CN113948046A - Driving module for active matrix driving cholesterol liquid crystal display device and driving method thereof - Google Patents

Driving module for active matrix driving cholesterol liquid crystal display device and driving method thereof Download PDF

Info

Publication number
CN113948046A
CN113948046A CN202010790425.2A CN202010790425A CN113948046A CN 113948046 A CN113948046 A CN 113948046A CN 202010790425 A CN202010790425 A CN 202010790425A CN 113948046 A CN113948046 A CN 113948046A
Authority
CN
China
Prior art keywords
small window
liquid crystal
dynamic small
reset
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010790425.2A
Other languages
Chinese (zh)
Inventor
连水池
黄俊宏
吕庆祥
邱钟毅
赖梓杰
陈仁禄
陈柏林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hongyao Electric Paper Technology Co ltd
Original Assignee
Hongyao Electric Paper Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hongyao Electric Paper Technology Co ltd filed Critical Hongyao Electric Paper Technology Co ltd
Publication of CN113948046A publication Critical patent/CN113948046A/en
Pending legal-status Critical Current

Links

Images

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
    • G09G3/36—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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3651—Control of matrices with row and column drivers using an active matrix using multistable liquid crystals, e.g. ferroelectric liquid crystals
    • 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
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The invention provides a driving module which is used for an active matrix driving cholesterol liquid crystal display device. The driving module comprises a grid driving circuit for generating a plurality of grid driving signals; the source driving circuit is used for generating a plurality of data driving signals; and the time schedule controller is used for controlling the plurality of grid driving signals and the plurality of data driving signals, so that the active matrix driving cholesterol liquid crystal display device displays a dynamic picture in a dynamic small window, and when a static picture is displayed outside the dynamic small window, data updating is carried out on a plurality of first cholesterol liquid crystal pixels in the dynamic small window, and data updating is not carried out on a plurality of second cholesterol liquid crystal pixels outside the dynamic small window.

Description

Driving module for active matrix driving cholesterol liquid crystal display device and driving method thereof
Technical Field
The present invention relates to a driving module for an active matrix driving cholesteric liquid crystal display device and a driving method thereof, and more particularly, to a driving module and a driving method thereof, which can not update data of cholesteric liquid crystal pixels outside a dynamic small window, thereby saving power consumption and avoiding flickering caused by frequently updating a static image.
Background
Active matrix liquid crystal displays (AM-LCDs) using nematic (nematic) liquid crystals have been widely used in many applications. However, the use of a backlit and transmissive active matrix liquid crystal display is not conducive to long-term reading by people, particularly children. Recently, paper-like displays have been widely used in consideration of the advantages of paper and the characteristics of electronic devices that can update information.
One application of the paper-like Display is a Cholesteric Liquid Crystal Display (Cholesteric Liquid Crystal Display). The cholesteric liquid crystal display has the characteristics of bi-stability, high contrast and high color. The cholesteric liquid crystal display consumes power only when changing the picture, and the cholesteric liquid crystal display can still display the picture under the condition of no applied voltage. The characteristics of the cholesterol liquid crystal can be applied to a reflective display. Therefore, for static image display, the reflective cholesteric liquid crystal display has a very good power-saving characteristic.
In the prior art, when a dynamic picture is displayed in a dynamic small window and a static picture is displayed outside the dynamic small window, unnecessary power consumption is caused by updating the static picture, and the static picture is flickered because of frequent updating. In view of the above, there is a need for improvement in the prior art.
Disclosure of Invention
Therefore, the present invention is directed to a driving module and a driving method thereof, which can not update data of a cholesteric liquid crystal pixel outside a dynamic small window, thereby saving power consumption and avoiding flickering caused by frequently updating a static image.
The invention discloses a driving module for an active matrix driving cholesterol liquid crystal display device. The driving module comprises a grid driving circuit for generating a plurality of grid driving signals; the source driving circuit is used for generating a plurality of data driving signals; and the time schedule controller is used for controlling the plurality of grid driving signals and the plurality of data driving signals, so that the active matrix driving cholesterol liquid crystal display device displays a dynamic picture in a dynamic small window, and when a static picture is displayed outside the dynamic small window, data updating is carried out on a plurality of first cholesterol liquid crystal pixels in the dynamic small window, and data updating is not carried out on a plurality of second cholesterol liquid crystal pixels outside the dynamic small window.
The invention also discloses a driving method for the active matrix driving cholesterol liquid crystal display device, which comprises generating a plurality of grid driving signals; generating a plurality of data driving signals; and controlling the plurality of grid driving signals and the plurality of data driving signals to enable the active matrix driving cholesterol liquid crystal display device to display a dynamic picture in a dynamic small window, and when a static picture is displayed outside the dynamic small window, performing data updating on a plurality of first cholesterol liquid crystal pixels in the dynamic small window, and not performing data updating on a plurality of second cholesterol liquid crystal pixels outside the dynamic small window.
Drawings
Fig. 1 is a schematic diagram of an active matrix driving cholesteric liquid crystal display device according to an embodiment of the invention.
FIG. 2 is a diagram illustrating the relationship between the reflectivity of cholesteric liquid crystal and voltage according to an embodiment of the present invention.
Fig. 3 is a timing diagram of gate driving signals in a sequential reset scan re-determination scan operation.
Fig. 4 is a timing diagram of gate driving signals in a full gate reset re-determination scan operation.
FIG. 5 is a diagram illustrating an embodiment of sequentially resetting a scan re-determination scan operation to update dynamic widgets.
FIG. 6 is a diagram illustrating an embodiment of a full gate reset re-determination scan operation to update a dynamic small window.
FIG. 7 is a diagram illustrating another operation of updating a dynamic widget according to an embodiment of the present invention,
FIG. 8 is a diagram illustrating the full-gate reset re-determination scanning operation shown in FIG. 6 or the operation refresh dynamic small window shown in FIG. 7 according to the embodiment of the present invention.
Fig. 9 is a schematic diagram of a driving flow according to an embodiment of the invention.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic diagram of an active matrix driven cholesteric liquid crystal display (cholesteric liquid crystal display) device 10 according to an embodiment of the invention. For convenience of illustration, the active matrix driving cholesteric liquid crystal display device 10 is simplified to include a source driving circuit 100, a gate driving circuit 102, a timing controller 104, and data lines S1～SMScanning line G1～GNAnd a cholesteric liquid crystal pixel matrix Mat, wherein the source driving circuit 100, the gate driving circuit 102 and the timing controller 104 are regarded as the driving module 12. The cholesteric liquid crystal pixel matrix Mat comprises a plurality of cholesteric liquid crystal pixels, each of which comprises cholesteric liquid crystal, and the circuit thereof can be simplified to be composed of a transistor T, a storage capacitor Cst and a liquid crystal capacitor Cls. The storage capacitor Cst and the liquid crystal capacitor Cls are coupled to the common voltage Vcom; the Transistor T is a switching element, which may be a Thin Film Transistor (TFT), including but not limited to amorphous Silicon (a-Si), Oxide (Oxide), and Low Temperature Poly-Silicon (LTPS), which may be NMOS or PMOS TFTs.
Referring to fig. 2, fig. 2 is a schematic diagram of a relationship between a reflectivity and a voltage of a Cholesteric Liquid Crystal Display (CH-LCD) according to an embodiment of the invention. As shown in fig. 2, the cholesteric liquid crystal state is changed by modulating the voltage across the storage capacitor Cst and the liquid crystal capacitor Cls, and the Planar state (Planar) reflects light with a specific wavelength and the Focal-conic state (Focal-conic) scatters light, so that the reflectivity can be modulated by voltage. When the cholesteric liquid crystal state is modulated, the cholesteric liquid crystal can be driven to a Homeotropic (Homeotropic) state by a larger resetting (resetting) voltage, and then driven to a planar state or a focal conic state required by a user by a smaller determining (determining) voltage, so as to modulate the required reflectivity. Therefore, the full-color reflective cholesteric liquid crystal pixel with bistable characteristic can be manufactured.
In this case, the timing controller 104 can utilize the horizontal synchronization signal Hsync and the output enable signal Ena to control the source driving circuit 100 and the gate driving circuit 102 respectively to generate the data driving signal Sig _ S1～Sig_SMAnd gate driving signal Sig _ G1～Sig_GNTo charge the corresponding cholesteric liquid crystal pixels in the cholesteric liquid crystal pixel matrix Mat. In other words, the transistors T in each cholesteric liquid crystal pixel are first turned on by the corresponding gate driving signal for one time to perform reset scanning, so that the cholesteric liquid crystal is driven by the corresponding data driving signal with a large reset voltage to reach a stable homodromous arrangement state, and then the transistors T in each cholesteric liquid crystal pixel are turned on by the corresponding gate driving signal for one time to perform decision scanning, and then driven by the corresponding data driving signal with a small decision voltage according to a picture desired by a user to reach a stable planar state or focal conic state and corresponding gray scale and brightness, so that the cholesteric liquid crystal pixel matrix Mat can display the picture desired by the user. Therefore, after each cholesterol liquid crystal pixel is driven by a larger reset voltage to reach a stable equidirectional arrangement state, the cholesterol liquid crystal pixel matrix Mat is actively driven by a smaller decision voltage to reach a stable plane state or focal conic state and a corresponding gray scale and brightness, so that the fast update rate is achieved, and the picture display such as film playing can be smoothly carried out.
In detail, referring to fig. 3, fig. 3 shows the gate in the sequential reset scan re-determining scan operation 30Polar drive signal Sig _ G1～Sig_GNTiming diagram of (2). As shown in FIG. 3, in the frame F of positive polaritypIn the reset phase of (1) a gate drive signal Sig _ G1～Sig_GNFirstly, the reset scanning time tsr is used to correspond to the scanning lines G1～GNA reset scan is performed, in which case the data driving signal Sig _ S1～Sig_SMDriving corresponding cholesterol liquid crystal pixels with larger positive polarity reset voltage, waiting for reset retention time Thr to ensure that all the cholesterol liquid crystal pixels reach stable homodromous arrangement state, and then in positive polarity frame FpIn the determination stage of (1), the gate driving signal Sig _ G1～Sig_GNThen determine the scanning time tsd for the corresponding scanning line G1～GNPerforming a decision scan, wherein the data driving signal Sig _ S1～Sig_SMThe corresponding cholesterol liquid crystal pixel is driven by a smaller positive polarity determination voltage according to the picture desired by the user, then all the cholesterol liquid crystal pixels can use the frame remaining time as the determination retention time Thd, and then the stable plane state or focal conic state and the corresponding gray scale and brightness are respectively achieved so as to display the picture desired by the user. And so on in the negative polarity frame FnThe reset stage and the determination stage can be driven by a larger negative polarity reset voltage and a smaller negative polarity determination voltage respectively to display the picture desired by the user.
On the other hand, referring to fig. 4, fig. 4 shows the gate driving signal Sig _ G in the full-gate reset re-determination scan operation 401～Sig_GNTiming diagram of (2). The full-gate reset re-determining scan operation 40 shown in FIG. 4 is substantially similar to the sequential reset scan re-determining scan operation 30 shown in FIG. 3, and therefore the same parts are denoted by the same symbols, the main difference being that the full-gate reset re-determining scan operation 40 is performed in the positive polarity frame FpIn the reset phase of (1) a gate drive signal Sig _ G1～Sig_GNCorresponding scanning line G is aligned in the total gate reset time Tag1～GNPerforming full gate reset to reset all the scan lines G1～GNSimultaneous or substantially simultaneous opening (to avoid excessive simultaneous opening of output currents causing circuit burnThe destruction, in practice, can be done in rows (rows) or in partitions which are rapidly turned on in a very short time, e.g., 1 μ s-2 μ s). The rest of the operations are similar to the sequential reset scan shown in fig. 3, and reference is made to the above description, which is not repeated herein for brevity. Therefore, the full-grid reset re-determined scanning operation can also enable all the cholesteric liquid crystal pixels to respectively reach a stable plane state or a focal conic state and corresponding gray scale and brightness so as to display a picture desired by a user.
Under the condition, when a user displays a dynamic picture in the dynamic small window in the cholesterol liquid crystal pixel matrix Mat and displays a static picture outside the dynamic small window, the invention can only update the data of the cholesterol liquid crystal pixels in the dynamic small window, and does not or hardly update the data of the cholesterol liquid crystal pixels outside the dynamic small window. Therefore, the invention can save power consumption and avoid flickering caused by frequently updating the static picture.
For example, referring to fig. 5, fig. 5 is a schematic diagram illustrating an embodiment of a sequential reset scan re-determination scan operation 50 for updating a dynamic small window DSW. As shown in FIG. 5, the data driving signal Sig _ S in the reset phase is compared to the sequential reset scan re-determination scan operation 301～Sig_SMFor all scanning lines G in sequence1～GNThe corresponding cholesteric liquid crystal pixels are driven by a larger reset voltage and then driven by a smaller decision voltage in the decision stage according to the picture desired by the user, and the sequential reset scanning re-decision scanning operation 50 of the embodiment of the invention drives the data driving signal Sig _ S in the reset stage1～Sig_SMThe method comprises the steps of driving and resetting only cholesterol liquid crystal pixels corresponding to a dynamic small window DSW by a larger reset voltage, applying non-reset voltages (such as 0V, approximate 0V and the like which are approximately 0V or less than a transition voltage arranged in a same direction to a plane state) which are not reset to other cholesterol liquid crystal pixels, driving and determining only the cholesterol liquid crystal pixels corresponding to the dynamic small window DSW by a smaller determination voltage according to a picture desired by a user in a determination stage, and applying non-determination voltages (such as 0V, approximate 0V and the like which are approximately 0V or less than a transition voltage arranged in a same direction to a plane state) which are not determined to other cholesterol liquid crystal pixels. In this manner,the invention can save power consumption and avoid flickering caused by frequently updating the static picture by not updating the cholesterol liquid crystal pixel which does not correspond to the dynamic small window DSW.
For example, referring to fig. 6, fig. 6 is a schematic diagram illustrating an embodiment of an all-gate reset re-determination scan operation 60 for updating a dynamic small window DSW. As shown in fig. 6, the scan operation 40 is compared to the sequential full gate reset re-determination scan operation 40 for all scan lines G in the reset phase1～GNSimultaneously or substantially simultaneously, data drive signals Sig _ S1～Sig_SMThe corresponding cholesteric liquid crystal pixels are driven by a larger reset voltage, and are driven by a smaller decision voltage in a decision stage according to a picture desired by a user, and the full-gate reset re-decision scanning operation 60 of the embodiment of the invention drives the data driving signal Sig _ S in the reset stage1～Sig_SMFor the scan line region R only where the dynamic small window DSW ismThe cholesterol liquid crystal pixel corresponding to the middle dynamic small window DSW is reset by driving with a larger reset voltage, and the scanning line region RmThe cholesteric liquid crystal pixels not corresponding to the dynamic small window DSW and the scan line region (such as the scan line region R) where the non-dynamic small window DSW is locatedu、Rl) The cholesterol liquid crystal pixel is applied with non-reset voltage (such as 0V, close to 0V, less than the transition voltage from homodromous arrangement to plane state) which can not be reset, and only the scanning line region R where the dynamic small window DSW is located is determinedmThe cholesterol liquid crystal pixel corresponding to the middle dynamic small window DSW is driven by a smaller decision voltage to decide according to the picture desired by the user, and the scanning line region RmThe cholesteric liquid crystal pixels not corresponding to the dynamic small window DSW and the scan line region (such as the scan line region R) where the non-dynamic small window DSW is locatedu、Rl) The cholesteric liquid crystal pixel is applied with a nondeterministic voltage (such as 0V, close to 0V, and less than a transition voltage from a homeotropic alignment to a planar state) which is not determined. In this way, the present invention can simplify the data driving signal Sig _ S by not updating the scan line region not corresponding to the dynamic small window DSW1～Sig_SMBy not modifying the cholesteric liquid crystal pixels not corresponding to the dynamic small window DSWAnd the power consumption can be saved and the flicker caused by frequently updating the static picture can be avoided.
It should be noted that the above is only an embodiment of the present invention, and the main spirit of the present invention lies in that only the data updating is performed on the cholesteric liquid crystal pixels inside the dynamic small window, and no or little data updating is performed on the cholesteric liquid crystal pixels outside the dynamic small window. For example, the dynamic out-of-window cholesterol liquid crystal pixel is not or hardly updated except by the data driving signal Sig _ S1～Sig_SMIn addition to applying a non-reset voltage that does not reset in the reset phase and a non-decision voltage that does not decide in the decision phase, the gate driving signal Sig _ G may be used1～Sig_GNThis is accomplished without turning on scan lines that do not correspond to dynamic widgets.
Specifically, referring to fig. 7, fig. 7 is a schematic diagram illustrating an operation 70 for updating a dynamic small window DSW according to an embodiment of the present invention, where the operation 70 may be a sequential reset scan re-determination scan operation or a full gate reset re-determination scan operation. As shown in fig. 7, the scan line G is still turned on in the reset phase and in the determination phase as compared to the sequential reset scan re-determination scan operation 50 or the full gate reset re-determination scan operation 601～GNScanning lines or scanning line regions (e.g. scanning line region R) of the medium-to-small dynamic window DSWu、Rl) Data drive signal Sig _ S1～Sig_SMThen, the non-reset voltage and the non-decision voltage are applied respectively, and the operation 70 does not turn on the scan line G in the reset stage and the decision stage1～GNScanning lines or scanning line regions (e.g. scanning line region R) of the medium-to-small dynamic window DSWu、Rl) Thus, the data driving signal Sig _ S1～Sig_SMThe corresponding cholesteric liquid crystal pixel is not needed or can not be applied with voltage, and only the scanning line G is turned on in the reset stage and the determination stage1～GNScan line or scan line region (e.g., scan line region R) of middle corresponding dynamic small window DSWm)，Then, the cholesterol liquid crystal pixels corresponding to the dynamic small window DSW are respectively driven by a larger reset voltage to reset and a picture desired by a user is driven by a smaller decision voltage to decide, and the cholesterol liquid crystal pixels which do not correspond to the dynamic small window DSW are respectively applied with a non-reset voltage which can not be reset and a non-decision voltage which can not be decided. Therefore, the invention does not turn on the scanning line G1～GNThe data driving signal Sig _ S can be further simplified by not corresponding to the scan line or scan line region of the dynamic small window DSW1～Sig_SMBy not updating the cholesteric liquid crystal pixels which do not correspond to the dynamic small window DSW, power consumption can be saved and flickering caused by frequent updating of static pictures can be avoided.
For example, referring to fig. 8, fig. 8 is a schematic diagram illustrating an embodiment of an all-gate reset re-determination scan operation 60 or an operation 70 for updating a dynamic small window DSW. As shown in fig. 8, the timing controller 104 utilizes the horizontal synchronization signal Hsync and the output enable signal Ena to indicate the positions of the dynamic windows DSW of the source driving circuit 100 and the gate driving circuit 102 to generate the corresponding data driving signals Sig _ S1～Sig_SMAnd gate driving signal Sig _ G1～Sig_GNThe dynamic small window DSW is updated. In this case, the gate driving circuit 102 may not turn on the scan line G in the reset phase and the determination phase as in operation 701～GNThe scan lines G in the scan line or scan line region not corresponding to the dynamic small window DSW (i.e. the gate driving signal drawn by the dotted line is not output) may also be turned on during the reset phase and the determining phase as the full gate reset re-determining scan operation 601～GNThe scan line or the scan line region (i.e., the gate driving signal depicted by the dotted line) of the dynamic small window DSW is not corresponded to. It should be noted that fig. 8 shows the full gate reset in the reset phase, but the sequential reset scan may also be implemented.
On the other hand, for the source driving circuit 100, the data driving signal Sig _ S is in the reset phase1～Sig_SMThe cholesteric liquid crystal pixels corresponding to the dynamic small window DSW are driven by a larger reset voltage RST for resettingIn the determination phase, only the cholesteric liquid crystal pixel corresponding to the dynamic small window DSW is driven by a smaller determination voltage DTA according to a picture desired by a user to be determined, and the non-determination voltage GND' (such as 0V, close to 0V, smaller than the transition voltage arranged in the same direction to the planar state) which is not determined is applied to other cholesteric liquid crystal pixels. In this way, the present invention can simplify the data driving signal Sig _ S by not updating the scan line region not corresponding to the dynamic small window DSW1～Sig_SMBy not updating the cholesteric liquid crystal pixels which do not correspond to the dynamic small window DSW, power consumption can be saved and flickering caused by frequent updating of static pictures can be avoided.
It should be noted that the embodiments of the timing controller 104, the source driving circuit 100 and the gate driving circuit 102 are not limited in the present invention, as long as the data updating can be performed on the cholesteric liquid crystal pixels in the dynamic small window, and the data updating is not performed on the cholesteric liquid crystal pixels outside the dynamic small window. For example, in an embodiment of the source driving circuit 100, the timing controller 104 may transmit a signal corresponding to the scan line G through an existing mini-LVDS (mini low voltage differential signaling) interface (without adding an additional control interface to reduce the complexity of the system)1～GNBefore the image data, the data lines S corresponding to the data lines are transmitted by using the virtual scan line (dummy line) time1～SMThe content of the dummy scan line data is used to determine the horizontal data line S1～SMIn the range to be updated (i.e. the range of the data line corresponding to the dynamic window of the source driving circuit 100 is indicated), the real-time controller 104 first transmits the data of the dummy scan line and then transmits the data of the corresponding scan line G1～GNThe image data of (2). Specifically, the bit value of the most significant bit or other bits of the dummy scan line data can be used to indicate whether the corresponding data line is located in the data line range corresponding to the dynamic small window, and determine whether the corresponding data line outputs the reset voltage driverReset is done (e.g., the most significant bit is 1) or a non-reset voltage is output (e.g., the most significant bit is 0) that does not reset. The Hsync signal may include a reset signal indicating that the currently transmitted signal of the source driving circuit 100 is dummy scan line data indicating the refresh range. Further, the timing controller 104 makes the source driving circuit 100 determine the data line S while transmitting the dummy scan line data1～SMAfter the dynamic window range to be updated, the timing controller 104 can only transmit the data to be updated so that the source driving circuit 100 only outputs the data line S1～SMCorresponding to the data driving signal Sig _ S of the dynamic small window1～Sig_SMI.e. the data driving signal Sig _ S300～Sig_S600) Setting other data driving signals to be approximately 0V or less than the state-transition voltage arranged in the same direction to the plane state to simplify the data driving signal Sig _ S1～Sig_SM。
On the other hand, for the embodiment of the gate driving circuit 102, the output enable signal Ena transmitted by the timing controller 104 may include a plurality of anti-all-gate-on signals to instruct the gate driving circuit 100 to respectively apply to the scan lines G1～GNThe plurality of scan line regions are turned on. For example, if the dynamic small window to be updated is located in the first scan line region (e.g. scan line G) corresponding to the first anti-full gate-on signal1～G108) The first anti-full grid opening signal can be controlled to be at a low level to open the corresponding scanning line to reset and determine the corresponding cholesterol liquid crystal pixel, and the scanning lines of other scanning line areas are not opened; if the dynamic small window to be updated is located in the first scan line region (such as scan line G) corresponding to the first anti-full gate turn-on signal and the second anti-full gate turn-on signal1～G108) And two first scan line regions (e.g., scan line G)109～G216) The first anti-full grid opening signal and the second anti-full grid opening signal can be controlled to be at low level to open the corresponding scanning line to reset and determine the corresponding cholesterol liquid crystal pixel, and the scanning lines of other scanning line areas are not opened. Go further forwardIn one step, the gate driving circuit 102 may be additionally provided with scan lines G corresponding to the scan lines1～GNThe line buffer is used for receiving and indicating a scan line range corresponding to the dynamic small window, so as to accurately control to only open the scan line corresponding to the dynamic small window, and not to open other scan lines, wherein the line buffer can be a line buffer with only 1 bit (for indicating to open or close).
Therefore, the driving operation of the driving module 12 can be summarized as a driving flow 90, as shown in fig. 9, which includes the following steps:
step 900: and starting.
Step 902: generating a gate driving signal Sig _ G1～Sig_GN。
Step 904: generating a data drive signal Sig _ S1～Sig_SM。
Step 906: control gate drive signal Sig _ G1～Sig_GNAnd data driving signal Sig _ S1～Sig_SMWhen the active matrix driving cholesteric liquid crystal display device 10 displays a dynamic picture in the dynamic small window DSW and displays a static picture outside the dynamic small window DSW, the data updating is performed on the plurality of first cholesteric liquid crystal pixels in the dynamic small window DSW, and the data updating is not performed on the plurality of second cholesteric liquid crystal pixels outside the dynamic small window DSW.
Step 908: and (6) ending.
The detailed operation of the driving process 90 can refer to the related description of the driving module 12, and is not described herein again.
In summary, when the dynamic window displays the dynamic picture, and when the static picture is displayed outside the dynamic window, the data updating is only performed on the cholesteric liquid crystal pixels inside the dynamic window, and the data updating is not performed on the cholesteric liquid crystal pixels outside the dynamic window, so as to save power consumption and avoid flickering caused by frequently updating the static picture.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and all equivalent changes and modifications made by the claims of the present invention should be covered by the scope of the present invention.
[ notation ] to show
10 active matrix driving cholesterol liquid crystal display device
12 drive module
100 source electrode driving circuit
102 gate drive circuit
104 time sequence controller
30 to 80, operation
90, the process is
900 to 908
S1～SMData line
G1～GNScanning line
Mat cholesterol liquid crystal pixel matrix
T is transistor
Cst storage capacitor
Cls liquid crystal capacitor
Vcom common voltage
Hsync horizontal synchronization signal
Ena output enable signal
Sig_S1～Sig_SMData driving signal
Sig_G1～Sig_GNA gate driving signal
Fp,Fn:Frame
tsr reset scan time
Thr reset retention time
tsd-determining the scanning time
Thd determination of retention time
Tag full gate reset time
Dynamic small window of DSW
Rm,Ru,RlScanning line region
RST reset Voltage
GND:Non-reset voltage
DTA determining voltage
GND' is not a determined voltage.

Claims (24)

1. A driving module for an active matrix driving cholesteric liquid crystal display device, comprising:
a gate driving circuit for generating a plurality of gate driving signals;
a source driving circuit for generating a plurality of data driving signals; and
and the time schedule controller is used for controlling the plurality of grid driving signals and the plurality of data driving signals, so that the active matrix driving cholesterol liquid crystal display device displays a dynamic picture in a dynamic small window, and when a static picture is displayed outside the dynamic small window, the data updating is carried out on a plurality of first cholesterol liquid crystal pixels in the dynamic small window, and the data updating is not carried out on a plurality of second cholesterol liquid crystal pixels outside the dynamic small window.
2. The driving module as claimed in claim 1, wherein the plurality of gate driving signals sequentially and respectively perform a reset scan on the corresponding scan lines in a reset phase, the plurality of data driving signals drive the plurality of first cholesteric liquid crystal pixels in the dynamic small window to be reset by a reset voltage, and apply a non-reset voltage that does not perform a reset to the plurality of second cholesteric liquid crystal pixels outside the dynamic small window.
3. The driving module of claim 2, wherein the plurality of data driving signals are driven by a decision voltage to determine the plurality of first cholesteric liquid crystal pixels within the dynamic small window in a decision phase, and a non-decision voltage that is not determined is applied to the plurality of second cholesteric liquid crystal pixels outside the dynamic small window.
4. The driving module of claim 3, wherein the non-reset voltage or the non-deterministic voltage is substantially 0V or less than a transition voltage of the homeotropic alignment to the planar state.
5. The driving module as claimed in claim 1, wherein the plurality of gate driving signals are turned on to the corresponding scan lines substantially simultaneously during the reset period, so that the plurality of data driving signals are driven by the reset voltage to reset the plurality of first cholesteric liquid crystal pixels corresponding to the dynamic small window in the first scan line region where the dynamic small window is located, and apply the non-reset voltage which does not reset to the plurality of second cholesteric liquid crystal pixels not corresponding to the dynamic small window and the second scan line region where the dynamic small window is not located in the first scan line region.
6. The driving module as claimed in claim 5, wherein the plurality of data driving signals are driven by a determination voltage to determine the plurality of first cholesteric liquid crystal pixels corresponding to the dynamic small window in the first scan line region, and the plurality of second cholesteric liquid crystal pixels not corresponding to the dynamic small window and a second scan line region where the dynamic small window is not located in the first scan line region are driven by a non-determination voltage not determined.
7. The driving module as claimed in claim 1, wherein in the reset phase, the plurality of gate driving signals sequentially and respectively perform reset scanning on a plurality of first scan lines corresponding to the dynamic small window without performing reset scanning on a plurality of second scan lines not corresponding to the dynamic small window, the plurality of data driving signals drive the plurality of first cholesteric liquid crystal pixels in the dynamic small window to be reset by a reset voltage, and apply a non-reset voltage not to be reset to the plurality of second scan lines and the plurality of second cholesteric liquid crystal pixels outside the dynamic small window.
8. The driving module as claimed in claim 7, wherein in the determining step, the plurality of gate driving signals sequentially and respectively perform determining scanning on the plurality of first scan lines corresponding to the dynamic small window without performing determining scanning on the plurality of second scan lines not corresponding to the dynamic small window, the plurality of data driving signals determine the plurality of first cholesteric liquid crystal pixels in the dynamic small window by determining voltage driving, and apply non-determining voltage not determined to the plurality of second scan lines and the plurality of second cholesteric liquid crystal pixels outside the dynamic small window.
9. The driving module as claimed in claim 1, wherein the timing controller transmits a plurality of dummy scan line data corresponding to a plurality of data lines to indicate a range of data lines corresponding to the dynamic window of the source driving circuit.
10. The driver module as claimed in claim 9, wherein a bit value of each of the plurality of dummy scan line data indicates whether a corresponding data line is located in the data line range corresponding to the dynamic window.
11. The driving module as claimed in claim 10, wherein when the corresponding data line is not located in the data line range corresponding to the dynamic small window, the source driving circuit sets the corresponding data driving signal to be substantially 0V or less than a transition voltage arranged in a same direction to a planar state, or the timing controller does not transmit the data of the corresponding data driving signal to the source driving circuit.
12. The driving module as claimed in claim 1, wherein the gate driving circuit comprises a plurality of 1-bit line buffers corresponding to a plurality of scan lines for receiving signals indicative of a range of scan lines corresponding to the dynamic window.
13. A driving method for an active matrix driving cholesteric liquid crystal display device, comprising:
generating a plurality of grid driving signals;
generating a plurality of data driving signals; and
and controlling the plurality of grid driving signals and the plurality of data driving signals to enable the active matrix driving cholesterol liquid crystal display equipment to display a dynamic picture in a dynamic small window, and when a static picture is displayed outside the dynamic small window, performing data updating on a plurality of first cholesterol liquid crystal pixels in the dynamic small window, and not performing data updating on a plurality of second cholesterol liquid crystal pixels outside the dynamic small window.
14. The driving method as claimed in claim 13, wherein the step of performing data update on the plurality of first cholesteric liquid crystal pixels within the dynamic small window and not performing data update on the plurality of second cholesteric liquid crystal pixels outside the dynamic small window comprises:
in the reset stage, the plurality of grid driving signals sequentially and respectively carry out reset scanning on the corresponding scanning lines, the plurality of data driving signals drive the plurality of first cholesteric liquid crystal pixels in the dynamic small window to carry out reset by reset voltage, and apply non-reset voltage which cannot carry out reset on the plurality of second cholesteric liquid crystal pixels outside the dynamic small window.
15. The driving method as claimed in claim 14, wherein the step of performing data update on the plurality of first cholesteric liquid crystal pixels within the dynamic small window and not performing data update on the plurality of second cholesteric liquid crystal pixels outside the dynamic small window comprises:
in the determination phase, the plurality of data driving signals determine the plurality of first cholesteric liquid crystal pixels in the dynamic small window by using the determination voltage driving, and apply non-determination voltage which is not determined to the plurality of second cholesteric liquid crystal pixels outside the dynamic small window.
16. The driving method of claim 15, wherein the non-reset voltage or the non-determined voltage is substantially 0V or less than a transition voltage of the homeotropic alignment to the planar state.
17. The driving method as claimed in claim 13, wherein the step of performing data update on the plurality of first cholesteric liquid crystal pixels within the dynamic small window and not performing data update on the plurality of second cholesteric liquid crystal pixels outside the dynamic small window comprises:
in the reset stage, the plurality of grid driving signals are opened to the corresponding scanning lines at the same time, so that the plurality of data driving signals drive the plurality of first cholesterol liquid crystal pixels corresponding to the dynamic small window in a first scanning line area where the dynamic small window is located to be reset by reset voltage, and apply non-reset voltage which cannot be reset to the plurality of second cholesterol liquid crystal pixels which do not correspond to the dynamic small window and a second scanning line area where the dynamic small window is not located in the first scanning line area.
18. The driving method as claimed in claim 17, wherein the step of performing data update on the plurality of first cholesteric liquid crystal pixels within the dynamic small window and not performing data update on the plurality of second cholesteric liquid crystal pixels outside the dynamic small window comprises:
in the determination stage, the plurality of data driving signals determine the plurality of first cholesterol liquid crystal pixels corresponding to the dynamic small window in the first scanning line area by using determination voltage driving, and the plurality of second cholesterol liquid crystal pixels which do not correspond to the dynamic small window and a second scanning line area not corresponding to the dynamic small window in the first scanning line area apply non-determination voltage which does not determine.
19. The driving method as claimed in claim 13, wherein the step of performing data update on the plurality of first cholesteric liquid crystal pixels within the dynamic small window and not performing data update on the plurality of second cholesteric liquid crystal pixels outside the dynamic small window comprises:
in the reset stage, the plurality of gate driving signals approximately simultaneously open a first scanning line region corresponding to the dynamic small window and do not open a second scanning line region not corresponding to the dynamic small window, the plurality of data driving signals drive the plurality of first cholesterol liquid crystal pixels corresponding to the dynamic small window in the first scanning line region to be reset by reset voltage, and apply non-reset voltage which does not reset to the plurality of second cholesterol liquid crystal pixels which do not correspond to the dynamic small window in the first scanning line region.
20. The method according to claim 19, wherein the step of performing data update on the first cholesteric liquid crystal pixels in the dynamic small window and not performing data update on the second cholesteric liquid crystal pixels outside the dynamic small window comprises:
in the determining stage, the plurality of gate driving signals turn on the first scanning line region corresponding to the dynamic small window and do not turn on the second scanning line region not corresponding to the dynamic small window, the plurality of data driving signals determine the plurality of first cholesteric liquid crystal pixels corresponding to the dynamic small window in the first scanning line region by determining voltage driving, and apply non-determining voltage which does not determine to the plurality of second cholesteric liquid crystal pixels not corresponding to the dynamic small window in the first scanning line region.
21. The driving method according to claim 13, further comprising:
and transmitting a plurality of virtual scanning line data corresponding to a plurality of data lines to indicate the range of the data lines corresponding to the dynamic small window.
22. The driving method as claimed in claim 21, wherein the bit value of each of the plurality of dummy scan line data indicates whether the corresponding data line is located in the data line range corresponding to the dynamic window.
23. The driving method of claim 22, further comprising:
when the corresponding data line is not located in the data line range corresponding to the dynamic small window, the corresponding data driving signal is set to be approximately 0V or less than the transition voltage arranged in the same direction to the plane state, or the data of the corresponding data driving signal is not transmitted.
24. The driving method according to claim 13, further comprising:
a plurality of 1-bit line buffers corresponding to a plurality of scan lines are provided for receiving signals indicative of a range of scan lines corresponding to the dynamic window.
CN202010790425.2A 2020-07-15 2020-08-07 Driving module for active matrix driving cholesterol liquid crystal display device and driving method thereof Pending CN113948046A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW109123846 2020-07-15
TW109123846 2020-07-15

Publications (1)

Publication Number Publication Date
CN113948046A true CN113948046A (en) 2022-01-18

Family

ID=79326942

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010790425.2A Pending CN113948046A (en) 2020-07-15 2020-08-07 Driving module for active matrix driving cholesterol liquid crystal display device and driving method thereof

Country Status (1)

Country Link
CN (1) CN113948046A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000147466A (en) * 1998-11-17 2000-05-26 Minolta Co Ltd Method for driving liquid crystal display element and information display device
US20010024188A1 (en) * 2000-02-17 2001-09-27 Minolta Co., Ltd. Liquid crystal display driving method and liquid crystal display device
CN1417770A (en) * 2001-11-02 2003-05-14 那纳须株式会社 Cholesterol type liquid crystal plate display and its driver
US6927765B1 (en) * 1998-11-17 2005-08-09 Minolta Co., Ltd. Liquid crystal display device and driving method thereof
TW200737088A (en) * 2006-03-30 2007-10-01 Fujitsu Ltd Driving method of display element and display device
TW200816132A (en) * 2006-09-29 2008-04-01 Fujitsu Ltd Display element, method of image overwriting in display element, and electronic paper as well as electronic terminal using display element
JP2008181157A (en) * 2008-04-01 2008-08-07 Konica Minolta Holdings Inc Method for driving liquid crystal display element, and liquid crystal display device
CN102622976A (en) * 2011-02-01 2012-08-01 财团法人工业技术研究院 Bistable active matrix display device and driving method of display panel thereof
CN103165063A (en) * 2011-12-14 2013-06-19 财团法人工业技术研究院 Active matrix type multistable display device and driving method of display panel thereof

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000147466A (en) * 1998-11-17 2000-05-26 Minolta Co Ltd Method for driving liquid crystal display element and information display device
US6927765B1 (en) * 1998-11-17 2005-08-09 Minolta Co., Ltd. Liquid crystal display device and driving method thereof
US20010024188A1 (en) * 2000-02-17 2001-09-27 Minolta Co., Ltd. Liquid crystal display driving method and liquid crystal display device
CN1417770A (en) * 2001-11-02 2003-05-14 那纳须株式会社 Cholesterol type liquid crystal plate display and its driver
TW200737088A (en) * 2006-03-30 2007-10-01 Fujitsu Ltd Driving method of display element and display device
WO2007116448A1 (en) * 2006-03-30 2007-10-18 Fujitsu Limited Method for driving display element and display device
TW200816132A (en) * 2006-09-29 2008-04-01 Fujitsu Ltd Display element, method of image overwriting in display element, and electronic paper as well as electronic terminal using display element
JP2008181157A (en) * 2008-04-01 2008-08-07 Konica Minolta Holdings Inc Method for driving liquid crystal display element, and liquid crystal display device
CN102622976A (en) * 2011-02-01 2012-08-01 财团法人工业技术研究院 Bistable active matrix display device and driving method of display panel thereof
CN103165063A (en) * 2011-12-14 2013-06-19 财团法人工业技术研究院 Active matrix type multistable display device and driving method of display panel thereof

Similar Documents

Publication Publication Date Title
JP5200209B2 (en) Liquid crystal display
US7602361B2 (en) Electro-optical device, driving circuit, method, and apparatus to clear residual images between frames and precharge voltage for subsequent operation
JP2008003609A (en) Liquid crystal display device and driving method therefor
US8063875B2 (en) Electrooptic device, scanning-line driving circuit, method for driving the same, and electronic device
JP2001166280A (en) Driving method for liquid crystal display device
WO2006013502A1 (en) Improved scrolling function in an electrophoretic display device
US20080079710A1 (en) Electrooptic device and method for driving the same
US8629879B2 (en) Electrophoretic display controller providing PIP and cursor support
US20060139302A1 (en) Method for driving an active matrix liquid crystal display
US8054262B2 (en) Circuit for stabilizing common voltage of a liquid crystal display device
US20060125813A1 (en) Active matrix liquid crystal display with black-inserting circuit
JP2006018138A (en) Driving method of flat surface display panel and flat surface display
US20070070011A1 (en) Active matrix liquid crystal display and driving method thereof
KR100389027B1 (en) Liquid Crystal Display and Driving Method Thereof
US8723896B2 (en) Driver IC, panel driving system, and panel driving method
JP4115099B2 (en) Display device
JP3863729B2 (en) Display device
WO2013024776A1 (en) Display device and drive method for same
JP4759906B2 (en) Liquid crystal display device, control method thereof, and portable terminal
CN113948046A (en) Driving module for active matrix driving cholesterol liquid crystal display device and driving method thereof
CN113971941A (en) Driving module for active matrix driving cholesterol liquid crystal display device and driving method thereof
JP2002169514A (en) Liquid crystal display and display method for the same
CN113674709A (en) Driving module for active matrix driving cholesterol liquid crystal display device and driving method thereof
KR101136793B1 (en) LCD and driving method thereof
US20050073349A1 (en) Voltage level transferring circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20220118

WD01 Invention patent application deemed withdrawn after publication