Cholesterol liquid crystal display device

Abstract

The present application discloses a cholesteric liquid crystal display device, which includes a liquid crystal display panel and a liquid crystal driving unit. The liquid crystal display panel has a plurality of pixels. The liquid crystal driving unit applies a row driving voltage and a column driving voltage to a specified pixel according to an input signal. After the input signal is transmitted, the liquid crystal driving unit starts a voltage reduction signal in a time period to reduce the row driving voltage and the column driving voltage applied to the specified pixel. Thus, the crosstalk phenomenon of the cholesteric liquid crystal display device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal display, and in particular, to a cholesteric liquid crystal display device. BACKGROUND

[0002] The cholesteric liquid crystal display is a kind of liquid crystal display, wherein the cholesteric liquid crystal has bistable characteristics: that is, there are two stable states in the state without external force, which is the biggest difference from the TFT liquid crystal display and OLED display commonly used today.

[0003] The cholesteric liquid crystal molecule arrangement has two stable states of focal conic state and planar state, so it has bistable characteristics, that is, the cholesteric liquid crystal can maintain the original liquid crystal molecule arrangement state without additional energy from the outside world. When a voltage is applied, the arrangement state of the cholesteric liquid crystal molecules can be controlled to switch between the two stable states of focal conic state and planar state.

[0004] The current cholesteric liquid crystal display usually has a Crosstalk problem, which interferes with the picture display state. For example, in the handwriting mode driving mode, as the handwriting is continuously input, after writing from a pixel A, a certain time interval is set, and then writing in another pixel B, at this time, there is still voltage accumulated on the row voltage and column voltage corresponding to the pixel A. Over time, the accumulation becomes more and more, which will cause Crosstalk, so that the unselected pixels also show a certain display state.

[0005] Therefore, the main purpose of the present application is to provide a cholesteric liquid crystal display device to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a cholesteric liquid crystal display device, which can improve the Crosstalk phenomenon on the cholesteric liquid crystal display device, avoid the unselected pixels also showing a display state, and ensure the display performance of the cholesteric liquid crystal display device.

[0007] To achieve at least one of the above advantages or other advantages, an embodiment of the present application provides a cholesteric liquid crystal display device. The cholesteric liquid crystal display device includes a liquid crystal display panel and a liquid crystal driving unit.

[0008] The liquid crystal display panel has a plurality of pixels. The liquid crystal driving unit is coupled to the liquid crystal display panel, which applies a row driving voltage and a column driving voltage to a specified pixel according to an input signal, and starts a voltage reduction signal to reduce the row driving voltage and the column driving voltage applied to the specified pixel within a certain time period after the input signal is transmitted.

[0009] In some embodiments, the voltage-lowering signal corresponds to a 0V voltage circuit, so that the row driving voltage and the column driving voltage corresponding to the specified pixel are zeroed.

[0010] In some embodiments, the 0V voltage circuit is realized by grounding.

[0011] In some embodiments, the starting time of the time period is the time point when the input signal is completely transmitted.

[0012] In some embodiments, the ending time of the time period is the starting time point when the next input signal starts to be input.

[0013] In some embodiments, the time period is within the time interval of adjacent two input signals.

[0014] In some embodiments, the time period is less than or equal to 2ms.

[0015] In some embodiments, the input signal corresponds to a handwriting input or a character input.

[0016] In some embodiments, the liquid crystal display panel is a color cholesteric liquid crystal display panel.

[0017] Therefore, by using the cholesteric liquid crystal display device provided by the present application, the Crosstalk phenomenon on the cholesteric liquid crystal display device is improved by the setting of the voltage-lowering signal generated by the liquid crystal driving unit, and the unselected pixels also present a display state is avoided, so that the display performance of the cholesteric liquid crystal display device is ensured.

[0018] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are listed, and the detailed description is as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 is a schematic diagram of the cholesteric liquid crystal display device of the present application;

[0021] Figure 2 is Figure 1 the operation schematic diagram of the cholesteric liquid crystal display device shown.

[0022] Reference numerals: 10 - cholesterol liquid crystal display device; 12 - liquid crystal display panel; 14 - liquid crystal driving unit; 142 - column voltage controller; 144 - row voltage controller; V1 - column driving voltage; V2 - row driving voltage; V3 - corresponding voltage of step-down signal; t - time period. DETAILED DESCRIPTION

[0023] The specific structural and functional details disclosed herein are merely representative for purposes of describing the exemplary embodiments of the present application. The present application, however, can be embodied in many alternatives, and should not be construed as being limited only to the embodiments set forth herein.

[0024] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or components referred to must have a particular orientation, or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. In addition, the terms "first", "second" are merely for the purpose of description, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more. In addition, the term "comprising" and any variations thereof mean "at least including".

[0025] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The terms used herein are merely used to describe specific embodiments and are not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular form "a", "an", "the" as used herein is also intended to include the plural. It should also be understood that the terms "including" and / or "containing" as used herein specify the existence of the stated features, integers, steps, operations, units and / or components, and do not exclude the presence or addition of one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0027] Referring to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of a cholesteric liquid crystal display device 10 according to the present application, Figure 2 is Figure 1 is a schematic diagram of the operation of the cholesteric liquid crystal display device 10 shown in FIG. 1. To achieve at least one of the above advantages or other advantages, an embodiment of the present application provides a cholesteric liquid crystal display device 10. As shown in the figure, the cholesteric liquid crystal display device 10 includes a liquid crystal display panel 12 and a liquid crystal driving unit 14. Further looking, the liquid crystal driving unit 14 includes a column voltage controller 142 and a row voltage controller 144.

[0028] The liquid crystal display panel 12 has a plurality of pixels. In an embodiment, the liquid crystal display panel 12 can be a color cholesteric liquid crystal display panel 12.

[0029] The liquid crystal driving unit 14 is coupled to the liquid crystal display panel 12, which applies a row driving voltage V2 and a column driving voltage Vl to a designated pixel according to an input signal, and when the input signal is completely transmitted, the liquid crystal driving unit 14 starts a voltage reduction signal within a time period t to reduce the row driving voltage V2 and the column driving voltage Vl applied to the designated pixel, eliminating the accumulated voltage. The column voltage controller 142 is used to output the column driving voltage Vl, and the row voltage controller 144 is used to output the row driving voltage V2. In an embodiment, the voltage reduction signal corresponds to a 0V voltage circuit, so that the row driving voltage V2 and the column driving voltage Vl corresponding to the designated pixel are zeroed; preferably, the 0V voltage circuit can be realized by grounding.

[0030] In an embodiment, the start time of the time period t is the time point when the input signal is completely transmitted. In an embodiment, the end time of the time period t can be the start time point of the next input signal. In an embodiment, the time period t is within the time interval of adjacent two input signals; preferably, the time period t is less than or equal to 2ms. For example, assuming that the first input signal and the second input signal are separated by 10 minutes, then the time period t can at least include the following cases: 1, the start time of the time period t is the end time point of the first input signal, and the end time of the time period t is the start time point of the second input signal, and the real time point t is also 10 minutes; 2, the start time of the time period t is the end time point of the first input signal, and the time period t ends after 2ms; 3, the time period t is any time period less than or equal to 2ms within 10 minutes.

[0031] For example, as Figure 1 and Figure 2As shown, when writing from position C, the liquid crystal driving unit 14 applies the row driving voltage V2 and the column driving voltage V1 to the specified pixel at position C according to the input signal; after the handwriting input is completed (i.e. the input signal is transmitted), the liquid crystal driving unit 14 starts the voltage reduction signal, that is, performs grounding operation, and the corresponding voltage V3 of the voltage reduction signal is 3.3V in the time period t, so that the output voltage of the column voltage controller 142 and the row voltage controller 144 to the specified pixel is 0, so that the clamping voltage at position C only generates bias voltage in the handwriting driving time, thereby improving the Crosstalk phenomenon on the cholesteric liquid crystal display device 10.

[0032] Similarly, if position D is written again, the voltage reduction signal is in the off state when the input signal exists, and the liquid crystal driving unit 14 applies the row driving voltage V2 and the column driving voltage V1 to the specified pixel, and when the input signal is transmitted, the liquid crystal driving unit 14 starts the voltage reduction signal to control the output voltage of the column voltage controller 142 and the row voltage controller 144 to be zero, so as to eliminate the accumulated voltage.

[0033] Overall, the corresponding voltage V3 of the voltage reduction signal has two states: when the corresponding voltage V3 of the voltage reduction signal is started, the column voltage controller 142 and the row voltage controller 144 are grounded, so that the output voltage of the row driving voltage V2 and the column driving voltage V1 is 0V; when the corresponding voltage V3 of the voltage reduction signal is off, the row driving voltage V2 and the column driving voltage V1 apply normal voltage to the specified pixel. The voltage reduction signal can be high level start and low level off, or low level start and high level off. In the embodiment, as shown, the corresponding voltage V3 of the voltage reduction signal is started when it is in high level and is off when it is in low level. Preferably, the corresponding voltage V3 of the voltage reduction signal is controlled by a small voltage controller, and the voltage of the high level is between 1.8-5V, and preferably 3.3V, and the voltage of the low level is 0V. Figure 2

[0034] In an embodiment, the input signal corresponds to handwriting input or character input. The character input can be input mode through a keyboard, a touch screen keyboard, or a virtual keyboard.

[0035] In summary, the cholesteric liquid crystal display device 10 provided by the present application improves the Crosstalk phenomenon on the cholesteric liquid crystal display device 10 by generating the voltage reduction signal of the liquid crystal driving unit 14, avoids that the unselected pixels also show the display state, and ensures the display performance of the cholesteric liquid crystal display device 10.

[0036] ​The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make some changes or modifications to the above disclosed methods and technical contents to make equivalent embodiments with equivalent changes, but as long as the changes or modifications do not deviate from the technical solutions of the present application, and any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present application are still within the scope of the technical solutions of the present application.

Claims

1. A cholesterol liquid crystal display device, characterized in that, The cholesterol liquid crystal display device includes: A liquid crystal display panel with multiple pixels; A liquid crystal driving unit, coupled to the liquid crystal display panel, applies a row driving voltage and a column driving voltage to a first designated pixel based on a previously written input signal. After the previously written input signal has been transmitted, the liquid crystal driving unit activates a buck signal for a period of time to reduce the row driving voltage and column driving voltage applied to the first designated pixel. The liquid crystal driving unit then applies another row driving voltage and another column driving voltage to a second designated pixel based on a subsequently written input signal. After the subsequent input signal has been transmitted, the liquid crystal driving unit activates the buck signal for another period of time to reduce the row driving voltage and column driving voltage applied to the second designated pixel. The step-down signal corresponds to a 0V voltage circuit, so that the row driving voltage and column driving voltage corresponding to the specified pixel are returned to zero.

2. The cholesterol liquid crystal display device as described in claim 1, characterized in that, The 0V voltage circuit is achieved by grounding.

3. The cholesterol liquid crystal display device as described in claim 1, characterized in that, The start time of the time period is the point in time when the input signal transmission is completed.

4. The cholesterol liquid crystal display device as described in claim 3, characterized in that, The time period is less than or equal to 2ms.

5. The cholesterol liquid crystal display device as described in claim 1 or 3, characterized in that, The end time of the time period is the starting time point when the next input signal begins to be input.

6. The cholesterol liquid crystal display device as claimed in claim 1, characterized in that, The input signal corresponds to handwriting input.

7. The cholesterol liquid crystal display device as claimed in claim 1, characterized in that, The input signal corresponds to character input.

8. The cholesterol liquid crystal display device as claimed in claim 1, characterized in that, The liquid crystal display panel is a color cholesteric liquid crystal display panel.

9. The cholesterol liquid crystal display device as claimed in claim 1, characterized in that, The time period is within the time interval between two adjacent input signals.

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