CN115064136B - Cholesterol liquid crystal display and driving method thereof - Google Patents

Abstract

The present invention provides a cholesteric liquid crystal display and a driving method thereof. The cholesteric liquid crystal display has a driving circuit that applies voltage to scanning lines and data lines to drive pixels. The driving circuit applies the first voltage and the second voltage to the data lines and the scan lines respectively in the first time section, applies the third voltage to the data lines and/or the fourth voltage to the scan lines in the second time section, and applies the third voltage to the data lines and/or the fourth voltage to the scan lines in the third time section. The time section applies the fifth voltage and the sixth voltage to the data line and the scan line respectively. The first voltage and the second voltage are high level, the sixth voltage and the fifth voltage are low level, the third voltage and the fourth voltage are The level is between high level and low level.

Description

Cholesterol liquid crystal display and driving method thereof

Technical field

The present invention relates to the field of display technology, a cholesteric liquid crystal display and a driving method thereof.

Background technique

As we all know, cholesterol liquid crystal displays are generally composed of multiple scan lines (Rows) and multiple data lines (Column) intersecting to form a passive matrix, where each scan line intersects with each data line. A pixel is formed, and this pixel generates different liquid crystal transitions and different gray scales through the voltage difference provided by the corresponding scan line and data line. Traditionally, the driving circuit of a cholesteric liquid crystal display applies voltage to the scan lines and data lines, and drives the pixels through the voltage difference between the scan lines and the data lines. Figure 1 is a schematic diagram of the prior art of the present invention. As shown in Figure 1, the driving circuit (not shown) applies levels V1 and V2 to the data line and scan line respectively in the first time period t1. The voltage difference between the two is V1-V2, and in the second time period t1 Section t2 applies levels V3 and V4 to the data line and scan line respectively. The voltage difference between the two is V3-V4, and the pixel is driven by the voltage difference between the two. Take the actual voltage as an example: V1=10V, V2=5V, V3=-10V, V4=-5V.

Since the cholesterol liquid crystal display needs to apply voltage to each scan line column by column when imaging, and when applying voltage to the current scan line, due to the rapid conversion of voltage and parasitic capacitance and other effects, it is easy to distort the previous scan line that has been imaged. The pixels cause electrical interference, thus causing color shift or cross talk problems.

Therefore, the main purpose of the present invention is to provide a cholesteric liquid crystal display and a driving method thereof to solve the above problems.

Contents of the invention

The object of the present invention is to provide a cholesteric liquid crystal display and a driving method thereof, which can improve the color shift or crosstalk caused by the electrical interference of the current scan line to the pixels of the previous scan line when the scan lines are turned on column by column, and enhance the User experience.

In order to achieve at least one of the above advantages or other advantages, an embodiment of the present invention proposes a driving method for a cholesteric liquid crystal display, which is suitable for a cholesteric liquid crystal display. The cholesteric liquid crystal display has scanning lines, data lines and pixels, so The driving method includes the following steps: applying a first voltage and a second voltage to the data line and the scan line respectively in the first time section; applying a third voltage to the data line and/or a fourth voltage to the scan line in the second time section. line; apply the fifth voltage and the sixth voltage to the data line and the scan line respectively in the third time section; wherein the first voltage and the second voltage are high level, and the sixth voltage and the fifth voltage are low level, The levels of the third voltage and the fourth voltage are between the high level and the low level, and the pixels are driven by the voltage difference applied to the scan line and the data line.

In order to achieve at least one of the above advantages or other advantages, another embodiment of the present invention provides a cholesteric liquid crystal display, including a driving circuit, a scanning line, a data line and a pixel. The scanning lines and data lines are electrically connected to the driving circuit, and the pixels are electrically connected to the scanning lines and data lines. The driving circuit applies the first voltage and the second voltage to the data lines and the scan lines respectively in the first time section, applies the third voltage to the data lines and/or the fourth voltage to the scan lines in the second time section, and applies the third voltage to the data lines and/or the fourth voltage to the scan lines in the second time section. The fifth voltage and the sixth voltage are applied to the data lines and the scan lines respectively in three time sections. The first voltage and the second voltage are high levels, the sixth voltage and the fifth voltage are low levels, the third voltage and the fourth voltage are applied to the data lines and the scan lines respectively. The voltage level is between high level and low level, and the pixel is driven by the voltage difference applied to the scan line and the data line.

In some embodiments, the third voltage is substantially equal to the fourth voltage.

In some embodiments, the third voltage is substantially different than the fourth voltage.

In some embodiments, the first time period is substantially equal to the third time period, and the second time period is no more than 20% of the first time period.

Therefore, using the cholesteric liquid crystal display and its driving method provided by the present invention, by applying the third voltage on the data line and/or the fourth voltage on the scan line, it is possible to improve the charge conversion caused by the rapid charge conversion when the scan line is successively turned on. The voltage interference of the pixels in a scanning line improves the color cast or cross talk problem of traditional cholesterol LCD displays.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other beneficial effects of the present invention can be achieved and obtained by the structures particularly pointed out in the specification, claims, etc.

Description of the drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts; in the following description, the positional relationships described in the drawings, Unless otherwise specified, the directions of the components in the illustrations are used as the basis.

Figure 1 is a schematic diagram of the prior art of the present invention;

Figure 2 is a schematic diagram of a cholesterol liquid crystal display according to an embodiment of the present invention;

Figure 3 is a schematic waveform diagram of scan lines, data lines and pixels according to an embodiment of the present invention;

FIG. 4 is a flow chart of a method for driving a cholesteric liquid crystal display according to an embodiment of the present invention.

Reference signs:

200: Cholesterol LCD

20: Drive circuit

21: Data line

22: Scan line

23: pixels

t1～t4: first to fourth time period

V1～V8: first to eighth voltage

401～403: Steps

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, not all of them; the technical features designed in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments of the present invention, All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the present invention, it should be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", " The orientations or positional relationships indicated by "bottom", "inner", "outside", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the device or device to which it is referred. Components must have a specific orientation, or be constructed and operate in a specific orientation and are therefore not to be construed as limitations of the invention. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined as “first” and “second” may explicitly or implicitly include one or more of the described features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, the term "include" and any variations thereof mean "including at least".

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. The connection, or the integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

FIG. 2 is a schematic diagram of a cholesteric liquid crystal display according to an embodiment of the present invention. As shown in FIG. 2 , the cholesteric liquid crystal display 200 includes a driving circuit 20 , a scanning line 21 , a data line 22 and a pixel 23 . It should be noted that the cholesteric liquid crystal display 200 depicted in FIG. 2 should further include a plurality of scan lines 21 and data lines 22 and more pixels 23 constructed by the intersections of the scan lines and data lines. In this embodiment, Only one of each is drawn for representation.

FIG. 3 is a schematic diagram of waveforms of scan lines, data lines and pixels according to an embodiment of the present invention. Please refer to FIG. 2 and FIG. 3 . The driving circuit 20 applies the first voltage V1 and the second voltage V2 to the data line 21 and the scanning line 22 respectively in the first time period t1, and applies the third voltage respectively in the second time period t2. V3 and the fourth voltage V4 are applied to the data line 21 and the scanning line 22, and the fifth voltage V5 and the sixth voltage V6 are respectively applied to the data line 21 and the scanning line 22 during the third time period t3. For example, the first voltage V1 and the second voltage V2 are at a high level, the sixth voltage V6 and the fifth voltage V5 are at a low level, and the levels of the third voltage V3 and the fourth voltage V4 are between the high level and the low level. During this time, the pixel 23 is driven by the voltage difference applied to the data line 21 and the scanning line 22 . For example, V1=10V, V2=5V, V3=V4=0V, V5=-10V, V6=-5V. In this embodiment, the driving circuit 20 further applies the seventh voltage V7 and the eighth voltage V8 to the data line 21 and the scan line 22 respectively in a fourth time period t4.

Please continue to refer to Figure 3. Apply voltage to the data line 21 and the scan line 22 according to the above method. The corresponding waveform of the pixel 23 is as shown in the bottom of Figure 3. It can be seen that when the pixel 23 is in the second time period t2, Due to the third voltage V3 and the fourth voltage V4 applied to the data line 21 and the scan line 22 respectively, a transition level will appear in the middle of the transition from the high level to the low level. This transition level can be when the voltage changes. A buffering effect is produced between them, thereby reducing the voltage interference to the pixels in the imaged area. Although the detailed examples of this embodiment are as above, those of ordinary skill in the art will know that at least one of the third voltage V3 and the fourth voltage V4 can be applied to the corresponding data line/scan line at the second time, and can also be applied at t2 and t4 At least one of the two time sections applies the corresponding voltage to the data line/scan line according to the aforementioned method, as long as the pixel voltage can be transferred from a high level to a low level and/or from a low level to a high level. When a turning point occurs in the process, the effect of the present invention can be achieved.

It should be noted that in the embodiment of the present invention, the third voltage V3 and the fourth voltage V4 can be substantially the same level (for example, 0V) as shown in FIG. 3 , but in other embodiments, they can also be Substantially different levels, the logical levels of the two only need to be between the high level and the low level. Similarly, the seventh voltage V7 and the eighth voltage V8 may be substantially the same level (for example, 0V) as shown in FIG. 3 , but may also be substantially different levels in other embodiments. Secondly, The logic level of the user only needs to be between the high level and the low level.

It should be noted that in the embodiment of the present invention, the first time section t1 is substantially equal to the third time section t3, and the second time section t2 does not exceed 20% of the first time section t1. For example, as shown in FIG. 3 , the first time section t1 and the third time section t3 are each 5 time units, while the second time section t2 is no more than 1 time unit.

FIG. 4 is a flow chart of a method for driving a cholesteric liquid crystal display according to an embodiment of the present invention. As shown in Figure 4, a method for driving a cholesteric liquid crystal display according to an embodiment of the present invention includes steps 401-404. The driving method of a cholesteric liquid crystal display according to an embodiment of the present invention is applicable to the cholesteric liquid crystal display as shown in FIG. 2 . Step 401: Apply a first voltage and a second voltage to the scan line and the data line respectively during the first time period. Step 402: Apply a third voltage and a fourth voltage to the scan line and the data line respectively during the second time period. Step 403: Apply the fifth voltage and the sixth voltage to the scan line and the data line respectively in the third time period, wherein the first voltage and the second voltage are high level, and the sixth voltage and the fifth voltage are low level. , the levels of the third voltage and the fourth voltage are between the high level and the low level.

To sum up, by using the driving method of the cholesteric liquid crystal display provided by the present invention, by increasing the imaging phase time in the non-full-frame update mode, the liquid crystal can have more time to obtain the energy required for rotation, so it can improve the performance of the cholesteric liquid crystal display. The color difference problem caused by full-frame and non-full-frame update modes brings users a better user experience.

In addition, those skilled in the art should understand that although there are many problems in the prior art, each embodiment or technical solution of the present invention can only be improved in one or several aspects, without having to simultaneously solve the problems in the prior art or All technical issues listed in the background art. Those skilled in the art will understand that content that is not mentioned in a claim shall not be used as a limitation on the claim.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention. scope.

Claims (8)

1. A driving method for a cholesteric liquid crystal display, suitable for a cholesteric liquid crystal display, the cholesteric liquid crystal display having scanning lines, data lines and pixels, characterized in that the driving method includes: applying a first voltage and a second voltage to the data line and the scan line respectively during a first time period; applying a third voltage to the data line and/or a fourth voltage to the scan line during a second time period; and Applying a fifth voltage and a sixth voltage to the data line and the scan line respectively in a third time period; Wherein, the first voltage and the second voltage are at a high level, the sixth voltage and the fifth voltage are at a low level, and the levels of the third voltage and the fourth voltage are between Between the high level and the low level, the pixel is driven by the voltage difference applied to the scan line and the data line. 2. The driving method of claim 1, wherein the third voltage is substantially equal to the fourth voltage. 3. The driving method of claim 1, wherein the third voltage is substantially different from the fourth voltage. 4. The driving method according to claim 1, wherein the first time section is substantially equal to the third time section, and the second time section does not exceed the first time section. 20%. 5. A cholesterol liquid crystal display, characterized by comprising: Drive circuit; Scan lines, electrically connected to the drive circuit; A data line, electrically connected to the driving circuit; and Pixels, electrically connected to the scan lines and the data lines; The driving circuit applies a first voltage and a second voltage to the data line and the scan line respectively in a first time section, and applies a third voltage to the data line and/or the scan line in a second time section. Four voltages are applied to the scan lines, and a fifth voltage and a sixth voltage are respectively applied to the data lines and the scan lines in a third time period, and the first voltage and the second voltage are high levels, The sixth voltage and the fifth voltage are low levels, the levels of the third voltage and the fourth voltage are between the high level and the low level, and the pixel is formed by Driven by a voltage difference applied to the scan line and the data line. 6. The cholesteric liquid crystal display of claim 5, wherein the third voltage is substantially equal to the fourth voltage. 7. The cholesteric liquid crystal display of claim 5, wherein the third voltage is substantially different from the fourth voltage. 8. The cholesteric liquid crystal display of claim 5, wherein the first time period is substantially equal to the third time period, and the second time period does not exceed the first time period. 20%.