WO2004066021A1 - 表示装置および表示方法、液晶駆動回路および液晶駆動方法 - Google Patents
表示装置および表示方法、液晶駆動回路および液晶駆動方法 Download PDFInfo
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- WO2004066021A1 WO2004066021A1 PCT/JP2004/000482 JP2004000482W WO2004066021A1 WO 2004066021 A1 WO2004066021 A1 WO 2004066021A1 JP 2004000482 W JP2004000482 W JP 2004000482W WO 2004066021 A1 WO2004066021 A1 WO 2004066021A1
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- drive
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- 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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3622—Control of matrices with row and column drivers using a passive matrix
- G09G3/3629—Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0469—Details of the physics of pixel operation
- G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
- G09G2300/0482—Use of memory effects in nematic liquid crystals
- G09G2300/0486—Cholesteric liquid crystals, including chiral-nematic liquid crystals, with transitions between focal conic, planar, and homeotropic states
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- 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
- G09G2310/0264—Details of driving circuits
- G09G2310/0278—Details of driving circuits arranged to drive both scan and data electrodes
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- 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
-
- 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
- G09G2310/063—Waveforms for resetting the whole screen at once
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- 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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Definitions
- Display device and display method liquid crystal drive circuit and liquid crystal drive method
- the present invention relates to a display device and a display method, a liquid crystal drive circuit and a liquid crystal drive method, and more particularly, to a display device and a display method suitable for displaying information using cholesteric liquid crystal, a liquid crystal drive circuit and a liquid crystal drive
- the present invention relates to a method, a program, and a recording medium.
- liquid crystal display devices for example, simple matrix type TN (Twisted Nematic) liquid crystal, STN (Super Twisted Nematic) liquid crystal, TFT (Thin Fi lm Transistor) liquid crystal using active matrix type liquid crystal, MIM (Metal In Metal) liquid crystal are used.
- TN Transmission Nematic
- STN Super Twisted Nematic
- TFT Thin Fi lm Transistor
- MIM Metal In Metal
- the simple matrix method In the simple matrix method, X electrodes and Y electrodes are arranged in a lattice, and the liquid crystal at the intersection is driven by timing and performing 0N / 0FF on these electrodes.
- the liquid crystal display device using the simple matrix method is less expensive than products using the active matrix method because it has few electrodes and is easy to manufacture.
- the simple matrix method since the electrodes of the liquid crystal cells constituting the pixel are not independent, the voltage interferes to affect the surrounding cells, and it is difficult to clearly display each pixel.
- the active matrix method in contrast to the simple matrix method, display is performed by switching on and off for each pixel (by driving the liquid crystal by adding an active element corresponding to each pixel). It is.
- the active matrix method is superior to the simple matrix method in terms of performance such as faster reaction speed, less residual image, and wide viewing angle, but it is expensive to manufacture.
- the state transitions by the applied voltage transitions by the applied voltage (planar state and focal conic state), and information is displayed using this. Furthermore, it is possible to hold the information once displayed without supply of power (eg, published by The Nikkan Kogyo Shimbun, "Liquid crystal device handbook", published on September 29, 1989, 3 52 pages to 35 5 pages).
- the cholesteric liquid crystal selectively reflects light of a wavelength corresponding to the distance between the liquid crystal helical layers in the planar state, and is almost transparent in the focal state.
- FIG. 1 is a cross-sectional view of the cholesteric liquid crystal panel 1
- FIG. 2 is a diagram for describing a configuration of two electrodes of the cholesteric liquid crystal panel 1.
- Transparent column electrodes (ITO: Indium Tin Oxide) 12 are vapor-deposited (or sputtered) in stripes on the glass substrate 11 1, and transparent row electrodes (ITO: Indiura) are formed on the glass substrate 1-2.
- Tin Oxi de) 15 is deposited (or sputtered) in stripes.
- Polyimide layers 13-1 and 13-2 are formed.
- the stripes of the transparent column electrode 12 and the transparent mouth electrode 15 cross each other on the glass substrate 11-1 and the glass substrate 11 12 on which the electrodes are provided.
- Gears facing one another through polyimide layers 1 and 2 They are bonded together with a gap thickness of / m (for example, about 5 / m) by using a grinding material.
- the cholesteric liquid crystal is injected between the gaps of the glass substrate 11 and the glass substrate 11 by, for example, a vacuum injection method or the like to form the cholesteric liquid crystal film 14.
- the cholesteric liquid crystal panel 1 does not require alignment of a polyimide layer or provision of a polarizing plate on a glass substrate, as in, for example, a commonly used TN (Twisted Nematic) liquid crystal.
- Cholesteric liquid crystals have a special helical structure (helical structure) as a molecular structure, and the state changes because the helical structure changes according to the value of the applied bipolar pulse voltage.
- the cholesteric liquid crystal can take two stable states, a focal conic state and a planar state, depending on the value of the applied bipolar pulse voltage.
- the planar state is a state in which interference scattering is performed on a specific wavelength band of light
- the focal conic state is a state in which light is transmitted across a wide band.
- the cholesteric liquid crystal panel 1 according to the first color determined based on the wavelength band reflected in the planar state and the second color seen through the liquid crystal when it is transparent in the focal conic state, Information can be displayed. That is, in the cholesteric liquid crystal panel 1, for example, in the planar state, the cholesteric liquid crystal diffusely reflects light of a specific wavelength band, and under the cholesteric liquid crystal layer 14 is black, the black in the focal conic state is By making it transparent and visible, it becomes possible to display a monotone display of a specific wavelength color and black.
- the voltage value V ps of the bipolar pulse voltage required to change the state of the cholesteric liquid crystal to the planar state is the voltage of the bipolar pulse voltage necessary to change to the focal conic state.
- the voltage value is almost twice that of the value V fs.
- Cholesteric liquid crystal can hold a given pixel electrode if a bipolar pulse voltage is applied to bring it into a focal conic state or a planar state, and if the voltage is not applied thereafter.
- the cholesteric liquid crystal can change the state again as needed depending on the voltage value when the bipolar pulse voltage is applied again.
- FIG. 4 is an example of a drive voltage waveform applied to the pixel electrode when the display of a predetermined pixel of the cholesteric liquid crystal panel 1 is changed.
- a bipolar pulse of voltage V ps when a bipolar pulse of voltage V ps is applied to a predetermined pixel electrode, a planar state is established, so that the display color is the first color, and in the planar state, the predetermined color is applied to the predetermined pixel electrode.
- V fs bipolar pulse of voltage
- the entire display surface is changed to the planar state, and the displayed information is reset.
- a bipolar pulse of a voltage value V fs to the pixel electrode at the position to change the state to the focal conic state, predetermined information is displayed, and thereafter, information is displayed by applying no voltage. Information can be held.
- FIG. 5 is a block diagram showing a configuration example of a conventional liquid crystal drive circuit 21 for driving the cholesteric liquid crystal panel 1.
- the cholesteric liquid crystal panel 1 will be described as displaying information of n ⁇ m pixels.
- the column driver 31 receives a clock (CLK) signal and a data (DATA) signal indicating information to be displayed on the cholesteric liquid crystal panel 1, and is connected to the drive voltage soil V 2 and GND (0 V). It is a driver for applying a predetermined voltage to the column (signal) electrodes Y 1 to Y n of the transparent column electrode 12 of the liquid crystal panel 1 at a predetermined timing described later with reference to FIG.
- the row driver 32 receives the supply of the clock (CLK) signal, and is connected to the common GND and the GND supplied to the drive voltage soil VI and the column driver 31, and the transparent row electrode 1 of the cholesteric liquid crystal panel 1 It is a driver that applies a predetermined voltage to the row (scan) electrodes 5 to 5 at a predetermined timing described later with reference to FIG.
- the drive voltage V 1 and the drive voltage V 2 are voltage values that satisfy V 1 + V 2 VVp s.
- 9 pixels of 3 ⁇ 3 are displayed in 2 colors (2 colors of a specific wavelength color and black, for example, when a specific wavelength color is white, displayed in 2 colors of white and black) A concrete example will be described.
- the display of the specific wavelength color is a state in which the light of the specific wavelength color is interference and scattered by the cholesteric liquid crystal in the planar state, and the black display is transparent through the transparent cholesteric liquid crystal in the focal conic state. It is in the displayed state.
- FIG. 7 and 8 are timing charts for explaining the operation of the column driver 31 and the row driver 32.
- FIG. FIG. 7 shows the voltage of the bipolar pulse applied to the column electrodes XI to X 3 by the column dyno 31 to display information of 9 pixels of 3 ⁇ 3 as shown in FIG. 6 on the cholesteric liquid crystal 1.
- FIG. 8 is a timing chart for explaining the timing and the voltage and timing of the bipolar pulse applied by the mouth driver 32 to the row electrodes Y 1 to Y 3, and FIG. 8 is described with reference to FIG. 7.
- the cholesteric liquid crystal layer 14 between the two electrodes of the transparent column electrode 12 and the transparent mouth electrode 15 is in a planar state, and interference scattering of specific wavelength light is performed.
- the pixels (XI, Y 1) to (X 3, Y 3) all display a specific wavelength color (hereinafter referred to as all planar reset).
- the row driver 32 scans and applies a bipolar pulse of voltage V 3 from the row electrode XI sequentially with the row electrode X 2, the row electrode X 3, and the voltage V 3. Select one of the row electrodes. Then, the column driver 31 selectively applies a bipolar pulse having a reverse characteristic V 4 to the column electrode Y 1 to the column electrode Y 3 in accordance with the selection timing of the row electrode.
- a bipolar pulse voltage of V 3 + V 4> V fs is applied to the six pixels of (X 3, Y 2) and (X 3, Y 3).
- the cholesteric liquid crystal layer 14 between the two electrodes of the transparent column electrode 12 and the transparent row electrode 15 at the position is in the focal conic state and becomes transparent. That is, the six pixels of (XI, Y1), (XI, Y2), (X2, Y2), (X2, Y3), (X3, Y2), (X3, Y3) are displayed in black. Be done.
- Vp s is almost twice as large as the voltage value V f s, and therefore V 1 + V 2> V 3 + V 4 holds.
- a driver for driving a cholesteric liquid crystal needs to have a very high withstand voltage, while a normal TN liquid crystal can be driven with a few volts, so the drive circuit and battery can be miniaturized and the cost can be reduced. Was very difficult. Disclosure of the invention
- the present invention has been made in view of such a situation, and is to realize a low voltage drive circuit for driving a cholesteric liquid crystal.
- a voltage is applied to the first electrode and the second electrode to change the state of the cholesteric liquid crystal to display information, and a voltage is applied to the first electrode. Operation of the first driving means, the second driving means for applying a voltage to the second electrode, the operation of the first driving means and the second driving means, and the first driving means.
- Control means for controlling the voltage value of the first reference voltage and the voltage value of the second reference voltage supplied to the second driving means, and the control means, when making the cholesteric liquid crystal into the planar state, First driving means so that the first driving means applies a first reference voltage to the first electrode, and the second driving means applies a second reference voltage to the second electrode; Control the operation of the driving means of the The voltage values of the first reference voltage and the second reference voltage are controlled so that the crystal can obtain the planar state.
- the first drive means may be supplied with a first drive voltage having a voltage value different from that of the first reference voltage.
- the second drive means can be made to receive supply of a second drive voltage having a voltage value different from that of the first reference voltage, and the control means sets the cholesteric liquid crystal in the focal co-ck state.
- the first drive means applies the first drive voltage to the first electrode
- the second drive means applies the second drive voltage to the second electrode.
- the operation of the second drive means can be controlled.
- First switching means for selectively switching the voltage value of the first reference voltage supplied to the first drive means between the first voltage value and OV, and second for the second drive means It is possible to further provide a second switching means for selectively switching the voltage value of the reference voltage between the second voltage value and the voltage OV, and the control means is configured to planarize the cholesteric liquid crystal.
- the first drive means applies the first reference voltage to the first electrode
- the second drive means applies the second reference voltage to the second electrode.
- the first switching means and the first switching means so that the voltage value of the second reference voltage becomes the second voltage value.
- the second switching means can be further controlled.
- the display means may comprise a plurality of cholesteric liquid crystals which reflect light of different wavelength bands in the planar state.
- a first reference voltage application step of applying a first reference voltage to a first electrode and a second reference voltage application step of applying a second reference voltage to a second electrode.
- a first reference voltage control step for controlling the voltage value of the first reference voltage a second reference voltage control step for controlling the voltage value of the second reference voltage, a first electrode and a second The first drive different from the first reference voltage and the second reference voltage on the electrode
- the first reference voltage is applied to the first electrode
- the second reference voltage is applied to the second electrode
- the voltage value of the first reference voltage is controlled.
- the voltage value of the second reference voltage is controlled to change the cholesteric liquid crystal to the planar state.
- the liquid crystal drive circuit of the present invention comprises: a first drive means for applying a voltage to a first electrode of a liquid crystal display element; a second drive means for applying a voltage to a second electrode of the liquid crystal display element; Operation of the second driving means, and a voltage value of the first reference voltage supplied to the first driving means and a voltage of the second reference voltage supplied to the second driving means Control means for controlling the value, and in the case where the cholesteric liquid crystal is in the planar state, the first drive means applies a first reference voltage to the first electrode, and the second drive means controls the value. While controlling the operation of the first drive means and the second drive means so as to apply the second reference voltage to the second electrode, the cholesteric liquid crystal can obtain the planar state; Control the voltage value of the second reference voltage and the second reference voltage Do.
- the liquid crystal driving method of the present invention comprises: a first reference voltage application step of applying a first reference voltage to a first electrode; and a second reference voltage application step of applying a second reference voltage to a second electrode.
- the first reference voltage is applied to the first electrode
- the second reference voltage is applied to the second electrode
- the voltage value of the second reference voltage is controlled
- the cholesteric liquid crystal is changed to the planar state.
- FIG. 1 is a diagram for explaining a cholesteric liquid crystal panel.
- FIG. 2 is a diagram for explaining a cholesteric liquid crystal panel.
- FIG. 3 is a diagram for explaining the state of the cholesteric liquid crystal and the applied bipolar pulse voltage.
- FIG. 4 is a diagram showing drive waveforms for cholesteric liquid crystals.
- FIG. 5 is a block diagram showing a conventional liquid crystal drive circuit.
- FIG. 6 is a diagram showing an example of data to be displayed.
- FIG. 7 is a timing chart showing voltages applied to the row electrode and the column electrode in the liquid crystal drive circuit of FIG.
- FIG. 8 is a timing chart showing the bipolar pulse voltage applied between the electrodes of each pixel of the cholesteric liquid crystal panel in the liquid crystal drive circuit of FIG.
- FIG. 9 is a block diagram showing a liquid crystal drive circuit to which the present invention is applied.
- FIG. 10 is a timing chart showing the voltages applied to the row electrode and the column electrode and the G N D level in the liquid crystal drive circuit of FIG.
- FIG. 11 is a timing chart showing a bipolar pulse voltage applied between the electrodes of each pixel of the cholesteric liquid crystal panel in the liquid crystal drive circuit of FIG.
- FIG. 12 is a flowchart for explaining the process of the liquid crystal drive circuit of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 9 is a block diagram showing a configuration of a liquid crystal drive circuit 41 to which the present invention is applied for driving the cholesteric liquid crystal panel 1.
- the cholesteric liquid crystal panel 1, the liquid crystal drive circuit 41, and a power supply (not shown) (for example, a battery) constitute a liquid crystal display device.
- the cholesteric liquid crystal panel 1 is similar to the conventional cholesteric liquid crystal panel described with reference to FIGS. 1 to 4.
- the cholesteric liquid crystal panel 1 when a bipolar pulse is applied such that the potential difference between the pixel electrodes is V ps or more, the cholesteric liquid crystal in the portion corresponding to the pixel position is in the planar state.
- the corresponding pixels are displayed in a first color determined based on the wavelength band reflected in the planar state.
- the cholesteric liquid crystal panel 1 when a bipolar pulse is applied such that the potential difference between the pixel electrodes is V fs or more, the cholesteric liquid crystal in the portion corresponding to the pixel position is in the focal conic state.
- the corresponding pixel is displayed in a second color that can be seen through the liquid crystal.
- the cholesteric liquid crystal diffusely reflects light of a specific wavelength color in the planar state, and black under the cholesteric liquid crystal layer 14 is blackened in the transparent state.
- the first color determined based on the wavelength band reflected in the planar state ie, The specific wavelength color may be any color, for example, green, blue, red, etc.
- the second color seen through the liquid crystal may be any color.
- the voltage value V ps of the bipolar pulse voltage required to change the state of the cholesteric liquid crystal to the planar state is the bipolar pulse voltage required to change to the focal conic state.
- the voltage value of V fs is almost twice that of V.
- the cholesteric liquid crystal panel 1 needs, for example, after resetting the displayed information with the entire display surface being in the planar state (all planar reset) by applying a bipolar pulse of voltage value V ps to the entire surface of the panel.
- a bipolar pulse of a voltage value V fs to the pixel electrode at a proper position to change the state to the focal coach state, predetermined information is displayed, and thereafter a voltage is not applied. Hold the indicated information.
- the controller 51 controls the column driver 52 and the oral driver 53, and the data (DATA) indicating the information to be displayed on the clock (CLK) signal and the cholesteric liquid crystal panel 1 in the column driver 52 Supply and supply clock (CLK) signal to low driver 53.
- the controller 51 controls the switching of the switches 54 and 55 to control the GND c, which is a reference voltage supplied to the column driver 52, and the GND, which is a reference voltage connected to the mouth driver 53.
- the voltage value of r is switched at a predetermined timing.
- the column driver 52 receives a clock (CLK) signal and a data (DATA) signal for displaying information on the cholesteric liquid crystal panel 1 from the controller 51, and also provides a drive voltage V4 and a reference voltage. Under the control of the controller 51, the column (signal) electrodes Y1 to Yn of the transparent column electrodes 12 of the cholesteric liquid crystal panel 1 are connected to the GND c at a predetermined timing described later with reference to FIG. It is a driver that applies a predetermined voltage.
- the row driver 53 receives the supply of the clock (CLK) signal from the controller 51 and is connected to the drive voltage soil V 3 and the reference voltage GND r, and according to the control of the controller 51, the cholesteric liquid crystal panel 1 It is a driver that applies a predetermined voltage to the row (scanning) electrodes XI to Xm of the transparent mouth electrode 15 at a predetermined timing described later with reference to FIG.
- the voltage (one V 1 ⁇ V 2) connected to the reference voltage GND c or the voltage (V 1 + V 2) connected to the reference voltage GND r by switching of switch 54 and switch 55 is V It is a voltage value which satisfies 1 + V 2> V ps. Also, columned The voltage V 4 supplied to the driver 52 and the voltage V 3 supplied to the mouth driver 5 3 satisfy V 3 + V 4> V fs and have voltage values satisfying V fs> V 3 and V fs> V 4 .
- Switch 54 and switch 5 5 are, for example, F ET (Field Effect
- Transistor consists of switching elements such as field effect transistors).
- the switch 54 switches the voltage value of the reference voltage GND c connected to the column driver 52 between (_V 1 _V 2) and GND (0 V) based on the control of the controller 51.
- the switch 55 switches the voltage value of the reference voltage GND r supplied to the port driver 53 between (V 1 + V 2) and GND (0 V) based on the control of the controller 51.
- the drive 56 is connected to the controller 51, if necessary.
- a magnetic disk 61, an optical disk 62, a magneto-optical disk 63, or a semiconductor memory 64 is attached to the drive 56 so that information can be transmitted and received.
- (X 1, Y 1) (X 1, 1 as shown in Fig. 6).
- Y2) (X2, Y2) (X2, Y3) (X3, Y2)
- Six pixels of (X3, Y3) are black, and the other pixels are a specific wavelength color, 3
- the column driver 52 is used to display the information of 9 pixels of 3 ⁇ 3 as shown in FIG.
- the voltage and timing of the bipolar pulse applied to the column electrodes X 1 to X 3 and the row driver 53 apply to the row electrodes Y 1 to Y 3
- Fig. 1 1 is a timing chart to explain the voltages given to reference voltage GND c and reference voltage GND r by switching of switches 54 and 55 in addition to the voltage and timing of the bipolar pulse, and the timings thereof.
- Is a timing chart for explaining the bipolar pulse applied to each of 3 ⁇ 3 9 pixels (X 1, Y 1) to (X 3, Y 3) by the applied voltage described using FIG. It is a teammate.
- the controller 54 controls the switch 54 and the switch 55, and the GND c supplied to the column driver 52 and the GND r supplied to the row driver 53 are GND (0 V). It has become.
- a bipolar pulse of a voltage higher than V p s must be applied.
- the row driver 53 applies GND r to the row electrodes X I to X 3 based on the control of the controller 51, and the column driver 52 applies GND c to the column electrodes Y 1 to Y 3.
- the controller 51 controls the switch 55 for the entire planar reset so that the predetermined time width (time width determined by the application time of the bipolar pulse) is GND.
- the output voltage to the row electrodes X 1 to X 3 of the row driver 53 becomes a pulse voltage of (V 1 + V 2), as shown in FIG.
- the output voltage to the column electrodes Y 1 to Y 3 of the column driver 52 is, as shown in FIG.
- the pulse voltage is ( ⁇ V 1 ⁇ V 2), and the application timing thereof is the timing after the GND r is applied to the row electrodes X I to X 3.
- a bipolar pulse of V 1 + V 2 is applied between the pixel electrodes corresponding to each of the pixels (X 1, Y 1) to (X 3, Y 3)
- V 1 + V 2 VVp s the cholesteric liquid crystal layer 14 between the two electrodes of the transparent column electrode 12 and the transparent row electrode 15 at the corresponding pixel position is It will be in a rena state, and it will scatter light of specific wavelength. That is, the display of the pixels (XI, Y1) to (X3, Y3) all have specific wavelength colors, and all the planar reset states.
- the row driver 53 sequentially operates the row electrode X2, the row electrode X2, the row electrode X3 and the both electrodes of the voltage V3.
- One of the row electrodes is selected by applying a scanning pulse.
- the column driver 52 selectively selects one of the column electrode Y1 to the column electrode Y3 in accordance with the selection timing of the row electrode.
- the reverse characteristic bipolar pulse 1 V 4 is applied to Specifically, when the row electrode X 1 is selected, the column driver 52 applies a bipolar pulse _V 4 of the reverse characteristic to the column electrode Y 1 and the column electrode Y 2, and the mouth electrode X 2 When selected, an opposite polarity bipolar pulse V 4 is applied to the column electrode Y 2 and the column electrode Y 3, and when the row electrode X 3 is selected, the column electrode Y 2 and the column electrode ⁇ 3 Apply an opposite polarity bipolar pulse V 4 to the.
- a bipolar pulse voltage of V 3 + V 4> V fs is applied between the pixel electrodes where the bipolar pulse is applied to the mouth electrode and the column electrode at the same timing, as shown in FIG.
- the cholesteric liquid crystal layer 14 between the two electrodes of the transparent column electrode 12 and the transparent row electrode 15 at the corresponding pixel position is in the focal conic state and becomes transparent. That is, the selected six pixels of (XI, Y1), (XI, Y2), (X2, Y2), (X2, Y3), (X3, Y2) and (X3, Y3) Is displayed in black, and the display of the other pixels remains at the specific wavelength color.
- the display is reset and the arbitrary pixel is inverted from the specific wavelength color to black while suppressing the withstand voltage of the driver low. It is possible to
- the drive voltage of the driver (in this case, the column driver 52 and the row driver 53) of the liquid crystal drive circuit for driving the cholesteric liquid crystal display panel 1 is lowered, so that the driver has a small package element. Since it is possible to select the liquid crystal display device, it is possible to miniaturize the liquid crystal display device.
- a driver of a liquid crystal drive circuit for driving the cholesteric liquid crystal display panel 1 is a driver of a liquid crystal drive circuit for driving the cholesteric liquid crystal display panel 1
- the driving voltage of the column driver 52 and the row driver 53 is lowered, so that a battery for supplying power to the driver may be used such as a series connection of an electric double layer capacitor, etc.
- a battery for supplying power to the driver may be used such as a series connection of an electric double layer capacitor, etc.
- the necessary voltage value can be sufficiently supplied by further stepping up the voltage by using a series connection of a plurality of 2.5 V electric double layer capacitors in series) Therefore, the liquid crystal display can be further miniaturized.
- the liquid crystal display device including the device 1 can be used, for example, as a display device used for a small information processing apparatus such as a PDA, a clock, an IC card, and the like.
- step S1 the controller 51 controls the switch 55 to set G N D r supplied to the port driver 5 3 to G N D, that is, 0 V.
- step S2 the controller 51 controls the switch 54 to set the GND c supplied to the column driver 52 to GND, that is, OV.
- step S3 the controller 51 controls the row driver 53, and sets the output voltage of the mouth driver 53 to GND r.
- step S4 the controller 51 controls the column driver 52 to set the output voltage of the column driver 52 to GNDc.
- step S5 the controller 51 controls the switch 55 to supply GND r supplied from the GND to (V 1 + V 2) for a time corresponding to a predetermined pulse width. Switch.
- step S6 the controller 51 controls the switch 54 to switch GND c supplied to the column driver 52 from GN D to (one V 1-V 2) for a time corresponding to a predetermined pulse width. .
- V 1 + V 2 bipolar pulse is generated in all pixel electrodes of the cholesteric liquid crystal panel 1 (all intersections of the transparent column electrode 12 and the transparent row electrode 15). As the voltage is applied, the information held before the voltage application is reset.
- step S7 the controller 51 controls the switch 54 and the switch 55 to set GND r to be supplied to the row driver 53 and GND c to be supplied to the column driver 52 as GND.
- step S8 the controller 51 controls the row driver 53 to scan and apply the selection voltage V3 to the row electrode, and controls the column driver 52 so that the opposite polarity bipolar pulse is applied to the column electrode.
- One V 4 is selectively applied to drive the cholesteric liquid crystal panel to display information, and the processing is terminated.
- a voltage is applied from the column driver 52 to the column electrodes Y1 to Yn of the transparent column electrode 12 of the cholesteric liquid crystal panel 1 at a predetermined timing which will be described later with reference to FIG.
- each pixel electrode corresponding to the pixels (X 1, Y 1) to (X 3, Y 3) is The bipolar pulse voltage shown in Figure 11 is applied. Therefore, after the entire plane is reset to 9 pixels of 3 ⁇ 3 of the cholesteric liquid crystal panel 1, as shown in FIG. 6, (XI, Y 1) (XI, Y 2)
- a liquid crystal display device using a cholesteric liquid crystal which can hold information once displayed without power supply by such processing all the planarity of the cholesteric liquid crystal between the pixel electrodes is made planar.
- the potential difference between the electrodes necessary for resetting can be generated by switching the voltage values of GND r and GND c supplied to the row driver 53 and the column driver 52.
- a switch 54 and a switch 55 configured of F ET can be used.
- the information display after the all white reset uses the same method as a conventional liquid crystal display device using a cholesteric liquid crystal, so the withstand voltage required for the mouth driver 53 and the column driver 52 It is determined by the voltage between the pixel electrodes required to achieve the conic state. That is, in the liquid crystal display device provided with the liquid crystal drive circuit 41 to which the present invention is applied, the withstand voltage required for the mouth driver 53 and the column driver 52 can be made about half that in the conventional case. Therefore, according to the liquid crystal display device including the liquid crystal drive circuit 41 to which the present invention is applied, it is possible to invert any pixel from the specific wavelength color to black while suppressing the withstand voltage of the driver low. Can realize miniaturization and cost reduction of the liquid crystal drive circuit for driving the
- the series of processes described above can also be performed by software.
- the software can execute various functions by, for example, a general purpose computer that can execute various functions by installing a computer that includes programs constituting the software on dedicated hardware or various programs. It is installed from a recording medium on a personal computer etc.
- This recording medium is a magnetic disk 61 (including a flexible disk) on which a program is recorded, which is distributed to provide a program to the user separately from the computer, an optical disk 6 2 (Including CD-ROM (Compact Read-Only Memory), DVD (Digital Versatile Disk), magneto-optical disk 6 3 (including MD (Mini-Di sk) (trademark)), or semiconductor memory 6 It consists of package media etc.
- information can be displayed on a display device using a liquid crystal display element.
- a liquid crystal display element it is possible to reset the display of the display unit provided with the cholesteric liquid crystal and write information at a low driving voltage.
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Computer Hardware Design (AREA)
- Optics & Photonics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/542,000 US20060267890A1 (en) | 2003-01-21 | 2004-01-21 | Display device, display method, liquid crytal drive circuit, and liquid crystal drive method |
EP04703901A EP1586936A1 (en) | 2003-01-21 | 2004-01-21 | Display device, display method, liquid crystal drive circuit, and liquid crystal drive method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-012569 | 2003-01-21 | ||
JP2003012569A JP3705436B2 (ja) | 2003-01-21 | 2003-01-21 | 表示装置および表示方法、並びに、液晶駆動回路および液晶駆動方法 |
Publications (1)
Publication Number | Publication Date |
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WO2004066021A1 true WO2004066021A1 (ja) | 2004-08-05 |
Family
ID=32767336
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/000482 WO2004066021A1 (ja) | 2003-01-21 | 2004-01-21 | 表示装置および表示方法、液晶駆動回路および液晶駆動方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060267890A1 (ja) |
EP (1) | EP1586936A1 (ja) |
JP (1) | JP3705436B2 (ja) |
CN (1) | CN1754117A (ja) |
WO (1) | WO2004066021A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108335680A (zh) * | 2018-01-29 | 2018-07-27 | 上海贝岭股份有限公司 | 显示驱动系统 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4470096B2 (ja) * | 2003-12-24 | 2010-06-02 | ソニー株式会社 | 表示装置および表示方法、並びに、液晶駆動回路および液晶駆動方法 |
JP4494180B2 (ja) * | 2004-12-07 | 2010-06-30 | ナノックス株式会社 | コレステリック液晶表示装置およびコレステリック液晶表示素子の駆動方法 |
JP4945964B2 (ja) * | 2005-09-01 | 2012-06-06 | コニカミノルタホールディングス株式会社 | 液晶表示装置 |
GB2455127B (en) * | 2007-11-30 | 2012-07-25 | Hewlett Packard Development Co | Reflective display |
JP2011128440A (ja) * | 2009-12-18 | 2011-06-30 | Fujitsu Ltd | 電圧供給回路及び表示装置 |
JP2012211982A (ja) * | 2011-03-31 | 2012-11-01 | Fujitsu Ltd | 液晶表示装置及びその駆動方法 |
US9564099B2 (en) * | 2014-03-10 | 2017-02-07 | Lumotune Inc. | Bistable display systems and methods |
CN114203120A (zh) * | 2021-11-16 | 2022-03-18 | 北京奕斯伟计算技术有限公司 | 液晶手写板及其驱动电路和驱动方法 |
TWI792688B (zh) | 2021-11-17 | 2023-02-11 | 虹彩光電股份有限公司 | 膽固醇液晶顯示裝置 |
Citations (5)
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US5748277A (en) * | 1995-02-17 | 1998-05-05 | Kent State University | Dynamic drive method and apparatus for a bistable liquid crystal display |
JP2001042286A (ja) * | 1999-07-27 | 2001-02-16 | Minolta Co Ltd | 液晶表示素子の駆動方法及び液晶表示装置 |
JP2001100669A (ja) * | 1999-09-30 | 2001-04-13 | Minolta Co Ltd | 情報表示装置、その駆動方法、及び携帯端末装置 |
US20010024188A1 (en) * | 2000-02-17 | 2001-09-27 | Minolta Co., Ltd. | Liquid crystal display driving method and liquid crystal display device |
US20020015132A1 (en) * | 2000-05-22 | 2002-02-07 | Minolta Co., Ltd. | Liquid crystal display |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4081907B2 (ja) * | 1998-04-15 | 2008-04-30 | コニカミノルタホールディングス株式会社 | 液晶表示装置及び液晶表示素子の駆動方法 |
US6888522B1 (en) * | 1999-03-31 | 2005-05-03 | Minolta Co., Ltd. | Information display apparatus |
-
2003
- 2003-01-21 JP JP2003012569A patent/JP3705436B2/ja not_active Expired - Fee Related
-
2004
- 2004-01-21 US US10/542,000 patent/US20060267890A1/en not_active Abandoned
- 2004-01-21 CN CN200480002551.6A patent/CN1754117A/zh active Pending
- 2004-01-21 EP EP04703901A patent/EP1586936A1/en not_active Withdrawn
- 2004-01-21 WO PCT/JP2004/000482 patent/WO2004066021A1/ja not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5748277A (en) * | 1995-02-17 | 1998-05-05 | Kent State University | Dynamic drive method and apparatus for a bistable liquid crystal display |
JP2001042286A (ja) * | 1999-07-27 | 2001-02-16 | Minolta Co Ltd | 液晶表示素子の駆動方法及び液晶表示装置 |
JP2001100669A (ja) * | 1999-09-30 | 2001-04-13 | Minolta Co Ltd | 情報表示装置、その駆動方法、及び携帯端末装置 |
US20010024188A1 (en) * | 2000-02-17 | 2001-09-27 | Minolta Co., Ltd. | Liquid crystal display driving method and liquid crystal display device |
US20020015132A1 (en) * | 2000-05-22 | 2002-02-07 | Minolta Co., Ltd. | Liquid crystal display |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108335680A (zh) * | 2018-01-29 | 2018-07-27 | 上海贝岭股份有限公司 | 显示驱动系统 |
Also Published As
Publication number | Publication date |
---|---|
EP1586936A1 (en) | 2005-10-19 |
JP3705436B2 (ja) | 2005-10-12 |
JP2004264325A (ja) | 2004-09-24 |
US20060267890A1 (en) | 2006-11-30 |
CN1754117A (zh) | 2006-03-29 |
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