TWI675233B - Liquid crystal display panel and display device - Google Patents

Abstract

A liquid crystal display panel includes a CF substrate and a TFT substrate opposite to each other, the TFT substrate having an extended area protruding from the CF substrate; a liquid crystal layer sandwiched between the CF substrate and the TFT substrate; A conductive layer is disposed on a side of the CF substrate away from the TFT substrate; a circuit board includes a connection end and an extension portion extending from one side portion of the connection end, and the extension portion is far from a surface of the TFT substrate A first ground pad is provided, and a surface of the first ground pad far from the TFT substrate and a surface of the first conductive layer far from the CF substrate are located on the same plane; a decorative film covering the first ground pad And at least part of the first conductive layer, and is electrically connected to the first conductive layer and the first ground pad. The invention also provides a display device using the liquid crystal display panel.

Description

Liquid crystal display panel and display device

The present invention relates to the field of display technology, and in particular, to a liquid crystal display panel and a display device.

A conventional liquid crystal display panel may cause a problem of liquid crystal afterimages because electrostatic charges are accumulated on a color filter (CF) substrate during a manufacturing process or in the environment. Therefore, it is necessary to provide an electrostatic protection structure, but the conventional electrostatic protection structure has a problem of uneven appearance.

An embodiment of the present invention provides a liquid crystal display panel including: a CF substrate; a TFT substrate disposed opposite to the CF substrate, the TFT substrate having an extended area protruding from the CF substrate; a liquid crystal layer, a clip It is provided between the CF substrate and the TFT substrate; a first conductive layer is provided on a side of the CF substrate away from the TFT substrate; a circuit board includes a connection end and a side portion extending from the connection end A first ground pad is provided on a surface of the extension portion away from the TFT substrate, the surface of the first ground pad away from the TFT substrate and the surface of the first conductive layer away from the CF substrate. Co-located; and A decorative film covering the first ground pad and at least a portion of the first conductive layer, and electrically connecting the first conductive layer and the first ground pad.

Another embodiment of the present invention also provides a display device using the above-mentioned liquid crystal display panel.

Since the surface of the first ground pad away from the TFT substrate and the surface of the first conductive layer away from the CF substrate are located on the same plane of the liquid crystal display panel provided by the embodiment of the present invention, the decorative film is electrically connected to the first After a ground pad and the first conductive layer, the appearance here remains flat.

100‧‧‧ display device

10‧‧‧LCD display panel

20‧‧‧ backlight module

30‧‧‧ plastic frame

11‧‧‧CF substrate

12‧‧‧TFT substrate

121‧‧‧ extended area

13‧‧‧LCD layer

14‧‧‧ the first conductive layer

15‧‧‧Circuit Board

150‧‧‧Connector

151‧‧‧ extension

153‧‧‧The first ground pad

155‧‧‧Second Grounding Pad

16‧‧‧Decorative film

17‧‧‧ support

18‧‧‧ second conductive layer

19‧‧‧ interval

21‧‧‧back plate

22‧‧‧Reflector

23‧‧‧light guide

231‧‧‧Interior

24‧‧‧ Optical film set

25‧‧‧Light source assembly

251‧‧‧light strip

252‧‧‧light source

FIG. 1 is a schematic perspective view of a display device according to a preferred embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view taken along the line II-II in Fig. 1.

FIG. 3 is a schematic cross-sectional view of the circuit board taken along the line III-III in FIG. 1.

Please refer to FIG. 1 and FIG. 2 in combination. FIG. 1 is a schematic perspective view of a display device according to a preferred embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along II-II in FIG. 1.

As shown in FIG. 1, the display device 100 includes a liquid crystal display panel 10 and a plastic frame 30 for accommodating and supporting the liquid crystal display panel 10. As shown in FIG. 2, the display device 100 further includes a backlight module 20 stacked on the liquid crystal display panel 10. The backlight module 20 provides the liquid crystal display panel 10 with a backlight required for display.

The liquid crystal display panel 10 includes a color filter (CF) substrate 11, a thin film transistor (TFT) substrate 12 disposed opposite the CF substrate 11, and a CF substrate 11 and a TFT substrate 12 sandwiched therebetween. Between the liquid crystal layer 13.

In this embodiment, the CF substrate 11 includes a glass substrate, a color filter layer formed on a surface of the glass substrate, and a first electrode layer, wherein the first electrode layer is disposed on the color filter layer. The color filter layer may include, for example, a black matrix and a plurality of color filter patterns. In one embodiment, the first electrode layer may be a common electrode, which may be made of a transparent conductive material, such as indium tin oxide (ITO) or indium-doped zine oxide (IZO). to make.

In this embodiment, the TFT substrate 12 includes scan lines and data lines arranged alternately, a thin film transistor array, and a second electrode layer. In one embodiment, each thin film transistor is disposed at the intersection of the scanning line and the data line. A minimum area defined by the adjacent two scanning lines and the adjacent two data lines defines a pixel area (not shown in the figure).示). The second electrode layer includes a plurality of pixel electrodes (not shown), and a pixel electrode is disposed in each pixel region. A driving electric field is formed between the first electrode layer and the second electrode layer to drive the liquid crystal molecules in the liquid crystal layer 13 to rotate.

Please continue to refer to FIG. 1, a side of the CF substrate 11 away from the TFT substrate 12 is provided with a first conductive layer 14. The first conductive layer 14 covers the entire surface of the CF substrate 11. The extension width of the TFT substrate 12 (along the thickness direction of the vertical liquid crystal display panel 10) is longer than that of the CF substrate 11, so that the TFT substrate 12 has an extension region 121 protruding from the CF substrate 11. The extension region 121 is provided with a second conductive layer 18.

As shown in FIG. 1, the liquid crystal display panel 10 further includes a circuit board 15. FIG. 3 is a schematic cross-sectional view of the circuit board taken along the line III-III in FIG. 1. Please refer to FIG. 3 together. The circuit board 15 includes a connecting end 150 and an extending portion 151 extending from one side of the connecting end 150. The connection end 150 and the extension portion 151 of the circuit board 15 are located in an area of the extension area 121 away from the CF substrate 11. A first ground pad 153 is provided on a surface of the extending portion 151 away from the TFT substrate 12.

Please continue to refer to FIGS. 1 and 3. The surface of the first ground pad 153 away from the TFT substrate 12 and the surface of the first conductive layer 14 away from the CF substrate 11 are located on the same plane. The connection end 150 faces toward the TFT substrate 12 A second ground pad 155 is formed on the surface, and the circuit board 15 is electrically connected to the second conductive layer 18 away from the CF substrate 11 through the second ground pad 155.

In this embodiment, when a static charge is accumulated on the surface of the TFT substrate 12, an electrostatic discharge path may be formed by the second conductive layer 18 and the second ground pad 155, so that the accumulated static charge on the surface of the TFT substrate 12 is exported.

In one embodiment, the material of the first conductive layer 14 and the second conductive layer 18 may be, but is not limited to, an indium tin oxide layer, an indium zinc oxide layer, a metal layer, a conductive adhesive layer, or a conductive tape. The first conductive layer 14 can be formed on the side of the CF substrate 11 away from the TFT substrate 12 by coating, plating or screen printing. The second conductive layer 18 can be formed on the side of the TFT substrate 12 near the CF substrate 11 by coating, plating or screen printing.

Referring to FIG. 2, the liquid crystal display panel 10 further includes a decoration film 16. The decoration film 16 has conductivity. The decoration film 16 covers the first ground pad 153 and extends from the first ground pad 153 to the first conductive layer 14 to cover at least part of the first conductive layer 14 and is electrically connected to the first conductive layer. 14 and the first ground pad 153 to form an electrostatic discharge path.

In one embodiment, the decorative film 16 may be a conductive adhesive layer or a conductive tape. When a static charge accumulates on the CF substrate 11 during the manufacturing process or in the environment, the accumulated static charge on the CF substrate 11 may be obtained by the first The conductive layer 14, the decoration film 16, and the first ground pad 153 form an electrostatic discharge path, thereby eliminating electrostatic interference and avoiding the problem of liquid crystal afterimage caused by the charge remaining on the CF substrate 11.

As shown in FIGS. 1 and 2, the surface of the first ground pad 153 away from the TFT substrate 12 and the surface of the first conductive layer 14 away from the CF substrate 11 are located on the same plane, that is, the surface of the first ground pad 153 away from the TFT substrate 12 It is highly flush with the surface of the first conductive layer 14 away from the CF substrate 11, so when the decorative film 16 covers and After the first conductive layer 14 and the first ground pad 153 are electrically connected, the appearance can be kept flat, thereby facilitating the lamination of the liquid crystal display panel 10 with the touch panel in subsequent processes.

After the decorative film 16 covers and electrically connects the first conductive layer 14 and the first ground pad 153, an end thereof covering the first ground pad 153 can be shortened to the plastic frame 30 of the liquid crystal display panel 10 without extending beyond the plastic frame 30. To reduce material loss.

As shown in FIG. 1 and FIG. 2, in this embodiment, since the connection end 150 and the extension portion 151 of the circuit board 15 are disposed in the extension area 121 away from the CF substrate 11, the first conductive layer 14 and the first ground pad 153 There is a gap 19 therebetween, and a support 17 for supporting the decorative film 16 is also provided in the gap 19. The surface of the support 17 away from the TFT substrate 12 and the surface of the first ground pad 153 away from the TFT substrate 12 and the surface of the first conductive layer 14 away from the CF substrate 11 are on the same plane. Therefore, the decoration film 16 covers and is electrically connected to the first After the conductive layer 14 and the first ground pad 153, the intermediate position is kept flat and will not collapse or bulge. In one embodiment, the support 17 may be black foam rubber.

In other embodiments, if the interval 19 between the first conductive layer 14 and the first ground pad 153 is small without causing the decorative film 16 to collapse at the interval 19, the support 17 may be omitted. In this embodiment, the circuit board 15 is a flexible circuit board. It can be understood that the circuit board 15 may also be a printed circuit board. In addition, the first ground pad 153 may be connected to a system ground line, or the rubber frame 30 of the display device 100 is used as a grounding component, and the first ground pad 153 is connected to the rubber frame 30 of the display device 100.

Please continue to refer to FIG. 2. In this embodiment, the backlight module 20 includes a back plate 21, a reflection sheet 22, a light guide plate 23, an optical film group 24 and a light source assembly 25. The reflection sheet 22, the light guide plate 23, and the optical film group 24 are sequentially mounted on the back plate 21 from bottom to top. The back plate 21 cooperates with the plastic frame 30 to fix the reflection sheet 22, the light guide plate 23, the optical film group 24 and the light source assembly 25.

As shown in FIG. 2, the light source assembly 25 includes a light strip 251 and a plurality of light sources 252 disposed on the light strip 251. In one embodiment, the optical film group 24 may include a plurality of optical films, such as a diffusion sheet, a brightness enhancement sheet, and a prism sheet. A light incident surface 231 is provided on one side of the light guide plate 23, a plurality of light sources 252 are disposed on one side of the light incident surface 231, and the plurality of light sources 252 are directly opposite the light incident surface 231. The light emitted by the plurality of light sources 252 enters the light guide plate 23 from the light incident surface 231, passes through the plurality of optical films of the optical film group 24, and is converted into a high-intensity and uniform backlight which is incident on the liquid crystal display panel 10, and the reflection sheet 22 Part of the light thereon is reflected back to the light guide plate 23 and then passes through the plurality of optical films of the optical film group 24 in order and finally reaches the liquid crystal display panel 10. In this embodiment, the light source 252 is a light emitting diode (LED).

The above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or equivalently replaced. Without departing from the spirit and scope of the technical solution of the present invention.

Claims (6)

An improvement of a liquid crystal display panel includes: a color filter (CF) substrate; and a thin film transistor (TFT) substrate, which is opposite to the CF substrate, and the TFT substrate has An extended area protruding from the CF substrate; a liquid crystal layer sandwiched between the CF substrate and the TFT substrate; a first conductive layer disposed on a side of the CF substrate away from the TFT substrate; a circuit board, It includes a connection end and an extension portion extending from one side of the connection end. A surface of the extension portion away from the TFT substrate is provided with a first ground pad, and the first ground pad is away from the surface of the TFT substrate. Located on the same plane as the surface of the first conductive layer away from the CF substrate; and a decorative film covering the first ground pad and at least part of the first conductive layer, and electrically connected to the first conductive layer A conductive layer and the first ground pad. The liquid crystal display panel according to claim 1, wherein a gap exists between the first conductive layer and the first ground pad, and a support for supporting the decorative film is also provided in the gap. The liquid crystal display panel according to claim 2, wherein the surface of the support far from the TFT substrate and the surface of the ground pad far from the TFT substrate are located on the same plane. The liquid crystal display panel according to claim 1, wherein a second ground pad is formed on a surface of the connection end facing the TFT substrate, a second conductive layer is provided in the extension area, and the circuit board passes through the second conductive layer. The second ground pad is electrically connected to the second conductive layer. The liquid crystal display panel according to claim 4, wherein the second ground pad and the second conductive layer are electrically connected to a position away from the CF substrate. A display device for a liquid crystal display panel as described in any one of application request items 1-5, wherein the display device further includes a backlight module which is stacked on the liquid crystal display panel, and the backlight module is the The liquid crystal display panel provides backlight required for display.