to a second embodiment, where (a) shows a cross-sectional view and a control block of the liquid crystal display device, and (b) shows liquid crystal drive timing and light source lighting timing.
  • FIG. 6 is an explanatory diagram of light source lighting timing with an adjacent illumination block of the liquid crystal display device according to the second embodiment.
  • FIG. 7 is a schematic configuration diagram of another liquid crystal display device according to the second exemplary embodiment, where (a) is a plan view of the liquid crystal display device and (b) is a side view of the liquid crystal display device as viewed from the direction of an arrow 21A.
  • FIG. 7 is a schematic configuration diagram of another liquid crystal display device according to the second exemplary embodiment, where (a) is a plan view of the liquid crystal display device and (b) is a side view of the liquid crystal display device as viewed from the direction of an arrow 21A.
  • FIG. 6 is a diagram when the liquid crystal display device according to the second embodiment is applied to three-dimensional display, in which (a) is a schematic configuration diagram, and (b) is an explanatory diagram of display timings of a right eye image and a left eye image.
  • FIG. 3 is a schematic configuration diagram of a liquid crystal display device according to a second embodiment, where (a) is a plan view of the liquid crystal display device, (b) is a side view of the liquid crystal display device viewed from the direction of an arrow 21A, and (c) is a laser light source.
  • the block diagram which shows the form provided with a superluminescent diode (SLD) instead of.
  • SLD superluminescent diode
  • FIG. 6 is a diagram illustrating a liquid crystal display device according to a fourth exemplary embodiment, where (a) is a schematic configuration diagram, (b) is a cross-sectional view taken along line 100A-100A in (a), and (c) is 100B-100B in (a). Sectional view with a line.
  • FIG. 6 is a diagram illustrating a drive circuit of a liquid crystal display device according to a fourth embodiment.
  • FIG. 10 is a diagram illustrating another drive circuit of the liquid crystal display device according to the fourth embodiment;
  • FIG. 17 is a diagram illustrating the control timing of each pixel of the liquid crystal display device according to the fourth embodiment, where (a) shows the case of the drive circuit shown in FIG. 16 and (b) shows the case of the drive circuit shown in FIG.
  • FIG. 1 is a schematic configuration diagram of a field sequential type liquid crystal display device.
  • 1A is a plan view of the liquid crystal display device
  • FIG. 1B is a cross-sectional view of the liquid crystal display device of FIG. 1A taken along the line 10A-10A.
  • FIG. 2 is a circuit configuration diagram of the liquid crystal display panel.
  • the liquid crystal display device 10 includes a liquid crystal display panel 11, a plurality of light sources 12 arranged on the side opposite to the viewing side of the liquid crystal display panel 11, that is, the back side, a reflection unit 13, a backlight control unit 141, and drive control.
  • the control part 14 which has the part 142, and the drive circuit 7 are provided.
  • the light source 12 includes a red light source 12r, a green light source 12g, and a blue light source 12b, and functions as a backlight with respect to the liquid crystal display panel 11 together with the reflection unit 13.
  • An LED can be used as the light source 12.
  • the red light source 12r, the green light source 12g, and the blue light source 12b constituting the light source 12 are alternately arranged between the liquid crystal display panel 11 and the reflection unit 13 so as to be uniform white by color mixing as shown in FIG. Deploy.
  • Each light source 12 is connected to a backlight control unit 141 of the control unit 14, and the backlight control unit 141 controls lighting, extinguishing timing, and light quantity of each light source 12.
  • the light emitted from each light source 12 and emitted in the direction opposite to the liquid crystal display panel 11 is also reflected by the reflection unit 13 so as to irradiate the liquid crystal display panel 11 uniformly without waste.
  • the liquid crystal display panel 11 is connected to the drive control unit 142 of the control unit 14 via the drive circuit 7, and the drive control unit 142 uses the liquid crystal of each pixel constituting the liquid crystal display panel 11 via the drive circuit 7.
  • the transmittance is controlled by applying a voltage to and driving.
  • signal lines DL1, DL2,..., DLm
  • scanning lines GL1, GL2,..., GLn
  • a subpixel is formed by connecting to the drain electrode and the gate electrode.
  • the source electrode is connected to a transparent electrode (not shown), and a voltage is applied to the liquid crystal having the capacitance Clc with the common electrode Vcom.
  • the signal lines DL1, DL2,..., DLm are connected to the source driver 15, and the scanning lines GL1, GL2,..., GLn are connected to the gate driver 16, and the gate driver 16 turns on the desired scanning line.
  • the voltage of each signal line is adjusted by the source driver 15 so that the liquid crystal of the subpixel connected to each signal line has a desired transmittance. Applied to both ends.
  • the gate driver 16 sequentially applies ON signals (scanning signals) to the scanning lines in order from the top (GL1, GL2,..., GLn), and the source driver 15 synchronizes with this. Since a desired voltage is applied to the signal line, the image displayed from the top to the bottom of the liquid crystal display panel 11 is updated.
  • the drive circuit 7 includes a source driver 15, a gate driver 16, a TFT, a signal line, a scanning line, a transparent electrode, a common electrode Vcom, and the like.
  • FIG. 3 is an explanatory diagram of the scanning timing and light source lighting timing of the liquid crystal display panel.
  • a red light source, a green light source, and a blue light source are sequentially turned on every time Tf of one field, and one subframe (time Tsf) is configured by three fields.
  • a signal is applied to each liquid crystal from the top to the bottom of the liquid crystal display panel 11, and after waiting for a predetermined time for the liquid crystal to be aligned, the corresponding color light source is turned on simultaneously. By doing so, an image of that color can be displayed.
  • the liquid crystal display panel 11 is scanned from the top to the bottom, data is set for each pixel (time Ts), the liquid crystal is oriented (time Td), and the light source is turned on. It is necessary to light (time Tl).
  • the corresponding area is determined.
  • the waiting time due to the time Ts for scanning each pixel of the liquid crystal display panel 11 from the top to the bottom basically disappears. Therefore, the time Tf per field is set to the liquid crystal orientation (time Td) and the light source.
  • time Td can be divided into only lighting (time Tl). Therefore, if the lighting time (Tl) of the light source is the same, the time (Td) required for the alignment of the liquid crystal may be longer. That is, it is understood that the response speed required for the liquid crystal is reduced by performing the scroll illumination.
  • one frame is divided into a plurality of, for example, two subframes. This is because if one frame is simply composed of three fields, there is a risk that color braking will occur in which the edge of the image being viewed is divided into rainbow colors due to movement of the eyeball or the like.
  • Tsf per subframe the number of seconds Tsf per subframe is 8.3 milliseconds, and field sequential display is performed in three colors such as red, green, and blue.
  • the time Tf per field is 2.8 milliseconds.
  • the response speed of the liquid crystal is limited to about 4 milliseconds at the fastest in the VA (Vertical Alignment) mode and IPS (In Plane Switching) mode.
  • VA Vertical Alignment
  • IPS In Plane Switching
  • FIG. 4 is a diagram showing the relationship between the response waveform of the liquid crystal in a pixel at a certain position and the lighting timing of the light source, and the response waveform of the liquid crystal corresponds to a change in transmittance with time.
  • the backlight control unit 141 can adjust the elapsed time Ton from the field start time (voltage application start time to the liquid crystal) to the light source lighting start time. That is, the backlight control unit 141 accelerates the irradiation start timing of the light from the light source 12 to the liquid crystal display panel 11 in each field (shortens the elapsed time Ton) or delays the irradiation start timing (longens the elapsed time Ton). Adjust the irradiation start timing. In this case, the following effects are obtained.
  • each light source 12 when the elapsed time Ton is shortened and each light source 12 is turned on for a long time, it is possible to display a bright image because the lighting time of the light source 12 is long.
  • the elapsed time Ton is lengthened and the lighting time of each light source 12 is relatively shortened, the light source 12 is turned on only at a desired transmittance, so that a high-quality image with a wide color reproduction range can be obtained. It becomes possible to provide.
  • a high-brightness image is desired in a bright environment (for example, in the daytime or under high illumination), so an image with excellent visibility can be provided by shortening the elapsed time Ton and increasing the brightness. I can do it.
  • a movie in a dark environment for example, at night or under low illumination
  • time zone during the day is not limited to 6 hours from 9:00 to 15:00 as described above, and may be, for example, 8 hours from 8:00 to 16:00. In short, it may be a bright time zone such as a predetermined time including noon. Further, for example, the time zone may be changed depending on the season.
  • the tuner 19 is connected to the backlight control unit 141 of the control unit 14, and the backlight control unit 141 determines that the program being viewed is a movie, for example. If it is determined that the elapsed time Ton is lengthened and the luminance is suppressed to provide a high-quality image with a wide color reproduction range, and it is judged as variety, news, etc., the elapsed time Ton is shortened to increase the luminance image. It is also possible to provide
  • the setting unit 6 when the setting unit 6 is configured to be operable by the user, for example, when the cinema mode is set, the color reproduction range is set while increasing the elapsed time Ton and suppressing the luminance. Wide and high-quality images may be provided.
  • the setting unit 6 when the setting unit 6 is set to a mode for viewing, for example, variety or news, the elapsed time Ton may be shortened to provide a high brightness image.
  • an illuminance sensor 18 (illuminance detection unit) is attached to the liquid crystal display panel 11, and the measured ambient brightness is determined by the backlight control unit 141. You may set to time Ton sequentially.
  • the illuminance sensor 18 is attached to the liquid crystal display panel 11, but is not limited thereto. For example, you may attach to the television main body 8, and you may attach to the remote control (illustration omitted) attached to the television main body 8.
  • FIG. it is only necessary to detect the brightness of a region that influences when the user visually recognizes the liquid crystal display panel 11, such as the brightness of the room in which the liquid crystal display panel 11 is installed.
  • a temperature sensor 17 for measuring the ambient temperature may be attached to the liquid crystal display panel 11, and the elapsed time Ton may be sequentially set according to the measured temperature. I do not care.
  • the driving speed (response speed) of the liquid crystal is slow at low temperatures. Therefore, as the temperature detected by the temperature sensor 17 decreases, the backlight control unit 141 can provide an image that maintains the color reproduction range by increasing the elapsed time Ton. On the other hand, when the temperature detected by the temperature sensor 17 increases, the backlight control unit 141 can provide a high-luminance image while maintaining the color reproduction range by gradually shortening the elapsed time Ton.
  • the elapsed time Ton and the light quantity of the light source 12 may be adjusted and switched by means other than the above examples, such as date information, sensor information, and user settings, or a plurality of means may be combined.
  • FIG. 6A is a cross-sectional view taken along the line 10A-10A (FIG. 1A) of the liquid crystal display device 10 as in FIG. 1B, and the light source 12 is divided into four illumination blocks 20a to 20d according to illumination timing.
  • Each of the illumination blocks 20a to 20d includes a red light source 12r, a blue light source 12b, and a green light source 12g.
  • FIG. 6B indicates the vertical pixel position of the liquid crystal display panel 11, and this figure shows the timing of turning on the liquid crystal of each pixel of the liquid crystal display panel 11 in the vertical direction and the light source 12. The timing of lighting is shown.
  • illustration of the drive circuit 7 is abbreviate
  • the backlight control unit 141 turns on the bottom row at the position corresponding to each of the illumination blocks 20a to 20d on the liquid crystal display panel 11 and sets the corresponding illumination block after the elapsed time Ton seconds.
  • the light source 12 is turned on.
  • the backlight control unit 141 turns off the light source 12 of the corresponding illumination block immediately before the top row of the next field at the position corresponding to each illumination block on the liquid crystal display panel 11 is turned on.
  • the above lighting and extinction are repeated for the red field, the green field, and the blue field in three colors to form one subframe, and this is repeated a predetermined number of times to form one frame. That is, one frame is divided into a predetermined number of subframes, and each subframe is composed of three fields corresponding to each color.
  • the red light source of the illumination block 20b is turned on at times t1 and t2, and the red light source of the illumination block 20b is also turned on. It can be seen that it is lit at time t3 to t4.
  • the illumination blocks 20a and 20b are divided as light sources, even if the liquid crystal display panel 11 is directly above the illumination block 20a, part of the light from the illumination block 20b reaches. In particular, a region near the boundary between the illumination blocks 20a and 20b receives light from the illumination blocks 20a and 20b on both sides.
  • the amount of red light transmitted through this pixel is obtained by multiplying the amount of red light emitted from the illumination block 20a to reach this pixel by the liquid crystal transmittance (that is, the liquid crystal response waveform) at each time, and The sum of the amount of light integrated up to t2 and the amount of light that reaches the main pixel in the red light emitted from the illumination block 20b is multiplied by the liquid crystal transmittance at each time to integrate the light from time t3 to t4. .
  • the liquid crystal transmittance that is, the liquid crystal response waveform
  • the drive control unit 142 calculates the light amount reaching the main pixel from the adjacent illumination block 20b from the distance from the adjacent illumination block 20b to the main pixel. This can be achieved by correcting the image data of this pixel in advance so that the amount of light transmitted from this pixel becomes the desired amount of light.
  • the liquid crystal response waveform at time t4 is the next field, green. Depends on the image data in the field.
  • the drive control unit 142 uses the image data in the red field and the image data in the green field, which is the next field, to determine the amount of light reaching the main pixel from the adjacent illumination block 20b, and the amount of light transmitted from the main pixel.
  • the image data of the main pixel By correcting the image data of the main pixel in advance so that the desired light amount is obtained, the light amount of red light transmitted from the main pixel can be corrected to be the desired light amount. In this way, even in the scroll illumination, it is possible to correct the gradation due to the difference in the light emission timing of the adjacent illumination blocks and provide a high-quality image faithful to the original image.
  • 255 is arranged in the green field Fg1 of the front subframe SF1, but it goes without saying that 255 is arranged in the green field Fg2 of the rear subframe SF2 as shown in FIG. 8C. I do not care.
  • FIG. 8 illustrates the case where one frame is divided into two subframes
  • the present invention is not limited to this.
  • one frame may be divided into four subframes.
  • the applied voltage may be set by decomposing in the order of high gradation, low gradation, high gradation, and low gradation, or in the order of high gradation, low gradation, low gradation, and high gradation.
  • the applied voltage may be set by decomposing, or the applied voltage may be set by decomposing in the order of high gradation, high gradation, low gradation, and low gradation.
  • the image data may be decomposed so that one frame is formed by combining two subframes to which a voltage corresponding to high gradation image data and a voltage corresponding to low gradation image data are respectively applied. . That is, in this case, one frame needs to be divided into even-numbered subframes.
  • a high gradation close to 255 is arranged in a front subframe SF1 in a predetermined pixel and close to 0 in a rear subframe SF2.
  • a low gradation is disposed near the front subframe SF1
  • a low gradation close to 0 is disposed near the rear subframe SF2, as shown in FIG. 8C.
  • High gradations may be arranged.
  • a voltage corresponding to high gradation image data close to 255 is applied to a predetermined target pixel, as shown in FIG. 8B, to the green field Fg1 of the front subframe SF1.
  • a voltage corresponding to low gradation image data close to 0 is applied to the green field Fg2 of SF2.
  • a voltage corresponding to low gradation image data close to 0 is applied to the green field Fg1 of the front subframe SF1, as shown in FIG.
  • a voltage corresponding to high gradation image data close to 255 is applied to the green field Fg2 of the rear subframe SF2.
  • the light source 12 is disposed on the back surface of the liquid crystal display panel 11 to directly illuminate the liquid crystal display panel 11 (direct type).
  • FIG. 9A is a front view of the liquid crystal display device 21, and FIG. 9B is a side view seen from the direction of the arrow 21A in FIG. 9A.
  • illustration of the drive circuit 7 and the control unit 14 is omitted.
  • the illumination area of the light source 12 is divided into illumination blocks 20a to 20d, and light guide plates 22a to 22d are assigned to the blocks 20a to 20d, respectively. Further, a red light source 12r, a green light source 12g, and a blue light source 12b are arranged on the left and right of the respective light guide plates 22a to 22d. Each light source 12r, 12g, 12b can use LED.
  • the light sources 12r, 12g, and 12b are arranged in the vicinity of the side surfaces of the light guide plates 22a to 22d.
  • the light sources 12r, 12g, and 12b are emitted.
  • the light is directly incident on the light guide plate 22a.
  • each light source 12r, 12g, and 12b is covered with a side reflector 24, and light that has not directly entered the light guide plate 22a is also reflected by the side reflector 24.
  • the light enters the light guide plate 22a.
  • Each of the light guide plates 22a to 22d has, for example, minute diffusion particles therein, and light incident on each of the light guide plates 22a to 22d is scattered by the minute diffusion particles in the light guide plates 22a to 22d, and the light guide plate 22a.
  • the light emitted from each of the light guide plates 22a to 22d in the direction opposite to the liquid crystal display panel 11 is reflected by the bottom reflector 23 and is scattered again in the light guide plates 22a to 22d. Contributes to lighting.
  • the luminance in the left and right directions of the light guide plates 22a to 22d can be made uniform.
  • the light sources 12r, 12g, and 12b arranged on the left and right of the respective illumination blocks 20a to 20d are made to correspond to the respective illumination blocks of the liquid crystal display panel 11 as in the liquid crystal display device 10 shown in FIG.
  • Each of the areas corresponding to 20a to 20d is illuminated.
  • the illumination of the front subframe SF1 is on the left side of each of the light guide plates 22a to 22d.
  • the arranged light sources 12r, 12g, 12b may be turned on, and the illumination of the rear subframe SF2 may be turned on by illuminating the light sources 12r, 12g, 12b arranged on the right side of the respective light guide plates 22a-22d.
  • the right light sources 12r, 12g, and 12b may be turned on in the front subframe SF1
  • the left light sources 12r, 12g, and 12b may be turned on in the rear subframe SF2.
  • the illumination block 20a turns on the left light sources 12r, 12g, and 12b
  • the illumination block 20b turns on the right light sources 12r, 12g, and 12b
  • the illumination block 20c turns on the left light sources 12r, 12g, and 12b.
  • the lighting block 20d lights the right light sources 12r, 12g, and 12b.
  • the lighting block 20a lights the right light sources 12r, 12g, and 12b
  • the lighting block 20b The light sources 12r, 12g, and 12b are turned on
  • the illumination block 20c is turned on for the right light sources 12r, 12g, and 12b
  • the illumination block 20d is turned on for the left light sources 12r, 12g, and 12b. You may make it light up. In this way, the color braking is further suppressed.
  • the liquid crystal display device 10 is a liquid crystal display device capable of three-dimensional display
  • the 3D display device displays the right eye image and the left eye image captured with parallax for the viewer's eyes, shows the right eye image only to the right eye, and shows the left eye image only to the left eye. There is a need.
  • a shutter is provided for each of the right eye and the left eye, shutter glasses 25 connected to the control device 26 are prepared, and the control device 26 is connected to the liquid crystal display device 10.
  • the control device 26 closes the left eye shutter of the shutter glasses 25 at the timing when the liquid crystal display device 10 displays the right eye image, and closes the right eye shutter of the shutter glasses 25 at the timing when the liquid crystal display device 10 displays the left eye image.
  • the person recognizes the displayed image as a three-dimensional image.
  • FIG. 11 a configuration diagram of the liquid crystal display device 30 is shown as an example when a laser is used as a light source.
  • 11A is a top view of the liquid crystal display device 30, and FIG. 11B is a side view of FIG. 11A viewed from the direction of the arrow 30A.
  • the liquid crystal display device 30 includes a red laser light source 32r that emits red laser light 34r, a green laser light source 32g that emits green laser light 34g, a blue laser light source 32b that emits blue laser light 34b, a collimator lens 33, and a rotating polygon mirror 35. , Fresnel lenses 36 and 37, and a light guide plate 38.
  • the red laser light 34r emitted from the red laser light source 32r is converted into substantially parallel light by the collimator lens 33 on the optical axis and then enters the rotary polygon mirror 35. Since the rotary polygon mirror 35 rotates in the direction of the arrow, the red laser light 34r is deflected and scanned in the direction of arrow 30B in the figure while being reflected by the rotary polygon mirror 35.
  • the Fresnel lens 36 has a curvature in the width direction of the light guide plate 38 (vertical direction in FIG. 11A), and the Fresnel lens 37 has a curvature in the thickness direction of the light guide plate 38 (vertical direction in FIG. 11B).
  • the red laser light 34 r incident on the Fresnel lens 36 is converted so that the traveling direction of the light beam becomes substantially horizontal after passing through the Fresnel lens 36, and further spread in the thickness direction of the light guide plate 38 by the Fresnel lens 37.
  • the light enters the light guide plate 38 from the light incident surface 38a.
  • the light guide plate 38 is molded from an optical resin such as acrylic, and incident light propagates while repeating total reflection in the light guide plate 38. Further, as shown in FIG. 11B, the bottom surface 38b of the light guide plate 38 has a shape in which planes parallel to the main surface 38c of the light guide plate 38 are periodically connected by a triangular prism. Therefore, the red laser beam 34 r incident on the triangular prism is totally reflected by the triangular prism without loss, and is uniformly emitted from the main surface 38 c of the light guide plate 38 toward the liquid crystal display panel 11.
  • the red laser light 34r is scanned in the light guide plate 38 from the upper side to the lower side in FIG. 11A, and the red laser light 34r incident on the light guide plate 38 is in the width direction (FIG. 11). It does not diffuse in the vertical direction (a). Accordingly, since the inside of the light guide plate 38 is linearly scanned from top to bottom in FIG. 11A, the liquid crystal display panel 11 is also linearly lined from top to bottom in FIG. 10A by the red laser light 34r. Will be scanned.
  • the red laser light 34r illuminates the liquid crystal display panel 11 in synchronization with the scanning timing of the image data in the liquid crystal display panel 11. Accordingly, the present liquid crystal display device 30 has a large number of illumination blocks in FIG. 6A, for example, and the light from each illumination block illuminates the liquid crystal display panel 11 substantially vertically. Can be considered.
  • the red laser beam 34r is incident on the detector 39, the scanning of the red laser beam 34r is completed, and the green laser beam 34g and the blue laser beam 34b are sequentially emitted, in the same manner as the red laser beam 34r.
  • the collimator lens 33 After being converted into substantially parallel light by the collimator lens 33, it is deflected and scanned by the rotary polygon mirror 35 and is raised by the light guide plate 38 to illuminate the liquid crystal display panel 11.
  • the red laser beam 34r, the green laser beam 34g, and the blue laser beam 34b have different incident angles with respect to the rotary polygon mirror 35, but the same region of the incident surface 38a of the light guide plate 38 is scanned by changing the incident position. I can do it. In this manner, field sequential illumination can be performed even using a laser light source.
  • the liquid crystal display panel 11 is not limited to the optical system of the liquid crystal display device 30 as long as the liquid crystal display panel 11 can be scanned and illuminated uniformly. Absent.
  • a laser light source is used as a light source, but the present invention is not limited to this as long as the light source has similar performance.
  • super luminescent diodes (SLD) 320r, 320g, and 320b may be used.
  • SLDs 320r, 320g, and 320b it becomes possible to configure a high-quality liquid crystal display device in which speckles are more difficult to visually recognize.
  • FIG. 12A and 12B are cross-sectional views corresponding to FIG. 1B of the first embodiment.
  • the drive circuit 7 is not shown.
  • the liquid crystal display device 40 is similar to the liquid crystal display device 10, but differs in terms of heat dissipation. As shown in FIG. 12A, in the liquid crystal display device 40, each light source 12 is connected to a heat conductor 41, and each heat conductor 41 is connected to a panel holding body 42 that holds the liquid crystal display panel 11. Has been. By doing so, the heat generated from each light source 12 is transmitted to the panel holding body 42 via the heat conductor 41 and finally transmitted to the liquid crystal display panel 11.
  • the response speed of liquid crystal increases as the temperature increases. Therefore, the response speed is increased by heating the liquid crystal.
  • a liquid crystal display device that requires a high-speed response of several milliseconds for the liquid crystal response speed like the field sequential method, a bright and high-quality liquid crystal display device faithful to the input image data is configured. It becomes possible to do.
  • liquid crystal display device 40 of the third embodiment by using the heat generated by the light source 12, energy that is originally lost as heat loss is used without loss.
  • the control unit 14 and the power source 43 where heat loss occurs are brought into contact with the panel holding body 42, similarly to the heat generated from each light source 12.
  • the heat generated by the control unit 14 and the power source 43 may also be transmitted to the liquid crystal display panel 11. By doing so, the liquid crystal display panel 11 can be further heated, and a bright and high-quality liquid crystal display device that is faithful to the input image data can be configured.
  • the liquid crystal display panel 11 has a thickness of 1.2 mm in about 3 minutes. It will increase by 10 ° C.
  • the liquid crystal display device 40 may include the temperature sensor 17 inside. If the temperature when the power source 43 is turned on is lower than a predetermined temperature by the backlight control unit 141 (see FIG. 1) of the control unit 14, each light source 12 is lit as brightly as possible in each field (that is, FIG. 1). By shortening the elapsed time Ton in 4 (b), the liquid crystal display panel 11 can be heated early. As a result, a bright and high-quality liquid crystal display device that is faithful to the input image data can be configured.
  • the metal wiring 44 is directly wound around the liquid crystal display panel 11 from the control unit 14, and the metal wiring 44 is formed as necessary.
  • the liquid crystal display panel 11 may be heated by flowing current to cause the metal wiring 44 to generate heat.
  • the metal wiring 44 can be heated without obstructing the transmitted light by rolling around a place other than the opening of each liquid crystal pixel, such as the vicinity of each signal line DLm and the scanning line GLn.
  • the material is not limited to metal, and it does not matter whether the shape is linear or not.
  • FIG. 13A is an enlarged view of the liquid crystal display panel 11 as viewed from the direction of the arrow 10Y in FIG. 1B, and is surrounded by scanning lines (GLn-2 to GLn) and signal lines (DLm-2 to DLm). The region that corresponds to each pixel.
  • a TFT thin film transistor
  • the scanning line GLn-2 is connected to the gate electrode of the TFT
  • the signal line DLm-2 is connected to the drain electrode.
  • a transparent electrode 46 is connected to the source electrode of the TFT as shown in FIG. 13A.
  • a wide gap semiconductor film is usually used.
  • an ITO (indium tin oxide) film in which 5 to 10% of tin oxide is added to indium oxide is often manufactured by a method such as sputtering.
  • each light source 12 is absorbed by the transparent electrode 46.
  • a wide gap semiconductor such as ITO has an electromagnetic wave absorption edge in an ultraviolet region near 400 nm, and thus most of ultraviolet rays corresponding to about 400 nm or less are absorbed.
  • an ultraviolet light source 12uv that emits ultraviolet light may be included. According to this configuration, when the transparent electrode 46 absorbs the ultraviolet light emitted from the ultraviolet light source 12uv, the transparent electrode 46 generates heat and the liquid crystal can be heated.
  • a temperature sensor 17 is provided in the liquid crystal display device 30, and when the measured temperature is low by the control unit 14, the built-in ultraviolet light source 12uv is driven. By absorbing the emitted ultraviolet light by the transparent electrode 46, the liquid crystal can be heated and the response speed of the liquid crystal can be accelerated.
  • the ultraviolet light source 12uv does not contribute to image formation, it may be constantly lit regardless of the period of each field.
  • an LED light source in which a phosphor is excited by ultraviolet rays to emit visible light such as red, blue, and green may be used as one of the light sources 12.
  • the light source 12 is a red LED 120r, a blue LED 120b, and an ultraviolet-excited green LED 120g that is excited by ultraviolet rays to emit green light
  • the transparent electrode 46 generates heat by absorbing the remaining ultraviolet rays and contributes to heating the liquid crystal.
  • the liquid crystal display device 40 can be configured without providing a dedicated ultraviolet light source, and thus the field sequential type liquid crystal display device as described above can be configured at low cost.
  • the conversion efficiency of an LED near a wavelength of 400 nm exceeds 50% in external quantum efficiency, but the external quantum efficiency of a green LED is as low as 20% or less. Therefore, obtaining green light from the ultraviolet-excited green LED 120g having a high external quantum efficiency has an advantage in terms of conversion efficiency.
  • the red laser light source 121r, the blue laser light source 121b, and the infrared laser light from the infrared laser light source 1211 are converted into wavelength converters.
  • the green laser light source 121g that obtains green laser light by wavelength conversion by 1212 the infrared laser light remaining without wavelength conversion is configured to be emitted from the backlight.
  • the liquid crystal can also be heated by absorbing the laser light into the transparent electrode 46.
  • a YAG laser 1064 nm laser light source is used as the infrared laser light source 1211, and the emitted infrared laser light is incident on a wavelength conversion element 1212 such as lithium niobate (LiNbO 3 ) as a fundamental wave.
  • a wavelength conversion element 1212 such as lithium niobate (LiNbO 3 ) as a fundamental wave.
  • LiNbO 3 lithium niobate
  • the fundamental wave of 1064 nm remaining without wavelength conversion is absorbed by the transparent electrode 46.
  • the transparent electrode 46 such as ITO has an absorption edge at about 400 nm.
  • oxygen-deficient or colored transition metal ions such as titanium, chromium, and iron
  • an absorption band is generated in the visible region and the infrared region. It becomes possible to do.
  • the transparent ion 46 can absorb light even in the infrared region by using an iron ion-introduced transparent electrode 46 into which iron ions are introduced. Therefore, the transparent wave 46 can absorb the fundamental wave of 1064 nm by emitting the fundamental wave of 1064 nm that has not been wavelength-converted in the same manner as other visible light that contributes to image formation.
  • the liquid crystal can be heated without providing a dedicated light source. Therefore, even in a liquid crystal display device that requires a high response speed of several milliseconds for the response speed of the liquid crystal like the field sequential method, a high-quality liquid crystal display device that is bright and faithful to the input image data is inexpensively configured. It becomes possible to do.
  • an example is shown in which the wavelength of 1064 nm YAG laser light is converted, but the third embodiment is not limited to this, and the light source that contributes to image formation by converting the wavelength of infrared light. If it is, it can be used similarly.
  • an infrared light source may be prepared exclusively for heating.
  • the liquid crystal display device 40 that does not have a dedicated light source that emits light to be absorbed by the transparent electrode 46
  • visible light used for image formation can be absorbed by the transparent electrode 46.
  • the transparent electrode 46 For example, as in the case where infrared light is absorbed by introducing iron ions in the above, as shown in FIG. 13 (f), by using the titanium ion-introduced transparent electrode 46 into which titanium ions are introduced, the blue color is obtained. It can be colored. That is, since it has absorption in the yellow region that is the complementary color of blue, it absorbs green and red light.
  • the liquid crystal display device 40 is configured without providing a dedicated light source that emits light to be absorbed by the transparent electrode 46 by causing the transparent electrode 46 to absorb part of the light used for image formation.
  • the liquid crystal display device having a high response speed and high image quality can be provided at low cost.
  • a liquid crystal display device with a 37-inch screen size (diagonal length) described above can be heated at about 10 ° C. in about 20 minutes. Can be warmed and desirable. If color correction is performed according to the color of the colored transparent electrode 46, an image faithful to the input image data can be formed.
  • the liquid crystal can be heated by a method different from the above.
  • 14 is a cross-sectional view of the liquid crystal display panel 11 taken along the line 40B-40B in FIG.
  • signal lines (DLm-2 to DLm) are arranged on a lower glass plate 48, a common electrode 47 is provided under the upper glass plate 49, and a liquid crystal layer having a thickness of several micrometers is provided therebetween.
  • the structure which sandwiches 50 is taken. Further, the spacer 51 is introduced into the liquid crystal layer 50 so that the thickness of the liquid crystal layer 50 is several micrometers.
  • silica silicon dioxide, SiO 2
  • SiO 2 silica
  • a part of visible light that contributes to image formation emitted from each light source 12 is absorbed in the same manner as the colored transparent electrode described above. Can be made.
  • the spacer 51 since the spacer 51 generates heat by absorbing light, the liquid crystal can be heated. As a result, it is possible to increase the response speed of the liquid crystal, and it is possible to provide a liquid crystal display device with a high response speed and high image quality.
  • silica is transparent including the ultraviolet region
  • acrylic is transparent in the visible region but has absorption in the ultraviolet region. Therefore, acrylic may be used as the spacer 51 instead of silica.
  • a light source that emits ultraviolet light for example, the ultraviolet light source 12uv shown in FIG. 13B
  • a light source for example, ultraviolet-excited green LED 120g shown in FIG. 13C
  • the spacer 51 generates heat by absorbing the ultraviolet light, and the liquid crystal Can be heated.
  • the spacer 51 can also be made of a material having absorption in the ultraviolet region such as acrylic, so that the liquid crystal can be heated and the response speed of the liquid crystal can be increased.
  • the liquid crystal display device having an image quality can be provided.
  • the liquid crystal display device having the above-described screen size (diagonal length) of 37 inches can take 20 minutes.
  • the liquid crystal panel can be heated by about 10 ° C., which is desirable.
  • the displayable color range is 84% of the NTSC ratio.
  • the liquid crystal display panel 11 can be heated to increase the response speed of the liquid crystal.
  • the liquid crystal display device having an image quality can be provided.
  • the light absorption in the transparent electrode 46 and the spacer 51 was shown as an example in the above, this Embodiment 3 is not limited to it, and another structure may be used as long as it has the same effect.
  • the liquid crystal itself may absorb light or may be absorbed by a glass plate or the like.
  • each of the above-described embodiments has been described with respect to a field sequential type liquid crystal display device, the other types are also effective in the case of driving the liquid crystal at high speed.
  • the other types are also effective in the case of driving the liquid crystal at high speed.
  • an image 1 is used to improve moving image response.
  • This is also effective in a liquid crystal display device that is driven at a high speed of 2 ⁇ or more, in which a frame is divided into a plurality of subframes.
  • FIGS. 15A is a schematic configuration diagram of the liquid crystal display device according to the fourth embodiment
  • FIG. 15B is a cross-sectional view taken along the line 100A-100A in FIG. 15A
  • FIG. It is sectional drawing in the 100B-100B line of (a).
  • the liquid crystal display device 100 includes a side illumination light source 101 and a panel assembly 102 as schematically shown in FIG.
  • the side illumination light source 101 includes a white light source 101b and a side reflector 101a that covers three sides of the white light source 101b.
  • the panel assembly 102 includes a light guide plate 102a, a liquid crystal display panel 102b, and a reflection plate 102c.
  • the liquid crystal display panel 102b includes a front polarizing plate 102d, a front glass plate 102e, a reflective color filter 102f, a liquid crystal layer 102g, a rear glass plate 102h, and a rear polarizing plate 102i.
  • the white light source 101b may be a fluorescent lamp such as CCFL or HCFL (hot-cathode-fluorescent-lamp), may be a white LED, or may be a combination of a plurality of LEDs that are white by mixing red, blue, and green LEDs.
  • CCFL CCFL
  • HCFL hot-cathode-fluorescent-lamp
  • white LED white LED
  • other light sources may be used, and the type is not limited here.
  • White light 103W emitted from the white light source 101b is incident on the light guide plate 102a from the side surface of the light guide plate 102a while being partially reflected by the side reflector 101a.
  • the white light 103W incident on the light guide plate 102a travels while being totally reflected in the light guide plate 102a.
  • the light guide plate 102a is provided with a large number of prisms 102j as shown in FIG.
  • the white light 103W incident on the prism 102j rises in a substantially vertical direction as shown in FIG. 15B, is emitted from the light guide plate 102a, and enters the liquid crystal display panel 102b.
  • the reflective color filter 102f in the liquid crystal display panel 102b includes a red transmission filter 104r, a green transmission filter 104g, and a blue transmission filter 104b.
  • the red transmission filter 104r transmits only the red light 103r included in the white light 103W, and has a characteristic of reflecting the green light 103g and the blue light 103b other than the red light 103r included in the white light 103W.
  • the green transmission filter 104g has a characteristic of transmitting only the green light 103g and reflecting the red light 103r and the blue light 103b
  • the blue transmission filter 104b transmits only the blue light 103b and transmits the red light 103r and the green light 103g. It has the property of reflecting.
  • Such a reflective color filter 102f can be obtained, for example, by coating a plurality of dielectric multilayer films. In this case, coats having different film thicknesses are applied to the red transmission filter 104r, the green transmission filter 104g, and the blue transmission filter 104b on a substrate such as glass by a plurality of layers.
  • This coating is generally performed by alternately laminating a high refractive index film and a low refractive index film.
  • the film-forming material is not limited to the above-described materials as long as desired characteristics can be obtained, and the film-forming method can be continuously applied by, for example, coating other than vapor deposition. Application makes it possible to coat a long distance at a time, which is convenient for coating a certain large area. Of course, any method other than coating may be used. For example, a desired performance can be obtained by laminating sub-wavelength gratings, and the manufacturing method is not limited here.
  • the white light 103W emitted upward from the light guide plate 102a is aligned in the polarization direction by the front polarizing plate 102d as shown in FIG. 15C, and then passes through the front glass plate 102e to become a reflective color filter 102f. To reach.
  • the white light 103W reaches the red transmission filter 104r of the reflective color filter 102f as shown in FIG. 15C, only the red light 103r is transmitted among the light included in the white light 103W, and the remaining light is left.
  • the green light 103g and the blue light 103b are reflected.
  • the reflected green light 103g and blue light 103b pass through the light guide plate 102a, are reflected upward by the reflection plate 102c, and enter the reflection type color filter 102f again.
  • the red light 103r is subjected to multiple reflections between the reflective color filter 102f and the reflection plate 102c until reaching the red transmission filter 104r.
  • the green light 103g and the blue light 103b are also subjected to multiple reflections between the reflective color filter 102f and the reflection plate 102c until reaching the green transmission filter 104g and the blue transmission filter 104b, respectively. .
  • This method is called a color separation method.
  • the light incident on the light guide plate 102a is used without loss, so that a highly efficient liquid crystal display device 100 can be configured. .
  • FIG. 18 is a diagram showing the control timing of each pixel of the liquid crystal display device 100.
  • (a) shows the case of the drive circuit shown in FIG. 16, and (b) shows the case of the drive circuit shown in FIG. Show.
  • one pixel is formed by three sub-pixels of red, green, and blue.
  • the pixels are arranged in a matrix in the first direction (horizontal direction in FIG. 16) and the second direction (vertical direction in FIG. 16).
  • the red subpixel Sr (n) is arranged nth from the left end
  • the green subpixel Sg (n) is arranged nth from the left end
  • the blue subpixel Sb (n) is arranged nth from the left end.
  • the pixel P (n) is arranged nth from the left end.
  • a scanning line GLm is arranged in the m-th column from the top.
  • the signal line DLr (n) is connected to the red subpixel Sr (n) of the nth pixel from the left
  • the signal line DLg (n) is connected to the green subpixel Sg (n) of the nth pixel from the left.
  • the signal line DLb (n) is connected to the blue subpixel Sb (n) of the nth pixel from the left.
  • each subpixel has a TFT (thin film transistor) gate electrode connected to a scanning line (GL1,..., GLm,...) And a drain electrode connected to a signal line (. (N), DLg (n), DLb (n), etc).
  • the source electrode of the TFT is connected to a transparent electrode (not shown), and further connected to the common electrode Vcom via a liquid crystal having a capacitance Clc.
  • the signal lines DLr (n) and the like are connected to the source driver 105, and the scanning lines GLm and the like are connected to the gate driver 106.
  • a drive circuit is constituted by the source driver 105, the gate driver 106, the TFT, the transparent electrode, the common electrode Vcom, and the like.
  • the gate driver 106 and the source driver 105 are controlled by the drive control unit 107 of the control unit 109, and each signal is synchronized with the timing when the ON signal (scanning signal) is applied to a desired scanning line (GLm or the like).
  • the voltage of each signal line is applied across the liquid crystal so that the liquid crystal of the subpixel connected to the line (DLr (n), etc.) has a desired transmittance.
  • the drive control unit 107 controls the gate driver 106 and the source driver 105, and normally is sequentially turned on in order from the top of the scanning line (GL1,..., GLm-1, Glm, GLm + 1,). Since a signal (scanning signal) is applied and a desired voltage is applied to the liquid crystal via the signal line (a driving signal is supplied) in synchronization therewith, an image displayed from the top to the bottom of the liquid crystal display panel 102b is displayed. Will be updated. Note that the backlight control unit 108 of the control unit 109 controls light emission of the white light source 101b.
  • the red subpixel, the green subpixel, and the blue subpixel in the same pixel are usually given signals simultaneously, and the liquid crystal is driven.
  • the ON timing and OFF timing of the red subpixel Sr (n), the green subpixel Sg (n), and the blue subpixel Sb (n) are the same.
  • the driving circuit shown in FIG. Since several ⁇ 3 pieces are required, the number of parts has increased.
  • the red switch Kr (n), the green switch Kg (n), and the blue switch Kb (n) are connected in parallel to the nth signal line DL (n) from the left end. .
  • the red switch Kr (n) is provided on the signal line DLr (n) connected to the red subpixel Sr (n)
  • the green switch Kg (n) is a signal line connected to the green subpixel Sg (n).
  • the blue switch Kb (n) is provided on the signal line DLb (n) connected to the blue subpixel Sb (n).
  • the switches Kg (n), Kb (n), and Kr (n) are connected to the source driver 105 through control lines L11, L12, and L13, respectively, and are turned on and off by the drive control unit 107. Is controlled.
  • the colors of the sub-pixels connected to the control lines L11, L12, and L13 are different in adjacent pixels. That is, to the control line L11, the green switch Kg (n) is connected to the nth pixel P (n) from the left end, and in the pixel P (n ⁇ 1) adjacent to the left side in FIG. A red switch provided on a signal line connected to the pixel Sr (n ⁇ 1) is connected, and in the pixel P (n + 1) adjacent to the right side in FIG. 17, it is connected to the blue subpixel Sb (n + 1). A blue switch provided on the signal line is connected.
  • the blue line Kb (n) is connected to the control line L12 in the nth pixel P (n) from the left end, and in the pixel P (n ⁇ 1) adjacent to the left side in FIG.
  • a green switch provided on a signal line connected to the sub-pixel Sg (n ⁇ 1) is connected.
  • the pixel P (n + 1) adjacent to the right side is connected to the red sub-pixel Sr (n + 1).
  • a red switch provided on the signal line is connected.
  • a red switch Kr (n) is connected to the control line L13 in the nth pixel P (n) from the left end, and in the pixel P (n ⁇ 1) adjacent to the left side in FIG.
  • a blue switch provided on a signal line connected to the pixel Sb (n ⁇ 1) is connected, and a signal connected to the green subpixel Sg (n + 1) in the pixel P (n + 1) adjacent to the right side in FIG. 17 is connected.
  • a green switch provided on the line is connected.
  • a configuration for heating the liquid crystal shown in the third embodiment may be further provided.
  • an ultraviolet light source shown in FIG. 13 (b) an infrared light source and an iron ion introduction transparent electrode shown in FIG. 13 (e), or a titanium ion introduction transparent electrode shown in FIG. 13 (f) are provided.
  • the spacer shown in FIG. 14 and an ultraviolet light source can be provided.
  • the optical system using the light guide plate 102a as shown in FIG. 15 is described as an example of the optical system that illuminates the panel assembly 102 with the white light 103W.
  • the present invention is of course limited to this. Instead, other optical systems may be used.
  • a liquid crystal display device includes a liquid crystal display panel having a plurality of pixels and displaying an image corresponding to input image data, and applying the voltage to the liquid crystal display panel to provide the liquid crystal display.
  • a driving circuit for driving the panel; a backlight for irradiating the liquid crystal display panel with light of a plurality of colors from the back; a drive control unit for controlling the driving circuit; and controlling the irradiation of light from the backlight.
  • a backlight control unit wherein one frame is divided into a plurality of sub-frames, and each sub-frame is further divided into a plurality of fields respectively corresponding to the light of the plurality of colors.
  • the drive control unit does not make the voltage applied to the liquid crystal display panel in each field zero near the end of each field.
  • the drive circuit is controlled so as to continue the voltage application until the end of each field, and the backlight control unit adjusts the irradiation start timing of the light from the backlight in each field.
  • the drive control unit controls the drive circuit so that the voltage application is continued until the end of each field without resetting the voltage applied to the liquid crystal display panel in the vicinity of the end of each field to zero. Therefore, it is possible to ensure a long time for the alignment of the liquid crystal and to bring the transmittance of the liquid crystal near the end of each field close to a desired value.
  • the backlight control unit adjusts the light irradiation start timing from the backlight in each field, for example, a high brightness image is obtained by increasing the light irradiation time by increasing the irradiation start timing.
  • the backlight control unit may continue the irradiation of light of a color corresponding to the field until the end of the field in each field. According to this configuration, since the backlight control unit continues to irradiate light of the color corresponding to the field until the end of the field in each field, light irradiation is performed by adjusting the irradiation start timing. The time can also be adjusted.
  • the liquid crystal display device may further include an illuminance detection unit that detects illuminance, and the backlight control unit may adjust the irradiation start timing according to the detected illuminance detected by the illuminance detection unit. I do not care. According to this configuration, since the irradiation start timing is adjusted by the backlight control unit according to the detected illuminance detected by the illuminance detection unit, it is possible to obtain image quality according to the brightness of the detected area. it can.
  • the area for detecting the illuminance may be, for example, the vicinity of the display surface side of the liquid crystal display panel, or the room where the liquid crystal display panel is arranged.
  • the backlight control unit may advance the irradiation start timing as the detected illuminance increases, and delay the irradiation start timing as the detected illuminance decreases.
  • the irradiation start timing is advanced as the detected illuminance increases, the light irradiation time becomes longer by the backlight control unit, so that a brighter image can be formed as the illuminance detection region becomes brighter. it can.
  • the irradiation start timing is delayed as the detected illuminance decreases, light is emitted when the transmittance of the liquid crystal approaches the desired value, so an image with higher color reproducibility becomes darker as the illuminance detection region becomes darker. Can be formed. Therefore, an image having a quality suitable for the brightness of the illuminance detection region can be obtained.
  • the liquid crystal display device may further include a time measuring unit that measures time, and the backlight control unit may adjust the irradiation start timing based on the time measured by the time measuring unit.
  • the backlight control unit may adjust the irradiation start timing based on the time measured by the time measuring unit.
  • the backlight control unit may advance the irradiation start timing when the time measured by the time measuring unit is included in a predetermined time including noon, and otherwise.
  • the irradiation start timing may be delayed.
  • the backlight control unit makes the irradiation start timing earlier and the light irradiation time becomes longer. Can be formed.
  • the time is other than that, since the irradiation start timing is delayed, light is emitted when the transmittance of the liquid crystal approaches the desired value, so an image with high color reproducibility when the periphery is dark Can be formed. Therefore, it is possible to obtain an image having a quality suitable for the surrounding brightness.
  • the predetermined time including noon may be, for example, 8 hours from 8 am to 4 pm, or 6 hours from 9 am to 3 pm.
  • the liquid crystal display device may further include a temperature detection unit that detects an ambient temperature of the liquid crystal display panel, and the backlight control unit may perform the irradiation according to the detected temperature detected by the temperature detection unit.
  • the start timing may be adjusted. According to this configuration, since the irradiation control timing is adjusted by the backlight control unit according to the detected temperature detected by the temperature detection unit, the response speed of the liquid crystal changes depending on the temperature, so the response of the liquid crystal The irradiation start timing suitable for the speed can be set.
  • the backlight control unit may advance the irradiation start timing as the detection temperature becomes higher, and delay the irradiation start timing as the detection temperature becomes lower.
  • a liquid crystal display device includes a liquid crystal display panel having a plurality of pixels and displaying an image corresponding to input image data, and applying the voltage to the liquid crystal display panel to apply the liquid crystal
  • a drive circuit that drives the display panel, a backlight that irradiates the liquid crystal display panel with light of a plurality of colors from the back surface, a drive control unit that controls the drive circuit, and control of light irradiation from the backlight
  • a backlight control unit that divides one frame into a plurality of subframes, and further subdivides each subframe into a plurality of fields respectively corresponding to the plurality of colors of light.
  • a liquid crystal display device that forms the image by irradiating the image, wherein the drive control unit applies to the liquid crystal display panel based on the image data in each field corresponding to light of the same color included in the one frame.
  • the drive circuit is controlled so that the voltage to be applied is different between at least two of the subframes.
  • driving is performed so that the voltage applied to the liquid crystal display panel based on the image data in each field corresponding to the same color light included in one frame has a different value between at least two subframes.
  • the drive circuit is controlled by the control unit.
  • the applied voltage in at least two subframes is decomposed into different values, so that the voltage value corresponding to the intermediate gradation can be prevented.
  • the response speed of the liquid crystal decreases when a voltage corresponding to an intermediate gradation is applied. Therefore, according to this configuration, since the drive control unit controls the drive circuit so that the voltage value does not correspond to the intermediate gradation, the liquid crystal can be driven at a high speed, and thus it is faithful to the image data. High quality images can be provided.
  • the gradation of the same color is different between at least two subframes, there is an effect of suppressing color braking when an image is viewed.
  • the drive control unit may perform high gradation in each field corresponding to light of the color included in the one frame when one color of the image data is intermediate gradation.
  • the drive circuit is controlled so that the one frame is formed by combining two subframes that apply a voltage corresponding to image data and a voltage corresponding to low gradation image data to the liquid crystal display panel, respectively.
  • the color may be set to an intermediate gradation.
  • the drive control unit controls the drive circuit so that two frames applied to the liquid crystal display panel are combined to form one frame, so that the color is set to an intermediate gradation. Therefore, even if one color of the image data is an intermediate gradation, a voltage corresponding to the intermediate gradation is not applied, so that it is possible to prevent a decrease in the response speed of the liquid crystal. Therefore, it is possible to provide a high quality image faithful to the image data.
  • the intermediate gradation image data can be a predetermined range including 128, for example, 85 to 170, for example, when gradation is expressed by 8 bits. Then, gradations above this range may be used as high gradation image data, and gradations below this range may be used as low gradation image data.
  • the drive control unit may be a pixel of interest in at least one color with respect to a voltage applied to the liquid crystal display panel based on the image data in each field included in the one frame. Even if the applied voltage in the subpixel is different between two consecutive subframes, the magnitude relationship of the applied voltage between the two subframes in the adjacent pixels adjacent to the target pixel may be reversed from the magnitude relationship in the target pixel. I do not care.
  • the applied voltage at a certain target pixel in at least one color is between two consecutive subframes.
  • the magnitude relationship of the applied voltages between the two subframes in the adjacent pixel adjacent to the pixel of interest is reversed from the magnitude relationship of the pixel of interest. That is, the magnitude relationship of the applied voltage between the two subframes is reversed between the target pixel and the adjacent pixel. Therefore, since the gradation of the same color is different in the same subframe in adjacent pixels, there is an effect of further suppressing color braking when an image is viewed.
  • a liquid crystal display device includes a liquid crystal display panel having a plurality of pixels and displaying an image corresponding to input image data, and applying a voltage to the liquid crystal display panel to A driving circuit that drives the liquid crystal display panel; a backlight that irradiates the liquid crystal display panel with light of a plurality of colors from the back; a drive control unit that controls the driving circuit; and illumination of light from the backlight.
  • a backlight control unit for controlling, one frame is divided into a plurality of subframes, and each subframe is further divided into a plurality of fields respectively corresponding to the light of the plurality of colors, and in each field, the image Based on the data, the liquid crystal display panel is driven, and light of a color corresponding to the field is transmitted from the backlight to the liquid crystal display panel.
  • the liquid crystal display device forms the image by irradiating the liquid crystal display panel, and the liquid crystal display panel includes a liquid crystal layer inside and a transparent electrode for applying a voltage to the liquid crystal layer by the driving circuit.
  • the light emitted from the backlight includes infrared light or ultraviolet light
  • the transparent electrode is formed of a material that generates heat by absorbing infrared light or ultraviolet light.
  • the transparent electrode is formed of a material that absorbs infrared light or ultraviolet light and generates heat
  • the transparent electrode absorbs infrared light or ultraviolet light included in the light emitted from the backlight. Since the transparent electrode generates heat, the liquid crystal display panel can be heated.
  • the response speed of the liquid crystal decreases when the temperature is low.
  • the liquid crystal display panel can be heated, it is possible to prevent the response speed of the liquid crystal from being lowered, and as a result, it is possible to obtain a high-quality image.
  • the light source that emits at least one of the light of the plurality of colors emitted from the backlight includes a light emitting unit that emits infrared light or ultraviolet light, and the infrared light.
  • a light emitting unit that emits infrared light or ultraviolet light
  • the infrared light may have a wavelength conversion unit that converts the wavelength of the ultraviolet light, and the light that remains without being wavelength-converted by the wavelength conversion unit may be emitted from the backlight.
  • the light source that emits at least one of the light of the plurality of colors emitted from the backlight includes the light emitting unit that emits infrared light or ultraviolet light, and the wavelength of the infrared light or ultraviolet light.
  • a wavelength conversion unit that converts the wavelength of the light of at least one of a plurality of colors that is converted from infrared light or ultraviolet light emitted from the light-emitting unit by the wavelength conversion unit. Generated by. Since the light remaining without being wavelength-converted, that is, infrared light or ultraviolet light is emitted from the backlight, the transparent electrode generates heat due to the infrared light or ultraviolet light. . Therefore, since the liquid crystal display panel can be heated, it is possible to prevent the response speed of the liquid crystal from being lowered, and as a result, a high-quality image can be obtained.
  • the light source that emits the light of the plurality of colors from the backlight may include a light emitting diode (LED) that emits red light, blue light, and green light, respectively.
  • LED light emitting diode
  • the first signal line is provided corresponding to the pixel.
  • the source driver supplies a drive signal for turning on the switches to the switches, and the source driver includes the second signal lines and the switches.
  • a drive signal is supplied to each of the sub-pixels via each of the first signal lines that is turned on, and the drive control unit is connected to three sub-pixels included in the pixel for each of the pixels.
  • the on-timing of the respective switches of the first signal lines thus made is made different from the source driver at different timings with respect to the sub-pixels of the respective colors included in the respective pixels arranged in the second direction.
  • the drive signal is supplied.
  • the number of second signal lines connected to the source driver is 1/3 of that of the first signal line, the number of circuits in the source driver can be reduced as compared with the configuration in which each first signal line is connected to the source driver. Can be reduced. Therefore, the number of parts constituting the source driver can be reduced.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un afficheur à cristaux liquides qui comprend un panneau d'affichage à cristaux liquides (11), un circuit de commande (7) qui commande le panneau d'affichage à cristaux liquides et un rétroéclairage (12) qui éclaire le panneau d'affichage à cristaux liquides avec des lumières d'une pluralité de couleurs à partir du côté arrière du panneau. Une trame est divisée en une pluralité de sous-trames (Tsf), et chacune des sous-trames est divisée en une pluralité de champs (Tf) correspondant chacun à l'une des lumières de la pluralité de couleurs. L'afficheur à cristaux liquides forme des images en commandant le panneau d'affichage à cristaux liquides sur la base des données d'image dans chaque champ et en émettant les lumières des couleurs correspondant aux champs du rétroéclairage vers le panneau d'affichage à cristaux liquides. L'afficheur à cristaux liquides comprend en outre une unité de contrôle de commande (142) qui commande un circuit de commande de sorte que l'application de tension se poursuive jusqu'à la fin de chaque champ sans ramener la tension appliquée au panneau d'affichage à cristaux liquides dans chaque champ à zéro à proximité de la fin de chaque champ, et une unité de commande de rétroéclairage (141) qui ajuste les synchronisations de début d'émission (Ton) des lumières à partir du rétroéclairage dans chaque champ.
PCT/JP2010/006552 2009-11-10 2010-11-09 Afficheur à cristaux liquides WO2011058728A1 (fr)

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WO2013125384A1 (fr) * 2012-02-22 2013-08-29 シャープ株式会社 Dispositif d'affichage et son procédé de commande
WO2013183509A1 (fr) * 2012-06-05 2013-12-12 シャープ株式会社 Dispositif d'affichage à cristaux liquides et son procédé de commande
JP2013254149A (ja) * 2012-06-08 2013-12-19 Sharp Corp 表示装置およびその駆動方法

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JP6194654B2 (ja) * 2013-06-24 2017-09-13 セイコーエプソン株式会社 電気光学装置、電気光学装置の駆動方法、及び、電子機器
JP6774320B2 (ja) 2016-11-29 2020-10-21 日亜化学工業株式会社 表示装置

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