TW200831997A - Dual panel liquid crystal display and notebook - Google Patents

Abstract

The present invention relates to a dual panel liquid crystal display and a notebook using the same. The dual panel liquid crystal display includes a light guide plate, a plurality of illuminators, a first display panel, a second display panel and a display driving circuit. The light guide plate includes a light incident surface, a first light emission surface and a second light emission surface adjacent the light incident surface. The plurality of the illuminators is adjacent the light incident surface. The first display panel is adjacent the first emission surface, and the second display panel is adjacent the second emission surface. When the first display panel displays, the display driving circuit provides power to parts of the illuminators. When the second display panel displays, the display driving circuit provides power to all the illuminators.

Description

200831997 IX. Description of the invention: [Technical field to which the invention pertains] This is a notebook computer with a dual-screen liquid crystal display device and a notebook computer using the dual-screen liquid day display device. [Prior Art] Because the liquid crystal display device has the advantages of lightness, thinness, and shortness, it is widely used in modern equipment such as brain and mobile phones. However: crystal: no device only has a single liquid crystal display, using traditional liquid crystal display, after the closure of the information computer, mobile phone and other information equipment, the user knows the needs such as system time, standby time, etc. message. &, there is a kind of dual-screen liquid crystal display device on the market, which is mainly applied to information devices such as notebook computers and mobile phones. After the device is closed, the user can still dream of the display screen by double=liquid crystal display device. Related information. 1 is a side view of a prior art dual-screen liquid crystal display device. The dual-screen liquid crystal display device 10 includes a display driving circuit (the sub-display panel 11 is not stacked in a top-down manner from the top to the bottom). The module 12 and the main module are a light module 13 and a main display panel 14. The area of the sub-display panel 11 is smaller than the area of the main display panel 14. The sub-backlight group 12 provides a plane for the sub-display panel n. The main backlight module is configured to provide planar light to the main display panel 14. The display driving circuit is configured to drive the dual-screen liquid crystal display device 10. =, because the dual-screen liquid crystal display device 10 has a pair of backlight modules 12 and the main moonlight module 13, so its volume and weight are large, can not be full of its thin and light requirements. Every 200831997 to solve the above-mentioned dual-screen liquid crystal display device ίο large size and weight, the industry usually adopts _ A dual-screen liquid display device having a single backlight module. As shown in FIG. 2, it is a side view of another prior art dual-screen liquid crystal display device. The dual-screen liquid crystal display device 2 includes a display driving circuit (not shown) And a sub-display panel Η, a backlight module 22, and a main display panel 24 are sequentially stacked from top to bottom. The area of the sub-display panel 21 is smaller than the area of the main display panel 24. The backlight module 22 a side-lit backlight unit that provides planar light to the sub-display panel 21 and the main display panel %, and includes a light guide plate 223 and a plurality of light-emitting diodes (Ught)

Emitting Diode (LED) 221, the plurality of LEDs 221 are disposed on one side of the light guide plate 223. The display driving circuit comprises a main display panel driving circuit (not shown), a sub display panel driving circuit (not shown) and a backlight module driving circuit (not shown). The backlight module driving circuit drives the backlight module 22. The main display panel drive circuit and the sub display panel drive circuit blade drive the main display panel 24 and the sub display panel 21. When the main display panel 24 is to be displayed, the backlight of the display driving circuit, the dynamic circuit illuminates all the LEDs 221 of the backlight module 22, and the main display panel driving circuit provides the main display panel 24 The data signal causes the main display panel 21 to display an image, and the sub display panel 21 is now in a closed state. When the sub-display panel 21 is to be displayed, the backlight driving circuit of the display driving circuit also illuminates all of the light-emitting body 221 of the backlight module 22, and the sub-display panel driving circuit provides the sub-display panel 21 with the data signal. The sub display panel 21 is caused to display an image, and the main 200831997 display panel 24 is now in a closed state. However, when the sub display panel 2 of the dual-screen liquid crystal display device 20 displays an image, the backlight module 22 still needs to illuminate all of the light-emitting diodes 221, resulting in a large waste of electric energy. At the same time, the notebook computer using the dual-screen liquid crystal display pen 20 has a large energy consumption. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a relatively power-saving dual-screen liquid crystal display device. In addition, it is also necessary to provide a more power-saving notebook computer. A dual-screen liquid crystal display device includes a light guide plate, a plurality of light sources, a first display panel, a second display panel, and a display driving circuit. The light panel includes a human light surface and a second plurality of light sources adjacent to the human light surface adjacent to the human light surface. The first-display panel is adjacent to the (four) light-emitting surface. The second display panel is adjacent to the second light emitting surface. ^, when the panel needs to be displayed, the display driver circuit controls the part-display panel to provide light. When the first--the original non-slip circuit controls all the light sources to be the second display panel--the dual-screen liquid crystal display device comprises a light guide plate, a first-light source, a -first display panel, and a second first Source, drive circuit. The light guide plate comprises m, a panel and a first light-emitting surface showing the front surface, - the first-in-the-first-in-the-first surface, and - adjacent to the second entrance surface. The first light source is adjacent to the second light incident surface adjacent to the first input light surface. First first. The second light source-display panel is adjacent to the second light exiting surface. When - twilight surface. When the display panel needs to display 9 200831997, the display driving circuit controls the first light source to provide light to the first display panel, and when the second display panel needs to be displayed, the display driving circuit controls the second light source to The second display panel provides light. A notebook computer includes a main unit, a dual screen liquid crystal display device and a rotating shaft. The rotating shaft pivotally connects the host and the dual-screen liquid crystal display panel. The dual-screen liquid crystal display device comprises a light guide plate, a plurality of light sources, a first display panel, a second display panel and a display driving circuit. The light guide plate includes a light incident surface and a first light exiting surface and a second light emitting surface adjacent to the human light surface. The complex light source is adjacent to the light incident surface. The first display panel is adjacent to the first light emitting surface, and the second display panel is adjacent to the second light emitting surface. The display driving circuit controls a portion of the light source to provide light to the first display panel when the first display panel is to be displayed. When the second display panel is to be displayed, the display driving circuit controls all of the light sources to provide light to the second display panel. - A notebook computer includes a main unit, a dual-screen LCD display and a rotating shaft. _ Yang pivots the host and the dual-screen LCD panel. The liquid crystal display device includes a light guide plate, a first light source, a second light: a first display panel, a second display panel and a display driving circuit: the light guide plate includes a first light incident surface and a adjacent light The first surface of the first light incident surface: a smooth surface, a second light incident surface, and a second surface adjacent to the second light incident surface. The first light source is adjacent to the first light incident surface. The second source is adjacent to the second light surface. The first display panel is adjacent to the first light exiting surface. The plate is adjacent to the second illuminating surface. When the first display panel needs to be displayed, the driving circuit controls the first light source to be the first display panel. When the second display panel needs to be displayed, the display driving circuit controls the second: 200831997 source is the second display The panel provides light.

The first display panel display of the dual-screen liquid crystal display device and the second display panel are displayed from time to time, and only the corresponding light source is required to be lit, and the other light source is not lit, so the dual-screen liquid crystal display device Save energy. Meanwhile, the notebook computer using the dual-screen liquid crystal display device can also be used. [Embodiment] FIG. 3 is a perspective view of a notebook computer using the first embodiment of the dual-screen liquid crystal display device of the present invention. The notebook computer has three packs of two, a dual screen liquid crystal display device 30, a main unit 31, a rotating shaft 32 and a Hall switch 33. The mainframe 31 and the dual-screen liquid crystal display device 3 are pivotally connected by the rotating shaft 32. The dual-screen liquid crystal display device 3 is rotatable about the rotating shaft 32 within a range of 〜18°. The Hall switch 33 is disposed on the side of the dual-screen liquid crystal display device 30 near the rotating shaft 32. It follows the Hall effect, and generates electric energy according to the direction and magnitude of the change between the angle between the dual-screen liquid crystal display device 30 and the host 31. And output the corresponding signal. (Please refer to FIG. 4, which is a perspective exploded view of the dual-screen liquid crystal display device 3 shown in FIG. 3. The dual-screen liquid crystal display device 3 includes a display driving circuit (not shown) and is stacked in this order from top to bottom. a display panel 31, a moonlight module 320, and a main display panel 330. The area of the sub-display panel 31 is smaller than the area of the main display panel 330. The backlight module 32 is the sub-display panel 310 and The main display panel 33 〇 provides planar light. The display driving circuit drives the dual-screen liquid crystal display device 3. The backlight module 320 is a side-in-the-hole backlight module, which includes a plurality of light-emitting diodes 321 and The sub-optical film group 11 200831997 325, a reflective sheet 323, a light guide plate 322, and a main optical film group 324 are disposed in this order. The light guide plate 322 includes a light incident surface 326 adjacent to the light incident surface. The sub-light-emitting surface 328 of the pair 326 and the main light-emitting surface 327 opposite to the sub-light-emitting surface 328. The plurality of light-emitting diodes 321 are adjacent to the light-incident surface 326 of the light-guide plate 322, and a part of the light-emitting diodes 321 correspond to the pair of light-emitting diodes 321 Display panel 31〇, the portion of the light The diode 321 can provide sufficient light for the sub-display panel 31A, which is generally corresponding to the vertical display of the sub-display panel 310 on the sub-light-emitting surface 328. The sub-optical film group 325 is disposed on the light guide plate 322. The sub-lighting surface 328 is interposed between the sub-display panel 310. The reflective sheet 323 includes a pair of openings 329 corresponding to the sub-optical film group 325, and the area of the opening 329 and the sub-optical film group 325 and the sub-display The main optical film group 324 is disposed between the main light-emitting surface 327 of the light guide plate 322 and the main display panel 330, and has an area substantially equal to that of the main display panel 33. Referring to FIG. 3 is a structural block diagram of a display driving circuit of the dual-screen liquid crystal display device 3. The display driving circuit includes a main system I 343, a switching circuit 344, a first driving circuit 345, and a second driving 'circuit 346. An external power source (not shown) supplies power to the main system 343, and the main system 343 converts the voltage provided by the external power source into a voltage required by the first driving circuit 345 and the second driving circuit 346, and First driving circuit 345 and The second driving circuit 346 provides a data signal. The switching circuit 344 includes a first path 3441 and a second path 3442, which are controlled by the output signal of the Hall switch 33 to select a conduction path. When the first path 3411 is turned on. 'The main system 343 supplies power to the first driving circuit 345 and turns off the second driving circuit 346; when the second circuit 3412 is turned on, 12 200831997 the main system 343 supplies power to the second driving circuit 346 and turns off the The first driving circuit 345 is connected to all the LEDs 321 of the backlight module and the group 32, and the second driving circuit 346 is connected to the partial LEDs 321 corresponding to the panel 310. When the angle between the dual-screen liquid crystal display device 3 of the notebook computer 3 and the host computer 31 changes in a certain direction and is greater than a certain preset angle, if the angle between the two becomes larger, the degree is at a degree of 15 degrees. During the interval, the Hall switch is turned according to the direction of the angle change. The control signal controls the first path 3441 of the switch circuit 344 to be turned on, and the main system 343 is the first drive circuit 345 via the first path 3441. The first driving circuit 345 sends a feedback signal to the main system 343. The main system stops the data signal for the main display panel %〇 according to the internal driving circuit 345. The second drive circuit 346 provides a data signal. At the same time, the first driving circuit 345 supplies power to all of the LEDs 321 of the backlight module 32, and illuminates all of the LEDs 321 . The light emitted by the LED 321 is optically transmitted through the light guide plate 322, the reflective sheet 323 and the main optical film group 324 to provide uniform planar light to the main display panel 33A, so that the main display panel 33〇 is normally displayed. At this time, since the sub display panel 310 has no data signal and power supply, it is in a closed state. When the angle between the dual-screen liquid crystal display device 3 of the notebook computer 3 and the host 31 changes in a certain direction by less than a predetermined angle, if the angle between the two is less than 30 degrees, the Hall switch 33 changes according to the angle. Directionally outputting another control signal to turn on the second path 3442 of the switch circuit 344, then 13 200831997, the main system 343 supplies power to the second drive circuit 346 via the second path 3442, and the second drive circuit 346 issues another The main signal 343 is sent to the main system 343. The main system 343 controls the sub display panel 31 to provide a data signal to the main display panel 330 via the first driving circuit 346. At the same time, the second driving circuit 346 supplies power to the partial light-emitting diodes 321 corresponding to the sub-display panel 31A, so that the partial light-emitting diodes 321 emit light. The light emitted from the portion of the light-emitting diode 321 passes through the optical plate L of the light guide plate 322 and the second optical film group 325 to cause the sub-display panel 310 to be normally displayed. The main display panel 33 is in a closed state because there is no data signal and power supply. Compared with the prior art, the dual-screen liquid crystal display device 3 controls some or all of the LEDs 32i according to the display requirements of the main display panel 33 and the sub-display panel 310 by the signal of the Hall switch 33. It should be lit, not always bright, to save power when it meets the display requirements, and to extend the working life of some of the LEDs 321 . Please refer to FIG. 6 , which is a perspective exploded view of a second embodiment of the dual-screen liquid crystal display device of the present invention. The dual-screen liquid crystal display device includes a display panel 410, a backlight module 420, and a main display panel 430. The dual-screen liquid crystal display device 4 is substantially the same as the state of the dual-screen liquid crystal display device. The difference is that the backlight module 420 includes a main lamp tube 412, a sub-light tube 413, and a stack of layers from top to bottom. A pair of optical groups 425, a reflective sheet 423, a light guide plate 422 and a main optical film group 424. The light guide plate 422 includes a main light incident surface 402, a main light exit surface 427 adjacent to the main light incident surface 402, a sub-light incident light 14 relative to the main light incident surface 4〇2, 200831997, a surface 403, and a adjacent The light surface 403 is opposite to the sub-light-emitting surface 428 of the main light-emitting surface 427. The main lamp 412 is a Cold Cathode Fluorescent Lamp (CCFL) adjacent to the main entrance face 4〇2 to provide light to the main display panel 430. The sub-lamp 413 is also a cold cathode fluorescent lamp adjacent to the sub-light incident surface 403 for providing light to the sub-display panel 41. The power of the sub-lamp 413 is less than the power of the main lamp 412, and the length of the sub-tube 413 is smaller than the length of the main lamp 412, which is generally perpendicular to the sub-display panel 410 on the sub-light-emitting surface 428. The length is equal. Narration? The screen liquid crystal display device 3〇 and the dual-screen liquid crystal display device are not used in the display device of the pen-type computer, and can also be used in modern information devices such as mobile phones and personal digital assistants. Li Shen said, the invention meets the requirements of the invention patent, and is specifically familiar with the law: the case technology ST is only a preferred embodiment of the present invention, and the equivalent of the invention in the spirit of the creation of the case : All should be included in the scope of the following patent application. [Simple Description of the Drawing] Compared with the prior art, the display driving circuit (not shown) of the dual-screen liquid crystal display device 4 receives the signal of the Hall switch, and according to the main display panel 410 and the wj display panel 430 The display requirement 'controls the main lamp 412 or the sub-lamp 413 to respectively illuminate, thereby achieving the purpose of power saving. ° ::: A side view of a prior art dual screen liquid crystal display device. A side view of a prior art dual screen liquid crystal display. Fig. 3 is a perspective view showing a first type of computer using the dual screen liquid crystal display (four) of the present invention. Fig. 4 is a perspective exploded view of the dual-screen liquid crystal display device shown in Fig. 3. Fig. 5 is a block diagram showing the structure of a display driving circuit of the dual-screen liquid crystal display device shown in Fig. 3. Fig. 6 is a perspective exploded view showing a second embodiment of the dual screen liquid crystal display device of the present invention. [Main component symbol description] Notebook computer 3 dual-screen liquid crystal display device 30, 40 host 31 rotating shaft 32 Hall switch 33 sub-display panel 310, 410 backlight module 320, 420 main display panel 330, 430 LED Body 321 light guide plate 322, 422 reflective sheet 323 > 423 main optical film set 324, 424 sub optical film set 325, 425 light incident surface 326 main light exit surface 327, 427 sub light exit surface 328, 428 opening 329 > 429 Main system 343 switch circuit 344 first path 3441 second path 3442 first drive circuit 345 second drive circuit 346 main lamp 412 sub lamp 413 main entrance surface 402 sub-light entrance surface 403 16

Claims (1)

2UU«J1997 X. Patent application scope 1. A dual-screen liquid crystal display device, - a light guide plate, comprising: 4: a light incident surface; and = a light source of the light incident surface adjacent to the light incident surface The first display panel adjacent to the first 二 二 鄱沂 Μ ;; Γ 郯 郯 该 该 该 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一Although the first light source of the first display panel is the first 韶-., 'the display drive circuit control board needs to be displayed when the display is _'·', and the panel does not provide light; when the second display surface panel is provided The optical driving circuit controls all the light sources to be the dual-screen liquid crystal display device according to the second aspect of the second display range. (4) The area of the display panel is smaller than the surface of the second display panel. The dual-screen liquid crystal display device of claim 2, wherein the scratching light source is perpendicular to the first display panel on the first light-emitting surface. 4. The dual-screen liquid crystal display device according to claim 1, wherein The display driving circuit includes a main system, which is the pair The liquid crystal display device provides a data signal and a working voltage. The dual-screen liquid crystal display device of claim 4, wherein the display driving circuit further comprises a switching circuit for controlling the output of the main system of the 200831997 The flow direction of the voltage includes a first-pass two-channel. The sixth embodiment of the dual-screen liquid crystal display device as described in the patent application 帛5帛, the display drive circuit further includes a first defeat. The first path is connected to the main system. /, according to the double-screen liquid crystal display device of claim 6, wherein the display driving circuit further comprises a second driving circuit, The second path is connected to the main system. /,,, 2, 8. The dual-screen liquid crystal display device according to claim 7, wherein the step comprises a Hall switch, which outputs a second signal. The double (four) crystal display described in the eighth item: 'The second signal outputted by the Hall switch respectively turns on the second pass through the second pass. Side 1〇_: The dual-screen liquid crystal display device described in the scope of claim i, Its progress The step includes: a reverse-screen between the sub-display panel and the light guide plate. The double-screen liquid crystal display device as described in claim 10, wherein the reflective sheet has an opening relative to the position of the sub-display panel A: The dual-screen liquid crystal display device of claim 5, wherein the area of the opening is equal to the area of the sub-display panel. The dual-screen liquid crystal display device according to claim 12, The advancement includes a pair of first optical film groups that should be opened. (A double-screen liquid crystal display device as described in claim 1G, wherein the v includes a second light between the light guide plate and the main display panel 18 200831997 Learned film group. The dual-screen liquid crystal display device of claim 1, wherein the plurality of light sources are a plurality of light-emitting diodes. A dual-screen liquid crystal display device, comprising: a light guide plate, comprising: a first light incident surface; a first light emitting surface adjacent to the first light incident surface; a second light incident surface; a second light emitting surface adjacent to the second light incident surface; a first light source adjacent to the first light incident surface; a second light source adjacent to the second light incident surface; and a first display panel adjacent to the first light emitting surface a second display panel adjacent to the second illuminating surface; and a display driving circuit; 誃 誃 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 The second display two display surface lacking driving circuit controls the second light source to be the first ‘The display panel provides light. Its 17: The double-screen liquid 18 as described in claim 16 of the patent scope is a cold cathode fluorescent lamp. Days and nights, no installation,: Special::::7 w 19. Such as Shen surname " / was originally a cold cathode fluorescent lamp. The power of the dual-screen liquid crystal display device of item 18 is less than the power of the second light source. 19 200831997 Please refer to (4) the double-screen LCD device of the 16th item, where the area of the 2'th first display panel is smaller than the area of the first: display panel. 21. The dual screen liquid crystal display device of claim 2, wherein the first display panel corresponds to a vertical projection of the first output channel. In the dual-screen liquid crystal display device of claim 16, wherein the r:= dynamic circuit comprises a main system for driving the daytime display device. Hf (4) The dual-screen liquid crystal display device of item 22, wherein the main system wheel is completed, and the switch circuit is controlled to control the two paths. In the 23rd section of the patent application scope, the + + + t & & 又 又 又 又 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , (4) The m-moving circuit, which is in the double-screen liquid according to the scope item 24, wherein the driving circuit further comprises a first: a: the second system is connected to the main system. #其绖进—Shenwei's dual-screen LCD display is placed, and its 27 & by the —-Hall switch, it outputs two signals. 7. As stated in item 26 of the scope of application for patents, the day after day, the thunder is not installed, and the second signal of the μ 隹 switch is the second channel. The brother-in-law and the 20 200831997 28 second application: the dual-screen LCD display film described in item 16 of the second interest range. Tian 〗 々 々 扳 扳 及 及 及 及 该 · · · · · · · · · · · · · · · · · · · · · · · · · · 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如30. As in the eighth paragraph of the patent application, in the double-screen liquid crystal display device described in Item 29, the area of the cardiac opening is equal to the area of the sub-display panel. The f-step includes: The dual-screen liquid crystal display device described above, the first optical film group of the 3 2... Kui opening. The dual-screen liquid crystal display device of the above-mentioned item 31, wherein: the second 33.-type notebook computer between the light guide plate and the main display panel comprises: a host; a dual-screen liquid crystal display The device includes: a light guide plate, comprising: a light incident surface; and a first light exiting surface and a second light emitting surface; a light source adjacent to the light incident surface; and a first light emitting surface adjacent to the light emitting surface a display panel; a second display panel adjacent to the second light-emitting surface; and a display driving circuit; and a rotating shaft 'which pivots the host and the dual-screen liquid crystal · wherein, when the first display, ^ again, In some cases, the display driving circuit control 21 200831997 provides a part of the light source to provide light to the first display panel; when the second display panel needs to be displayed, the display driving circuit controls all the light sources to provide light to the second display panel. . A notebook computer according to claim 33, wherein the area of the first display panel is smaller than the area of the second display panel. The notebook computer of claim 34, wherein the scratch light source corresponds to a vertical projection of the first display panel on the first light exiting surface. The notebook computer of claim 33, wherein the driver circuit comprises a main system for supplying the data signal and the operating voltage to the dual-screen liquid crystal display device k. 37. The notebook computer of claim 36, wherein the display drive circuit further comprises a switch circuit that controls the flow of the operating voltage of the main system, including a first path and a first The notebook computer of claim 37, wherein the driver circuit further comprises a first driving circuit connected to the main system via the first path. 39. The notebook computer of claim 38, wherein the *, , and page driving circuit further comprises a second driving circuit connected to the main system via the second path. The notebook computer of claim 39, further comprising a Hall switch for outputting a second signal. The notebook computer of claim 4, wherein the 22 2 00831997 When the angle between the dual-screen liquid crystal display device and the host is 1 to 15 degrees, the Hall switch outputs a signal to turn on the second path. 42. The note as described in claim 39 a type of computer, wherein, when the angle between the dual-screen liquid crystal display device and the host is less than 3 degrees, the Hall switch outputs a signal to turn on the first path. 43. The notebook type according to claim 33 The computer further includes a reflective sheet between the sub-display panel and the light guide plate. The notebook computer of claim 43, wherein the position of the reflective sheet relative to the sub-display panel 45. The notebook computer of claim 44, wherein the area of the opening is equal to the area of the sub-display panel. 46. The notebook computer of claim 45 And further comprising a pair of first optical film groups that should be opened. The notebook computer of claim 46, further comprising a light guide plate and the main display panel The notebook computer of claim 33, wherein the digital light source is a plurality of light emitting diodes. 49. A notebook computer comprising: a dual-screen liquid crystal display device, comprising: a light guide plate, comprising: a first light-emitting surface of the light-incident surface; a first light-incident surface adjacent to the first 23 200831997 - a second light-incident surface; a second light emitting surface of the second light incident surface; a first light source adjacent to the first light incident surface; a second light source adjacent to the second light incident surface; and a first display panel adjacent to the first light exiting surface a second display panel of the second light-emitting surface and a mi-display driving circuit; and a t-axis of the dual-screen liquid crystal display device and the main machine; the panel is not required to be displayed The display driving circuit controls the light source of the child to provide light to the panel, and when the second display: ", the display driver circuit controls the second light source to provide light to a display panel. . 5〇.=—Applicable to the notebook computer described in item 49 of the patent scope—the light source is a cold cathode fluorescent lamp. 51: If the scope of patent application is 5th. The notebook computer described in the item is a cold cathode fluorescent lamp. The power of a light source of the notebook computer according to claim 51 of the patent scope is smaller than the power of the second light source. 53.=Please note that the notebook computer described in item 49 of the patent scope has an area of (10) that is not smaller than the area of the second display panel. For example, in the notebook computer of claim 53, wherein the vertical projection of the display panel on the first-light-emitting surface corresponds to the first 55. The notebook computer as described in claim 49 Wherein, wherein, wherein, the 24 200831997. The display driving circuit comprises a main system for driving the dual-screen liquid crystal display device. The notebook computer of claim 55, wherein the display driving circuit further comprises a switching circuit that controls a flow direction of the output voltage of the main system, and includes a first path and a second path . 57. The notebook computer of claim 49, wherein the f further comprises a Hall switch' which outputs a second signal. 8. The notebook computer according to claim 57, wherein when the angle between the dual-screen liquid crystal display device and the host is 1 to 15 degrees, the Hall switch outputs a signal to turn on the signal. The second path. 9. The notebook computer of claim 58 wherein, when the angle between the dual-screen liquid crystal display device and the host is less than 3G degrees, the Hall switch outputs a signal to turn on the first path. The notebook computer of claim 49, further comprising (i) a reflective sheet between the sub-display panel and the light guide plate. The notebook computer according to claim 6G, wherein The reflective sheet has an opening with respect to the position of the sub-display panel. The notebook computer of claim 61, wherein the area of the sweat 1 is equal to the area of the sub-display panel. The notebook computer of the above-mentioned item further includes: a first optical film group corresponding to the opening. The notebook computer according to item 63 of the patent scope of February, further located on the light guide plate and the main display Second optical film 25 between panels 200831997. 26