This application claims priority for China patent application no. 201510198341.9 filed on Apr. 23, 2015, the content of which is incorporated by reference in its entirely.
1. Field of the Invention
The present invention relates to a touch control technology, particularly to a touch control device able to overcome the rimple phenomenon resulting from directly laminating the touch control panel to the liquid crystal display module.
2. Description of the Related Art
Owing to advance of science and technology, portable electronic products, such notebook computers, tablet computers and smart phones, are extensively used in daily life. With increasing dependency of users, the function of portable electronic products is growing more and more powerful. All these products feature a display screen to present video information. The current tendency is to provide a larger touch control screen to enable consumers to operate these products more easily.
A touch control panel normally comprises a cover lens and a sensor film or a sensor glass. For the next generation touch control technology, low cost and compactness are the main considerations thereof. The OGS (One Glass Solution) technology integrates the cover lens with the sensor film or sensor glass. Thus, only a single piece of cover lens is superimposed on the display panel in the OGS technology. Therefore, the manufacturers pay much attention to the OGS technology.
However, directly laminating a touch panel to a liquid crystal display module is likely to induce a rimple phenomenon. There are many themes involving the rimple problem, and many prior arts proposed various schemes to solve the problem. The conventional touch control screen adopts a glossy polarizing plate to guarantee that the screen has high brightness. However, the glossy polarizing plate is likely to induce rimples affecting the resolution in touch control operations. Therefore, a China patent No.CN201689238 proposed a dull-polished polarizing plate, not only providing high-brightness and high-resolution polarizing plate but also solving the rimple problem.
Another China patent No.CN203069814 proposed a method of using a release film to fabricate a polarizing plate to solve the problem that the conventional polarizing plate is likely to have indentations or blisters in cutting and the problem that the product using the conventional polarizing plate is likely to have the rimple phenomenon in operation.
The abovementioned solutions still have many problems to overcome in practical application. The abovementioned solutions is not directed to the structural problem but only addressed to the polarizing plate. One of the primary factors causing the rimple phenomenon is the elevation difference in the structure of the LCD (Liquid Crystal Display) module. The prior arts did not solve the problem of elevation difference. Even though the touch control device is improved using the abovementioned schemes, the extent of improvement is limited because the elevation difference still persists in the structure. As the manufacturers normally adopt standardized LCD (Liquid Crystal Display) module structures, it is hard to significantly vary the structures of LCD modules. Further, the elevation difference originates from the integration of the touch control panel and the LCD module. Merely varying the structure of one of them is hard to solve the problem of elevation difference. Besides, the numerous elements in the touch control panel and the LCD module further increase the difficulty of varying the designs of them. Therefore, the manufacturers are still beset by the rimple problem and eager to have an effective solution thereof, which not only can integrate with the existing structure and process but also can satisfy the requirement of low cost.
The primary objective of the present invention is to provide a touch control device to effectively overcome the rimple problem originating from the current full-lamination technology so as to solve the abovementioned conventional problems.
To achieve the abovementioned objective, the present invention proposes a touch control device, which comprises a liquid crystal display (LCD) module, a touch control panel, and a thickness-increasing unit. The LCD module includes a display region and a control circuit region neighboring the display region. Normally, the control circuit region is slightly lower than the display region. The touch control panel is disposed above and joined with the display region and the control circuit region. The thickness-increasing unit is interposed between the touch control panel and the control circuit region of the LCD module, whereby the touch control panel can be smooth laminated to the LCD module, wherefore the rimple problem is effectively solved.
In one embodiment, the thickness-increasing unit is integrated with a ground tape or an optical adhesion layer, whereby the process of the present invention can be integrated with the existing process. Therefore, the present invention achieves the objective of eliminating rimples, neither adding too many fabrication steps nor increasing too much fabrication cost.
Below, embodiments are described in detail to make easily understood the objectives, technical contents, characteristics and accomplishments of the present invention.
Refer to
The touch control device of the present invention comprises a liquid crystal display (LCD) module 10, a touch control panel 20 and a thickness-increasing unit 30. The LCD module 10 includes a glass layer 11, a color filter layer 12 disposed above the glass layer 11, an upper polarizing plate 14 disposed above the color filter layer 12, a lower polarizing plate 13 disposed below the glass layer 11, and a backlight module 15 disposed below the lower polarizing plate 13, which jointly forms a display region. The glass layer 11 extends outward to receive a control circuit region. The control circuit region includes at least one control integrated circuit (IC) 16, a circuit protection device 17 shielding the control IC 16, and a ground tape 18 disposed on the circuit protection device 17 and extended to a ground terminal.
The touch control panel 20 is joined with the display region and the control circuit region of the LCD module 10. In other words, the touch control panel 20 is full laminated to the LCD module 10. It is obviously shown
Therefore, the present invention interposes the thickness-increasing unit 30 between the touch control panel 20 and the control circuit region of the LCD module 10 to increase the elevation of the control circuit region having a lower elevation and eliminate the elevation difference therebetween. Thus, the upper polarizing plate 14 and the circuit protection device 17 have an identical elevation or an almost identical elevation. In practical application, the thickness of the thickness-increasing unit 30 is about 0.01-0.25 μm. Then, the touch control panel 20 can be smooth laminated to the LCD module 10. Therefore, the original structural drop is no more likely to cause the rimple problem.
Refer to
Refer to
Normally, the touch control panel 20 is laminated to the LCD module 10 with an optical adhesion layer 21. In one embodiment, the optical adhesion layer 21 is an optical clear adhesive (OCA) or an optical clear resin (OCR). The thickness-increasing unit 30 is disposed on the bottom of the optical adhesion layer 21 to increase the thickness of the area of the optical adhesion layer 21, which is adjacent to the control circuit region, and eliminate the structural drop of the control circuit region and the display region, whereby the touch control panel 20 can be smooth applied to the LCD module 10.
In one embodiment, the thickness-increasing unit 30 is made of a material identical or similar to the material of the optical adhesion layer 21. In one embodiment, the thickness-increasing unit 30 is integrated with the optical adhesion layer 21 to form a one-piece component so as to further decrease the fabrication steps, wherein the optical adhesion layer 21 is designed to be a two-stage layer, as shown in
In comparison with the conventional technology, the touch control device of the present invention can effectively solve the rimple problem in almost the same cost and features simple structure, easy fabrication and high commercial competitiveness.
The embodiments described above are only to exemplify the present invention but not to limit the scope of the present invention. Any equivalent modification or variation according to the characteristic or spirit of the present invention is to be also included within the scope of the present invention.
Number | Date | Country | Kind |
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201510198341.9 | Apr 2015 | CN | national |