CN101521974B - Light source for developing color by color sequential method - Google Patents
Light source for developing color by color sequential method Download PDFInfo
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- CN101521974B CN101521974B CN200910111421A CN200910111421A CN101521974B CN 101521974 B CN101521974 B CN 101521974B CN 200910111421 A CN200910111421 A CN 200910111421A CN 200910111421 A CN200910111421 A CN 200910111421A CN 101521974 B CN101521974 B CN 101521974B
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Abstract
The invention relates to a light source for developing color by a color sequential method, which controls the lightening time sequences of red, green and blue (RGB) and achieves the color to be develoThe invention relates to a light source for developing color by a color sequential method, which controls the lightening time sequences of red, green and blue (RGB) and achieves the color to be developed by vision persistence. The light source comprises a plurality of lightening areas and a color sequence control circuit, and the light sources of the lightening units of the lightening areas are prped by vision persistence. The light source comprises a plurality of lightening areas and a color sequence control circuit, and the light sources of the lightening units of the lightening areas are provided by red luminescence unit light sources, green luminescence unit light sources and blue luminescence unit light sources; the color sequence control circuit is electrically connected to the lightovided by red luminescence unit light sources, green luminescence unit light sources and blue luminescence unit light sources; the color sequence control circuit is electrically connected to the lightening areas and controls the color developing operation of the lightening display areas by the color sequential method. ening areas and controls the color developing operation of the lightening display areas by the color sequential method.
Description
Technical field
The present invention is the luminescence technology of relevant a kind of display, particularly about the light source with the colour developing of look preface method.
Background technology
Along with development in Hi-Tech, video product such as digitized video signal or device for image, is to have become general on the market consumer products.Popular based on the maturation of liquid crystal panel industry and price, above-mentioned video signal or device for image mostly adopt LCD device at present, so it becomes a significant components, the user can read required information by LCD device.Typical liquid crystal (LCD) comprises subtend substrate with shared electrode and chromatic filter layer (color filter), has thin film transistor (TFT) array (thin film transistor array; TFT array) thin film transistor base plate of substrate and plurality of electrodes, and Jie places liquid crystal layer therebetween (liquid crystal layer).Apply a voltage to pixel electrode and shared electrode, voltage difference therebetween can produce electric field.Utilize the electric field variability can change the sensing of the liquid crystal molecule in the liquid crystal layer, thereby change light transmission through liquid crystal layer.By the voltage difference between adjustment pixel electrode and the shared electrode, LCD can demonstrate desire image.
Comprise a substrate, a plurality of color filter patterns, black matrix and transparent electrode layer in the convention subtend substrate.Color filter patterns is to be disposed on its substrate, and corresponding with the picture element zone of plurality of groups of substrates of thin-film transistor, and is to separate with black matrix between each color filter patterns.Be coated with transparent electrode layer on color filter patterns and the black matrix.
United States Patent (USP) the 6th, 744 also discloses a kind of look-up table (Look Up Table method) that is applied to display No. 443, and the framework of its display comprises table look-up (LUT), digital analog converter, controller, timer (timer).Through loading the corresponding data of tabling look-up, display can be regulated inner color balance automatically, and the effect of equal under all conditions ability true reappearance white is to provide the white balance function.The type of drive of this kind display is comparatively simple, and is identical with the type of drive that generally adds drive IC, but producing full-color image still need see through colored filter (color filter), and cost does not reduce.
The device that above-mentioned known techniques disclosed all need utilize colored filter to produce chromatic image, and manufacturing cost is higher.
Summary of the invention
Based on above-mentioned, the objective of the invention is to be to provide a kind of light source that is used for the look preface method control colour developing of display, need not use colored filter.
The present invention discloses a kind of light source with the colour developing of look preface method, comprises: a plurality of light-emitting zones; A plurality of luminescence units are coupled to a plurality of light-emitting zones, to provide a plurality of light-emitting zones required light; And sequence control circuit of the same colour, be electrically connected to a plurality of light-emitting zones, control the colour developing of a plurality of light-emitting zones with look preface method.
The present invention also discloses a kind of light source with the colour developing of look preface method, comprises: a plurality of light-emitting zones; A plurality of luminescence units are coupled to a plurality of light-emitting zones, to provide a plurality of light-emitting zones required light; Sequence control circuit of the same colour is electrically connected to a plurality of light-emitting zones, controls the colour developing of a plurality of light-emitting zones with look preface method; And an electric charge recycling circuit, be connected to a plurality of luminescence units, when a plurality of luminescence units were converted to red luminescence unit action by green or blue luminescence unit, electric charge recycling circuit stored the potential difference (PD) that second voltage subtracts first voltage, exports first voltage quasi position.
Wherein above-mentioned each light-emitting zone comprises: a dicyclo pwm control circuit is connected to electric charge recycling circuit; One booster circuit is connected to a plurality of luminescence unit positive poles and dicyclo pwm control circuit, so that one first voltage or one second magnitude of voltage to a plurality of luminescence units to be provided; And a potential shift circuit, with magnitude of voltage of the voltage shift that inputs to the potential shift circuit (shift) to another accurate position to provide to booster circuit.
The operating voltage that can make red luminescence unit is first voltage, and operating voltage green or blue luminescence unit is second voltage; Wherein first voltage is less than second voltage.
When a plurality of luminescence units of light-emitting zone were converted to red luminescence unit action by green or blue luminescence unit, electric charge recycling circuit stored the potential difference (PD) that second voltage subtracts first voltage, exports first voltage quasi position.
Above-mentioned look sequence control circuit comprises a counter (counter); One offset buffer (shift register) is connected to counter; One control signal pattern (pattern) unit is connected to counter and offset buffer, controls signal to current balance circuit to provide; And a voltage switch unit, be connected to counter, with switched voltage.
The light source that is used for the look preface method colour developing of display of the present invention; Utilize look preface method sequential control red, green, blue color picture to stay in the time of display; Present full-color image by the persistence of vision colour mixture, needn't use colored filter, reduced the production cost of display.
The present invention realizes the control of look preface method with the hardware controls mode, can digital signal be integrated among single the IC, and its circuit framework is simple, can directly see through and revise control signal pattern (pattern), reaches the colour developing order of implementing look preface method.
Moreover the light source of look preface method of the present invention has electric charge recycling circuit, when switching red or green, blue light source, switched voltage is provided, with the duration of charging of effective shortening booster circuit, and the accelerating potential switch speed.
Description of drawings
Said modules, and further feature of the present invention and advantage, by the content of reading embodiment and graphic after, will be more obvious:
First figure is according to preferred embodiment of the present invention, is the synoptic diagram with the light source of look preface method colour developing.
Second figure is the circuit diagram of current balance circuit according to preferred embodiment of the present invention.
The 3rd figure is the calcspar of look sequence control circuit according to preferred embodiment of the present invention.
The 4th figure is the constitutional diagram of operating with the light source of look preface method colour developing according to preferred embodiment of the present invention.
Primary clustering symbol description in the accompanying drawing:
100 light sources
The 102a light-emitting zone
The 102b light-emitting zone
The 102c light-emitting zone
104 look sequence control circuits
108 booster circuits
110 ring pwm control circuits
112 potential shift circuit
114 luminescence units
116 current balance circuits
118 electric charge recycling circuits
302 counters
304 offset buffers
306 voltage switch units
308 control signal pattern unit
Embodiment
The present invention will cooperate its preferred embodiment and accompanying graphic being specified in down.Should understand, the preferred embodiment among the present invention is only in order to explanation, but not in order to limit the present invention.In addition, the preferred embodiment in literary composition, the present invention also can be widely used in other embodiment, and the present invention is not limited to any embodiment, and should look the described scope of claim and decide.
Run through " embodiment (the one embodiment) " or " embodiment (a embodiment) " of this instructions, it means a specific characteristic, structure or the characteristic of description about preferred embodiment, and comprises at least one preferred embodiment of the present invention.Therefore, in the phrase that occurs everywhere of present disclosure in " among the embodiment (in one embodiment) " or " in embodiment (in aembodiment) ", the identical embodiment of reference fully.Moreover its specific characteristic, structure or characteristic can any suitable mode be incorporated in one or more preferred embodiments.
The present invention discloses a kind of display by the colour developing of look preface method.The present invention utilizes look preface method (color sequential); See through the time that sequential control red, green, blue color picture stays in display; By persistence of vision; On the retina in the retentivity time of eye colour mixture and present full-color image, needn't use colored filter, reduced the production cost of display.Moreover electric charge recycling circuit of the present invention when switching red or green, blue light source, provides extra switched voltage, effectively shortens the duration of charging of booster circuit, the accelerating potential switch speed.
With reference to first figure,, be depicted as light source 100 synoptic diagram with the colour developing of look preface method according to embodiments of the invention.Light source 100 is made up of a plurality of light- emitting zone 102a, 102b and 102c.Look sequence control circuit 104 is coupled to each light- emitting zone 102a, 102b or 102c, is beneficial to look sequence control circuit 104 and utilizes look preface method to determine the time sequential routine of a plurality of light-emitting zones, and control the colour developing of a plurality of light- emitting zone 102a, 102b, 102c.
Each light- emitting zone 102a, 102b or 102c individually have booster circuit (boost circuit) 108, dicyclo (dualloop) PWM (Pulse Width Modulation) control circuit 110, potential shift (level shift) circuit 112, luminescence unit 114, current balance circuit 116 and electric charge recycling circuit 118.
Present embodiment will be a description object with light-emitting zone 102a, and each light-emitting zone in the right light source 100 is all identical configuration, so the part that relevant light- emitting zone 102b and 102c repeat will repeat no more.Please earlier with reference to light-emitting zone 102a, luminescence unit 114 is by red R
1, green G
1And blue B
1Three kinds of luminescence units are formed, to constitute light source 100.In preferred embodiment, its red R
1, green G
1Or blue B
1Luminescence unit can be red, green or blue light emitting diode (light emitting diode, LED).Luminescence unit 114 is by red R
1, green G
1, blue B
1Light emitting diode series connection path is formed.
Dicyclo pwm control circuit 110 provides input voltage to booster circuit 108.Can be by the input voltage of control booster circuit 108, the power transistor ON time length in the adjustment booster circuit 108, and then the inductance in the decision booster circuit 108 discharges and recharges the time.
Dicyclo pwm control circuit 110 has overcurrent mode and normal mode.In overcurrent mode, it avoids the inductive current of booster circuit 108 excessive, causes inductance saturated, and then dicyclo pwm control circuit 110 produces the current limliting signal, closes power transistor.In normal mode, dicyclo pwm control circuit 110 will pull feedback signal and feed-forward signal is made current ratio, and the trimming inductance electric current makes it become constant, and produces pulse wave width modulation signal accurately.
Control sluice (AND
1, AND
2And AND
3) input end PWM and EN receive control signal, control the operation in above-mentioned light emitting diode series connection path.Input end EN is " enable " signal, control light emitting diode series connection path conducting or close; Input end PWM is then in order to the ON time in path of control light emitting diode.
When input signal " 1 " to input end EN
1And PWM
1Conducting (On) to receive control signal, then triggers transmission lock TG
1Conducting, electric current I
1Then can be supplied to switch M
1Gate, make switch M
1Conducting, so light-emitting diodes canal path R
1Conducting and luminous.Can see through the signal that control inputs to PWM, the ON time of adjustment light-emitting diodes canal path.
Get back to first figure, electric charge recycling circuit 118 is connected to potential shift circuit 112 and red R
1, green G
1, blue B
1The positive pole of luminescence unit.Electric charge recycling circuit 118 can store the first voltage V
1With the second voltage V
2Between switched voltage.If when changeing low-voltage by high voltage, unnecessary electric charge will be stored in the electric capacity of electric charge recycling circuit 118; When if low pressure is changeed high pressure, then electric charge recycling circuit 118 is released into output terminal V with the electric charge that stores
Out, shortened duration of charging of booster circuit 108.
When the luminescence unit 114 of light-emitting zone 102a by green G
1Or blue B
1The light-emitting diodes canal path convert red R to
1Light-emitting diodes canal path when action, electric charge recycling circuit 118 will store switched voltage, to keep the first voltage V
1Accurate position.When the luminescence unit 114 of light-emitting zone 102a by red R
1The light-emitting diodes canal path convert green G to
1Or blue B
1Path when action, electric charge recycling circuit 118 can be with stored voltage add-back output terminal V
Out, make luminescence unit 114 can keep the second voltage V
2Accurate position.
Please,, be the calcspar of control circuit 104 according to preferred embodiment of the present invention with reference to the 3rd figure.Control circuit 104 comprises counter (counter) 302, offset buffer (shift register) 304, voltage switch unit 306 and control signal pattern (pattern) unit 308.
The input signal of control circuit 104 comprises reset signal (Reset), initial pulse wave signal (STV) and frequency signal (CPV).The purpose of reset signal is to remove the viewing area picture.The output signal comprises the first control signal S
1With the second control signal S
218 output terminals of control signal pattern unit 308 provide the first control signal S
1To current balance circuit 116.The first control signal S
1Via digital analog converter (DAC) coding, PWM and EN end to current balance circuit 116 are provided.18 output terminal mean allocation are given the current balance circuit 116 of light-emitting zone 102a, 102b and 102c, with the viewing area operation of control light source 100.The definition of its first control signal is shown in table one.
Table one
The P1-P9 representative inputs to the pwm signal of the circuit balancing circuit 116 in the light-emitting zone 102a-102c.The E1-E9 representative inputs to the EN signal of circuit balancing circuit 116.P1-P3 and E1-E3 correspond to light-emitting zone 102a; P4-P6 and E4-E6 correspond to light-emitting zone 102b; P7-P9 and E7-E9 correspond to light-emitting zone 102c.
If pwm signal is X, the EN signal is 0 (electronegative potential), does not then allow luminescence unit action (expression viewing area picture black frame insertion (Black Frame Insertion) scans); If pwm signal is On (representing green/blue periodic signal), the EN signal also is 1, and representative shows blueness or green emitting unit; If pwm signal is Off (periodic signal of representing red luminescence unit), the EN signal is 1, represents the exhibit red luminescence unit.
For example, as first state (KBB), three viewing areas present black (K), blueness, blue in regular turn respectively, so light-emitting zone 102a is failure to actuate, promptly the viewing area picture presents black (black plug).It is 1 that light-emitting zone 102b only has P6 and E6 signal, and expression shows the blue-light-emitting unit.It is 1 that light-emitting zone 102c only has P9 and E9 signal, and also representative shows the blue-light-emitting unit.
The 5th state (GKR) and for example, light-emitting zone 102a-c shows green, black and redness in regular turn.It is 1 that light-emitting zone 102a only has P2, E2 signal, so its picture shows green; Light-emitting zone 102b does not have actuating signal, so its picture shows black; Light-emitting zone 102c only P7 is 0, and E7 is 1, so its picture exhibit red.Other state can the rest may be inferred, repeats no more.
Voltage switch unit 306 has three output terminals, and the second control signal S is provided
2To electric charge recycling circuit 118, for the first voltage V
1With the second voltage V
2The switching signal, shown in table two.
| Status | R 1G 1B 1 | R 2G 2B 2 | R 3G 3B 3 |
| (1) KBB | V 1 | V 2 | V 2 |
| (2) RKB | V 1 | V 1 | V 1 |
| (3) RRK | V 1 | V 1 | V 2 |
| (4) KRR | V 1 | V 1 | V 1 |
| (5) GKR | V 2 | V 1 | V 1 |
| (6) GGK | V 2 | V 2 | V 1 |
| (7) KGG | V 1 | V 2 | V 2 |
| (8) BKG | V 2 | V 1 | V 2 |
| (9) BBK | V 2 | V 2 | V 1 |
Table two
Because of the light emitting diode of red, green, blue, three kinds of different light emitting diodes only need be used two kinds of operating voltages and do and distinguish, so only define the first voltage V
1With the second voltage V
2When the operating voltage of red light-emitting diode is the first voltage V
1Operating voltage green or blue light diode is the second voltage V
2If when the viewing area is the black plug pattern, the first voltage V can be provided arbitrarily
1Or the second voltage V
2Because be in the viewing area of black plug pattern, its light source can be interdicted, and picture only shows black, so free voltage can apply it.
Following light source 100 operating processes please refer to the constitutional diagram of the 4th figure.At first transmit reset signal to control circuit 104, to remove the picture of viewing area.Transmit initial pulse wave signal (STV) subsequently to control circuit 104, control signal pattern unit 308 begins to transmit the first stroke state KBB data.Voltage switch unit 306 transmit corresponding first state magnitude of voltage control signal to electric charge recycling circuit 118.Counter 302 can be to the frequency signal totalling, if exploration on display resolution ratio is 768*1400, then each viewing area tale number of times is 256.When counter 302 totalling counts equaled 256,308 of control signal pattern unit were seen the second pen state data (RKB) off, and voltage switch unit 306 also can upgrade the operating voltage level of electric charge recycling circuit at this moment.After taking turns the third state (RRK), this moment is transmitted start signal in complete scanned in regular turn three viewing areas of black plug program; Transmitting the 4th pen state data (KRR), the rest may be inferred for step thereafter, after nine states were all taken turns once; Wait for reset signal removing picture, again circulation again.
The present invention utilizes look preface method sequential control red, green, blue color picture to stay in the time of display; Mode by persistence of vision; See through the persistence of vision colour mixture and present full-color image, have the following points advantage: colored filter needn't be used in (1), has reduced the production cost of display.(2) utilize display of the present invention must not use colored filter can promote light transmittance.(3) the present invention dynamically adjusts voltage, so can reduce drive circuit power consumption.The display of tradition chromatic colour optical filter must be formed a picture element by three sub-picture elements of red, green, blue, and the display that therefore exploration on display resolution ratio of the present invention will be more traditional is higher.(4) the present invention uses red, green and blue light emitting diode backlight as display, so can promote the colors of image saturation degree.
In addition, the present invention has electric charge recycling circuit, when switching red or green, blue light source, switched voltage is provided, with the duration of charging of effective shortening booster circuit, and the accelerating potential switch speed.
The present invention explains as above that with preferred embodiment so it is not in order to limit the patent right scope that the present invention advocated.Its scope of patent protection when look the claim scope and etc. same domain and deciding.All art of being familiar with this field, in not breaking away from this patent spirit or scope, change of being done or retouching all belong to the equivalence of being accomplished under the disclosed spirit and change or design, and should be included in the claim scope.
Claims (2)
1. light source with look preface method colour developing comprises:
A plurality of light-emitting zones;
A plurality of luminescence units are coupled to each in these a plurality of light-emitting zones, to provide these a plurality of light-emitting zones required light;
Sequence control circuit of the same colour is electrically connected to this a plurality of light-emitting zones, with the colour developing of these a plurality of light-emitting zones of look preface method control; And
One electric charge recycling circuit is connected to this a plurality of luminescence units, and when these a plurality of luminescence units converted red luminescence unit to by green or blue luminescence unit, this electric charge recycling circuit stored the potential difference (PD) that second voltage subtracts first voltage, exported one first voltage quasi position;
Wherein the operating voltage of this red luminescence unit is this first voltage, and this operating voltage green or blue luminescence unit is this second voltage;
Wherein this first voltage is less than this second voltage;
Wherein when these a plurality of luminescence units convert the action of green or blue luminescence unit to by red luminescence unit; This electric charge recycling circuit will discharge potential difference (PD) and voltage to these a plurality of luminescence units will be provided, and use making these a plurality of luminescence units can keep one second voltage quasi position;
Wherein this light-emitting zone comprises:
One dicyclo pwm control circuit, it is anodal to be connected to these a plurality of luminescence units;
One booster circuit, it is anodal to be connected to these a plurality of luminescence units, so that this first voltage or this second voltage to these a plurality of luminescence units to be provided;
One potential shift circuit, with magnitude of voltage of the voltage shift that inputs to this potential shift circuit to another accurate position to provide to this booster circuit; And
One current balance circuit is connected to these a plurality of luminescence unit negative poles and this look sequence control circuit, uses being supplied to this red, green or blue luminescence unit, can keep current balance type, makes the reduction current error;
Wherein this look sequence control circuit comprises:
One counter;
One offset buffer is connected to this counter;
One control signal pattern unit is connected to this counter and this offset buffer, controls signal to this current balance circuit to provide; And
One voltage switch unit is connected to this counter, so that the switching signal of this first voltage and this second voltage to be provided.
2. the light source with the colour developing of look preface method according to claim 1, it is characterized in that: wherein these a plurality of luminescence units comprise light emitting diode.
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|---|---|---|---|
| CN200910111421A CN101521974B (en) | 2009-04-07 | 2009-04-07 | Light source for developing color by color sequential method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910111421A CN101521974B (en) | 2009-04-07 | 2009-04-07 | Light source for developing color by color sequential method |
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| CN101521974B true CN101521974B (en) | 2012-09-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI496507B (en) * | 2014-05-20 | 2015-08-11 | Maintech Semiconductor Inc | Led circuit and driving method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI606749B (en) * | 2016-12-22 | 2017-11-21 | 華擎科技股份有限公司 | Light emission control circuit and mother board having the same |
-
2009
- 2009-04-07 CN CN200910111421A patent/CN101521974B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 刘玉 等."透视型液晶头盔显示器时序双原色显示".《光电工程》.2000,第27卷(第2期),第5-8页. |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI496507B (en) * | 2014-05-20 | 2015-08-11 | Maintech Semiconductor Inc | Led circuit and driving method thereof |
| US9949332B2 (en) | 2014-05-20 | 2018-04-17 | Maintech Semiconductor Inc. | LED circuit and driving method thereof |
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| Publication number | Publication date |
|---|---|
| CN101521974A (en) | 2009-09-02 |
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