CN201048437Y - Backlight brightness automatic regulation circuit and television set using the circuit - Google Patents
Backlight brightness automatic regulation circuit and television set using the circuit Download PDFInfo
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- CN201048437Y CN201048437Y CNU2007200233045U CN200720023304U CN201048437Y CN 201048437 Y CN201048437 Y CN 201048437Y CN U2007200233045 U CNU2007200233045 U CN U2007200233045U CN 200720023304 U CN200720023304 U CN 200720023304U CN 201048437 Y CN201048437 Y CN 201048437Y
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Abstract
The utility model discloses an automatic backlight brightness adjusting circuit and a television using the circuit which include a light sensing circuit and a main processor connected with the light sensing circuit. The light sensing circuit senses light in the outside circumstance, then creates corresponding testing signals according to the light intensity of the outside circumstance, and then outputs the signals to the main processor. The main processor creates corresponding brightness adjusting and controlling signals according to the received testing signals, and then sends the brightness adjusting and controlling signals to a backlight adjusting port of the circuit. The automatic backlight brightness adjusting circuit of the utility model has simple structure and low cost, can sense the light intensity of the outside circumstance automatically, and can adjust the backlight brightness of the display screen automatically according to the sensed light intensity of the outside circumstance. The utility model can avoid the tedious manual adjusting process, can ensure the adjusting effect to be more obvious, can perform double functions of eyes protection and energy conservation, and can facilitate lifting the quality of the whole machine of the television product.
Description
Technical field
The utility model belongs to the brightness regulating circuit technical field, specifically, relate to a kind of can be according to the adaptation control circuit of automatically regulating display backlight brightness a little less than the environmental light intensity.
Background technology
The image brightness of liquid crystal TV set depends on the brightness of backlight lamp tube, and this brightness generally can be different and different with producer according to the liquid crystal display screen size, and brightness is big more, and image is bright, and the electric weight that expends equally is just big more.But in fact when brightness of outside light was very big, too little some the details aspect that may cause of the brightness of liquid crystal display screen was unclear, at this time needs the brightness of liquid crystal display screen itself is improved; And when external environment light was dark, this moment, the brightness of liquid crystal display screen need reduce, because in this case, the too bright meeting of liquid crystal display screen feels very dazzling, was a kind of injuries to user's eyes, and can causes waste of electric energy.In addition, when external environment light was invariable, the brightness of input signal also can change along with the variation of scene, time, if at this time input signal is too bright, watch the user of TV also can feel very dazzling, at this time reduce backlight illumination and also be very important.Also reduce the power consumption of whole LCD TV when reducing liquid crystal display screen brightness, saved electric energy.
Existing method of regulating brightness of display screen is, or the user manually regulates voluntarily repeatedly reaching appropriate brightness, or switching the various luminance patterns that television set presets regulates; Wherein, if adopt the mode of manually regulating repeatedly to change brightness of display screen, its adjustment process is quite loaded down with trivial details; If the method for the various luminance patterns that employing switching television set presets is regulated, also may not adapt to the current environment of user, thereby also may not necessarily reach customer satisfaction system effect.
Therefore, press for a kind of circuit that can regulate the LCD TV backlight illumination according to environmental light brightness automatically of design.
The utility model content
The utility model is in order to solve loaded down with trivial details, the unfavorable problem of preset mode brightness adjusting method effect of backlight illumination manual adjustment method process in the prior art, a kind of novel backlight illumination regulating circuit is provided, can be according to the strong and weak backlight illumination of regulating display screen automatically of external environment light, need not manual operation, effect is remarkable.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of backlight illumination auto-adjusting circuit comprises photoinduction circuit and the primary processor that is attached thereto, described photoinduction circuit induction external environment light, and, export primary processor to according to quantizing generation relevant detection signal a little less than the environmental light intensity; Described primary processor generates corresponding brightness regulation control signal according to the detection signal that receives, and exports the adjusting port backlight of display circuit to.
Wherein, the detection signal output of described photoinduction circuit is its I
2The C bus port is converted into digital signal with ambient light intensity and passes through I
2The C bus connects described primary processor.
Further, described primary processor connects the adjusting port backlight of described display circuit by its PWM port, exports described brightness regulation control signal, the pulse signal that promptly has different duty.
Further again, described photoinduction circuit is an integrated photoinduction chip, its resistance passes through a reference resistance ground connection with reference to pin, provide with reference to resistance in order to analog to digital conversion circuit, to realize that detected external environment condition light intensity signal is converted to digital signal corresponding output to integrated photoinduction chip internal.
Further again, the power end of described integrated photoinduction chip connects power supply by the dividing potential drop branch road that is composed in series by a plurality of diodes, to mate the power supply current potential requirement of integrated photoinduction chip.
In conjunction with above-mentioned backlight illumination auto-adjusting circuit, the utility model provides a kind of television set with described backlight illumination auto-adjusting circuit again, be provided with primary processor and the photoinduction circuit that is connected with described primary processor in described television set inside, described photoinduction circuit induction external environment light, and according to quantizing output relevant detection signal a little less than the environmental light intensity; Described primary processor generates corresponding brightness regulation control signal according to the detection signal that receives, and exports the adjusting port backlight of display screen to.
Wherein, the main decoder chip that described primary processor can adopt existing inside in the television set to be integrated with CPU realizes, connects the adjusting port backlight of described display screen by its PWM port, exports described brightness regulation control signal.
Compared with prior art; advantage of the present utility model and good effect are: backlight illumination auto-adjusting circuit of the present utility model is simple in structure; with low cost; can respond to external environment light ambient light intensity strong and weak and that basis is sensed automatically and regulate the backlight illumination of display screen automatically; not only avoided the loaded down with trivial details of manual adjustments process; also make the regulating effect more remarkable, played the double action of vision protection, energy savings simultaneously, help the lifting of tv product complete machine quality.
Description of drawings
Fig. 1 is the general structure block diagram of the television set with backlight illumination auto-adjusting circuit that proposes of the utility model;
Fig. 2 is based on the circuit theory diagrams of the backlight illumination auto-adjusting circuit in the television set shown in Figure 1.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
With reference to figure 1, illustrate a kind of general structure that the utility model proposes with television set of automatic adjusting backlight illumination.As shown in Figure 1, comprise antenna 10, the tuner that is connected with this antenna 10 and in put and video detecting circuit unit 11, the video that is connected with this unit 11 amplifies and colour decoding circuit unit 12 and synchronous circuit 19, the R level amplifying circuit 13 that is connected with colour decoding circuit unit 12, G level amplifying circuit 14, B level amplifying circuit 15 and synchronous circuit 18, with amplifying circuit 13,14,15 sequential colorization sampling and the switch elements 16 that connect, sampling maintenance that is connected with unit 16 and signal driver unit 17, the display screen 21 that is connected with unit 17, be connected in the scanner driver 20 and the backlight illumination auto-adjusting circuit 22 of this display screen 21, the synchronous circuit 18 that is connected with this scanner driver 20, and the loud speaker 23 that is connected with described synchronous circuit 19.
Described television set is when work, select a certain channel signals from tuner antenna 10, be divided into two-way behind intermediate frequency amplification, video detection: one tunnel audio signal enters audio frequency and amplifies and treatment circuit, be the synchronous circuit 19 among Fig. 1, and then promote loud speaker 23 output sound accompaniments; Another road vision signal, entering video amplifies and colour decoding circuit 12, after video amplification and colour decoding processing, with red (R), green (G), blue (B) tristimulus signals are delivered to the colour signal sample circuit, and will go, field sync signal is sent into synchronous circuit 18, the line synchronizing signal SH that produces is admitted to scanner driver 20, the field sync signal SV that produces is admitted to colour signal sample circuit 16 with line synchronizing signal SH, demonstrate coloured image by display screen at last, display brightness auto-adjusting circuit 22 is adjusted the backlight illumination of display screen 21 in real time according to ambient light intensity.Above-mentioned television set can be CRT television set, plasma TV, and when being that the liquid crystal TV set effect is best, display screen is that the LCDs effect is best.
With reference to figure 2, illustrate structure based on the backlight illumination auto-adjusting circuit in the television set shown in Figure 1, comprise photoinduction circuit and connected primary processor CPU.Described photoinduction circuit can adopt an integrated photoinduction chip NR02 to realize that the integrated photoinduction chip of ISL29001 for example shown in Figure 2 can be responded to the visible light of 380nm～770nm, and luminous intensity can be changed into easy easy-to-use 15, I
2The output of C standardized digital signal.In described integrated photoinduction chip I SL29001 integrated current amplifier, be used to eliminate 50Hz/60Hz rejects trap and 15 A/D converter ADC of artificial optical flare.Integrated photoinduction chip I SL29001 has realized the highest sensitivity, can reach the sensitivity of human eye, and has a low-power consumption, its illumination range is a 0.3LUX (brill: the lux) to 10,000LUX (lux), the wavelength sensitivity of its spectral wavelength sensitivity and human eye (peak response of 550nm) is very approaching, has the spectral sensitivity characteristic curve that is complementary with human eye.
1 pin of described integrated photoinduction chip NR02 is its supply pin Vdd, connects power supply 5V_SB by the dividing potential drop branch road that is composed in series by a plurality of diodes, to mate the power supply current potential requirement of integrated photoinduction chip NR02.In the utility model, because the supply district of the supply pin Vdd of integrated photoinduction chip I SL29001 is between 2.7-3.3V, and the potential value of power supply 5V_SB is+5V, in order to mate the power demands of integrated photoinduction chip I SL29001, three diodes of need between the supply pin Vdd of power supply 5V_SB and integrated photoinduction chip I SL29001, connecting, two diodes among the double diode device D1 as shown in Figure 2 and a diode among the double diode device D12.Like this ,+5V power supply 5V_SB is under the effect of dividing potential drop diode D1, D12, and the operating voltage to the supply pin Vdd of integrated photoinduction chip I SL29001 exports 2.9V (5-1.7*3=2.9V) has satisfied its power demands.Certainly, the series connection number of described dividing potential drop diode also is not limited only to above-mentioned the giving an example in the utility model, the concrete power demands that should look integrated photoinduction chip power pin, and the concrete current potential situation of power supply is specifically set.Simultaneously, described dividing potential drop branch road also can adopt the resistance pressure-dividing network of being made up of a plurality of divider resistances to realize that the utility model is not limited thereto.In order to ensure to the stable direct current supply of described integrated photoinduction chip NR02 output, between the supply pin Vdd of described integrated photoinduction chip NR02 and ground, also be connected with two filter capacitor CR03, CR07 in parallel, with the wave interference of scurrying in the filtering circuit of making an uproar.
2 pin of described integrated photoinduction chip NR02 are grounding leg Vss, 3 pin are that resistance is with reference to pin Rext, by a reference resistance RR08 ground connection, provide with reference to resistance in order to analog to digital conversion circuit ADC to integrated photoinduction chip NR02 inside, the utility model is an example with 100K Ω, to realize that detected external environment condition light intensity signal is converted to digital signal corresponding output.5 pin of described integrated photoinduction chip NR02,6 pin are its I2C bus pin SCL, SDA, the I2C bus port that connects described primary processor CPU respectively by configuration resistance R R10, RR09, the corresponding digital signal that integrated photoinduction chip NR02 conversion is generated exports CPU to, to realize the effective adjusting of CPU to display backlight brightness.
In addition, in order to realize I
2The reliable transmission of C bus signals, the I between described integrated photoinduction chip NR02 and CPU
2Also be connected with on the C bus line by resistance R R12, RR13 and DC power supply VCC form on draw branch road, the perhaps dividing potential drop branch road of being made up of resistance R R11, RR12, RR13, RR14 and DC power supply VCC is to satisfy the transmission requirement of bus signals.
Relation between the brightness (L) of the external environment light that described integrated photoinduction chip NR02 senses and the numerical value (Data1) of its output is as follows:
Wherein, Rext=RR08=100K Ω.Can calculate the numerical value Data1 that integrated photoinduction chip NR02 exports from top equation, CPU passes through I
2The C bus reads this numerical value, be the brightness of current environment light, compare with the value that sets in advance in the program, and then change the frequency or the duty ratio of its PWM output waveform, adjusting port backlight by its PWM port connection display screen utilizes different waveforms to regulate the backlight illumination of display screen, when being used for LCDs, then in order to regulating the brightness of backlight lamp tube, and then realize effective adjusting of display screen display brightness.When watching environment brighter, the brightness of television image also improves thereupon, keeps image bright-coloured eye-catching with this like this; When ambient brightness was relatively lower, the brightness of television image also decreased, and makes picture soft not dazzling, and can effectively save electric energy.The brightness of input signal also is constantly to change on the other hand, when the brightness ratio of input signal bigger, the brightness that can suitably improve backlight lamp tube; When input signal was relatively darker, the brightness of reduction backlight lamp tube that can be suitable made picture soft not dazzling, and can save electric energy equally.
As another embodiment of the present utility model, the conditioning signal that need receive when the adjusting port backlight of display screen is not a pulse signal, but during analog voltage signal, need connect an integrating circuit in the PWM of described CPU port back, described integrating circuit is according to frequency and voltage signal of duty ratio output of described pwm control signal, for example PWM is that 300Hz and duty ratio are 50% o'clock, and the voltage behind the integration may be 1.5V; When the increase duty ratio was 80%, the voltage behind the integration may be exactly 2.3V, utilizes this voltage signal to regulate the backlight illumination of display screen at last.Certainly, in this case, also can directly adopt the wherein way mould of CPU to change the adjusting port backlight that the DAC port connects described display screen, directly export analog voltage signal, to realize automatic adjusting display backlight brightness with different potentials by CPU.
It is emphasized that, in the present embodiment, described integrated photoinduction chip NR02 can adopt model to realize for the ISL29002 integrated chip equally, also the photoinduction circuit that can be made up of discrete components and parts such as light-emitting diodes etc. adopts I between described integrated photoinduction chip NR02 and the primary processor CPU
2The communication of C bus mode can certainly adopt other any suitable communication modes to realize that the utility model is not limited thereto.
In order to realize the simple of circuit structure, the main decoder chip that described primary processor CPU can adopt existing inside on the television set decoding deck to be integrated with CPU is realized, can certainly adopt independent cpu chip to realize that the utility model does not specifically limit this.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1. backlight illumination auto-adjusting circuit is characterized in that: comprise photoinduction circuit and the primary processor that is attached thereto, and described photoinduction circuit induction external environment light, and generate the relevant detection signal according to quantizing a little less than the environmental light intensity, export primary processor to; Described primary processor generates corresponding brightness regulation control signal according to the detection signal that receives, and exports the adjusting port backlight of display circuit to.
2. backlight illumination auto-adjusting circuit according to claim 1 is characterized in that: the detection signal output of described photoinduction circuit is its I
2The C bus port is converted into digital signal with ambient light intensity and passes through I
2The C bus connects described primary processor.
3. backlight illumination auto-adjusting circuit according to claim 1 and 2 is characterized in that: described primary processor is exported described brightness regulation control signal by its PWM port.
4. backlight illumination auto-adjusting circuit according to claim 1 and 2 is characterized in that: described photoinduction circuit is an integrated photoinduction chip, and its resistance passes through a reference resistance ground connection with reference to pin.
5. backlight illumination auto-adjusting circuit according to claim 4 is characterized in that: the power end of described integrated photoinduction chip connects power supply by the dividing potential drop branch road that is composed in series by a plurality of diodes.
6. television set with backlight illumination auto-adjusting circuit, it is characterized in that: in described television set, be provided with a backlight illumination auto-adjusting circuit, the photoinduction circuit that in described regulating circuit, includes a primary processor and be connected with described primary processor, described photoinduction circuit induction external environment light, and, export primary processor to according to quantizing generation relevant detection signal a little less than the environmental light intensity; Described primary processor generates corresponding brightness regulation control signal according to the detection signal that receives, and exports the adjusting port backlight of display screen to.
7. television set according to claim 6 is characterized in that: the detection signal output of described photoinduction circuit is its I
2The C bus port is converted into digital signal with ambient light intensity and passes through I
2The C bus connects described primary processor.
8. according to claim 6 or 7 described television sets, it is characterized in that: described primary processor is the inner main decoder chip that is integrated with CPU in the television set, connect the adjusting port backlight of described display screen by its PWM port, export described brightness regulation control signal.
9. according to claim 6 or 7 described television sets, it is characterized in that: described photoinduction circuit is an integrated photoinduction chip, and its resistance passes through a reference resistance ground connection with reference to pin.
10. television set according to claim 9 is characterized in that: the power end of described integrated photoinduction chip connects power supply by the dividing potential drop branch road that is composed in series by a plurality of diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200233045U CN201048437Y (en) | 2007-06-06 | 2007-06-06 | Backlight brightness automatic regulation circuit and television set using the circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200233045U CN201048437Y (en) | 2007-06-06 | 2007-06-06 | Backlight brightness automatic regulation circuit and television set using the circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201048437Y true CN201048437Y (en) | 2008-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200233045U Expired - Fee Related CN201048437Y (en) | 2007-06-06 | 2007-06-06 | Backlight brightness automatic regulation circuit and television set using the circuit |
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| CN (1) | CN201048437Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630487A (en) * | 2008-07-17 | 2010-01-20 | 奇美电子股份有限公司 | Liquid crystal display and driving method |
| CN102231263A (en) * | 2011-07-11 | 2011-11-02 | 奇瑞汽车股份有限公司 | Automobile and system and method for regulating luminance of display screen |
| CN102522074A (en) * | 2011-12-29 | 2012-06-27 | 华为终端有限公司 | Method and device for controlling screen brightness and display equipment |
| CN103905754A (en) * | 2012-12-30 | 2014-07-02 | 青岛海尔软件有限公司 | Image automatic adjustment method based on RGB sensor |
| CN102098471B (en) * | 2009-12-11 | 2015-02-11 | 康佳集团股份有限公司 | Television energy saving device and control method |
-
2007
- 2007-06-06 CN CNU2007200233045U patent/CN201048437Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630487A (en) * | 2008-07-17 | 2010-01-20 | 奇美电子股份有限公司 | Liquid crystal display and driving method |
| CN102098471B (en) * | 2009-12-11 | 2015-02-11 | 康佳集团股份有限公司 | Television energy saving device and control method |
| CN102231263A (en) * | 2011-07-11 | 2011-11-02 | 奇瑞汽车股份有限公司 | Automobile and system and method for regulating luminance of display screen |
| CN102522074A (en) * | 2011-12-29 | 2012-06-27 | 华为终端有限公司 | Method and device for controlling screen brightness and display equipment |
| CN102522074B (en) * | 2011-12-29 | 2014-02-19 | 华为终端有限公司 | Method and device for controlling screen brightness and display equipment |
| CN103905754A (en) * | 2012-12-30 | 2014-07-02 | 青岛海尔软件有限公司 | Image automatic adjustment method based on RGB sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080416 Termination date: 20110606 |