CN100430787C - Double-layer display panel, flat panel display thereof and image display method after shutdown - Google Patents

Abstract

The invention discloses a double-layer display panel, which comprises a first display panel and a second display panel. The second display panel is positioned in the image display direction of the first display panel and comprises a second lower substrate with a plurality of thin film transistors and a second upper substrate with a transparent electrode; and a cholesterol liquid crystal layer between the second lower substrate and the second upper substrate.

Description

Double-layer display panel and its flat-panel display and its image display method after shutdown

technical field

The invention relates to a display panel, in particular to a double-layer display panel, a plane display using the technology and an image display method after shutdown.

Background technique

Cathode ray tubes (CRTs) have been widely used in television displays, measuring instruments and information terminals. However, due to its size and mass, cathode ray tube technology cannot meet the growing demand for lightweight and compact displays. Therefore, other thin and compact displays, such as liquid crystal display (LCD) using photoelectric effect, plasma display (PDP) using gas discharge, and electroluminescent display (ELD) using electroluminescent effect to display images, are developing rapidly. Replaced cathode ray tubes.

Today's thin flat panel displays are used in a wide range of applications, such as monitors for aircraft or spacecraft, as well as monitors for notebook computers, laptop computers, desktop computers, and large-size displays. Therefore, society's demand for thin flat panel displays has been continuously increasing.

On the other hand, the thin flat panel display has become a more popular product type at present along with the increase of people's demand for large-screen TVs and the greater degree of freedom it can provide in interior decoration. However, the size of thin flat-panel displays is getting bigger and bigger, but when the TV is turned off, the dark picture displayed on the screen is always inconsistent with the indoor furnishings, especially when a large-screen wall-mounted TV is turned off, the big black picture It is inevitable that there will be an abrupt feeling on the wall. Taking LCD TV as an example, when the TV is turned off and the display panel loses the voltage to align the liquid crystals, the light cannot pass through the liquid crystal layer and the picture will appear pitch black.

Therefore, it is expected that there will be a new flat panel display design that can provide solutions to the above problems.

Contents of the invention

The technical problem to be solved by the present invention is to provide a double-layer display panel, a flat-panel display using such a double-layer display panel and an image display method after it is turned off, so that the image displayed after the flat-panel display is turned off is no longer monotonous and dark It is not a picture, but a colorful picture that can be freely selected by the user and presented perfectly.

In this way, the flat-panel display can present an image after it is turned off, and the content of the image can be selected arbitrarily without power consumption. When this technology is applied to a TV, the wall-mounted TV can become an ornament that can match the wall surface and interior decoration, not just as a TV for viewing.

Therefore, in order to achieve the above object, a double-layer display panel disclosed in the present invention includes a first display panel and a second display panel. The first display panel has a first lower substrate and a first upper substrate; the second display panel is located in the image display direction of the first display panel, and includes a second lower substrate with a plurality of thin film transistors and a transparent electrode. the second upper substrate; and a cholesteric liquid crystal layer interposed between the second lower substrate and the second upper substrate; a main controller for capturing and storing the display images of the first display panel.

Therefore, in order to achieve the above object, the present invention discloses a method for displaying an image of a flat-panel display after shutdown. The flat-panel display has a double-layer display panel consisting of a first display panel and a second display panel. The second display panel The cholesteric liquid crystal layer is used and located in the image display direction of the first display panel. The method comprises the following steps: when the first display panel displays an image, obtain and store the image displayed on the first display panel according to an instruction issued by a user; Two display panels are displayed.

The above-mentioned first display panel and the second display panel have the same resolution.

The detailed features and advantages of the present invention are described in detail below in the embodiments, the content of which is sufficient to enable any person of ordinary skill in the art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the claims and With the accompanying drawings, any person skilled in the art can easily understand the related objects and advantages of the present invention.

Description of drawings

Fig. 1 is the three-dimensional schematic diagram of the general structure of a preferred embodiment of the present invention;

Fig. 2 is the side view of the general structure of the first preferred embodiment of the present invention;

Fig. 3 is the side view of the general structure of the second preferred embodiment of the present invention;

FIG. 4 is a flow chart of the method for displaying images after the flat-panel display is turned off according to the present invention.

Among them, reference signs:

1 The first display panel 3 The second display panel

5 second lower substrate 7 second upper substrate

9 Thin film transistor 11 The first lower substrate

13 Transparent electrode 15 Polarizing plate

17 The first upper substrate 19 Liquid crystal layer

21 thin film transistor 23 transparent electrode

25 Liquid crystal layer 27 The first lower substrate

29 The first upper substrate 31 Electrodes

33 electrode 35 dielectric layer

37 Dielectric layer 39 Phosphor

Detailed ways

In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the detailed description of the embodiments is as follows. The above descriptions about the content of the present invention and the following descriptions of the embodiments are used to demonstrate and explain the principle of the present invention, and provide further explanations on the patent application scope of the present invention.

At present, the commonly used flat-panel displays only include a display panel, which is only used for video playback or image display. The types of existing display panels include Thin Film Transistor Liquid Crystal Display (TFT-LCD), plasma display (Plasma Display Panel) , PDP), Light Emitting Diode Display (Light Emitting Diode Display), Electro-Luminescence Display (Electro-Luminescence Display, ELD), Field Emission Display (Field Emission Display, FED) or other flat display panels with similar application effects.

The idea of the present invention is to add a thin film transistor liquid crystal display (Thin film transistor liquid crystal display, TFT-LCD) as a second display panel on the first display panel used to play movies or display images in the original flat panel display, to The whole constitutes a double-layer display panel or further constitutes a new flat display.

Wherein the additional thin film transistor liquid crystal display adopts cholesteric liquid crystal as its liquid crystal layer material. Because cholesteric liquid crystal has bistable state (no power consumption) and 360-degree wide viewing angle, and the second display panel has a second control circuit (not shown) separate from the first display panel, therefore, using Or when playing movies or pictures on the flat-panel display, the cholesterol-type (cholesteric) liquid crystal layer (not shown) can be controlled to a fully open state through the second control circuit (not shown), so that it will not affect the first display panel and before the flat-panel display is turned off, the pre-displayed image after shutdown can be selected in advance and memorized, so as to control the display of the second display panel through the second control circuit after shutdown. Therefore, the flat-panel display of the present invention can still be used for displaying pictures or images after being turned off.

Fig. 1 is a perspective schematic diagram of a general structure of a preferred embodiment of the present invention.

For the convenience of describing the present invention, only the first display panel 1 and the second display panel 3 located on the first display panel 1 are briefly shown in the figure. The second display panel 3 includes a second lower substrate 5 and a second upper substrate 7 with a liquid crystal layer 25 (shown in FIG. 2 ) sandwiched between the two substrates. The liquid crystal layer 25 is composed of cholesteric liquid crystal.

As mentioned above, there are many types of display panels that can be used as flat-panel displays at present, and it is impossible to describe them one by one in this specification. As an example of the first display panel, how the present invention utilizes the second display panel including a cholesteric liquid crystal layer to form a double-layer display panel or further form a new type of flat panel display. In other words, although this specification only uses liquid crystal display and plasma display as the first display panel to illustrate the present invention, these examples should have met the requirements for disclosure of the best embodiment in examination and subsequent rights enforcement.

Fig. 2 is a side view of the general structure of the first preferred embodiment of the present invention.

In the figure, the first preferred embodiment of the present invention includes a first display panel 1 and a second display panel 3 . In this preferred embodiment, a liquid crystal display panel is taken as an example. The first display panel 1 may include a first lower substrate 11 having a thin film transistor 9 , and a first upper substrate 17 having a transparent electrode 13 and a polarizer 15 . A liquid crystal layer 19 is sandwiched between the first upper substrate 17 and the first lower substrate 11 .

The second display panel 3 located on the first display panel 1 is a liquid crystal display panel, and may include a second lower substrate 5 with thin film transistors 21 and a second upper substrate 7 with transparent electrodes 23 . The second lower substrate 5 is adjacent to and combined with the upper structure of the first display panel 1 . A liquid crystal layer 25 is sandwiched between the second upper substrate 7 and the second lower substrate 5, and the liquid crystal layer 25 is composed of cholesteric liquid crystal.

In addition, each of the first display panel 1 and the second display panel 3 has its corresponding first control circuit and second control circuit (not shown).

Wherein, the combination of the cholesteric liquid crystal layer 25 and the first display panel 1 needs to consider the resolution matching, so that the thin film transistor circuit 21 of the second lower substrate 5 corresponds to the thin film transistor circuit 9 of the first lower substrate.

When the resolutions of the first display panel 1 and the second display panel 3 do not match each other, the display image after power-off obtained through the first display panel 1 and its control circuit needs to go through a conversion process to meet the resolution of the second display panel 3 resolution. This conversion process can be done by a converter or software.

In addition, the first upper substrate 17 , the second lower substrate 5 and the second upper substrate 7 are all required to be transparent substrates for the first display panel 1 and the second display panel 3 to display images.

Moreover, the present invention includes a main controller (not shown in the figure), which can be connected to the first control circuit (not shown in the figure) and the second control circuit (not shown in the figure) or combined into a single circuit, and activated on the first display panel 1 , control the second control circuit (not shown) to adjust the cholesteric liquid crystal layer of the second display panel 3 to a fully open state to transmit light; so that the user can capture any picture in the display screen of the flat-panel display, or Select any stored picture in the image storage device. After the flat-panel display is turned off, it is sent to the second display panel 3 and displayed.

Fig. 3 is a side view of the general structure of the second preferred embodiment of the present invention.

In the figure, the second preferred embodiment of the present invention includes a first display panel 1 and a second display panel 3 . In this preferred embodiment, a DC type plasma display panel is taken as an example, and the first display panel may include a first lower substrate 27 and a first upper substrate 29 . The electrodes 31 on the first upper substrate 29 and the electrodes 33 on the first lower substrate 27 are arranged crosswise, each of the first upper substrate 29 and the first lower substrate 27 has a dielectric layer 35, 37, and the first lower substrate 27 The dielectric layer 37 has phosphors 39 on it.

Similarly, the second display panel 3 located on the first display panel 1 is a liquid crystal display panel, which may include a second lower substrate 5 with thin film transistors 21 and a second upper substrate 7 with transparent electrodes 23 . The second lower substrate 5 is adjacent to and combined with the upper structure of the first display panel 1 . A liquid crystal layer 25 is sandwiched between the second upper substrate 7 and the second lower substrate 5, and the liquid crystal layer 25 is composed of cholesteric liquid crystal.

In addition, each of the first display panel 1 and the second display panel 3 has its corresponding first control circuit and second control circuit (not shown). And it can also include a main controller (not shown in the figure), which can connect the first control circuit and the second control circuit or combine them into a single circuit. When the first display panel 1 is activated, it controls the second control circuit to turn the second display panel The cholesteric liquid crystal layer 25 of 3 is adjusted to a fully open state to transmit light; so that the user can capture any picture in the display screen of the flat-panel display, or select any stored picture in the image storage device. After the flat-panel display is turned off, it is sent to the second display panel 3 and displayed.

Among them, the combination of the cholesteric liquid crystal layer 25 and the first display panel 1 needs to consider the matching of the resolution, so that the thin film transistor circuit 21 of the second lower substrate 5 and the X-Y electrodes 31, 33 of the first upper substrate 29 and the first lower substrate 27 The intersection arrays correspond to each other. However, when the resolutions of the first display panel 1 and the second display panel 3 do not match each other, a converter can be added to convert the display image after shutdown obtained through the first display panel 1 and its control circuit into a display image that is compatible with the second display panel. 3 resolutions.

If the thin film transistor circuit of the flat panel display panel produces electric field interference, the thin film transistor control circuit of the cholesteric liquid crystal must be reversely corrected.

FIG. 4 is a flowchart of a method for displaying an image after the flat panel display is turned off according to the present invention.

When the flat-panel display is playing normally, that is, when the second control circuit is controlled to be closed and the cholesteric liquid crystal layer is fully opened, an image displayed on the first display panel 1 is obtained. The source of the image displayed on the first display panel 1 can be a card reader or a general image. source (such as a remote TV station, a near-end DVD/VCD player, etc.) and a digital camera (step 401); store the image in a storage device, which can be built into the flat-panel display or externally connected form (step 402); when the flat-panel display is turned off, the first display panel 1 does not display a picture for a period of time, or the first control circuit is turned off, an image stored in the storage device is displayed through the second control circuit through the second control circuit The panel 3 is displayed (step 403); after no power is supplied, the selected image will still stay on the flat panel display because the cholesteric liquid crystal layer 25 has a bistable (no power consumption) characteristic.

The image displayed in the storage device can be obtained by the user by pressing a button to capture the screen being played on the flat-panel display, or by inputting an image storage device. The image storage device is, for example, a flash drive, an SD card, or any other memory device that can store pictures and images.

According to the above description about the present invention, it can be found that when the flat panel display is turned on and used, the thin film transistor control circuit of the cholesteric liquid crystal will be closed, so that the cholesteric liquid crystal layer is controlled in a fully open state (100% fully open), and the cholesteric liquid crystal It has the characteristics of 360-degree wide viewing angle, so it does not affect the normal viewing of flat-panel displays. In addition, when the flat-panel display is turned off or the first display panel does not display any image for a period of time, the main controller can control the second display panel to display the image in the storage device, and because the cholesteric liquid crystal has a bistable (no power consumption) characteristic , so the selected image will remain on the screen when no power is supplied. This image can be pre-selected by the user or randomly selected.

According to the above, the flat panel display can display a beautiful picture after it is turned off, instead of just a dark and monotonous picture.

Although the present invention is disclosed above with the foregoing embodiments, they are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes and modifications made belong to the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended claims.

Claims (12)

1. A double-layer display panel, characterized in that it comprises: a main controller, used to capture and store the display screen of the first display panel; A first display panel having a first lower substrate and a first upper substrate; A second display panel, located in the image display direction of the first display panel, the second display panel includes: a second lower substrate with a plurality of thin film transistors and a second upper substrate with transparent electrodes; a cholesteric liquid crystal layer, interposed between the second lower substrate and the second upper substrate. 2. The double-layer display panel as claimed in claim 1, wherein the main controller is configured to control the cholesteric liquid crystal layer to be fully open to transmit light when the first display panel is started. 3. The double-layer display panel as claimed in claim 1, wherein the main controller is configured to control the second display panel to display the stored display images when the first display panel is turned off. 4. The double-layer display panel as claimed in claim 1, wherein both the second lower substrate and the second upper substrate are transparent substrates. 5. The double-layer display panel as claimed in claim 1, wherein the first display panel is a liquid crystal display panel. 6. The double-layer display panel as claimed in claim 1, wherein the first display panel is a plasma display panel. 7. The double-layer display panel as claimed in claim 1, wherein the first display panel and the second display panel have the same resolution. 8. A flat panel display comprising the double-layer display panel as claimed in claim 1. 9. A method for displaying images after a flat-panel display is turned off. The flat-panel display has a double-layer display panel consisting of a first display panel and a second display panel. The second display panel uses a cholesteric liquid crystal layer and is located on the In the image display direction of the first display panel, the method is characterized in that it includes the following steps: When the first display panel displays an image, according to an instruction issued by a user, obtain and store an image displayed on the first display panel; When the machine is turned off, one of the multiple stored images is selected to be displayed on the second display panel. 10. The method for displaying images after the flat panel display is turned off as claimed in claim 9, wherein the first display panel and the second display panel have the same resolution. 11. A method for displaying images after a flat-panel display is turned off. The flat-panel display has a double-layer display panel consisting of a first display panel and a second display panel. The second display panel uses a cholesteric liquid crystal layer and is located on the In the image display direction of the first display panel, the method is characterized in that it includes the following steps: When the first display panel displays an image, the cholesteric liquid crystal layer is fully opened; When the first display panel does not display an image, turn on the second display panel and display an image displayed by the first display panel; shutdown. 12. The method for displaying images after the flat panel display is turned off as claimed in claim 11, wherein the first display panel and the second display panel have the same resolution.

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