CN101359123A - Backlight module, liquid crystal display and control method thereof - Google Patents

Backlight module, liquid crystal display and control method thereof Download PDF

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Publication number
CN101359123A
CN101359123A CNA2007101382126A CN200710138212A CN101359123A CN 101359123 A CN101359123 A CN 101359123A CN A2007101382126 A CNA2007101382126 A CN A2007101382126A CN 200710138212 A CN200710138212 A CN 200710138212A CN 101359123 A CN101359123 A CN 101359123A
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level
clock
light
brightness
apart
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CN101359123B (en
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林弘裕
石明家
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Chi Mei Optoelectronics Corp
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Chi Mei Optoelectronics Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

A backlight module comprises a light-emitting unit and a control unit. The control unit controls the light-emitting unit through a duty cycle, wherein, in a first time-distance, the light brightness is a first level; and in a second time-distance, the light brightness changes from the first level to a second level. The duty cycle is defined as the ratio of the second time-distance to the sum of the first time-distance and the second time-distance.

Description

Backlight module, liquid crystal indicator and control method thereof
Technical field
The present invention relates to a kind of backlight module, liquid crystal indicator and control method thereof.
Background technology
Along with showing development of science and technology, display device and products thereof is used by people widely, and liquid crystal indicator is because of having that build is frivolous, low power consumption and advantageous characteristic such as radiationless, replace the conventional cathode ray tube display device gradually, and be applied to the electronic product of numerous species.
In general, existing liquid crystal indicator is controlled the light transmittance of the luminous of a backlight module and a display panels respectively to show different pictures.
Please refer to shown in Figure 1ly, it is presented in the above-mentioned liquid crystal indicator, when light luminance and light transmittance change in time, and the time dependent relation of the pixel intensity of picture.Backlight module is controlled and driven to light luminance with 50% duty cycle (duty cyc1e) is example.Wherein, at time t 11Before, display panels control light transmittance maintains T 11, so that the shown pixel intensity of liquid crystal indicator is normal variation according to the product of light luminance and light transmittance.
And at time t 11Afterwards, display panels control light transmittance is reduced to T 12, also can correspondingly reduce in the hope of pixel intensity.Yet, owing to the restriction that is subjected to the liquid crystal reaction velocity causes at time t 12Afterwards, light transmittance is not reduced to T as expection yet 12And cause the shown pixel intensity of liquid crystal indicator to produce extra brightness L Peak, and then make that the shown picture quality of liquid crystal indicator is bad.
Recently, the dealer is in order to address the above problem, generally can duty cycle be controlled and to drive backlight module luminous to reduce, produce extra brightness L to reduce PeakWherein, in order to reduce the duty cycle of light, backlight module must drive with higher current level, and causes the life-span of backlight module to be reduced.In addition, current level also can't unrestrictedly improve, and therefore can't effectively reduce to produce extra brightness L Peak
Therefore, how to provide a kind of and can not need change control and drive the luminous duty cycle of backlight module, but still can effectively reduce backlight module, liquid crystal indicator and control method thereof that extra brightness produces, just one of important topic of current display industry.
Summary of the invention
Because above-mentioned problem the purpose of this invention is to provide a kind of duty cycle that can not need change light, but still can effectively reduce backlight module, liquid crystal indicator and control method thereof that extra brightness produces.
Edge is for reaching above-mentioned purpose, to comprise a luminescence unit and a control module according to a kind of backlight module of the present invention.Control module is exported a light with duty cycle control luminescence unit.Wherein, one first o'clock apart from, the brightness of light is one first level, one second o'clock apart from, the brightness of light is gradual by first level to be one second level.Above-mentioned duty cycle be defined as second o'clock apart from first o'clock apart from and second o'clock ratio apart from sum.
For reaching above-mentioned purpose, according to the control method of a kind of backlight module of the present invention, wherein, backlight module has a control module and a luminescence unit.Control module is exported a light with duty cycle control luminescence unit, and control method comprises the following step: at first, one first o'clock apart from, the brightness of light is one first level; Then, one second o'clock apart from, the brightness of light is gradual by first level to be one second level, wherein, duty cycle be defined as second o'clock apart from first o'clock apart from and second o'clock ratio apart from sum.
For reaching above-mentioned purpose, comprise a display panels and a backlight module according to a kind of liquid crystal indicator of the present invention.Backlight module has a luminescence unit and a control module.Control module is exported a light to display panels with duty cycle control luminescence unit.Wherein, one first o'clock apart from, the brightness of light is one first level, one second o'clock apart from, the brightness of light is gradual by first level to be one second level.Above-mentioned duty cycle be defined as second o'clock apart from first o'clock apart from and second o'clock ratio apart from sum.
For reaching above-mentioned purpose, according to the control method of a kind of liquid crystal indicator of the present invention, wherein, liquid crystal indicator has a display panels and a backlight module, and backlight module has a control module and a luminescence unit.Control module is exported a light to display panels with duty cycle control luminescence unit, and control method comprises the following step: at first, one first o'clock apart from, the brightness of light is one first level; Then, one second o'clock apart from, the brightness of light is gradual by first level to be one second level, wherein, duty cycle be defined as second o'clock apart from first o'clock apart from and second o'clock ratio apart from sum.
From the above, because of according to backlight module of the present invention, liquid crystal indicator and control method thereof be second o'clock apart from, the brightness of light is gradual by first level to be second level, in other words, backlight module of the present invention, liquid crystal indicator and control method thereof are to change to reduce the generation of extra brightness by being controlled at not simultaneously apart from the level of the brightness of interior light, and need not change the duty cycle of light, not only can guarantee quality of display pictures, and can avoid reduce the serviceable life of backlight module.
Description of drawings
Fig. 1 shows in the available liquid crystal display device, when light luminance and light transmittance change in time, and the time dependent relation of the pixel intensity of picture;
Fig. 2 shows a liquid crystal indicator of preferred embodiment of the present invention;
In the liquid crystal indicator of Fig. 3 a to Fig. 3 i displayed map 2, the light intensity that luminescence unit is exported over time;
Fig. 4 shows another liquid crystal indicator of preferred embodiment of the present invention;
Fig. 5 shows the control method of the liquid crystal indicator of preferred embodiment of the present invention;
Fig. 6 shows the backlight module of preferred embodiment of the present invention; And
Fig. 7 shows the control method of the backlight module of preferred embodiment of the present invention.
The reference numeral explanation:
2: liquid crystal indicator
21: display panels
211: pel array
212: driver element
22: backlight module
221: luminescence unit
222: control module
23: the frame load module
24: the frame buffer module
25: analysis module
26: the over-drive value generation module
27: the frame output module
B 20: light
D 20: duty cycle
G 21: show the GTG value
G 22: GTG value to be shown
L 21: first level
L 22: second level
L 23: the 3rd level
L Peak: extra brightness
P 20: pixel
S 20: relation
S 21(t): part
S 22(t): another part
S100-S110: step
S200-S210: step
t 11, t 12: the time
t I1: first o'clock distance
t I2: second o'clock distance
t I21: a part
t I22: another part
t I0: the time distance
t I4: the time distance
T 11, T 12, T 20: light transmittance
V 20: over-drive value
Embodiment
Hereinafter with reference to correlative type, backlight module, liquid crystal indicator and control method thereof according to preferred embodiment of the present invention are described.
[liquid crystal indicator of preferred embodiment]
Please refer to shown in Figure 2ly, the liquid crystal indicator 2 of preferred embodiment comprises a display panels 21 and a backlight module 22.
Display panels 21 has a pel array 211 and a driver element 212, and wherein, driver element 212 can drive the liquid crystal rotation of pel array 211, so that light transmittance T 20Change.
Backlight module 22 has a luminescence unit 221 and a control module 222, and wherein, control module 222 is with a duty cycle D 20 Control luminescence unit 221 outputs one light B 20Pel array 211 to display panels 21.
Please be simultaneously with reference to shown in Fig. 2 and Fig. 3 a, duty cycle D 20Be defined as at one second o'clock apart from t I2With one first o'clock apart from t I1Reach at second o'clock apart from t I2The ratio of sum
Figure A20071013821200071
At first o'clock apart from t I1In, the brightness of light is one first level L 21, and at second o'clock apart from t I2In, the brightness of light concerns S according to one 20By the first level L 21Gradual is one second level L 22, in the present embodiment, the first level L 21Less than the second level L 22Wherein, concern S 20Different designs can be arranged according to actual state, for example, please refer to shown in Fig. 3 a to Fig. 3 h, concern S 20Can be a linearity (shown in Fig. 3 a), one stepped (shown in Fig. 3 b) or an arc shaped (shown in Fig. 3 c and Fig. 3 d).Certainly, also can under different time, apply mechanically the different S that concerns 20, for instance, shown in Fig. 3 e, wherein, the time apart from t I0In, the brightness of light is according to concerning S 20(linearity) is by the first level L 21Gradual is the second level L 22The time apart from t I2In, the brightness of light is according to concerning S 20(stepped) is by the first level L 21Gradual is the second level L 22The time apart from t I4In, the bright foundation of light concerns S 20(arc shaped) is by the first level L 21Gradual is the second level L 22
In addition, concern S 20Also can be constituted, wherein, be concerned S by two parts 20A part of S 21(t) make the brightness of light by the first level L 21Gradual is the second level L 22, and concern S 20Another part S 22(t) make the brightness of light maintain the second level L 22(shown in Fig. 3 f-Fig. 3 i).In the present embodiment, one the 3rd level L 23With second o'clock apart from t I2A part of t I21Product deduct at second o'clock apart from t I2A part of t I21(second o'clock apart from t for the brightness summation of middle light I2A part of t I21With concern S 20A part of S 21(t) area that is surrounded) equal in fact at second o'clock apart from t I2Another part t I22(second o'clock apart from t in the brightness of middle light I2Another part t I22With concern S 20Another part S 22(t) area that is surrounded) summation deducts the 3rd level L 23With second o'clock apart from t I2Another part t I22Product, shown in following formula:
Formula
Certainly, also can under different time, present the different S that concern 20(has part S 21(t) and part S 22(t)), do not give unnecessary details in this appearance.
Hold, please refer to again shown in Figure 2, because of according to liquid crystal indicator 2 of the present invention at second o'clock apart from t I2In, light B 20Brightness by the first level L 21Gradual is the second level L 22, so that at second o'clock apart from t I2In, the light transmittance T of pel array 211 20With light B 20The product of brightness be minimum, reduce the generation of extra brightness.Thus, not only can guarantee quality of display pictures, and can avoid backlight module 22 to make reduce serviceable life because improving the driving signal.
In addition, please refer to shown in Figure 4, light B 20Brightness be to concern S with what be inversely proportional to approximately with a liquid crystal reaction relation 20By the first level L 21Gradual is the second level L 22, so that at second o'clock apart from t I2In, the light transmittance T of pel array 211 20With light B 20The product of brightness be minimum, reduce the generation of extra brightness.And the liquid crystal reaction relation is the light transmittance T of definition reaction time and pel array 211 20Between relation, and liquid crystal reaction relation and environment temperature, liquid crystal material, the driving liquid crystal front and back of rotating show that GTG value etc. is relevant.
Wherein, liquid crystal indicator 2 more can comprise a frame load module 23, a frame buffer module 24, an analysis module 25, an over-drive value generation module 26 and a frame output module 27.Frame buffer module 24 electrically connects with frame load module 23, to export a plurality of pixel P 20A plurality of demonstration GTG value G 21To analysis module 25.And the described pixel P of frame load module 23 outputs 20GTG value G a plurality of to be shown 22To analysis module 25.Analysis module 25 is according to described demonstration GTG value G 21One of them and described GTG value G to be shown at least 22At least one of them, with real-time operation or deck watch than reciprocity mode and must concern S with the liquid crystal reaction relation is inversely proportional to approximately 20 Control module 222 is according to concerning S 20And duty cycle D 20With control luminescence unit 221 output light B 20
Over-drive value generation module 26 electrically connects with frame load module 23 and frame buffer module 24 respectively, with the described demonstration GTG value G of foundation 21One of them and described GTG value G to be shown at least 22At least one of them, obtain an over-drive value V with real-time operation or deck watch than reciprocity mode 20Frame output module 27 output over-drive value V 20To driver element 212 to drive pel array 211.
Hold, because of according to liquid crystal indicator of the present invention be second o'clock apart from, the brightness of light is gradual by first level to be second level, and second o'clock product apart from interior brightness and light transmittance, can compensate at first o'clock product, so that human eye can be experienced correct video data apart from interior brightness and light transmittance.In brief, the level of the brightness of the interior light of distance changes to reduce the generation of extra brightness liquid crystal indicator of the present invention by being controlled at not simultaneously, and need not reduce the duty cycle of light, not only can guarantee quality of display pictures, and can avoid reduce the serviceable life of backlight module.
[control method of the liquid crystal indicator of preferred embodiment]
Please refer to shown in Figure 5, the control method of the liquid crystal indicator of preferred embodiment, wherein, liquid crystal indicator has a display panels and a backlight module, backlight module has a control module and luminescence unit, control module is exported a light to display panels with duty cycle control luminescence unit, and control method comprises step S100 to step S110.
Step S100 be one first o'clock apart from, be one first level by the brightness of control module control light that luminescence unit is exported.
Step S110 be one second o'clock apart from, gradual by first level by the brightness of control module control light that luminescence unit is exported is one second level, wherein, duty cycle be defined as at second o'clock apart from first o'clock distance and second o'clock ratio apart from sum.
The control method of the liquid crystal indicator of present embodiment has described (as Fig. 2, Fig. 3 a to Fig. 3 i and shown in Figure 4) in detail in above-mentioned liquid crystal indicator 2, do not give unnecessary details in this appearance.
[backlight module of preferred embodiment]
Please refer to shown in Figure 6ly, the backlight module 22 of preferred embodiment comprises luminescence unit 221 and control module 222, and control module 222 is with duty cycle D 20 Control luminescence unit 221 output light B 20, duty cycle D 20Be defined as at second o'clock apart from t I2With first o'clock apart from t I1Reach at second o'clock apart from t I2The ratio of sum.At one first o'clock apart from t I1In, the brightness of light is one first level L 21, and at one second o'clock apart from t I2In, the brightness of light concerns S according to one 20By the first level L 21Gradual is one second level L 22
The backlight module 22 of present embodiment has described (as Fig. 2, Fig. 3 a to Fig. 3 i and shown in Figure 4) in detail in the backlight module 22 in above-mentioned liquid crystal indicator 2, do not give unnecessary details in this appearance.
[control method of the backlight module of preferred embodiment]
Please refer to shown in Figure 7, the control method of the backlight module of preferred embodiment, wherein, backlight module has a control module and luminescence unit, control module is exported a light with duty cycle control luminescence unit, control method comprises step S200 to step S210.
Step S200 be one first o'clock apart from, be one first level by the brightness of control module control light that luminescence unit is exported.
Step S210 be one second o'clock apart from, gradual by first level by the brightness of control module control light that luminescence unit is exported is one second level, wherein, duty cycle be defined as at second o'clock apart from first o'clock distance and second o'clock ratio apart from sum.
The control method of the backlight module of present embodiment has described (as Fig. 2, Fig. 3 a to Fig. 3 i and shown in Figure 4) in detail in above-mentioned liquid crystal indicator 2, do not give unnecessary details in this appearance.
In sum, because of according to backlight module of the present invention, liquid crystal indicator and control method thereof be second o'clock apart from, the brightness of light is gradual by first level to be second level, in other words, the control method of the control method of backlight module of the present invention, backlight module, liquid crystal indicator and liquid crystal indicator is that the level of the brightness of the interior light of distance changes to reduce the generation of extra brightness by being controlled at not simultaneously, and need not change the duty cycle of light, not only can guarantee quality of display pictures, and can avoid reduce the serviceable life of backlight module.
The above only is an illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be included in the claim of the present invention its equivalent modifications of carrying out or change.

Claims (16)

1, a kind of backlight module comprises:
One luminescence unit; And
One control module, it is controlled this luminescence unit with a duty cycle and exports a light, wherein:
One first o'clock apart from, the brightness of this light is one first level,
One second o'clock apart from, the brightness of this light is gradual by this first level to be one second level, wherein, this duty cycle be defined as this second o'clock apart from this first o'clock apart from and this second o'clock ratio apart from sum.
2, backlight module as claimed in claim 1, wherein, this second o'clock apart from, the brightness of this light is gradual by this first level according to a relation to be this second level.
3, backlight module as claimed in claim 2, wherein, this brightness of this light is to be this second level with this relation of being inversely proportional to approximately with a liquid crystal reaction relation by this first level is gradual.
4, backlight module as claimed in claim 1, wherein, the product of the part of one the 3rd level and this second o'clock distance brightness summation that deducts this light in this part of this second o'clock distance the brightness summation that equals this light in another part of this second o'clock distance in fact deducts the product of this another part of the 3rd level and this second o'clock distance.
5, a kind of control method of backlight module, this backlight module have a control module and this luminescence unit, and this control module is controlled this luminescence unit with a duty cycle and exported a light, comprises:
One first o'clock apart from, the brightness of this light is one first level; And
One second o'clock apart from, the brightness of this light is gradual by this first level to be one second level, wherein, this duty cycle be defined as this second o'clock apart from this first o'clock apart from and this second o'clock ratio apart from sum.
6, the control method of backlight module as claimed in claim 5, wherein,
This second o'clock apart from, a brightness of this light is gradual for this second level by this first level according to a relation.
7, the control method of backlight module as claimed in claim 6, wherein,
This brightness of this light is to be this second level with this relation of being inversely proportional to approximately with a liquid crystal reaction relation by this first level is gradual.
8, the control method of backlight module as claimed in claim 5, wherein, the product of the part of one the 3rd level and this second o'clock distance brightness summation that deducts this light in this part of this second o'clock distance the brightness summation that equals this light in another part of this second o'clock distance in fact deducts the product of this another part of the 3rd level and this second o'clock distance.
9, a kind of liquid crystal indicator comprises:
One display panels; And
One backlight module has a luminescence unit and a control module, and this control module is controlled this luminescence unit with a duty cycle and exported a light to this display panels, wherein,
One first o'clock apart from, the brightness of this light is one first level,
One second o'clock apart from, the brightness of this light is gradual by this first level to be one second level, wherein, this duty cycle be defined as this second o'clock apart from this first o'clock apart from and this second o'clock ratio apart from sum.
10, liquid crystal indicator as claimed in claim 9, wherein, this second o'clock apart from, a brightness of this light is gradual by this first level according to a relation to be this second level.
11, liquid crystal indicator as claimed in claim 10, wherein
This brightness of this light is to be this second level with this relation of being inversely proportional to approximately with a liquid crystal reaction relation by this first level is gradual.
12, liquid crystal indicator as claimed in claim 9, wherein, the product of the part of one the 3rd level and this second o'clock distance deducts the brightness summation of this light in this part of this second o'clock distance, and the brightness summation that equals this light in another part of this second o'clock distance in fact deducts the product of this another part of the 3rd level and this second o'clock distance.
13, a kind of control method of liquid crystal indicator, this liquid crystal indicator has a display panels and a backlight module, this backlight module has a control module and this luminescence unit, this control module is controlled this luminescence unit with a duty cycle and is exported a light to this display panels, and control method comprises:
One first o'clock apart from, the brightness of this light is one first level; And
One second o'clock apart from, the brightness of this light is gradual by this first level to be one second level, wherein, this duty cycle be defined as this second o'clock apart from this first o'clock apart from and this second o'clock ratio apart from sum.
14, the control method of liquid crystal indicator as claimed in claim 13, wherein, this second o'clock apart from, a brightness of this light is gradual by this first level according to a relation to be this second level.
15, the control method of liquid crystal indicator as claimed in claim 14, wherein, this brightness of this light is to be this second level with this relation of being inversely proportional to approximately with a liquid crystal reaction relation by this first level is gradual.
16, the control method of liquid crystal indicator as claimed in claim 13, wherein, the product of the part of one the 3rd level and this second o'clock distance deducts the brightness summation of this light in this part of this second o'clock distance, and the brightness summation that equals this light in another part of this second o'clock distance in fact deducts the product of this another part of the 3rd level and this second o'clock distance.
CN2007101382126A 2007-07-31 2007-07-31 Backlight module, liquid crystal display and control method thereof Expired - Fee Related CN101359123B (en)

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CN103220478A (en) * 2013-04-24 2013-07-24 青岛海信电器股份有限公司 Display device and television

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US20070279541A1 (en) * 2005-06-29 2007-12-06 Nano Loa, Inc. Method of driving liquid crystal display device
CN100498911C (en) * 2005-10-14 2009-06-10 群康科技(深圳)有限公司 Driving method for liquid crystal display

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CN103220478A (en) * 2013-04-24 2013-07-24 青岛海信电器股份有限公司 Display device and television

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