阅读说明：本技术 一种液晶显示装置及其控制方法、应用 (liquid crystal display device and control method and application thereof ) 是由 林健源 历志辉 于 2018-06-08 设计创作，主要内容包括：本发明公开一种液晶显示装置及其控制方法、应用,其中,所述液晶显示装置包括依次叠层设置的第一液晶面板、第二液晶面板及背光模组,所述第一液晶面板及第二液晶面板与同一信号源相接。本发明解决了现有技术中现有技术中液晶显示面板对比度不高的问题。(The invention discloses a liquid crystal display device and a control method and application thereof, wherein the liquid crystal display device comprises a first liquid crystal panel, a second liquid crystal panel and a backlight module which are sequentially arranged in a laminated manner, and the first liquid crystal panel and the second liquid crystal panel are connected with the same signal source. The invention solves the problem that the contrast ratio of the liquid crystal display panel in the prior art is not high.)

1. The liquid crystal display device is characterized by comprising a first liquid crystal panel, a second liquid crystal panel and a backlight module which are sequentially arranged in a laminated mode, wherein the first liquid crystal panel and the second liquid crystal panel are connected with the same signal source.

2. The liquid crystal display device according to claim 1, wherein the first liquid crystal panel is a in-plane field switching mode liquid crystal panel, and the second liquid crystal panel is a multi-domain vertical alignment liquid crystal panel.

3. The liquid crystal display device according to claim 1, wherein the first liquid crystal panel comprises an upper polarizing plate, a first upper glass substrate, a color filter, a first alignment layer, a first liquid crystal layer, a first lower glass substrate, and a first lower polarizing plate, which are stacked, and the second liquid crystal panel layer comprises a second upper glass substrate, a second alignment layer, a second liquid crystal layer, a second lower glass substrate, and a second lower polarizing plate, which are stacked.

4. The liquid crystal display device according to claim 3, wherein the first liquid crystal panel and the second liquid crystal panel are the same size.

5. The liquid crystal display device according to claim 3, wherein the resolution of the second liquid crystal panel is less than or equal to the resolution of the first liquid crystal panel.

6. The liquid crystal display device according to claim 3, wherein the subpixels of the first liquid crystal panel correspond to the subpixels of the second liquid crystal panel one to one.

7. The liquid crystal display device of claim 3, wherein the first alignment layer and the second alignment layer both use rubbing alignment technology.

8. The liquid crystal display device according to claim 3, wherein the upper polarizing plate and the first lower polarizing plate have polarization angles perpendicular to each other, and the first lower polarizing plate and the second lower polarizing plate have the same polarization angle.

9. A method for controlling a liquid crystal display device as claimed in any one of claims 1 ~ 8, comprising the steps of:

And controlling the sub-pixels of the first liquid crystal panel and the corresponding sub-pixels of the second liquid crystal panel to receive the same gray scale signals.

10. Use of the liquid crystal display device according to claim 1 ~ 8, wherein the liquid crystal display device is used in a mobile phone, a computer, a tablet, or a television.

Technical Field

The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display device and a control method and application thereof.

Background

The liquid crystal display panel has the characteristics of rich colors, good reliability, mature technology and relatively low cost, and is the most widely applied display panel at present. The structure of a conventional lcd panel used in a display device at present is shown in fig. 1, and includes an upper polarizer, a lower polarizer, an upper glass substrate, a lower glass substrate, a color filter, an alignment layer, and liquid crystal. However, the current lcd panel has some defects that the response time is slow, the viewing angle is narrow, the power consumption is high, the contrast is low, and the like, which are difficult to overcome, and the main reasons of the lcd panel are that as shown in fig. 2 (where an arrow indicates a light direction), the sub-pixels are in an off state or an on state, the light fluxes entering the two sub-pixels from the lower polarizer are the same and the light scattering from the adjacent sub-pixels exists, and due to the existence of the optical rotation property of the liquid crystal, the sub-pixels which should be turned off still have light leakage, which causes serious light leakage in a dark state, so that the contrast is low, the color is not pure, and the saturation is low. In addition, the conventional lcd panel must use photo-alignment technology to obtain relatively high contrast, which makes the manufacture complicated, the cost is high, and the yield is low.

Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

in view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a liquid crystal display device, a control method thereof, and an application thereof, which are intended to solve the problem of low contrast of the liquid crystal display panel in the prior art.

The technical scheme of the invention is as follows:

A liquid crystal display device comprises a first liquid crystal panel, a second liquid crystal panel and a backlight module which are sequentially arranged in a laminated mode, wherein the first liquid crystal panel and the second liquid crystal panel are connected with the same signal source.

In the liquid crystal display device, the first liquid crystal panel is a planar field switching mode liquid crystal panel, and the second liquid crystal panel is a multi-domain vertical alignment liquid crystal panel.

The liquid crystal display device comprises a first liquid crystal panel, a second liquid crystal panel and a liquid crystal display, wherein the first liquid crystal panel comprises an upper polarizing plate, a first upper glass substrate, a color filter, a first alignment layer, a first liquid crystal layer, a first lower glass substrate and a first lower polarizing plate which are arranged in a laminated mode, and the second liquid crystal panel layer comprises a second upper glass substrate, a second alignment layer, a second liquid crystal layer, a second lower glass substrate and a second lower polarizing plate which are arranged in a laminated mode.

The first liquid crystal panel and the second liquid crystal panel have the same size.

The liquid crystal display device, wherein the resolution of the second liquid crystal panel is less than or equal to the resolution of the first liquid crystal panel.

In the liquid crystal display device, the sub-pixels of the first liquid crystal panel correspond to the sub-pixels of the second liquid crystal panel one to one.

In the liquid crystal display device, the first alignment layer and the second alignment layer both adopt a rubbing alignment technology.

In the liquid crystal display device, the polarization angles of the upper polarizing plate and the first lower polarizing plate are perpendicular to each other, and the polarization angles of the first lower polarizing plate and the second lower polarizing plate are the same.

A method for controlling the liquid crystal display device as described above, comprising the steps of:

And controlling the sub-pixels of the first liquid crystal panel and the corresponding sub-pixels of the second liquid crystal panel to receive the same gray scale signals.

an application of the liquid crystal display device is described above, wherein the liquid crystal display device is applied to a mobile phone, a computer, a panel or a television.

Has the advantages that: according to the liquid crystal display device provided by the invention, the two liquid crystal display panels are arranged in a laminated manner, the backlight module is arranged on one side of the display panel, then the two liquid crystal display panels are controlled to be connected with a signal source, and the two liquid crystal display panels are simultaneously controlled to synchronously display through the signal source, so that under the action of the two liquid crystal display panels, the contrast ratio of the emergent light color can be effectively improved, the emergent light color is improved, and the problem of low contrast ratio of the liquid crystal display panels in the prior art is solved.

Drawings

Fig. 1 is a schematic structural diagram of a conventional liquid crystal display panel.

Fig. 2 is a schematic diagram illustrating the operation principle of a conventional lcd panel.

Fig. 3 is a schematic structural diagram of a preferred embodiment of the liquid crystal display device according to the present invention.

Fig. 4 is a schematic structural diagram of a first lcd panel according to a preferred embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a second lcd panel according to a preferred embodiment of the present invention.

Detailed Description

The present invention provides a liquid crystal display device, a control method thereof, and an application thereof, and the present invention will be described in further detail below in order to make the objects, technical solutions, and effects of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

a liquid crystal display device, as shown in FIG. 3, comprises a first liquid crystal panel 100, a second liquid crystal panel 200 and a backlight module 300 which are sequentially stacked, wherein the first liquid crystal panel 100 and the second liquid crystal panel 200 are connected with a same signal source, and then two layers of liquid crystal display panels are controlled to synchronously display, so that dark state light leakage can be greatly reduced, and contrast is effectively improved.

The first liquid crystal panel 100 may be a planar field switching mode liquid crystal panel or a multi-domain vertical alignment liquid crystal panel, and the second liquid crystal panel 200 may also be a planar field switching mode liquid crystal panel or a multi-domain vertical alignment liquid crystal panel. Preferably, the first liquid crystal panel 100 is a planar field switching mode liquid crystal panel, the second liquid crystal panel 200 is a multi-domain vertical alignment liquid crystal panel, because the second liquid crystal panel 200 mainly functions to control the light incident amount and improve the contrast, and the first liquid crystal panel 100 mainly functions to display the final image, improve the problem of narrow viewing angle and improve the brightness, and the planar field switching liquid crystal panel has a better viewing angle and the multi-domain vertical alignment liquid crystal panel has a higher contrast, so that the first liquid crystal panel 100 is a planar field switching mode liquid crystal panel and the second liquid crystal panel 200 is a multi-domain vertical alignment liquid crystal panel, which can obtain a higher contrast, a better color purity and a larger visual angle.

Specifically, in the liquid crystal display device, as shown in fig. 4, the first liquid crystal panel 100 includes an upper polarizing plate 101, a first upper glass substrate 102, a color filter 103, a first alignment layer 104, a first liquid crystal layer 105, a first lower glass substrate 106, and a first lower polarizing plate 107, which are stacked, and as shown in fig. 5, the second liquid crystal panel 200 includes a second upper glass substrate 201, a second alignment layer 202, a second liquid crystal layer 203, a second lower glass substrate 204, and a second lower polarizing plate 205, which are stacked. It can be seen that the second liquid crystal panel 200 reduces the number of color filters compared to the first liquid crystal panel 100, and the second liquid crystal panel 200 prevents light leakage in a dark state due to light leakage of the sub-pixels that should be turned off due to the optical rotation of the liquid crystal, thereby improving the light transmission contrast, and the color filters are not affected in the realization of the functions thereof, and the structure is more compact.

Because the present invention provides the finally presented image contrast and color purity by controlling the first liquid crystal panel 100 and the second liquid crystal panel 200 to display synchronously by the same signal source, the first liquid crystal panel 100 and the second liquid crystal panel 200 are set to have the same length and width dimensions in order to obtain better image quality and to facilitate accurate control of the first liquid crystal panel 100 and the second liquid crystal panel 200. More preferably, the resolution of the second liquid crystal panel 200 is less than or equal to the resolution of the first liquid crystal panel 100. Preferably, the resolution of the second liquid crystal panel 200 is equal to the resolution of the first liquid crystal panel 100, and the sub-pixels of the first liquid crystal panel 100 correspond to the sub-pixels of the second liquid crystal panel 200 one by one, so that the backlight intensity received by each sub-pixel of the first liquid crystal panel can be adjusted.

The signals of the first liquid crystal panel 100 and the second liquid crystal panel 200 are both from the same chip, the first liquid crystal panel 100 and the second liquid crystal panel 200 can synchronously display different gray scales according to different input signals, and the backlight enters the luminous flux of the first liquid crystal panel 100 and then exits through the second liquid crystal panel 200, so that the accurate control and synchronous control are realized. If the sub-pixels adjacent to the full-bright sub-pixel of the second liquid crystal panel 200 are in the off state, only a very small portion of light enters the first liquid crystal panel 100, and since the light must pass through the low transmittance layers such as the polarizing plates (including the first lower polarizing plate and the upper polarizing plate) and the color filter layer after entering the first liquid crystal panel 100, almost no light finally leaks from the off sub-pixel region.

Taking a 65 inch 4K 8bits liquid crystal panel as an example, at present, the transmittance of the first liquid crystal panel is about 5.5%, the transmittance of the color filter layer is about 30%, the transmittance of the second liquid crystal panel is about 27% because of no color filter layer, and the contrast of the first liquid crystal panel is about 5000. Assuming that the backlight brightness is 4000nits, L255=4000 × 8% =320nits, and L0=320/1800=0.18nits in the conventional lcd panel (the structure of the conventional lcd panel is the same as that of the first lcd panel), that is, when the red/green/blue pixel is turned on, there is still mixed stray light of green & blue/red & green. If the liquid crystal display device of the present invention is used, L255=4000 × 27% × 5.5% =59.4nits, since the combined effect of the two liquid crystal panels L0 approaches 0, that is, when the red/green/blue pixel is turned on, there is substantially no mixed stray light of green & blue/red & blue/red & green, and the contrast ratio can reach 1000000:1 or more; since the L255 luminance is low, the backlight luminance can be increased appropriately.

Furthermore, in the liquid crystal display device of the present invention, the first alignment layer 104 and the second alignment layer 202 both adopt a rubbing alignment technique, so that the device structure is simple to manufacture, and the manufacturing cost is reduced while the manufacturing yield is improved.

In the liquid crystal display device, the polarization angles of the upper polarizer 101 and the first lower polarizer 107 are perpendicular to each other, and the polarization angles of the first lower polarizer 107 and the second lower polarizer 205 are perpendicular to each other.

A method for controlling the liquid crystal display device as described above, comprising the steps of:

And controlling the sub-pixels of the first liquid crystal panel and the corresponding sub-pixels of the second liquid crystal panel to receive the same gray scale signals. The sub-pixels of the first liquid crystal panel and the corresponding sub-pixels of the second liquid crystal panel are controlled to synchronously receive the same gray scale signals for on-off control, so that the contrast can be improved, and the image can be displayed clearly with fuller color saturation.

Specifically, the high and low voltages of the second liquid crystal panel, i.e., the voltage ranges corresponding to L255 and L0, are controlled to be wide enough, the voltage range of L255 should be set to avoid image sticking and consider the power consumption requirement and the IC driving capability, the gamma of the second liquid crystal panel should be set to 2.2, because the final display device gamma is based on the gamma of the first liquid crystal panel, and the gray level setting voltage of the whole liquid crystal device should make the frequency spectrum change between the gray levels as small as possible, i.e., the closer the frequency spectrum of the L0 ~ L254 gray level is to the frequency spectrum of L255, and in addition, after the frequency spectrum of each gray level is changed through the second liquid crystal panel, after the frequency spectrum of each gray level is adjusted, the gamma and chromaticity of the first liquid crystal panel are adjusted, and at this time, the gamma and the control of each gray level is within a range of 2.0 ~ 2.4.4, preferably 2.2.2, and the chromaticity coordinates of each gray level are adjusted to the L255 as much as possible, e..

Specifically, the function required for image quality adjustment is shown in formula (1):

（1）

That is, since the image quality displayed on the first liquid crystal panel is affected by the backlight, the adjustment of the second liquid crystal panel and the control of the first liquid crystal panel, the final displayed image and image quality need to be adjusted in cooperation with the relationship between the first liquid crystal panel and the second liquid crystal panel, and the influence of afterimage and the like also needs to be paid attention to when the voltage of the first liquid crystal panel is adjusted.

An application of the liquid crystal display device is described above, wherein the liquid crystal display device is applied to a mobile phone, a computer, a panel or a television.

Technical details and advantages relating to the control device and the storage medium have been set forth in detail in the above-described method and will not be described again here.

In summary, in the liquid crystal display device provided by the present invention, two liquid crystal display panels are stacked, and the backlight module is disposed on one side of the display panel, and then the two liquid crystal display panels are controlled to be connected to a signal source, and the two liquid crystal display panels are controlled to synchronously display through the signal source, so that under the action of the two liquid crystal display panels, the contrast of the light-emitting color can be effectively improved, the light-emitting color is improved, and the problem of low contrast of the liquid crystal display panel in the prior art is solved.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.