WO2005012985A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
- Publication number
- WO2005012985A1 WO2005012985A1 PCT/JP2003/009893 JP0309893W WO2005012985A1 WO 2005012985 A1 WO2005012985 A1 WO 2005012985A1 JP 0309893 W JP0309893 W JP 0309893W WO 2005012985 A1 WO2005012985 A1 WO 2005012985A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid crystal
- crystal display
- light source
- display device
- timing
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/061—Details of flat display driving waveforms for resetting or blanking
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
Definitions
- the present invention relates to a field-sequential type or a color filter type liquid crystal display device.
- Liquid crystal display devices are widely used as one of the means for achieving such a purpose. Liquid crystal display devices are indispensable technologies for not only reducing the size and weight but also reducing the power consumption of battery-driven portable electronic devices.
- Liquid crystal display devices can be broadly classified into reflection type and transmission type.
- the reflective type has a configuration in which light rays incident from the front of the liquid crystal panel are reflected on the back side of the liquid crystal panel, and the reflected light allows the image to be viewed.
- the transmissive type is a light source (back light This is a configuration in which an image can be visually recognized by the transmitted light from.
- the reflective type is inferior in visibility because the amount of reflected light is not constant depending on the environmental conditions, and in particular, a color filter is generally used as a display device such as a personal computer that performs multi-color or full-color display. The used transmissive color liquid crystal display device is used.
- TFT Thin Film Transistor
- STN Super Twisted Nematic
- the liquid crystal panel currently has a light transmittance of only about 4%.
- a high-luminance backlight is required.
- the power consumption of the backlight increases.
- one pixel must be composed of three sub-pixels, making it difficult to achieve high definition, and the display color purity is not sufficient.
- a field-type liquid crystal display device for example, Toshiaki Yoshihara, et al., T. Yoshihara, et. al.: ILCC 98 (ILCC 98) P1-074 Published in 1998, Toshiaki Yoshihara, et al. (T. Yosh ihara, et. al.)
- the display device does not require sub-pixels, so it is possible to easily realize a display with higher definition.Also, the light emission color of the light source can be used without using a color filter. Because it can be used for display, it has excellent display color purity. Furthermore, it has the advantage of low power consumption due to high light use efficiency. However, in order to realize a field-sequential liquid crystal display device, high-speed response of the liquid crystal (2 ms or less) is essential.
- a filter having the above-mentioned excellent advantages In order to increase the response speed of a liquid crystal display device of the sequential or color filter type, a spontaneous spontaneous response can be expected, which is 100 to 100 times faster than the conventional one.
- Research and development has been conducted on driving a liquid crystal such as a ferroelectric liquid crystal having a polarization by using a switching element such as a TFT (for example, Japanese Patent Application Laid-Open No. H11-119189).
- a ferroelectric liquid crystal the major axis direction of the liquid crystal molecules changes by a tilt angle when a voltage is applied.
- the liquid crystal panel sandwiching the ferroelectric liquid crystal is sandwiched between two polarizing plates whose polarization axes are perpendicular to each other, and the transmitted light intensity is changed by using the birefringence due to the change in the long axis direction of the liquid crystal molecules.
- a ferroelectric liquid crystal having a half-V-shaped electro-optical response characteristic to an applied voltage is generally used as a liquid crystal material.
- FIG. 1 shows a driving sequence in a conventional field sequential liquid crystal display device
- FIG. 1 (a) shows a scanning timing of each line of the liquid crystal panel
- FIG. Figure 1 (b) shows the lighting timing of the red, green and blue colors of the backlight.
- One frame is divided into three subframes. For example, as shown in Fig. 1 (b), red light is emitted in the first subframe, and green light is emitted in the second subframe. In the third sub-frame, blue light is emitted.
- the image data is scanned twice in the liquid crystal panel during the red, green and blue subframes.
- the data write scan is performed with a polarity that can realize a bright display
- the polarity is opposite to that of the first data write scan.
- a voltage having substantially the same magnitude is applied.
- a darker display can be realized compared to the first data write scan, and it can be regarded as a substantially “black display”.
- the backlight (light source) should not be turned on during each subframe, but in synchronization with the end of the second data scan. And turning off the backlight (light source) so that the timing of turning off the backlight (light source) coincides with the end timing of the second data scan, thereby improving the light use efficiency and consumption of the backlight (light source). It is effective from the viewpoint of power.
- a liquid crystal material having spontaneous polarization such as a ferroelectric liquid crystal or an antiferroelectric liquid crystal having excellent responsiveness is used.
- the response is deteriorated due to the temperature drop, and there is a high possibility that the display unevenness is generated from the first area (upstream) to the last area (downstream) of the data scanning.
- This problem of display unevenness applies not only to the field sequential type liquid crystal display device but also to the color filter type liquid crystal display device. Disclosure of the invention
- the present invention has been made in view of such circumstances, and it is an object of the present invention to provide a liquid crystal display device capable of reducing power consumption without causing display unevenness.
- the liquid crystal display device is a liquid crystal display device according to the first aspect, wherein for each subframe obtained by dividing one frame corresponding to each of a plurality of colors, the light of the plurality of colors incident on the liquid crystal display element from the light source is sequentially output.
- a field sequential type liquid crystal display device which performs color display by synchronizing switching and data scanning of the liquid crystal display element based on display data of each color, the turning off of the light source is performed by the data scanning. Between the end timing of the subframe and the end timing of the subframe corresponding to the data scanning.
- the turning-off timing of the light source for sequentially switching the emission color for each sub-frame is defined as the end timing of the data scanning. They do not match and exist between the end of the overnight scan and the end of the subframe corresponding to that data scan. That is, the light source is turned off shortly after the data scanning is completed and before the next subframe.
- the liquid crystal display device provides a liquid crystal display device based on white light incident and display data by controlling turning on / off of a light source to a liquid crystal display element provided with a plurality of color filters for each frame.
- a color filter type liquid crystal display device that performs color display by synchronizing the overnight scanning with the liquid crystal display element, the turning off timing of the light source coincides with the end timing of the data scanning.
- the present invention is characterized in that it is between the end timing of the data scanning and the end timing of the frame corresponding to the data scanning.
- the timing of turning off the light source in each frame does not coincide with the end timing of data scanning, and the end timing of data scanning. Exists between the timing and the end of the frame corresponding to the data scan. That is, the light source is turned off shortly after the data scanning is completed and before the next frame.
- the response time from the transmission state of the liquid crystal to the light-shielding state becomes longer and the light source is turned off at the same time as the end of data scanning on the liquid crystal display element, the data is Since there is a predetermined time from scanning to turning off of the light source, the brightness rises in response to a longer response time from the liquid crystal transmission state to the light blocking state.
- downstream from data scanning the time from data scanning to turning off the light source As the response time from the transmission state of the liquid crystal to the light-shielding state is prolonged, there is no increase in luminance due to the short response time.
- a predetermined time is provided from the end of data scanning to the turning off of the light source without making the light source turning off timing coincide with the data scanning end timing. This suppresses display unevenness from upstream to downstream in data scanning. Further, in the first aspect, by turning off the light source before the end of the subframe, the display color does not deteriorate due to the color mixture.
- the liquid crystal display device is a liquid crystal display device, wherein one frame is divided into a plurality of sub-frames corresponding to each of a plurality of colors.
- a field sequential type liquid crystal display device which performs color display by synchronizing the switching and the data scanning of the liquid crystal display element based on the display data of each color, the turning off timing of the light source and the The first driving method in which the data scanning end timing matches the second driving method in which the light source turning-off timing does not match the data scanning end timing. It is characterized in that a color display is performed instead.
- the timing at which the light source is turned off and the timing at which the data scan ends are the same at each subframe. 1 drive method, light source turn-off timing and data scanning end timing at each subframe ⁇
- the liquid crystal display device provides a liquid crystal display device for each frame, which is based on the incidence of white light by turning on / off a light source to a liquid crystal display element provided with a plurality of color filters and a display data.
- a color filter type liquid crystal display device that performs color display by synchronizing data scanning with the liquid crystal display element, the turning off timing of the light source coincides with the end timing of the data scanning.
- a color display is performed by switching between a first driving method that is not used and a second driving method in which the light-off timing of the light source does not match the end timing of the data scanning.
- the first drive in which the turning-off timing of the light source and the end timing of the overnight scanning coincide in each frame.
- the first driving method (light-off timing and data scanning end timing) is used.
- the second driving method (light source turn-off timing and data scanning end timing do not match).
- a liquid crystal display device is the liquid crystal display device according to the second invention, in the second driving method, wherein the turning off timing of the light source is the same as the data scanning. It is characterized by being between an end timing and an end timing of a subframe corresponding to the data scanning.
- the timing of turning off the light source in each subframe in the second driving mode is defined as the end timing of data scanning. Provided between the end of the subframe corresponding to the data scan.
- a liquid crystal display device is the liquid crystal display device according to the fifth invention, in the second driving method, wherein the light-off timing of the light source corresponds to the end timing of the data scanning and the data scanning corresponds to the data scanning. Between the end of the frame and the end of the frame.
- the turning off timing of the light source in each frame in the second drive system is set to the end timing of data scanning and the frame corresponding to the data scanning. Between the end timing of
- the light source is turned off shortly after the data scanning is completed and before the next subframe or frame is reached.
- the light source is turned off.
- display unevenness is reliably suppressed.
- by turning off the light source before the end of the subframe different light source colors are not turned on at the same time. Does not occur.
- a liquid crystal display device is the liquid crystal display device according to the second, third, fifth, or sixth invention, wherein: a measuring means for measuring a temperature of the liquid crystal display element; Means for controlling switching between the first drive method and the second drive method.
- switching between the first driving method and the second driving method is controlled according to the temperature of the liquid crystal display element. Therefore easily suppresses display glare due to degradation of liquid crystal responsiveness caused by low-temperature environments.
- the first driving method and the second driving method are switched according to a response characteristic of the liquid crystal display element. It is characterized by having means for controlling
- liquid crystal display device In the liquid crystal display device according to the eighth aspect, switching between the first driving method and the second driving method is controlled in accordance with the response of the liquid crystal. Therefore, display unevenness due to the deterioration of the response of the liquid crystal is surely suppressed.
- FIG. 1 is a diagram showing a driving sequence in a conventional liquid crystal display device
- FIG. 2 is a block diagram showing an example of a circuit configuration of a liquid crystal display device (first embodiment) of the present invention
- FIG. FIG. 4 is a schematic cross-sectional view of a liquid crystal panel and a backlight of a field-sequential liquid crystal display device.
- FIG. 4 is a schematic diagram showing an example of the overall configuration of the liquid crystal display device of the present invention.
- the figure shows a driving sequence (first driving method) in the field sequential type liquid crystal display device of the present invention
- FIG. 6 shows the field sequential type liquid crystal display of the present invention.
- FIG. 7 is a diagram showing a drive sequence (second driving method) in a display device
- FIG. 7 is a graph showing a temperature dependence of a response time from a transmissive state to a light-shielded state of the liquid crystal display element, and FIG. Electricity of liquid crystal material used for Ming's liquid crystal display
- FIG. 9 is a block diagram showing an example of a circuit configuration of a liquid crystal display device (second embodiment) of the present invention
- FIG. 10 is a block diagram showing a color filter type liquid crystal display device.
- FIG. 11 is a schematic cross-sectional view of a liquid crystal panel and a backlight
- FIG. 11 is a diagram showing an example of a driving sequence in a color filter type liquid crystal display device of the present invention
- FIG. 9 is a diagram illustrating another example of the driving sequence in the liquid crystal display device. BEST MODE FOR CARRYING OUT THE INVENTION ''
- FIG. 2 is a block diagram showing a circuit configuration of the liquid crystal display device according to the first embodiment
- FIG. 3 is a schematic sectional view of a liquid crystal panel and a backlight
- FIG. 4 is an entire liquid crystal display device.
- FIG. 2 is a schematic diagram showing an example of the configuration of FIG. 2.
- the backlight 22 includes an LED array 7 and a light guide and light diffusing plate 6. As shown in FIGS.
- the polarizing film 1, the glass substrate 2, the common electrode 3, and the glass A substrate 4 and a polarizing film 5 are laminated in this order, and the surface of the glass substrate 4 on the side of the common electrode 3 is provided with pixel electrodes 40 and 40 arranged in a matrix. Is formed.
- a driving unit 50 including a data driver 32, a scan driver 33, and the like is connected between the common electrode 3 and the pixel electrodes 40, 40,....
- the data driver 32 is connected to TFT 41 via a signal line 42
- the scan driver 33 is connected to TFT 41 via a scanning line 43.
- the TFT 41 is turned on / off by the scan driver 33.
- Each of the pixel electrodes 40, 40,... Is connected to TFT 41. Therefore, the transmitted light intensity of each pixel is controlled by a signal from the data driver 32 supplied through the signal line 42 and the TFT 41.
- An alignment film 12 is provided on the upper surface of the pixel electrodes 40, 40,.
- An alignment film 11 is disposed on the lower surface of the common electrode 3, and a liquid crystal material is filled between the alignment films 11 and 12 to form a liquid crystal layer 13. This is a spacer for maintaining the layer thickness of the layer 13.
- the backlight 2 is provided with an LED array 7 which is located on the lower layer ( ⁇ surface) side of the liquid crystal panel 21 and faces the end surface of the light guide and light diffusion plate 6 which constitutes a light emitting area.
- This LED array 7 has, on the surface facing the light guide and light diffusing plate 6, 10 LEDs having a single chip of LED elements that emit three primary colors, that is, red, green and blue.
- the light guide and light diffusing plate 6 functions as a light emitting region by guiding light from each LED of the LED array 7 to the entire surface thereof and diffusing the light to the upper surface.
- This liquid crystal panel 21 is superimposed on a backlight 22 that can emit red, green, and blue light in a time-division manner.
- the lighting timing and light emission color of the backlight 12 are controlled in synchronization with the data writing scan based on the display data for the liquid crystal panel 21.
- reference numeral 31 denotes a control signal generation circuit which receives a synchronization signal SYN from a personal computer and generates various control signals CS required for display.
- Pixel data PD is output from the image memory unit 30 to the data driver 32. Based on the pixel data P D and the control signal C S for changing the polarity of the applied voltage, a voltage is applied to the liquid crystal panel 21 via the data driver 32 during a plurality of data write operations.
- the control signal CS is output from the control signal generator 31 to the reference voltage generator 34, the data driver 32, the scan driver 33, and the backlight control circuit 35, respectively.
- the reference voltage generation circuit 34 generates the reference voltages VR 1 and VR 2 and generates the generated reference voltages VR 1 and VR 2.
- the data driver 32 sends a signal to the signal line 42 of the pixel electrode 40 based on the pixel data PD from the image memory unit 30 and the control signal CS from the control signal generation circuit 31. Output.
- the scan driver 33 sequentially scans the scanning lines 43 of the pixel electrode 40 line by line.
- the backlight control circuit 35 applies the drive voltage to the backlight 12 and causes the backlight 22 to emit red light, green light and blue light, respectively.
- Reference numeral 36 denotes a thermometer for measuring the temperature of the liquid crystal panel 21.
- the thermometer 36 outputs a measured temperature value of the liquid crystal panel 11 to the backlight control circuit 35.
- the backlight control circuit 35 has a first driving method and a second driving method, and the first driving method and the second driving method are selected according to the temperature of the liquid crystal panel 11 measured by the thermometer 36. Either of the two driving methods is selected. Specifically, when the temperature of the liquid crystal panel 21 is higher than 15 ° C, the mode is switched to the first drive mode, and when the temperature of the liquid crystal panel 21 is 15 ° C or lower, the mode is switched to the second drive mode. .
- the first driving method is a driving method in which the turn-off timing of the backlight 22 (Lt: D element of each color) coincides with the end timing of data scanning.
- FIG. 5 shows a driving sequence in the first driving method.
- FIG. 5 (a) shows a scanning timing of each line of the liquid crystal panel 21 and
- FIG. 5 (b) shows a backlight timing. The lighting timings of red, green, and blue are shown.
- One frame (period: 1/6 Os) is divided into three subframes (period: 1/180 s), the first subframe emits red light, and the second subframe emits red light. The subframe emits green light and the third subframe emits blue light.
- the liquid crystal panel 21 performs two data scans during the red, green, and blue subframes. .
- a data write scan is performed with a polarity capable of realizing a bright display
- a voltage having a polarity opposite to that of the first data scan and having substantially the same magnitude is applied.
- a darker display can be realized than in the first data scan, and it can be virtually regarded as “black display”.
- the backlight 22 is turned off in synchronization with the end timing of the second data scan.
- the second driving method is a driving method in which the turning-off timing of the backlight 12 (LED element of each color) does not match the end timing of the data scanning.
- FIG. 6 shows a drive sequence in the second drive system.
- FIG. 6 (a) shows a scanning timing of each line of the liquid crystal panel 21 and
- FIG. 6 (b) shows a back light. 22 The lighting timings of red, green, and blue are shown.
- the turn-off timing of the backlight 22 is not synchronized with the end timing of the second data scan, and is set at 500 s from the end timing of the second data scan. Just shifted backwards.
- backlight 22 is turned off before the end timing of the subframe.
- the backlight turning off timing of the backlight 22 is provided between the end timing of the second data scan and the end timing of the subframe corresponding to this data scan. .
- FIG. 7 is a graph showing the temperature dependence of the response time from the transmissive state to the light-shielded state of the liquid crystal display element.
- the horizontal axis represents the temperature (° C.) of the liquid crystal display element
- the vertical axis represents the response time ( ⁇ off: s).
- the response time becomes longer as the temperature of the liquid crystal display element becomes lower. For example, when the temperature is 15 ° C., the response time is 200 s.
- the time between the end timing of the second data scan and the turn-off timing of the backlight 22 is set to be sufficiently longer than 200 s. ⁇ s.
- the pixel data PD for display is input from the personal computer to the image memory unit 30.
- the image memory unit 30 temporarily stores the pixel data PD and then outputs the pixel data PD from the control signal generation circuit 31.
- the pixel data PD is output when the output control signal CS is received.
- the control signal CS generated by the control signal generating circuit 31 is supplied to the data driver 32, the scan driver 33, the reference voltage generating circuit 34, and the backlight control circuit 35.
- the reference voltage generation circuit 34 generates the reference voltages V R 1 and V R 2 when receiving the control signal C S, and supplies the generated reference voltage V R 1 to the data driver 32 to supply the reference voltage V R? Are output to the scan drivers 33 respectively.
- the data driver 32 When receiving the control signal CS, the data driver 32 outputs a signal to the signal line 42 of the pixel electrode 40 based on the pixel data PD output from the image memory unit 30.
- the scan driver 33 When receiving the control signal C S, the scan driver 33 sequentially scans the scanning lines 43 of the pixel electrode 40 line by line.
- the TFT 41 is driven in accordance with the output of the signal from the data driver 32 and the scanning of the scan driver 33, a voltage is applied to the pixel electrode 40, and the transmitted light intensity of the pixel is controlled.
- the backlight control circuit 35 When receiving the control signal CS, the backlight control circuit 35 applies a driving voltage to the backlight 12 to apply the driving voltage to the red, green, and blue colors of the LED array 7 of the backlight 22.
- Each color LED element emits light in a time-division manner, and sequentially emits red light, green light, and blue light over time.
- the measured temperature value of the liquid crystal panel 21 is input from the thermometer 36 to the backlight control circuit 35, and the first drive method (see Fig. 5) or the second drive method is selected according to the measured temperature value.
- Drive system using any of the drive methods see Fig. 6) —The backlight 22 (LED element of each color) is turned off according to the ground.
- a ferroelectric liquid crystal exhibiting a half V-shaped electro-optical response characteristic when driving a TFT as shown in FIG. did.
- the magnitude of spontaneous polarization of the encapsulated ferroelectric liquid crystal was 8 nC / cm 2 .
- the maximum angle between the average molecular axis of the liquid crystal molecules when no voltage was applied and the average molecular axis of the liquid crystal molecules when voltage was applied was 30 ° on one side.
- the liquid crystal panel 21 was formed by sandwiching the fabricated panel between two polarizing films 1 and 5 in a crossed Nicol state so that a dark state was obtained when no voltage was applied.
- the liquid crystal panel 21 manufactured in this manner is superimposed on the back light 12 using the LED array 7 as a light source capable of monochromatic red, green, and blue light emitting switching.
- the driving sequence as shown in Fig. 5 by the LCD or the driving sequence as shown in Fig. 6 by the second driving method is switched in accordance with the temperature of the liquid crystal panel 21, and the field sequence is changed. A color display was performed using the initial method.
- the delay time for turning off the backlight 12 in the second drive method is set to one of 500 0s, but based on the characteristics shown in the graph of FIG.
- a plurality of types of delay times may be provided in advance, and color display may be performed in accordance with a drive sequence based on any one of the delay times switched according to the temperature of the liquid crystal panel 21.
- FIG. 9 is a block diagram showing a circuit configuration of the liquid crystal display device according to the second embodiment.
- the same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.
- the drive sequence is switched according to the temperature of the liquid crystal panel 21.
- the driving state of the liquid crystal panel 21 is changed from the transmission state to the light shielding state. Switch the drive sequence according to the response time.
- reference numeral 37 denotes a photosensor provided in the liquid crystal panel 21.
- the photosensor 37 is a response from the transmissive state of the liquid crystal panel 1 to the light-shielded state.
- the time is detected, and the detection result is output to the backlight control circuit 35.
- a drive sequence as shown in FIG. 1 (all lights up during the subframe) is set, and the transmission of the liquid crystal panel 21 at that time is performed.
- the response time from the state to the light shielding state is detected by the photo sensor 37.
- the backlight control circuit 35 adjusts the time from the end of the data scanning to the timing of turning off the backlight 22.
- a liquid crystal panel 21 manufactured in the same process as in the first embodiment is superimposed on a back light 12 using a LED array 7 capable of monochromatic surface emission switching of red, green, and blue as a light source.
- the timing of the end of the data scanning and the turning off time of the backlight 22 are determined. While adjusting the time until the mining, a color display by the field sequential method was performed. As a result, the time from the end of data scanning to the timing of turning off the backlight 22 can be finely adjusted, and a uniform color display is always displayed within the operating range. It was realized.
- the liquid crystal panel fabricated in the same process as in the first embodiment is superimposed on a backlight that uses an LED array capable of monochromatic surface light switching of red, green, and blue as a light source. Regardless of the above, the color display by the field-sequential method was performed according to the drive sequence as shown in Fig. 5.
- the light source used is the LED light source.
- the light source is not particularly limited to the LED light source as long as it is a light source such as EL (Electronic Luminescence) or a cold cathode tube.
- EL Electro Luminescence
- the liquid crystal display element a transmission type liquid crystal display element is used, but a reflection type liquid crystal display element may be used.
- the liquid crystal display device of the field-sequential type has been described as an example.
- a similar effect can be obtained in a liquid crystal display device of the color filter type provided with a color filter.
- Can be The reason is that the sub-frame in the field sequential method is used. This is because the present invention can be performed in the same manner by applying the drive sequence in the above to a frame in the color filter system.
- FIG. 10 is a schematic sectional view of a liquid crystal panel and a backlight in a color filter type liquid crystal display device.
- the common electrode 3 is provided with color filters 60, 60... Of three primary colors (R, G, B).
- the backlight 22 includes a white light source 70 having one or a plurality of white light source elements that emit white light, and a light guide and light diffusion plate 6. In such a color filter type liquid crystal display device, white light emitted from a white light source 70 is selectively transmitted through a plurality of color filters 60. Color display.
- the temperature or response characteristic of the liquid crystal panel (the response time from the transmissive state to the light-shielded state of the liquid crystal panel) is determined, and according to the determined temperature or response characteristic.
- the drive sequence as shown in Fig. 11 (the timing of turning off the backlight 22 (white light source 70) coincides with the end timing of data scanning) and Fig. 12
- the drive sequence shown in the figure (the timing of turning off the backlight 11 (white light source 70) and the timing of terminating the data scanning do not match) is switched to perform color display. For example, even in the case of a color filter type liquid crystal display device, it is possible to achieve both suppression of display unevenness and low power consumption, as in the above-described field sequential type liquid crystal display device. This has the effect.
- the turning-off timing of the light source does not match the end timing of the data scan, and the end timing of the data scan is not performed. Since it is set between the end of the subframe corresponding to the data scanning and the end timing of the subframe corresponding to the data scanning, display unevenness from upstream to downstream of the data scanning can be suppressed. Further, in the field-sequential system, it is possible to prevent the display color from deteriorating due to the color mixture. Also, in the present invention, the timing of turning off the light source and terminating the data scanning are provided.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003252386A AU2003252386A1 (en) | 2003-08-04 | 2003-08-04 | Liquid crystal display device |
JP2005507403A JP4020928B2 (ja) | 2003-08-04 | 2003-08-04 | 液晶表示装置 |
CNB038267527A CN100401141C (zh) | 2003-08-04 | 2003-08-04 | 液晶显示装置 |
PCT/JP2003/009893 WO2005012985A1 (ja) | 2003-08-04 | 2003-08-04 | 液晶表示装置 |
TW093115504A TWI284219B (en) | 2003-08-04 | 2004-05-31 | Liquid crystal display device |
US11/296,048 US20060092186A1 (en) | 2003-08-04 | 2005-12-07 | Liquid crystal display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2003/009893 WO2005012985A1 (ja) | 2003-08-04 | 2003-08-04 | 液晶表示装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/296,048 Continuation US20060092186A1 (en) | 2003-08-04 | 2005-12-07 | Liquid crystal display device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005012985A1 true WO2005012985A1 (ja) | 2005-02-10 |
Family
ID=34113491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/009893 WO2005012985A1 (ja) | 2003-08-04 | 2003-08-04 | 液晶表示装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060092186A1 (ja) |
JP (1) | JP4020928B2 (ja) |
CN (1) | CN100401141C (ja) |
AU (1) | AU2003252386A1 (ja) |
TW (1) | TWI284219B (ja) |
WO (1) | WO2005012985A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007093651A (ja) * | 2005-09-27 | 2007-04-12 | Hitachi Displays Ltd | 液晶表示装置 |
JP2008083427A (ja) * | 2006-09-28 | 2008-04-10 | Mitsubishi Electric Corp | 液晶表示装置 |
JP2008249875A (ja) * | 2007-03-29 | 2008-10-16 | Stanley Electric Co Ltd | 液晶表示装置 |
CN101604510B (zh) * | 2008-06-14 | 2012-07-04 | 陈国平 | 场序驱动彩色液晶显示装置的驱动方法 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20070080660A (ko) * | 2006-02-08 | 2007-08-13 | 삼성전자주식회사 | 표시 패널과, 이를 구비한 표시 장치 |
CN100464219C (zh) * | 2007-03-28 | 2009-02-25 | 友达光电股份有限公司 | 具背光时间延迟控制的色序式显示器及其控制方法 |
KR20080101680A (ko) * | 2007-05-18 | 2008-11-21 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 액정 표시장치, 전자 기기, 및 그의 구동방법 |
US9129563B2 (en) * | 2010-10-28 | 2015-09-08 | Hewlett-Packard Development Company, L.P. | System and method for timing adjustment of a backlight module |
CN115657372A (zh) * | 2022-11-04 | 2023-01-31 | 武汉华星光电技术有限公司 | 显示装置及电子设备 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6151004A (en) * | 1996-08-19 | 2000-11-21 | Citizen Watch Co., Ltd. | Color display system |
JP2000338464A (ja) * | 1998-06-24 | 2000-12-08 | Canon Inc | 表示素子、液晶素子、液晶装置、及び表示装置の駆動方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0383015A (ja) * | 1989-08-28 | 1991-04-09 | Tokyo Electron Ltd | 表示装置 |
JP3371200B2 (ja) * | 1997-10-14 | 2003-01-27 | 富士通株式会社 | 液晶表示装置の表示制御方法及び液晶表示装置 |
JP3689583B2 (ja) * | 1999-03-16 | 2005-08-31 | キヤノン株式会社 | 液晶装置及び液晶装置の駆動方法 |
JP3712046B2 (ja) * | 2000-05-30 | 2005-11-02 | 富士通株式会社 | 液晶表示装置 |
JP2003050569A (ja) * | 2000-11-30 | 2003-02-21 | Hitachi Ltd | 液晶表示装置 |
TW546624B (en) * | 2001-03-30 | 2003-08-11 | Matsushita Electric Ind Co Ltd | Display device |
TW575849B (en) * | 2002-01-18 | 2004-02-11 | Chi Mei Optoelectronics Corp | Thin film transistor liquid crystal display capable of adjusting its light source |
-
2003
- 2003-08-04 JP JP2005507403A patent/JP4020928B2/ja not_active Expired - Fee Related
- 2003-08-04 WO PCT/JP2003/009893 patent/WO2005012985A1/ja active Application Filing
- 2003-08-04 CN CNB038267527A patent/CN100401141C/zh not_active Expired - Fee Related
- 2003-08-04 AU AU2003252386A patent/AU2003252386A1/en not_active Abandoned
-
2004
- 2004-05-31 TW TW093115504A patent/TWI284219B/zh not_active IP Right Cessation
-
2005
- 2005-12-07 US US11/296,048 patent/US20060092186A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6151004A (en) * | 1996-08-19 | 2000-11-21 | Citizen Watch Co., Ltd. | Color display system |
JP2000338464A (ja) * | 1998-06-24 | 2000-12-08 | Canon Inc | 表示素子、液晶素子、液晶装置、及び表示装置の駆動方法 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007093651A (ja) * | 2005-09-27 | 2007-04-12 | Hitachi Displays Ltd | 液晶表示装置 |
JP4692996B2 (ja) * | 2005-09-27 | 2011-06-01 | 株式会社 日立ディスプレイズ | 表示装置 |
JP2008083427A (ja) * | 2006-09-28 | 2008-04-10 | Mitsubishi Electric Corp | 液晶表示装置 |
JP2008249875A (ja) * | 2007-03-29 | 2008-10-16 | Stanley Electric Co Ltd | 液晶表示装置 |
CN101604510B (zh) * | 2008-06-14 | 2012-07-04 | 陈国平 | 场序驱动彩色液晶显示装置的驱动方法 |
Also Published As
Publication number | Publication date |
---|---|
TW200506447A (en) | 2005-02-16 |
AU2003252386A1 (en) | 2005-02-15 |
CN100401141C (zh) | 2008-07-09 |
US20060092186A1 (en) | 2006-05-04 |
JPWO2005012985A1 (ja) | 2006-09-21 |
TWI284219B (en) | 2007-07-21 |
CN1802596A (zh) | 2006-07-12 |
JP4020928B2 (ja) | 2007-12-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4493274B2 (ja) | 表示装置及び表示方法 | |
JP4169589B2 (ja) | 表示装置及び表示方法 | |
KR101017311B1 (ko) | 액정 표시 장치 | |
US6570554B1 (en) | Liquid crystal display | |
JP3912999B2 (ja) | 表示装置 | |
JP3584351B2 (ja) | 液晶表示装置 | |
US8009249B2 (en) | Liquid crystal display device | |
WO2007043148A9 (ja) | 液晶表示装置及び表示方法 | |
JP4353942B2 (ja) | 液晶表示装置 | |
US20080018588A1 (en) | Liquid crystal display device | |
US20060092186A1 (en) | Liquid crystal display device | |
JP3948914B2 (ja) | 液晶表示素子 | |
JP3859524B2 (ja) | 液晶表示素子の駆動方法及び液晶表示装置 | |
WO2007032054A1 (ja) | 表示方法及び表示装置 | |
JP2004126470A (ja) | 表示装置及び表示方法 | |
JP4248268B2 (ja) | 液晶表示装置 | |
JP2003270669A (ja) | 液晶表示装置 | |
WO2006114859A1 (ja) | 液晶表示装置 | |
JP5003767B2 (ja) | 表示装置及び表示方法 | |
JP4342594B2 (ja) | 表示装置 | |
KR100858454B1 (ko) | 액정 표시 장치 | |
WO2005122127A1 (ja) | 液晶表示装置 | |
WO2007029334A1 (ja) | 液晶表示装置 | |
JP3659964B2 (ja) | 液晶表示装置 | |
JP2006323418A (ja) | 表示装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 03826752.7 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005507403 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11296048 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020057024433 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 1020057024433 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 11296048 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |