CN100337150C

CN100337150C - Liquid-crystal displaying device with chroma sensing function

Info

Publication number: CN100337150C
Application number: CNB2004100428203A
Authority: CN
Inventors: 黄志濠; 廖烝贤
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2004-05-26
Filing date: 2004-05-26
Publication date: 2007-09-12
Anticipated expiration: 2024-05-26
Also published as: CN1584694A

Abstract

The present invention relates to a liquid crystal display which comprises an LED back light module and a liquid crystal panel, wherein the LED back light module at least comprises a red light LED, a green light LED and a blue light LED; the liquid crystal panel comprises a color filter plate, a liquid crystal layer and a TFT plate, the color filter plate is arranged on the LED back light module, and the upper surface of the color filter plate is provided with a plurality of groups of red filter units, a plurality of green filter units and a plurality of blue filter units; the liquid crystal layer is arranged on the color filter plate, and the TFT plate is arranged on the liquid crystal layer. The lower surface of the TFT plate comprises at least three light sensing components, and each light sensing component is respectively corresponding to one red filter unit, one green filter unit and one filter unit of the color filter plate.

Description

LCD with chromaticness brake

Technical field

The present invention is about a kind of LCD, particularly about a kind of LCD with colourity sensing and adjusting function.

Background technology

LED (Light Emitting Diode, light emitting diode) backlight will have breakthrough help to LCD, main cause is that the luminous efficacy of LED has obtained significantly to improve recently, it is generally acknowledged the LED of present stage, technical possessed the usefulness of cold cathode fluorescent lamp about half, in addition to the luminous efficacy of LED in 2005 be expected to run neck and neck with cold cathode fluorescent lamp.And LED itself has the advantage of low power consumption and low heating, be applied in LCD and then have characteristics such as high sophistication, high brightness, no mercury, high color reprodubility, therefore, can give LCD higher surcharge with LED as backlight, in view of this, the LED-backlit source will be thorough and comprehensive to the influence of LCD future development trend.

Compare with the light source of existing other kind, the characteristics of LED maximum should belong to three kinds of coloured light of trichromatic red, green, blue that it can provide light first.Existing with the LCD of white light source (as cold cathode fluorescent lamp) as backlight among, the generation of color relies upon the color filter in the liquid crystal panel fully.

Please refer to Fig. 1, Fig. 2 is an available liquid crystal display parent map.Among LCD 10, one backlight module 12 can provide the white backlight source to give the liquid crystal panel 14 of its top, backlight module 12 usually with cold cathode fluorescent lamp 121 as its light source, and cooperate light guide plate 123 and multilayer optical film 125, and be assembled in the framework 127.And liquid crystal panel 14 is formed by injecting the liquid crystal layer 17 of a liquid state in the middle of a TFT plate 16 and the color filter 18.Wherein, has pixel electrode (sub-pixel electrode) 161,162 and 163 three times corresponding to each pixel (pixel) in the TFT plate 16, can disengage voltage and regulate and control the anglec of rotation of liquid crystal molecule in the liquid crystal layer 17, to cause the various penetrance of light; Then have red filter unit 181, one a green filter unit 182 and a blue filter unit 183 corresponding to each pixel in the color filter 18, if the light of different penetrances does not pass through this three kinds of filter units, then LCD 10 only can demonstrate the pattern of GTG, and does not have a color.

It should be noted that, color filter 18 is a kind of blooming piece that can not be regulated and control, therefore for the regulation and control of the colourity (chromaticity) of LCD, voltage one way that regulation and control time pixel electrode 161,162 and 163 are then only arranged technically, utilize the penetrance that changes indivedual coloured light to regulate and control colourity, but such way will increase the weight of the complexity for the drive signal calculation of liquid crystal panel significantly.And the brightness of regulation and control backlight module 12 then only can influence the color contrast of LCD 10 integral body, can't regulate and control red, green or blue proportion individually, and can't take into account the brightness and the color contrast of LCD.Therefore, the existing LCD that has the white backlight source merely generally has the not high shortcoming of color saturation.

Therefore, can provide the LED-backlit module of three kinds of coloured light of red, green, blue to solve the preferred plan of the not high shortcoming of above-mentioned LCD color saturation beyond doubt.See also Fig. 2, Fig. 2 is existing LED-backlit module diagram.Have among the LED-backlit module 20 of three-color light source, because be able at source ends 22 regulation and control Red Green Blues, therefore, compared to the LCD (only can regulate and control colourity on liquid crystal panel) in above-mentioned white backlight source, LED-backlit module 20 obviously can make LCD have better color reprodubility.

In addition, among LED-backlit module 20, can be provided with corresponding to trichromatic three kinds of optical sensing subassemblies (photo sensor) 24R, 24G, 24B, with after the GTG brightness of difference sensing red, green, blue three looks, send signal to colourity controller 26 and calculate, and form a loop and come red-light LED 28R, green light LED 28G and blue-ray LED 28B are regulated and control respectively.And

optical sensing subassembly

24R, 24G, 24B can sense the light signal of three kinds of different colours of red, green, blue respectively, because its surface has been coated with different filters respectively.

For the position that is provided with of

optical sensing subassembly

24R, 24G, 24B, existing in the prior art many discussion and different embodiments.As shown in Figure 2, in the prior art of Fig. 2, the source ends 22 of LED-backlit module 30 is arranged at the front and back two side ends of light guide plate 123, wherein light guide plate 123, red-light LED 28R, green light LED 28G and blue-ray LED 28B can insert among the framework 29, and

optical sensing subassembly

24R, 24G, 24B place LED-backlit module 20 about two sides, then need be in the enforcement for two sidewall holes about framework 29, so that

optical sensing subassembly

24R, 24G, 24B to be installed; Yet, but not, therefore has the representative not enough problem of the signal that records at mixed light effect middle position preferably because it is provided with the position at side.

Prior art is as shown in Figure 3 also arranged, in LED-backlit module 30,

optical sensing subassembly

24R, 24G, 24B are arranged at the middle position of framework 29 base plates, and the prior art of this kind also needs the base plate holes to framework 29 when implementing, so that the base of

optical sensing subassembly

24R, 24G, 24B to be installed.Prior art compared to Fig. 2, the prior art of Fig. 3 is because of being arranged on

optical sensing subassembly

24R, 24G, 24B the middle position of LED-backlit module 30, therefore its measured signal is representative preferable, yet, therefore

optical sensing subassembly

24R, 24G, 24B are easier to influence the light mixing mechanism of three kinds of coloured light because of being arranged on the position near optical path central authorities among Fig. 3.

And discuss the representativeness of the measured signal of optical sensing subassembly, be coated with the filter of three kinds of colors respectively though then more should be noted that

optical sensing subassembly

24R, 24G, 24B surface, these filters not exclusively are equal to the color filter in the liquid crystal panel after all.Therefore, the colourity that colourity that optical sensing subassembly sensed and user are seen may be also inequality, may have a deviate between the two.Therefore, among existing LCD with LED-backlit module, the measured signal of optical sensing subassembly still must be done further correction with the colourity that color filter is seen, the loaded down with trivial details and many one decks error of process.

Comprehensive the above, what existing technology lacked is a kind of LCD with LED-backlit module, and, be that a kind of optical sensing subassembly does not wherein need the backlight module holes installing, and can not cause dysgenic LCD the light mixing mechanism of LED-backlit module; In addition, prior art more lacks a kind of LCD with LED-backlit module, and the measured carrier chrominance signal of optical sensing subassembly wherein has enough representativenesses.

Summary of the invention

Fundamental purpose of the present invention is to provide a kind of LCD, and it just can finish the installation of optical sensing subassembly under situation about not needing the backlight module holes.

Another object of the present invention is to provide a kind of LCD, its optical sensing subassembly of installing can not influence the light mixing mechanism of LED-backlit module.

Another object of the present invention is to provide a kind of LCD, it can improve the representativeness of the measured carrier chrominance signal of optical sensing subassembly.

LCD of the present invention comprises a LED-backlit module and a liquid crystal panel.Wherein, the LED-backlit module comprises a red-light LED, a green light LED and a blue-ray LED at least, is arranged among its framework; In addition, the LED-backlit module has more a light guide plate and multilayer optical film is arranged on its framework.

Liquid crystal panel then comprises a color filter, a liquid crystal layer and a TFT plate.Wherein, color filter is arranged on the LED-backlit module; Liquid crystal layer is arranged on the color filter; The TFT plate then is arranged on the liquid crystal layer.

Color filter is a glass substrate, and its upper surface has a plurality of red filter unit of array, a plurality of green filter unit and a plurality of blue filter unit.

The TFT plate is a glass substrate, and its lower surface includes a plurality of pixel electrodes and at least three optical sensing subassemblies (photo sensor).And each optical sensing subassembly corresponds respectively to the red filter unit of one of color filter, a green filter unit and a blue filter unit.

Liquid crystal layer is a fluid, comprising numerous liquid crystal molecule is arranged, and injects among the space of above-mentioned color filter and TFT plate institute interlayer; Described pixel electrode of TFT plate can be in order to the anglec of rotation of liquid crystal molecule in the regulation and control liquid crystal layer, with the penetrance of regulation and control from the light of below LED-backlit module.

And the light that the LED-backlit module is sent penetrates after color filter and the liquid crystal layer, when being about to by the TFT plate, and can be by the optical sensing subassembly sensing in the TFT plate; In other words, optical sensing subassembly can sense the colourity of the shown image of LCD.

Comprehensive the above, LCD of the present invention is used the LED-backlit module, therefore can regulate and control the primaries of red, green, blue respectively at the backlight place, makes that the colourity performance of LCD is more outstanding.

In addition, the present invention is arranged at optical sensing subassembly in the liquid crystal panel, except can avoiding needing to the backlight module holes installing the existing shortcoming of optical sensing subassembly, and can make the LED-backlit module not be arranged at the harmful effect that wherein produces light mixing mechanism because of optical diode.

The more important thing is that LCD of the present invention at first penetrates after the color filter light of LED-backlit module, again by liquid crystal layer and TFT plate; Such configuration mode, not only make the surface of optical sensing subassembly not need to be coated with filter, and the colourity of its sensing is the true colourity of the image of liquid crystal display displays, therefore, the present invention has the LCD of LED-backlit module, and the measured carrier chrominance signal of optical sensing subassembly wherein has enough representativenesses.

Description of drawings

Fig. 1 is existing LCD parent map;

Fig. 2 is existing LED-backlit module diagram;

Fig. 3 is arranged at central authorities for the source ends that shows existing LED-backlit module;

Fig. 4 is the exploded perspective view of LCD of the present invention;

Fig. 5 A is the equivalent circuit diagram of partial graph four TFT plates;

Fig. 5 B has the inferior pixel enlarged drawing of optical sensing subassembly for Fig. 5 A;

Fig. 6 shows another embodiment of LCD of the present invention;

Fig. 7 shows another embodiment of LCD of the present invention;

Fig. 8 shows another embodiment of LCD of the present invention; And

Fig. 9 shows another embodiment of LCD of the present invention.

The figure number explanation

LCD 10 backlight modules 12 cold cathode fluorescent lamp 121

Light guide plate 123 plural layer optical thin films 125 frameworks 127

Liquid crystal panel 14 TFT plates 16 liquid crystal layers 17

Inferior pixel electrode 161,162,163 color filters 18

Red filter unit 181 green filter units 182

Blue filter unit 183 source ends 22

LED-

backlit module

20,30

optical sensing subassembly

24R, 24G, 24B

Colourity controller 26 red-light LED 28R

Green light LED 28G blue-ray LED 28B

Framework 29 LCD 50

LED-backlit module 52 frameworks 521

Light guide plate 523 multilayer optical films 525

Red-light LED 52R green light LED 52G

Blue-ray LED 52B liquid crystal panel 54

Color filter 56 red filter unit 56R

The blue filter unit 56B of green filter unit 56G

Liquid crystal layer 57 TFT plates 58

Inferior pixel electrode 581 thin film transistor (TFT)s 583

Signal wire 585,585S gate line 587,587S

Colourity controller 59 osd controllers 591

Optical sensing subassembly 60,60RGB micro lens 601

Optical diode 603 auxiliary transistors 605

Upper substrate 61 infrabasal plates 63

Color filter 631 TFT plates 633

Embodiment

Please refer to Fig. 4, Fig. 4 is the exploded perspective view of LCD of the present invention.LCD 50 comprises a LED-backlit module 52 and a liquid crystal panel 54; Wherein,

LED-backlit module 52 comprises a red-light LED 52R, a green light LED 52G and a blue-ray LED 52B at least, is arranged among its framework 521, has used six groups of red, green, blue LED to amount to 18 in the present embodiment altogether;

And as shown in Figure 4, LED-backlit module 52 has more a light guide plate 523, and light guide plate 523 can be arranged in the framework 521 with these LED, and multilayer optical film 525 is arranged on the exiting surface of light guide plate 523.

54 of liquid crystal panels comprise a color filter 56, a liquid crystal layer 57 and a TFT plate 58.Wherein, color filter 56 is arranged on the LED-backlit module 52; Liquid crystal layer 57 is arranged on the color filter 56; TFT plate 58 then is arranged on the liquid crystal layer 57.

Color filter 56 is a glass substrate, and its upper surface has a plurality of red filter unit 56R of array, a plurality of green filter unit 56G and a plurality of blue filter unit 56B.

TFT plate 58 is a glass substrate, and its lower surface includes a plurality of pixel electrodes 581 and at least three optical sensing subassemblies (photo sensor) 60.Each time pixel electrode 581 defines one pixel in the liquid crystal panel 54;

And among the embodiment as Fig. 4, three optical sensing subassemblies (photo sensor) 60 are arranged at respectively in three pixels of TFT plate 58 middle bodies, and wherein each optical sensing subassembly 60 corresponds respectively to the red filter unit 56R of one of color filter 56, a green filter unit 56G and a blue filter unit 56B.

Liquid crystal layer 57 is a fluid, comprising numerous liquid crystal molecule is arranged, is arranged among the space of above-mentioned

color filter

56 and 58 interlayers of TFT plate; Described pixel electrode 581 of TFT plate 58 can be in order to the anglec of rotation of liquid crystal molecule in the regulation and control liquid crystal layer 57, with the penetrance of regulation and control from the light of below LED-backlit module 52.

And the light that LED-backlit module 52 is sent, after penetrating color filter 56 and liquid crystal layer 57, when being about to by TFT plate 58, can be by 60 sensings of the optical sensing subassembly in the TFT plate; In other words, optical sensing subassembly 60 can sense the colourity of the shown image of LCD 50.

Please continue with reference to Fig. 4, more comprise a colourity controller 59 among the LCD 50, after the signal that colourity controller 59 reception optical sensing subassemblies 60 are transmitted, can regulate and control respectively red-light LED 52R, green light LED 52G and blue-ray LED 52B, and go into a regulation and control loop.Therefore LCD 50 of the present invention can be when show image, the colourity of the shown image of sensing self constantly, the regulation and control of the circumstances in which people get things ready for a trip of going forward side by side degree.

In addition, the signal that colourity controller 59 can be transmitted according to one of this LCD 50 osd controller 591 is to regulate and control respectively red-light LED 52R, green light LED 52G and blue-ray LED 52B; Osd controller 591 is connected to the button of LCD, so the user can be by the above-mentioned button of operation, so that LCD 50 of the present invention is carried out the regulation and control of colourity.

Please refer to Fig. 5 A with further understanding the present invention, Fig. 5 A is the equivalent circuit diagram of the TFT plate of partial graph 4.As mentioned above, TFT plate 58 lower surfaces include pixel electrode 581 a plurality of times, each time pixel electrode is made by transparent conductive material (as ITO), and be connected to a thin film transistor (TFT) 583, by signal wire 585 and horizontal 587 adjustable all thin film transistor (TFT)s 583 of gate line longitudinally, so that a plurality of pixel electrodes 581 produce different voltage, regulate and control the liquid crystal molecule in the above-mentioned liquid crystal layer 57.

And in the embodiment of Fig. 4 and Fig. 5 A, the present invention is arranged at three optical sensing subassemblies 60 respectively in three pixels of TFT plate 58 middle bodies, each optical sensing subassembly 60 is arranged at the diagonal position of thin film transistor (TFT) 583, so that can drop to minimum to the influence of this time aperture ratio of pixels.Optical sensing subassembly 60 is connected with gate line 587S and signal wire 585S, when it senses the colourity of light, can signal be exported by signal wire 585S.

Please refer to Fig. 5 B, Fig. 5 B has the inferior pixel enlarged drawing of optical sensing subassembly for one of Fig. 5 A.Clearly express the relativeness of above-mentioned thin film transistor (TFT) 583, inferior pixel electrode 581 and optical sensing subassembly 60 in the inferior pixel 59.Wherein, optical sensing subassembly 60 comprises a micro lens (micro lens) 601, one optical diode (photo diode) 603 and one auxiliary transistor 605; Micro lens 601 can be concentrated to light optical diode 603, and optical diode 603 can produce the variation of voltage because of light, and this change in voltage is converted to signal and is exported by auxiliary transistor 605.

Please refer to Fig. 6, Fig. 6 shows another embodiment of LCD of the present invention.In this embodiment, the lower surface of TFT plate 58 includes a plurality of pixel electrodes 581 and a plurality of optical sensing subassembly (photosensor) 60, and the blue filter unit 56B of the red filter unit 56R of each in the color filter 56, each green filter unit 56G and each top all has a pixel electrode 581 and an optical sensing subassembly 60.

Embodiment compared to Fig. 4 only is provided with totally three optical sensing subassemblies 60, and the described embodiment of Fig. 6 all is provided with optical sensing subassembly 60 in each time pixel; Though this embodiment can make colourity controller 59 have heavier signal Processing burden, yet can make that the colourity sensing function of LCD 50 is the most comprehensive, all can be monitored for the demonstration situation of wherein each time pixel.

Please refer to Fig. 7, Fig. 7 shows another embodiment of LCD of the present invention.TFT plate 58 lower surfaces include a plurality of pixel electrodes 581 and four optical sensing subassembly group 60RGB, wherein, each optical sensing subassembly group 60RGB comprises three optical sensing subassemblies 60, these three optical sensing subassemblies 60 correspond to the red filter unit 56R of one of color filter 56, a green filter unit 56G and a blue filter unit 56B respectively, and these four optical sensing subassembly group 60RGB are evenly distributed on the TFT plate 58.

The embodiment of Fig. 7 is under the prerequisite of the signal Processing burden of taking cost and look modulator 59 into account, in response to a kind of embodiment that produces, utilize four groups of optical sensing subassembly average marks on TFT plate 58, to obtain carrier chrominance signal, the representativeness of its carrier chrominance signal is good than Fig. 4 embodiment; Yet its cost is then far below Fig. 6 embodiment, and the burden of signal Processing is light than Fig. 6 embodiment also.

In like manner, also can be just like the embodiment of Fig. 8, Fig. 8 shows another embodiment of LCD of the present invention.Wherein, TFT plate 58 lower surfaces include nine optical sensing subassembly group 60RGB, and these nine optical sensing subassembly group 60RGB are evenly distributed on the TFT plate 58.

Spirit of the present invention is that optical sensing subassembly group and array pixel electrodes arranged are designed in same integrated circuit structure, and after making the light of LED-backlit module can be earlier see through color filter to filter, utilize optical sensing subassembly light to be carried out the detection of colourity again, therefore, among the embodiment except above-mentioned Fig. 4, Fig. 6, Fig. 7 and Fig. 8, color filter is arranged at outside the close mode of LED-backlit module, embodiment as shown in Figure 9 can be arranged in addition.As shown in Figure 9, liquid crystal panel 54 has a upper substrate 61 and an infrabasal plate 63, and upper and lower substrate 61 and 63 can be glass substrate, and liquid crystal layer 57 settings and interlayer are between upper and lower substrate 61 and 63.In order to make the light dyeing that can filter earlier, therefore the lower surface that color filter 66 is arranged on infrabasal plate 63 (is the representation of explosive view in the icon, the enforcement lower surface of filter 66 of enameling) at infrabasal plate 63, and TFT plate 68 is arranged on the upper surface of infrabasal plate 61, wherein the optical sensing subassembly group 60RGB on the TFT plate 68 arranges and set-up mode can be with reference to the foregoing description.Thus, also can reach the effect of previous embodiment, and in the embodiment of Fig. 9, because it is promptly sensed that light does not pass through liquid crystal layer 57, therefore at follow-up colourity controller 59 during for the calculating of signal, can be because of need not considering the influence of the liquid crystal layer 57 light penetration rate that causes, and reduce the burden of its calculating.

Technical scheme of the present invention compared with prior art has many progressive parts:

At first, LCD of the present invention is used the LED-backlit module, therefore can regulate and control the primaries of red, green, blue respectively at the backlight place, makes that the colourity performance of LCD is more outstanding.

Claims

1. the LCD with chromaticness brake is characterized in that, comprising:

One LED-backlit module wherein comprises a red-light LED, a green light LED and a blue-ray LED at least; And

One liquid crystal panel, this liquid crystal panel comprises:

One color filter is arranged on this LED-backlit module, and its upper surface has array

A plurality of red filter units, a plurality of green filter unit and a plurality of blue filter unit;

One liquid crystal layer is arranged on this color filter; And

One TFT plate, be arranged on this liquid crystal layer, its lower surface includes a plurality of pixel electrodes and at least three optical sensing subassemblies, described pixel electrode is in order to regulate and control the anglec of rotation of liquid crystal molecule in this liquid crystal layer, and each optical sensing subassembly corresponds respectively to the red filter unit of one of this color filter, a green filter unit and a blue filter unit, with sensing via the light of this color filter the colourity from the shown image of this LCD.

2. the LCD with chromaticness brake as claimed in claim 1 is characterized in that, this LCD more comprises a colourity controller, to be used for this red-light LED, this green light LED and this blue-ray LED are regulated and control respectively.

3. the LCD with chromaticness brake as claimed in claim 2 is characterized in that, this colourity controller can receive the signal that described optical sensing subassembly transmits.

4. the LCD with chromaticness brake as claimed in claim 2 is characterized in that, this colourity controller can receive the signal that one of this LCD osd controller is transmitted.

5. the LCD with chromaticness brake is characterized in that, comprising:

One liquid crystal panel is arranged on this LED-backlit module, and this liquid crystal panel comprises a upper substrate and an infrabasal plate, wherein and comprise:

One liquid crystal layer is arranged between this upper and lower substrate;

One color filter is arranged at this infrabasal plate lower surface, and this color filter has a plurality of red filter unit of array, a plurality of green filter unit and a plurality of blue filter unit; And

One TFT plate, be arranged at this infrabasal plate upper surface and include a plurality of pixel electrodes and at least three optical sensing subassemblies, described pixel electrode is in order to regulate and control the anglec of rotation of liquid crystal molecule in this liquid crystal layer, and each optical sensing subassembly correspond respectively to this color filter this redness filter unit, this green filter unit and should the blueness filter unit, with sensing via the light of this color filter the colourity from the shown image of this LCD.

6. the LCD with chromaticness brake as claimed in claim 5 is characterized in that, this LCD more comprises a colourity controller, to be used for this red-light LED, this green light LED and this blue-ray LED are regulated and control respectively.

7. the LCD with chromaticness brake as claimed in claim 6 is characterized in that, this colourity controller can receive the signal that described optical sensing subassembly transmits.

8. the LCD with chromaticness brake as claimed in claim 6 is characterized in that, this colourity controller can receive the signal that one of this LCD osd controller is transmitted.