Patent Application
20160139442
Embodiments of the invention relate to a touch liquid crystal display device.
Touch liquid crystal display device is classified into a resistive type, a capacitive type and an electromagnetic type, etc. according to a touch screen it employs. The electromagnetic-type touch liquid crystal display device is widely used due to its high positioning accuracy and suitable for handwriting input.
In the conventional electromagnetic-type touch liquid crystal display device, a liquid crystal panel and a backlight are disposed in a mold frame, an electromagnetic screen is attached to the rear side of the backlight, and in this case, the mold frame may deform for bearing the weight of the liquid crystal panel and the backlight. In order to ensure the flatness of the electromagnetic screen, the mold frame needs to be thickened so as to increase the bearing capacity of the mold frame and further to reduce deformation of the mold frame. As a result, the overall thickness of the electromagnetic-type touch liquid crystal display device is increased.
Embodiments of the invention provide a touch liquid crystal display device. The touch liquid crystal display device includes: a backplate; a mold frame installed on the backplate; a liquid crystal panel installed on the mold frame; a bezel covering an edge of the liquid crystal panel, wherein the bezel is connected with the backplate; an optical film and a light source fixed between the backplate and the mold frame; and an electromagnetic screen disposed on the backplate.
In order to make objects, technical details and advantages of the embodiments of the invention apparent, the technical solutions of the embodiment will be described in a clearly and fully understandable way in connection with the drawings related to the embodiments of the invention. It is obvious that the described embodiments are just a part but not all of the embodiments of the invention. Based on the described embodiments herein, those skilled in the art can obtain other embodiment(s), without any inventive work, which should be within the scope of the invention.
As shown in
In
If the light source 7 is of side-type, the optical film includes a reflector sheet 3, a light guide plate 4, and a film member 5. The reflector sheet 3 is disposed on the electromagnetic screen 2, and the light guide plate 4 is disposed on the reflector sheet 3. The film member 5 includes a prism film, a diffusion sheet and the like, and the film member 5 is disposed on the light guide plate 4.
If the light source 7 is of direct-type, the light source 7 is disposed on the electromagnetic screen 2. The light source 7 is generally a light bar constituted by light emitting diodes or cold cathode fluorescent lamps. In this case, the optical film is just the film member 5, which is disposed between the light source 7 and the liquid crystal panel 6.
In more detail, in the touch liquid crystal display device as shown in
In the embodiment of the invention, the electromagnetic screen 2 is provided within the backplate 1. Compared with the mold frame 8, the material strength of the backplate 1 is high, i.e., the backplate 1 is capable of supporting the electromagnetic screen and the backlight with a less thickness. With such structure, the thickness of the mold frame 8 can be reduced, so that the thickness of the touch liquid crystal display device can be reduced.
In order to facilitate the installation and disassembly, the backplate 1 and the mold frame 8 are preferably engaged with each other. As shown in
Further, the touch liquid crystal display device may further include: an electromagnetic pen (not shown) cooperating with the electromagnetic screen 2. A magnetic field is generated on the surface of the electromagnetic screen when the electromagnetic screen is powered on, and a corresponding magnetic field is generated on the nib of the electromagnetic pen when the electromagnetic pen is input with an electrical current. When the nib of the electromagnetic pen and the electromagnetic screen approach to each other, positioning can be carried out to implement an information input with the pen. In addition, since the magnetic induction intensity is influenced by a distance, the electromagnetic pen may also implement a pressure-sensitive operation, that is, the lines drawn are of different thickness if the applied forces are different.
Further, the touch liquid crystal display device may further include: a touch screen attached on the liquid crystal panel. The touch screen may be a capacitive touch screen or a resistive touch screen, which may be selected according to the practical requirements. By providing the touch screen, the touch liquid crystal display device may achieve either the information input with the pen or the information input with the hand.
In the touch liquid crystal display device according to the embodiment of the invention, the backplate of high strength is adopted, and the electromagnetic screen and the backlight are disposed within the backplate. The mold frame merely bears the liquid crystal panel, which can reduce the load of the mold frame. Therefore, the thickness of the mold frame can be reduced, so that the thickness of the touch liquid crystal display device can be reduced.
The foregoing embodiments merely are exemplary embodiments of the invention, and not intended to define the scope of the invention, and the scope of the invention is determined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201310088263.8 | Mar 2013 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2013/076713 | 6/4/2013 | WO | 00 |
