1. Field of the Invention
The present invention relates to a liquid crystal display (LCD) device. In particular, the present invention relates to a LCD device with less warm-up time.
2. Description of the Prior Art
The liquid crystal device (LCD) has replaced the traditional ray tube (CRT) to be one of the indispensable electronic devices of our daily lives and has been a huge success commercially. The liquid crystal device has many advantages over the traditional ray tube, such as a smaller dimension, larger in size and higher brightness. Also, the liquid crystal device can be used both interiorly and exteriorly. However, the optical properties of the liquid crystal device are seriously influenced by the panel temperature. According to various researches, the viscosity of the liquid crystal molecular is adversely proportional to the panel temperature. Such relationship renders the obvious dynamic ghost shadow of the liquid crystal device due to the high viscosity under relatively lower temperature, such as from cold turn-on or in a colder surrounding. The obvious dynamic ghost shadow causes the users trouble. Generally speaking, the dynamic ghost shadow begins to fade away in accordance with the lowering of the viscosity after the liquid crystal device has been running for tens of minutes, and eventually the presentation of the images reaches a steady state. The time duration from the initiation to reaching a steady state is called the warm-up time. There are many known techniques for the improvement of the presentation of the images by shorting the warm-up time.
For example, U.S. Pat. No. 7,023,519 provides an ITO heater for a liquid crystal display. When the surrounding temperature is too low, some heat has to be pumped in to bring the temperature of the device to a reasonable value. Please refer to
Accordingly, a novel liquid crystal display panel is needed to shorten the warm-up time. Such liquid crystal display panel in one aspect should not only maintain an ideal thickness of the liquid crystal display but also no additional energy should be consumed in order to speed up the warm-up time.
The present invention therefore proposes a novel liquid crystal display panel with shorter warm-up time. The advantages of the liquid crystal display panel of the present invention lies in the shorter warm-up time without consuming additional energy in order to speed up the warm-up time. In addition, the liquid crystal display panel of the present invention with shorter warm-up time maintains the ideal thickness of the liquid crystal display, too.
The present invention first provides a liquid crystal device. The liquid crystal device includes an illumination device generating heat, a side frame including a recess for fixing the illumination device, a liquid crystal device panel fixed to the side frame and a resilient heat-conductive element accommodated in the recess and contacting the illumination device and the LCD panel.
The present invention further provides another liquid crystal display device. The liquid crystal display device of the present invention includes a backlight module (BLM) which generates heat, a liquid crystal display panel disposed on the backlight module, a housing for fixing the liquid crystal display panel and the backlight module and at least one resilient heat-conducting element for selectively conducting the heat generated from the backlight module toward the liquid crystal display panel.
The present invention employs the wasted heat of the light source device as the heat source to heat up the liquid crystal display panel. This ingenious design not only reduces the total energy consumption of the liquid crystal device to meet the demand of the global issue of being “environmentally friendly”, but also solves the dissipation problem of the wasted heat from the light source device to expect a longer operational life time. Furthermore, because there is no extra part which may adversely affect the total thickness of the liquid crystal device, the liquid crystal display device of the present invention may maintain an ideal thickness, too. Moreover, the liquid crystal display panel of the present invention includes no additional device to raise the cost of production or to make the production line more complicated.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
The present invention provides a novel liquid crystal display panel. The liquid crystal display panel of the present invention has shorter warm-up time by employing the wasted heat of the illumination device as the heat source to heat up the liquid crystal display panel. The liquid crystal display panel of the present invention solves the dissipation of the wasted heat from the illumination device to expect a longer operational life time because of an ingenious design to reduce the total energy consumption of the liquid crystal device to meet the demand of the global issue of being “environmentally friendly” by employing the wasted heat of the illumination device as the heat source to heat up the liquid crystal display panel. Furthermore, because there is no extra part which may adversely affect the total thickness of the liquid crystal device, the liquid crystal display panel of the present invention may maintain an ideal thickness, too. Moreover, the liquid crystal display panel of the present invention includes no additional device to raise the cost of production or to make the production line more complicated.
The light source device 210 starts to generate heat once turned on. The regular liquid crystal display device is equipped with an additional heat-dissipating module to avoid the accumulation of the wasted heat. A back light module (BLM) may include the light source device 210 and the side frame 220. The light source device 210 may include a light source and an inverter to drive the circuit for the light source. Generally speaking, both the light source and the inverter generate heat. Suitable light sources for use in the light source device 210 may be, for example, the cold cathode fluorescent lamp (CCFL), the external electrode fluorescent lamp (EEFL) or the light emitting diode. The side frame 220 may further include at least one recess for fixing the light source device.
The housing is used for fixing the elements, for example the light source/the inverter of the light source device 210, the side frame 220, the liquid crystal display panel 230 and the resilient heat-conducting element 240. The housing may be a (side) frame and includes a plurality of recesses to fixate various elements of the back light module. In addition, the housing may further include other devices, such as a latch, to fixate various elements of the liquid crystal display device 200 of the present invention. The side frame 220 may be made of materials such as metal, plastics, or the combination thereof.
The resilient heat-conducting element 240 is preferably resilient and conductive. In one aspect, elasticity keeps the light source device 210 from any damage and thermal conductivity renders the wasted heat selectively guided to the liquid crystal display panel 230. The resilient heat-conducting element 240 may include resin, rubber, plastics, silicone or the combination thereof. For example, the powdered thermal conductive material may be mixed with the resin, the rubber, the plastics or the silicone to make the resilient heat-conducting element 240 suitable for the present invention. Depending on the light source and the inverter, the liquid crystal display device 200 of the present invention may include at least one resilient heat-conducting element 240 so that the wasted heat generated from the back light module can be selectively conducted to the liquid crystal display panel 230.
As shown in
On the other hand, in another preferred embodiment of the present invention, a thermal conductive element 231 is on the liquid crystal display panel 230, as shown in
When the resilient heat-conducting element 240 conducts the wasted heat to the liquid crystal display panel 230 after the light source device 210 is turned on, the decreased speed of the viscosity of the liquid crystal molecular in the liquid crystal display panel is accelerated and the liquid crystal display device 200 enters the steady state sooner to dramatically cut down the warm-up time. Preferably, the liquid crystal display panel 230 of the present invention may reach a steady state of 40° C.-80° C. with several minutes. For example, the temperature of the CCFL may further drop to about 78° C. from about 98.3° C.
Please refer to
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention.
Number | Date | Country | Kind |
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097215597 | Aug 2008 | TW | national |