CN100432753C

CN100432753C - Display device, driving device of display device, and driving device of light source for display device

Info

Publication number: CN100432753C
Application number: CNB2005101250005A
Authority: CN
Inventors: 金在光; 李相熙
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2004-09-02
Filing date: 2005-09-02
Publication date: 2008-11-12
Anticipated expiration: 2025-09-02
Also published as: CN1769959A; KR20060021056A

Abstract

A display device is provided. The display device includes a main display panel, a sub-display panel, and a plurality of lamps simultaneously supplying light to the first and second display panels; an openness sensing unit in which an output signal is defined based on a degree of openness of the display device; and a lamp controlling unit selecting one of the display panels based on the output signal from the openness sensing unit and defining the number of lamps to be turned on based on the selected display panel, and supplying the light to the main and sub-display panels by lighting the defined number of lamps. In one embodiment, the display device is a display device for a mobile phone, and the lamps are light emitting diodes. Accordingly, the number of lamps to be turned on is varied based on the selected display panel, and consumption power therefore decreases.

Description

Display device, display device drive unit and display device light source drive device

Technical field

The drive unit that the present invention relates to the drive unit of display device, display device and be used for the light source of this display device.

Background technology

Plasma display panel (PDP) is to utilize the Plasma Display character of gas discharge generation or the device of image, and organic light emitting display (OLED) is the device that utilizes electroluminescence character display or image.LCD (LCD) is by being applied to electric field the liquid crystal layer between the two panels, and adjusts electric field intensity and show and expect the device of image to regulate the optical transmission rate that sees through liquid crystal layer.

Have the display device that is separately positioned on inside and outside display panel and is mainly used in mobile phone, be referred to as " dual display " hereinafter, just developing into medium-sized/small-sized display device.

Dual display comprises the main display panel that is arranged on inside; Be arranged on outside inferior display device; Be used for being equipped with the printed circuit board (PCB) (PCB) of a plurality of circuit components from the external device (ED) received signal, thereon; Have a plurality of signal wires that are used for transmission signals, be connected to PCB and will be applied to flexible print circuit (FPC) plate of main display panel from the signal of inferior display panel; And the integrated chip of controlling them.

Integrated chip produces drive signal and the control signal be used for controlling main display panel and time display panel, and mainly is installed on the main display panel in COG (chip on glass) structure.

Owing to use the product of dual display normally portable, so product is by being charged to the compact power supply line voltage of predetermined voltage.By different function and services is provided thereon, the data volume that needs to handle has increased, and power consumption has increased, so reduce the service time of charging voltage gradually.Yet,, be difficult to so increase the capacity of power supply along with product minimizes all needing aspect the volume and weight.

Summary of the invention

The light source drive device that is used for display device is provided, this light source comprises a plurality of lamps that are connected in parallel to each other, and each light fixture has the first terminal and second terminal, this light source comprises: the state detection unit of lamp, its detection is applied to the driving voltage of each lamp, and detected driving voltage and reference voltage compared, and the lamp state detection signal that has the overcurrent condition announcement information at least one lamp output; And transducer, this transducer turns on and off lamp by applying AC voltage, and based on lamp state detection signal control AC voltage, wherein reference value changes, and it depends on the amplitude of the driving voltage that is applied to each lamp.

Display device is provided, and it comprises: at least two display panels; A plurality of lamps of light being passed to display panel; And the lamp control module, this lamp control module is used for selecting signal to select the lamp of predetermined quantity based on the panel that the outside applies, and selects one of them display panel, by lighting selected lamp, light is offered display panel.

Display panel can comprise first display panel and second display panel, and first display panel is bigger than second display panel.

The lamp of selecting is towards the edge of second display panel.

When the display panel of selecting was second display panel, the quantity of the lamp of selection can be lacked than the quantity of the lamp of selecting when the display panel of selecting is first display panel.

Display device can be a liquid crystal indicator.

Lamp can be light emitting diode (LED).

Display device is provided, and comprising first printed circuit board (PCB) (PCB), this printed circuit board (PCB) comprises a plurality of lamps, be connected to first lead of lamp, is connected to a plurality of other leads of lamp; Flexible print circuit (FPC) plate, it comprises first signal wire that is connected respectively to first lead, is connected to a plurality of signal wires of second lead; The 2nd PCB, a plurality of privates that it comprises the privates that is connected to first signal wire and is connected to the secondary signal line; First voltage is applied to privates, second voltage is applied to privates, and the lamp control module of selecting signal controlling second voltage to apply based on exterior panel; And first and second display panels that light is provided by lamp simultaneously, wherein the lamp control module is installed on the 2nd PCB, and lamp offers first and second display panels by lighting based on differing between first voltage and second voltage with light.

First voltage can be bigger than second voltage.

Lamp can be light emitting diode (LED).

First voltage can be transferred to the terminal of each LED publicly, second voltage is transferred to other terminals of LED respectively, the lamp control module can be controlled second voltage application, and this second voltage is applied to each other terminals of selecting the LED of signal based on panel.

The method that drives display device is provided, and it comprises: read exterior panel and select signal; Select signal to select a display panel based on panel; Select the lamp of predetermined quantity based on Selection Floater; And, light is offered display panel by lighting the lamp of selection.This display device comprises at least two display panels and a plurality of lamp of light transmission being given display panel.

Provide and comprised first display panel, second display panel and a plurality of display device that simultaneously light is offered the lamp of first and second display panels, this display device comprises: the opening degree detecting unit, and wherein the opening degree degree based on display device limits output signal; The lamp control module, it is based on the display panel of output signal selection from the opening degree detecting unit, limits the quantity of the lamp of conducting based on the display panel of selecting, and by lighting the lamp that limits quantity light is offered first and second display panels.

First display panel can be bigger than second panel, and when the display panel of selecting was second display panel, the quantity of the lamp of selection can be lacked than the quantity of the lamp of selecting when the display panel of selecting is first display panel.

Display device can be the display device that is used for mobile phone.

Lamp can be a light emitting diode.

Display device is provided, and it comprises: at least two display panels; A plurality of lamps that light offered display panel; And the lamp control module, the panel that this lamp control module applies based on the outside selects signal change to be applied to the signal of lamp, and selects one of them display panel to adjust from the light intensity of lamp and with light to offer display panel.

The lamp control module can be selected the lamp of predetermined quantity, and the signal amplitude that imposes on the remaining lamp except that the lamp of selecting by adjustment changes light intensity.

The lamp control module can be selected the lamp of predetermined quantity, by lighting selected lamp, adjusts the light intensity from lamp.

Display panel can comprise first display panel and second display panel, and wherein first display panel is bigger than second display panel.

The lamp of selecting can be towards the edge of second display panel.

Lamp can be light emitting diode (LED).

The display device that comprises at least two display panels and a plurality of lamps positioned opposite to each other with respect to display panel is provided, it comprises the lamp control module, the panel that this lamp control module applies based on the outside selects signal to select the lamp of predetermined quantity, and, light is offered at least one side of each display panel by lighting the lamp of selection.

When the display device of selecting signal to select based on panel was first display panel, the lamp control module can offer light the both sides of first display panel.

When the display device of selecting signal to select based on panel was second display panel, the lamp control module can offer light one side of second display panel.

Display panel can be the display panel that is used for liquid crystal indicator.

Lamp can be light emitting diode (LED).

Display device is provided, comprising: comprise a plurality of lamps, be connected to first lead of lamp and first printed circuit board (PCB) (PCB) of a plurality of other leads; Comprise first signal wire that is connected to first lead and flexible print circuit (FPC) plate that is connected to a plurality of signal wires of second lead; Comprise privates that is connected to first signal wire and the 2nd PCB that is connected to a plurality of privates of secondary signal line; First voltage is applied to the lamp control module that privates, second voltage are applied to privates and select signal controlling second voltage to apply based on exterior panel; And first and second display panels that light is provided by lamp, lamp control module wherein is installed on the 2nd PCB, lamp is with respect to the setting that faces with each other of a display panel of display panel, and by lighting lamp based on the difference between first voltage and second voltage, light is offered first and second display panels, and the some of them lamp only provides light to first display panel.

First voltage can be bigger than second voltage.

Lamp can be light emitting diode (LED).

First voltage can be transferred to the terminal of each LED publicly, and second voltage is transferred to other terminals of LED respectively, and the lamp control module is controlled second voltage application, and second voltage selects signal to impose on each other terminal of LED based on panel.

The method that drives display device is provided, and this method comprises: read exterior panel and select signal; Select signal to select one of them display panel based on panel; Select the lamp of predetermined quantity based on Selection Floater; And light is offered at least one side of each display panel by the lamp of lighting selection.This display device comprises at least two display panels and a plurality ofly comprises at least two display panels and a plurality of positioned opposite to each other and light transmission is given the lamp of display panel with respect to display panel for the lamp of display panel, this display device light transmission.

When the display panel of selecting signal to select based on panel is first display panel, select predetermined lamp light can be offered the both sides of first display panel.

Display device is provided, this display device comprises first display panel, second display panel and a plurality of positioned opposite to each other and light is offered the lamp of first and second display panels with respect to one of them display panel, this display device comprises: the opening degree detecting unit, and wherein the opening degree degree based on display device limits output signal; Be used for based on the quantity of wanting the lamp of conducting from one of them display panel of output signal selection of opening degree detecting unit, based on selected display panel restriction, and the lamp that limits quantity by lighting, light is offered the lamp control module of at least one side of each first and second display panel.

First display panel is bigger than second display panel, and when the display panel of selecting signal to select based on panel was first display panel, the lamp control module offered light the both sides of first display panel.

Display device can be the display device that is used for mobile phone.

Lamp can be a light emitting diode.

Display device is provided, this display device comprises at least two display panels and a plurality of positioned opposite to each other and light is offered the lamp of first and second display panels with respect to one of them display panel, this display device comprises: the lamp control module, the panel that this lamp control module applies based on the outside selects signal change to be applied to the signal of lamp, and selects one of them display panel to adjust from the light intensity of lamp and light is offered at least one side of each display panel.

The lamp control module can be selected the lamp of predetermined quantity, and the signal amplitude that is applied to except that the lamp that is left of selected lamp by adjustment changes light intensity.

The lamp control module can be selected the lamp of predetermined quantity, and by lighting selected lamp, changes the light intensity from lamp.

Selected lamp can be positioned opposite to each other with respect to first display panel.

Lamp can be a light emitting diode.

Description of drawings

With reference to the accompanying drawings, by describing preferred embodiment in detail, the present invention will become apparent, wherein:

Fig. 1 is the decomposition diagram according to two LCD of the embodiment of the invention;

Fig. 2 is mounted in the block diagram of the LCD on the main display panel of the two LCD shown in Fig. 1;

Fig. 3 is the equivalent circuit diagram of the pixel of the LCD shown in Fig. 2;

Fig. 4 be according to an embodiment of the invention, explanation goes up the signal wire of formation and is used for the synoptic diagram of annexation lamp, between the signal wire that forms on flexible print circuit (FPC) plate at printed circuit board (PCB) (PCB) and the PCB that is used for lamp;

Fig. 5 is the circuit diagram according to the lamp unit of the embodiment of the invention;

Fig. 6 (A), Fig. 6 (B) are the location diagram of explanation between light emitting diode (LED), main display panel and inferior display panel;

Fig. 7 is the process flow diagram according to the lamp controller of the embodiment of the invention;

Fig. 8 is decomposition diagrams according to another embodiment of the invention, two LCD;

Fig. 9 is mounted in the block diagram of the LCD on the two LCD master's display panels shown in Fig. 8;

Figure 10 be according to another embodiment of the invention, explanation is at PCB and be used for the signal wire that forms on the PCB of lamp and be used for the synoptic diagram of annexation lamp, between the signal wire that forms on flexible print circuit (FPC) plate;

Figure 11 is the circuit diagram of lamp unit according to another embodiment of the invention;

Figure 12 (A), Figure 12 (B) be according to another embodiment of the invention, explanation is installed in the luminance of the LED on main display panel and the inferior display panel.

Embodiment

With reference to the accompanying drawings, below invention will be more fully described, and the preferred embodiments of the present invention have been shown in the accompanying drawing.

In the accompanying drawings, for clarity sake, enlarged the thickness in layer and zone.Represent components identical with identical Reference numeral in full.Be readily appreciated that, when element such as layer, film, zone, substrate or panel be positioned at another element " on " time, can directly maybe can have intermediary element above the element at another.On the contrary, when an element be expressed as " directly existing " another element " on " time, then do not have intermediary element.

Root will be described according to the display device of embodiments of the invention, the driving method of this display device and the drive unit that is used for the light source of this display device with reference to the accompanying drawings.

Referring to figs. 1 to Fig. 6, will describe liquid crystal indicator (LCD) according to an embodiment of the invention now in detail, especially for two LCD of mobile phone with main display window and time display window.

Fig. 1 is the decomposition diagram of two according to an embodiment of the invention LCD, Fig. 2 is mounted in the block diagram of the LCD on the main display panel of the two LCD shown in Fig. 1, Fig. 3 is the equivalent circuit diagram of the pixel of the LCD shown in Fig. 2, Fig. 4 is according to an embodiment of the invention, explanation is at printed circuit board (PCB) (PCB) and be used for signal wire that the PCB of lamp go up to form and be used for lamp, the synoptic diagram of the annexation between the signal wire that forms on flexible print circuit (FPC) plate, Fig. 5 is the circuit diagram according to the lamp unit of the embodiment of the invention, and Fig. 6 is that explanation is at light emitting diode (LED), location diagram between main display panel and the inferior display panel.

With reference to figure 1, two according to an embodiment of the invention LCD comprise the LC module 310 with main display panel 330a, inferior display panel 330b and back light unit 900, a pair of preceding and

rear chassis

361 and 362, model frame (mold frame) 336, a plurality of flexible print circuit (FPC) plate 350,360 and 370 that comprises this LC module 310, and printed circuit board (PCB) (PCB) 610.

Main display panel 330a comprises main LC panel assembly 300a, is installed in the integrated chip 620 of main LC panel assembly 300a and is applied to integrated chip 620 diaphragm 621 on every side.

Inferior display panel 330b comprises time LC panel assembly 300b.

Main display panel 330a is bigger than inferior display panel 330b.

Main LC panel assembly 300a and time LC panel assembly 300b comprise

lower panel

100a and 100b, upper panel 200a and 200b, and as shown in Figure 3, be separately positioned on LC layer 3 between the two.

The structure of main LC panel assembly 300a is identical with the structure of time LC panel assembly 300b, describes for convenient, will only describe main LC panel assembly 300a with reference to figure 2 and 3.

Lower panel 100a comprises a plurality of display signal line G1-Gn and D1-Dm, and bottom and

upper panel

100a and 200a comprise a plurality of pixels that are connected to display signal line G1-Gn and D1-Dm and are provided with the form of matrix basically in the circuit diagram as shown in Fig. 2 and 3.

Display signal line G1-Gn and D1-Dm comprise the gate lines G 1-Gn of a plurality of transmission signals (also being referred to as " sweep signal ") and the data line D1-Dm of a plurality of transmission of data signals.The direction that gate lines G 1-Gn follows is basically extended, and is substantially parallel each other, and data line D1-Dm extends along the direction of row basically, substantially parallel each other.

Each pixel comprises the on-off element Q that is connected to display signal line G1-Gn and D1-Dm, and the LC capacitor C that is connected to on-off element Q _LCWith holding capacitor C _STThis holding capacitor C _STCan omit in other embodiments.

Can be arranged on the lower panel 100a with the on-off element Q that TFT realizes.On-off element Q has three terminals: the control end that is connected to one of gate lines G 1-Gn; Be connected to the input end of one of data line D1-Dm; And be connected to LC capacitor C _LCWith holding capacitor C _STOutput terminal.

LC capacitor C _LCComprise as two terminals, be arranged on the pixel electrode 190 on the lower panel 100a and be arranged on public electrode 270 on the upper panel 200a.Be arranged on LC layer 3 between two

electrodes

190 and 270 as LC capacitor C _LC Dielectric.Pixel electrode 190 is connected to on-off element Q, and public electrode 270 provides common electric voltage Vcom and covers the whole surface of upper panel 200a.In other embodiments, public electrode 270 can be arranged on the lower panel 100a, and

electrode

190 and 270 can have strip or band like form.

Holding capacitor C _STBe LC capacitor C _LCAuxiliary capacitor.Holding capacitor C _ST Comprise pixel electrode 190 and signal wire independently, holding capacitor C _STBe arranged on the lower panel 100a, overlapping by insulator and pixel electrode 190, and provide predetermined voltage, as common electric voltage Vcom.Perhaps, holding capacitor C _ST Comprise pixel electrode 190 and adjacent gate lines, this adjacent gate lines is referred to as previous gate line, and it is overlapping by insulator and pixel electrode 190.

For colour shows, each pixel represents that uniquely a kind of primary colors (that is, spatial division) or each pixel represent primary colors (that is, the time divides) in order successively, and the space of primary colors or temporal summation are identified as the color of hope like this.The example of one group of primary colors comprises the red, green and blue look.The example that Fig. 3 representation space is divided, wherein each pixel comprises color filter 230, this color filter is illustrated in a primary colors in the zone of the upper panel 200a of pixel electrode 190.Perhaps, color filter 230 be arranged on the top of pixel electrode 190 on the lower panel 100a or below.

One or more polarizer (not shown) that are used for polarized light are attached to the outside surface of

panel

100a and 200a.

Gate drivers 400 is connected to gate lines G 1-Gn, synthesizes and closes voltage Voff is used to be applied to gate lines G 1-Gn with generation signal from the grid cut-in voltage Von and the grid of external device (ED).Gate drivers 400 and on-off element Q, display signal line G1-Gn directly are attached on the lower panel 100a of main LC panel assembly 300a together.

As shown in Figure 1, the lower panel 100a that integrated chip 620 is directly installed on main LC panel assembly 300a goes up (being referred to as COG (chip on glass)), promptly as shown in Figure 2, comprise signal controller 600, be connected to the data driver 500 of signal controller 600, and the grayscale voltage generator 800 that is connected to data driver 500.

Grayscale voltage generator 800 produces two groups and transmits relevant grayscale voltage with pixel.Grayscale voltage in one group has positive polarity with respect to common electric voltage Vcom, and another the group in those have negative polarity with respect to common electric voltage Vcom.

Data driver 500 comprises a plurality of IC chips that are installed on each data TCP 510.

Data driver 500 is connected to the data line D1-Dm of main LC panel assembly 300a, and will be applied to data line D1-Dm by the data voltage of selecting from grayscale voltage that grayscale voltage generator 800 provides.

Signal controller 600 is connected to back light unit 900 and

Control Driver

400 and 500, or the like.

As Fig. 1,2 and 4-6 shown in, back light unit 900 is fixed near the edge of minor axis of model frame 336, comprise to main LC panel assembly 330a and time radiative lamp of LC panel assembly 300b unit 910, be connected to the signal controller 600 of integrated chip 620 and respond to the opening degree sensor 960 of mobile phone opening degree, be connected to the lamp controller 970 of opening degree sensor 960 and lamp unit 910, the PCB 950 of lamp unit 910 is installed thereon, to be directed to main LC panel assembly 300a and time LC panel assembly 300b and the even light guide plate 341 that keeps light intensity from the light of lamp unit 910, and a plurality of light

thin slice

342a and 342b that are arranged on the following and top of light guide plate 341 and guarantee light characteristic.

Lamp unit 910 comprises a plurality of LED L1-L6.In the present embodiment, the quantity that is installed in the LED on the lamp unit 910 is six, but in other embodiments, the quantity of LED can be determined based on the operation of LCD.

As shown in Figure 6, on PCB 950, LED L1-L6 is arranged on the direction of embarking on journey along the edge of main display panel 330a, and is provided with on the direction of embarking on journey for the center left and right symmetrically at the edge of inferior display panel 330b.

Opening degree sensor 960 preferably is arranged on the coupling part (not shown) that connects between the main body of mobile phone and the two LCD, it comprise output with based on from the induction installation of the relevant voltage of the resistance of the opening degree qualification of two LCD of mobile phone main body etc.Yet the arrangement position of opening degree sensor or operation characteristic can change in other embodiments.

Based on voltage from opening degree sensor 960, lamp controller 970 control lamp unit 910, this lamp controller 970 can be combined on the PCB 610.

A plurality of FPC plates 350,360 and 370 are included in the main FPC plate 350 that connects between integrated chip 620 and the PCB 610, the inferior FPC plate 360 that connects and connect between PCB 950 and PCB 610 between main LC panel assembly 300a and inferior LC panel assembly 300b FPC plate 370.

As shown in Figure 4, a plurality of signal wires 351 and 371-377 are formed on main FPC plate 350 and the FPC 370.

Each signal wire 351 is connected to a plurality of leads 621 that are formed on the PCB 610 by contact (contact) 619.Signal wire 371-377 is connected to lead 622 on a plurality of PCB of being formed on 610 by contact 619, and is connected to a plurality of lead 951-957 that are formed on the PCB 950 by contact 959 respectively.

Signal wire 351 and 371-377 comprise the signal wire 351 that transmits voltage, control signal and the data etc. that are used to drive integrated chip 620 and are used for transmitting the signal wire 371-377 of drive signal to the corresponding LED L1-L6 of lamp unit 910.

The signal wire of a plurality of leads and transmission of control signals and data can also be formed on PCB 610, FPC plate 370 and the PCB 950, and the quantity of lead and signal wire can change according to use.

A plurality of signal wires can be formed on time FPC plate 360, come the data of autonomous LC panel assembly 300a or control signal to be transferred to time LC panel assembly by data or control signal.

Front chassis 361 and rear chassis 362 comprise

window

365 and 366 respectively, and PCP 610 also comprises window 615.

The viewing area of exposing main LC panel assembly 300a by window 365.

The light that inferior LC panel assembly 300b receives from lamp unit 910 by window 366, the viewing area of exposing time LC panel assembly 300b by window 615.

A plurality of circuit components that are connected to lead 621 and 622 are installed on the PCB 610.Except that

lead

621 and 622, a plurality of lead (not shown) of external signal that provide also are formed on the PCB 610.Front chassis 361 and rear chassis 362 respectively in the upper and lower of model frame 363 in conjunction with to finish two LCD, wherein front chassis 361 and rear chassis 362 comprise LC module 310.

Now, the operation of two LCD will be described in detail.

With reference to figure 2, provide received image signal R, G and B by the signal wire 351 of main FPC plate 350 and the lead 621 of PCB 610 to the signal controller 600 of integrated circuit 620 from the external graphics controller (not shown), with the input control signal of its display of control, wherein input control signal for example is vertical synchronizing signal Vsync, horizontal-drive signal Hsync, major clock MCLK and data enable signal DE.Also provide based on opening degree induced signal from two LCD opening degrees of the opening degree sensor 960 of back light unit 900 to signal controller 600.

According to the opening degree induced signal, after selecting among main LC panel assembly 300a and time LC panel assembly 300b, produce grid control signal CONT1 and data controlling signal CONT2, then according to input control signal and received image signal R, G and B, handle picture signal R, G and B to be suitable for selected panel assembly operation, signal controller 600 provides grid control signal CONT1 for gate drivers 400, processed images signal DAT and data controlling signal CONT2 is provided for data driver 500.

As selection, signal controller 600 can be selected one of them of main LC panel assembly 300a and time LC panel assembly 300b with separate circuit elements or additive method.

Grid control signal CONT1 comprises scan start signal STV, and this scan start signal STV is used for instructing gate drivers 400 to begin scanning, and comprises that at least one clock signal is used for controlling the output time of grid cut-in voltage Von.Grid control signal CONT1 can also comprise the output enable signal OE that is used for limiting the grid cut-in voltage Von duration.

Data controlling signal CONT2 is included as horizontal synchronization commencing signal STH, the load signal LOAD and the data clock signal HCLK that director data driver 500 is applied to data voltage data line D1-Dm of one group of pixel notification data transmission beginning.This data controlling signal CONT2 may further include and is used for the reverse signal RVS of reversal data voltage (with respect to common electric voltage Vcom) polarity.

In response to data controlling signal CONT2 from signal controller 600, data driver 500 receives a view data DAT packet for one group of pixel from signal controller 600, convert view data DAT to from the grayscale voltage that grayscale voltage generator 800 provides, select analog data voltage, and data voltage is applied to the data line D1-Dm of main LC panel assembly 300a or inferior LC panel assembly 300b.

In response to grid control signal CONT1 from signal controller 600, main LC panel assembly 300a that selects or the gate drivers 400 of inferior LC panel assembly 300b are applied to gate lines G 1-Gn with grid cut-in voltage Von, and conducting connects on-off element Q thereon then.The data voltage that is applied to data line D1-Dm offers pixel by the on-off element Q that activates.

Can be provided for the data voltage of black by data line D1-Dm to non-selected main LC panel assembly 300a or inferior LC panel assembly 300b from signal controller 600 or independent device.

Be applied to the data voltage of pixel and the difference of common electric voltage Vcom and be expressed as LC capacitor C _LcCharging voltage, i.e. pixel voltage.Depend on the amplitude of pixel voltage, liquid crystal molecule has directivity.

Based on the opening degree induced signal from opening degree sensor 960, back light unit 900 is controlled the luminous of lamp unit 910.The operation of back light unit 900 below will be described.

Light from lamp unit 910 transmits by LC layer 3, changes its polarity then according to the direction of liquid crystal molecule.Polarizer converts light polarization direction to the transmittance direction.

By (representing with " 1H " with horizontal cycle, equal the one-period of horizontal-drive signal Hsync and data enable signal DE) repeat this process for unit, in a frame, all gate lines G 1-Gn are provided grid cut-in voltage Von successively, thus data voltage are applied to all pixels.When a frame end, when next frame began, control was applied to the reverse control signal RVS of data driver 500 so that the reversal of poles of data voltage (being referred to as " frame counter-rotating ").Also can control reverse control signal RVS, counter-rotating (has for example taken place in the data voltage polarity that flows in the data line in a frame like this, line counter-rotating and some counter-rotating), or counter-rotating (for example, row counter-rotating and some counter-rotating) has taken place in the polarity of the data voltage in a packet.

Now, with reference to figure 2,4 to 7 in detail, the operation of back light unit 900 according to an embodiment of the invention will be described.

Fig. 7 is the process flow diagram of lamp controller according to an embodiment of the invention.

As mentioned above, lamp unit 910 comprises a plurality of LED L1-L6, and its (+) terminal is connected to public terminal A jointly, and public terminal A is connected to lamp controller 970, and (-) terminal is connected to corresponding lead-out terminal B1-B6, and lead-out terminal B1-B6 is connected respectively to lamp controller 970.

Below will describe the operation of back light unit 900 in detail.

After supply voltage was applied to back light unit 900, lamp controller 970 imposed on (+) terminal of LED L1-L6 with the required voltage of LED L1-L6 operation as about 3.3V.That is, the voltage of lead 611 transmission by PCB 610 is transferred to the signal wire 951 of PCB 950 and the signal wire 371 of FPC plate 370 by contact 619, and is applied to (+) terminal of all LED L1-L6.

Yet owing to there is not voltage to be applied to output terminal B1-B6, electric current does not flow by LED L1-L6, so LED L1-L6 turn-offs.

Then, lamp controller 970 reads the opening degree induced signal (S101) from opening degree sensor 960, and the opening degree of definite mobile phone (S102).

When the voltage of opening degree induced signal greater than predetermined voltage, lamp controller 970 determines that two LCD are opened to scheduled volume or more from the main body of mobile phone.Like this, lamp controller 970 determines that main display panel 330a is in the state that is selected to display image.

Therefore, all LED L1-L6 of lamp controller 970 conducting lamp unit 910.Be conducting LEDL1-L6, lamp controller 970 by PCB 610 lead 612-617 and the signal wire 372-377 of FPC plate 370 respectively with the lead 952-957 ground connection of PCB 950.

Like this, LED conducting (S103), thus light is transferred to main LC panel assembly 300a and time LC panel assembly 300b simultaneously.Simultaneously, the gate drivers of inferior display panel 330b is not transferred to gate line with grid cut-in voltage Von.Therefore, though be used for the data line that the data voltage of main display panel 330a is applied to time LC panel assembly 300b, can not be at inferior display panel 330b display image.

Then, lamp controller 970 reads the opening degree induced signal from opening degree sensor 960, and whether two LCD of definite mobile phone close (S101 and S102).

When the voltage ratio predetermined voltage of opening degree induced signal hour, lamp controller 970 is determined the main body of two LCD near mobile phone.That is, lamp controller 970 determines that time display panel 330b is in the state that is selected to display image.

Then, one period schedule time of the LED of lamp controller 970 conducting predetermined quantities, turn-off remaining LED (S104 and S105) then.At this moment, as shown in Figure 6, be arranged near the LED L2-L5 conducting in edge of time display panel 330b, turn-off away from the LED L1 of edge setting and the remaining part of L6.

By lighting LED L2-L5, light offers main LC panel assembly 300a and time LC panel assembly 300b.

At this moment, the gate drivers 400 of main display panel 330b is not transferred to gate lines G 1-Gn with grid cut-in voltage Von.Therefore, though the data voltage of inferior display panel 330b is applied to the data line D1-Dm of main display panel 330a, display image not on main display panel 330a.

Consider the size and dimension of time display panel 330b, quantity and the configuration of the LED of conducting or shutoff to change.

For lighting LED L2-L5, lamp controller 970 stops voltage application, that is, be connected to the LED L1 of

signal wire

612 and 617 and (-) terminal of L6 and be grounded (S106), imposes on the ground of output terminal B1 and B6 with cut-out.

At this moment, lamp controller 970 keeps remaining signal wire 613-616 ground connection, like this lead-out terminal B2-B5 ground connection constantly.

The result, when signal just shows on the inferior display panel 330b littler than main display panel 330a, size based on the display panel of selecting, only selectively LED conducting, rather than light all LEDL1-L6 with the change light intensity that 910 emissions come from the lamp unit, so the unnecessary consumption of power supply has reduced.

As selection, some LED corresponding to the edge setting of inferior display panel 330b can be provided the voltage greater than the voltage that is applied to the remaining LED that is provided with away from the edge, to change the intensity of lamp unit 910.And when selecting time display panel 330b, the intensity of lamp unit 910 can change by the voltage that minimizing is applied to each lamp such as LED L1-L6.

According to embodiments of the invention, in the two LCD that comprise a plurality of display panels (as main display panel and time display panel), when image is when showing on the inferior display panel less than main display panel, the intensity of the lamp of predetermined quantity has changed.Like this, when not needing some light time, reduced, thereby reduced the whole power consumption of two LCD by the power of lamp consumption.

Then, with reference to figure 8 to 12, an alternative embodiment of the invention will be described.With Fig. 1 to 7 contrast, represent to carry out the element of identical operation with identical Reference numeral, and omitted its detailed description.

Fig. 8 is decomposition diagrams according to another embodiment of the invention, two LCD, and Fig. 9 is mounted in the block diagram of the LCD on the two LCD master's display panels shown in Fig. 8;

Be different from two LCD, comprise lamp unit 920 with a plurality of LED L7-L12 according to two LCD of this embodiment of the invention according to the embodiment of the invention referring to figs. 1 to 7, and the lamp unit 910 with LED L1-L6.Like this, also comprise the PCB 960 that lamp unit 920 is installed thereon according to two LCD of this embodiment of the invention, and and the PCB 950 that installs together of lamp unit 910.

As shown in Figure 8, PCB 950 is positioned at the edge of model frame 336, that is, near an edge of minor axis, PCB 960 is positioned near the relative position of PCB 950, that is, be positioned near another edge of minor axis of model frame 336.

Except that FPC plate 350,360 and 370, two LCD are also included within the FPC plate 380 of transmission signals between lamp unit 920 and the PCB 610 or data.

As shown in Figure 8, the viewing area of exposing main LC assembly 300a and time LC assembly 300b respectively by

windows

365 and 366 preceding and rear chassis 361 and 362.Main LC assembly 300a is by receiving from the light of

lamp unit

910 and 920 and display image, and inferior LC assembly 300b is by receiving from the light of lamp unit 910 and display image.

With reference to figure 8,

lamp unit

910 and 920 is fixed on the two ends of model frame 336 along Y-axis, and they offer light at least one side of main LC assembly 300a and time LC assembly 300b respectively.

Except above-described architectural feature, the structure of Fig. 8 and the two LCD shown in 9 structure with the two LCD shown in Fig. 1 and Fig. 2 basically is identical, has therefore omitted detailed description.

Then, with reference to Figure 10, with detailed description be used for

lamp

910 and 920 in signal wire 6 that forms on PCB 610 and

PCB

950 and 960 and the relation between the signal wire.

Figure 10 be according to another embodiment of the invention, explanation is at PCB and be used for signal wire that the PCB of lamp forms and the synoptic diagram that is used for annexation lamp, between the signal wire that forms on flexible print circuit (FPC) plate.

With reference to Figure 10, a plurality of signal wires 351,371-377 and 381-387 are formed on main FPC plate 350, are used for the

FPC plate

370 and 380 of

lamp

910 and 920.

Be connected to a plurality of leads 621 that are formed on the PCB610 at the signal wire 351 shown in the upper left of Figure 10 by contact 619, and be connected to a plurality of lead 951-957 that are formed on the PCB 950 by contact 959.

Same, be connected to a plurality of leads 642 that are formed on the PCB 610 at signal wire 381-387 shown in the right-hand component of Figure 10, that be formed on the PFC plate 380 by contact 619, and be connected to a plurality of leads 951 and the 962-967 that is formed on the PCB 950 by contact 959.

Signal wire 351,371-377 and 381-387 comprise be used for transmission voltage, control signal and data or the like signal wire 351 (this signal wire need be used to operate integrated chip 620) and give lamp unit 910 and the signal wire 371-377 and the 381-387 of each LED L1-L12 transmission drive signal of 920.The signal wire and the lead of a plurality of transmission of control signals and data etc. can also be formed on PCB 610,

FPC plate

370 and 380, the

PCB

950 and 960, and the quantity of signal wire and lead is decided by the operation of two LCD.A plurality of circuit components that are connected to lead 621,622 and 642 are installed on the PCB 610.Except that lead 621,622 and 642, the signal wire (not shown) of a plurality of reception control signals etc. also is formed on the PCB 610.Though not shown, a plurality of signal wires are formed on time FPC plate 360, are transferred to time LC panel assembly 300b by these signal wire data or control signal from main LC panel assembly 300a.

According to present embodiment of the present invention, because the operation of two LCD is identical with the operation referring to figs. 1 to 3 described couples of LCD, so omitted operation according to two LCD of present embodiment of the present invention.

Yet, will describe in detail according to the lamp unit 910 of the embodiment of the invention and 920 operation with reference to Figure 10 to 12.

Figure 11 is the circuit diagram according to the lamp unit of the embodiment of the invention, Figure 12 according to present embodiment of the present invention, the luminance that is installed in the LED on main display panel and the inferior display panel is shown.

As mentioned above,

lamp unit

910 and 920 comprises a plurality of LED L1-L6 and L7-L12 respectively.(+) terminal of each LED L1-L6 and L7-L12 is commonly connected to the common port A that is connected with lamp controller 970, and each (-) terminal is connected with corresponding lead-out terminal B1-B12, and wherein lead-out terminal B1-B12 is connected respectively to lamp controller 970.

The operation of the lamp controller 970 of

lamp unit

910 and 920 conductings or shutoff is identical with the operation of the process flow diagram shown in Fig. 7 basically.

That is, by supply voltage being applied to transducer 900, lamp controller 970 brings into operation after (S100), and lamp controller 970 will apply the required voltage of operation LED L1-L12 to (+) terminal of LED L1-L12, as about 3.3V.

Therefore, as shown in figure 10, the voltage of lead 611 transmission by PCB 610 is transferred to the

signal wire

371 and 381 of the signal wire 951 of

PCB

950 and 960 and

FPC plate

370 and 380 to be applied to (+) terminal of all LED L1-L12 by contact 619.Yet owing to there is not voltage to be applied to lead-out terminal B1-B12, electric current can not pass through LED L1-L12, so LED L1-L12 turn-offs.

When the voltage of opening degree induced signal greater than predetermined voltage, lamp controller 970 is determined from the main bodys of mobile phone two LCD to be opened to scheduled volume or more.Like this, lamp controller 970 has determined to select the state of main display panel 330a with display image.

Therefore, lamp controller 970 conducting lamp unit 910 and all LED L1-L12 of 920.Be conducting LED L1-L12, lamp controller 970 by PCB 610 lead 612-617 and the signal wire 372-377 of 632-637 and

FPC plate

370 and 380 and 382-387 respectively with the lead 952-957 and the 962-967 ground connection of

PCB

950 and 960.

Like this, LED L1-L12 conducting (S103), and light is transferred on main LC panel assembly 300a and time LC panel assembly 300b simultaneously.Simultaneously, the gate drivers of inferior display panel 330b is not transferred to grid cut-in voltage Von the gate line of time LC panel assembly 300b.Therefore, though will be used for the data line that the data voltage of main display panel 330a is applied to time LC panel assembly 300b, can not be on inferior display panel 330b display image.

Then, lamp controller 970 reads the opening degree induced signal from opening degree sensor 960, and whether two LCD of definite mobile phone open (S101 and S102).

When the voltage ratio predetermined voltage of opening degree induced signal hour, lamp controller 970 is determined the main body of two LCD near mobile phone.That is, lamp controller 970 has determined to select time display panel 330b to be used for the state of display image.

Then, one period schedule time of the LED of lamp controller 970 conducting predetermined quantities, turn-off remaining LED (S104 and S105) then.For example, conducting is arranged on the LED L1-L6 of lamp unit 910 of the side of time display panel 330b.

At this moment, the gate drivers 400 of main display panel 330a is not transferred to grid cut-in voltage Von the gate lines G 1-Gn of LC panel assembly 300a.Therefore, though the data voltage of inferior LC panel assembly 330b is applied to the data line D1-Dm of main LC panel 330a, display image not on main display panel 330a.

In this case, lamp controller 970 stops to apply voltage, just stops to be connected to (-) terminal ground connection (S106) of the LED L7-L12 of signal wire 632-637, imposes on the ground voltage of output terminal B7-B12 with cut-out.At this moment, lamp controller 970 keeps remaining signal wire 612-617 ground connection, and voltage is continuously applied output terminal B1-B6 in this wise.

As a result, when image just shows on the inferior display panel 330b littler than main display panel 330a, only selectively LED conducting, rather than light all LED, so the unnecessary consumption of power supply has reduced.

As mentioned above, after LED L1-L12 is divided into two

lamp unit

910 and 920, when selecting main display panel 330a to come display image, the

lamp unit

910 and 920 that lamp controller 970 conductings are all, and when selecting time display panel 330b to come display image, lamp controller 970 is in the conducting lamp unit 910 and 920.Each

lamp unit

910 and 920 conducting simultaneously or shutoffs.

According to embodiments of the invention, in the two LCD that comprise such as a plurality of display panels of main display panel and time display panel and a plurality of lamps unit, when image when on inferior display panel, showing less than main display panel, lamp unit of a conducting.Like this, the quantity of the lamp of conducting has reduced, thereby power consumption has also reduced.

In an embodiment of the present invention, the lamp unit comprises LED, but can comprise fluorescent light such as CCFL (cold-cathode fluorescence lamp) or EEFL (external-electrode fluorescent lamp).And, consider the operation of two LCD, the quantity of LED can change.

With reference to preferred embodiment, described the present invention in detail.Be to be understood that the present invention is not limited to the disclosed embodiments, on the contrary, but tend to cover various modifications and the equivalent that comprises in the spirit and scope of accessory claim.

Claims

1, a kind of display device comprises:

First printing board PCB, it comprises a plurality of lamps, is connected to first lead of lamp, and a plurality of second leads that are connected to lamp;

Flexible print circuit FPC plate, it comprises first signal wire that is connected respectively to first lead, and a plurality of secondary signal lines that are connected to second lead;

The 2nd PCB, it comprises the privates that is connected to first signal wire, and a plurality of privates that are connected to the secondary signal line;

The lamp control module, it imposes on privates with first voltage, and second voltage is imposed on privates, and selects signal controlling second voltage application based on exterior panel; And

Be provided with first and second display panels simultaneously from the light of lamp;

Wherein the lamp control module is installed on the 2nd PCB, and based on the difference of first voltage and second voltage by lighting lamp, lamp offers first and second display panels with light, and lamp is a LED.

2, the display device of claim 1, wherein first voltage is greater than second voltage.

3, the display device of claim 1, wherein the first voltage common transmission is given the terminal of each LED, and second voltage is transferred to other terminals of each LED separately, and

Select signal based on panel, the lamp control module controls to second voltage application of each other terminals of LED.