TW573205B - Transflective backlight module for liquid crystal display device - Google Patents

Description

573205 V. Description of the invention (1) The invention of the invention The invention relates to a transflective-type backlight module for a liquid crystal display (LCD, Liquid Crystal Displays), particularly Refers to a semi-transparent and semi-reflective liquid crystal display that uses a "cold cathode flat fluorescent lamp" (CCFFL) and can fully utilize ambient light sources to achieve power saving purposes Backlight module. F. Description of Known Technology Generally, the transmission modes of liquid crystal displays according to light can be divided into three types: reflective type, transmissive type, and transflective type. The "reflective liquid crystal display" uses ambient light (ambient 1 ight) to illuminate a combination of a reflective panel (ref lector) and a "rear polarizer" (rear ρ ο 1 arizer) to achieve the purpose of lighting, Therefore, this "reflective liquid crystal display" is suitable for outdoor or bright indoor environment, and because it uses "ambient light" without turning on the light, it can save power. This is the advantage of "reflective liquid crystal display". However, in the case where the ambient light is relatively dim, such a "reflective liquid crystal display" cannot perform its display function, which is a disadvantage. Secondly, the "transmissive display" has a transparent "back polarizer" that does not reflect ambient light, so it needs a "back light" to display it, so this type of transmissive liquid crystal display does not have a reflective plate. Therefore, this "transmissive LCD" is suitable for low light

Page 4 of 573205 V. Description of the invention (2) When the environment where the light is continuously on is clear and inevitable, this type of "penetrating moxibustion" is used for ambient light, but the ambient light cannot be used. The reflection comes; the device consumes power because there is no reflection and it needs to be continuously lit. This is: m: Yes, and because of the transmissive display, it is a combination of the above-mentioned "reflection, transflective, transflective, and transflective." ". This-"Semi-reverse to save electricity, and in the dark light" can be turned off for bright display, and this "half = side first" is turned on to operate under the illumination, when used i soil + penetrating The display "in the solar penetrating display" can combine the advantages of the "reflective% ^ + liquid crystal display". & type liquid-significantly unfavorable "and" transmissive type: 1 is: "Semi-reflective semi-transmissive liquid crystal display" cross-section results! No. As shown! As shown, the conventional "semi-reflective and transflective display" light module includes an "edge light source" / ΤΓ: Hght gUide plate 20, and a liquid crystal display panel (LCD panel). 3〇. Among them, the light guide plate 20 further includes a diffuser 22 and a bright enhancement f 1 lm 24 provided thereon. The diffusion sheet 22 is used to diffuse the light from the "side light source" 10 on the side of the light guide plate 20 to uniformize the surface illuminance (11 luminance) on the liquid crystal display panel 30. The light enhancement sheet 24 is used for In order to increase the brightness per unit area on the front surface of the liquid crystal display panel 30. The disadvantage of this type of product is the poor reflection intensity of its backlight module, and

Page 5 of 573205 V. Description of the invention (3) 'The method of using side light and light guide will cause uneven brightness. Therefore, it is necessary to add a diffusion sheet 22 and a light enhancement sheet 24 to the light guide plate. This reduces the reflection efficiency of the backlight module. One of the current ways to increase the reflection intensity is to put an aluminum film on the side keys below the LCD panel, but this method will cause the "backlight" at the bottom 1 2 to reduce its luminous intensity when it penetrates the aluminum film 26 That is, if the reflected light is enhanced, the transmitted light is weakened. There is a pros and cons, and it is not the best of both worlds. Summary of invention

In view of the disadvantages of the above conventional technologies, the present invention provides a cold cathode flat fluorescent lamp (CCFFL, Cold Cathode Flat Fluorescent)

Lamp) as a semi-transmissive and semi-reflective backlight module, the surface of the lamp body is smooth, and the reflectivity is high, while the lamp body itself can be energized to emit light, and its degree is even and uniform. source) 'and do not need to add a light-enhancing sheet and / or a diffusion sheet to achieve the purpose of reducing costs. The detailed descriptions of the above and embodiments of the present invention will become more apparent from the following preferred objects, advantages and features.

The level of the gg surface is detailed: 2- Ϊ The present invention "" semi-reflective and semi-transmissive liquid crystal display "," "reverse :: f". As shown in Figure 2, the present invention is used in the "cold stage" of liquid crystal displays "Transmissive backlight module" includes a liquid crystal display panel 50. Cold cathode flat fluorescent lamp "60. Among them, the "cold cathode flat fluorescent

Page 6 573205

The surface of the lamp "50" is smooth, and the reflectivity: it can be turned on by electricity, and its brightness is high and all η 1 transmissive display devices are used under any lighting conditions. 'When the brightness of ambient light 64 is sufficient, The "two" lamp 60 can be turned off to save electricity, and the "Phosphorus thousand-face fluorescent cathode plane fluorescent lamp" 60 is turned on to provide the "cold" semi-reflective transflective display. " ㈣ 光]:; =: will not be washed away, so this "semi-reflective and semi-penetrated place is amblent light soured, and no additional selection and / or diffuser is needed to achieve power saving And the purpose of reducing costs. A. First, if this "semi-reflective and semi-transmissive display * \ is sufficient environment and it is necessary to enhance its reflection intensity, two: :: degree foot panel 50 and wide cold cathode flat fluorescent lamp ”6 〇 bis attacking the metal film (metal 1 ic fi lm) that is not material day by day is thick and thick, so that the Ming or Luo (", a ⑽) can also be used in its backlight mode f 丄 ，， 埃-増Light plate or-., And, plus-diffuser plate and mentioned in the detailed description of the preferred embodiment for the sake of limitation The specific embodiment that just came out is only easy to explain the technical content of the present invention, but You Fei accepts 1. J m 叩 Yafei narrowly conceals the present invention in this embodiment, and in accordance with the spirit of the present invention and * my place π Apply for a patent for a long time

The implementation of various changes made by the situation are all within the scope of the present invention.

573205 Brief description of the drawings Figure 1 is a schematic view of the cross-sectional structure of the conventional "semi-reflective and transflective liquid crystal display". FIG. 2 is a schematic diagram of a cross-sectional structure of the “semi-reflective and transflective liquid crystal display” of the present invention. DESCRIPTION OF SYMBOLS 10 Light source 12 Backlight 14 Ambient light 20 Light guide plate 22 Diffusion sheet 24 Enhancement sheet 26 Metal film 30 Liquid crystal panel 50 Liquid crystal panel 60 Cold cathode flat fluorescent lamp 62 Backlight 64 Ambient light

Claims (1)

573205 VI. Shenli Fan Jueyi 1. 1. A transflective-type backlight module for a liquid crystal display (LCD) includes: a liquid crystal display panel (LCD panel ); And a cold cathode flat fluorescent lamp (CCFFL, Cold Cathode Flat Fluorescent Lamp), installed on the back of the liquid crystal display panel. 2 · The transflective and semi-reflective backlight module for a liquid crystal display as described in item 1 of the scope of patent application, wherein a metal film is sandwiched between the liquid crystal display panel and the cold-cathode flat fluorescent lamp, Its thickness is 10 to 1000 Angstroms (A °, Angstrom). 3. The transflective and semi-reflective backlight module for a liquid crystal display as described in item 2 of the scope of the patent application, wherein the metal film sandwiched between the liquid crystal display panel and the cold-cathode flat fluorescent lamp is aluminum metal . 4. The transflective and semi-reflective backlight module for a liquid crystal display as described in item 2 of the scope of patent application, wherein the metal film sandwiched between the liquid crystal display panel and the cold-cathode flat fluorescent lamp is chrome metal . 5. The transflective and semi-reflective backlight module for liquid crystal display as described in item 1 of the scope of patent application, further comprising a diffuser. 6 · The transflective and semi-reflective backlight module for liquid crystal displays as described in item 1 of the scope of the patent application, which further includes a brightness enhancement plate (3 讦, Brightness Enhancement Film). The semi-transparent and semi-reflective backlight module used for the liquid crystal display further includes a diffusion plate and a light enhancement plate.