CN1794044A - Liquid crystal display capable of automatic regulating brightness and its regulating method - Google Patents

Liquid crystal display capable of automatic regulating brightness and its regulating method Download PDF

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Publication number
CN1794044A
CN1794044A CN 200510022678 CN200510022678A CN1794044A CN 1794044 A CN1794044 A CN 1794044A CN 200510022678 CN200510022678 CN 200510022678 CN 200510022678 A CN200510022678 A CN 200510022678A CN 1794044 A CN1794044 A CN 1794044A
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China
Prior art keywords
brightness
microprocessor
module
signal
circuit
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Pending
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CN 200510022678
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Chinese (zh)
Inventor
郭强
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LG Electronics Nanjing Display Co Ltd
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LG Electronics Nanjing Display Co Ltd
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Priority to CN 200510022678 priority Critical patent/CN1794044A/en
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Abstract

A method for automatically regulating brightness of liquid crystal display includes adding brightness collection module and brightness feedback module in addition to original microprocessor control module and brightness regulation module, using microprocessor to compare environmental brightness signal to preset value and to regulate display backlight source to be brightness of preset value according to comparison result output control signal, then using backlight source sampling signal collected by brightness feedback module to carry out feedback control.

Description

Liquid crystal display capable of automatic regulating brightness and its regulating method
One, technical field
The present invention relates to a kind of LCD, a kind of specifically liquid crystal display capable of automatic regulating brightness and its regulating method.
Two, background technology
LCD is to open by " blocking-up " or " with tiny liquid crystal particle evenly distributed on the screen that " light reaches the purpose of going back original picture, because liquid crystal material itself is not luminous, so all be provided with fluorescent tube on the display screen both sides, be used to provide background illumination as light source.In using the LCD process, people's eyes are responsive to the brightness ratio of display environment, and especially the sudden change of brightness can produce harmful effect to people's vision, and this is particularly important for the user who uses notebook computer.For reaching the visual effect of the most comfortable, people need the variation of brightness to conform of regulator solution crystal display.Existing LCD brightness is for fixedly installing, the user adjusts brightness need carry out manual adjustments, very inconvenience, particularly for the user who uses notebook computer on the road, the variation that does not stop because of ambient brightness, in order to reach result of use preferably, must regulate LCD brightness frequently.
Three, summary of the invention
1, goal of the invention: the objective of the invention is in order to address the above problem, a kind of LCD of regulating brightness along with the variation of environment for use automatically is provided, improved user's euphorosia degree, the present invention also provides the control method of this LCD.
2, technical scheme: in order to reach described purpose, the invention provides a kind of liquid crystal display capable of automatic regulating brightness, comprise microprocessor control module and coupled brightness regulation module,
Described microprocessor control module comprises that one is accepted instruction and the output control signal is given the microprocessor of brightness regulation module, and be connected with microprocessor be used for preserving the ROM (read-only memory) that the user is provided with parameter;
Described brightness regulation module comprises a converse device that is connected with microprocessor, and the backlight of LCD regulating circuit that is connected with converse device;
It is characterized in that: it also is provided with brightness acquisition module and brightness feedback module,
Described brightness acquisition module comprises an optical sensor and the operational amplifier that is connected with optical sensor, the output terminal of operational amplifier connects microprocessor, optical sensor is used to gather the ambient brightness data, light signal is converted into current signal, the current signal of output is through the amplification of operational amplifier, change voltage signal and input microprocessor into, microprocessor with this voltage signal and preset value relatively and export control signal;
Described brightness feedback module comprises the sample circuit that is connected with the backlight regulating circuit, and the output terminal of sample circuit connects microprocessor and converse device, and this sample circuit is sent to microprocessor to carry out feedback regulation with the backlight sampled signal.
Needs for different user, this LCD also provides manual brightness regulating apparatus, a control panel that is used for user's manual adjustments that links to each other with microprocessor is set in the microprocessor control module of display, also be provided with an on-off circuit between microprocessor control module and brightness acquisition module, this on-off circuit is used to cut out the brightness acquisition module when control panel is worked.
The present invention also provides a kind of method that can regulate LCD brightness automatically, and this method comprises the following steps:
(1) gathers the ambient brightness data;
(2) brightness data is handled;
(3) luminance data values and the preset value after will handling compares, if result relatively is for being, then to step (7); If result relatively is for not, then to next step;
(4) output brightness control signal;
(5) regulate LCD brightness;
(6) brightness value and preset value are compared, if result relatively is for being, then to next step, if result relatively then returns step (4) for not;
(7) preserve Set For Current.
3, beneficial effect: the present invention compared with prior art, its remarkable advantage is: (1) brightness of automatic fine tuning LCD along with the variation of environment for use, make display intelligent more and greatly made things convenient for the user, slowed down user's visual fatigue simultaneously, improved its euphorosia degree; (2) automatically the setting of regulatory function do not influence the user function manually is set; (3) with low cost, it has carried out less improvement on original display brightness regulating circuit, increased the brightness acquisition module, and the brightness feedback module is exactly the sample circuit of the setting in the backlight of LCD regulating circuit, has promptly reached result of use preferably by less improvement; (4) because of available circuit is changed the less transformation that is suitable for available liquid crystal display production line; (5) when having improved visual effect, also can reduce the unnecessary power consumption of display, prolonging lamp tube service life, environmental protection more.
Four, description of drawings
Fig. 1 is the structured flowchart of liquid crystal display capable of automatic regulating brightness among the present invention;
Among Fig. 1: 1-microprocessor control module, 2-brightness regulation module, 3-brightness acquisition module, 4-brightness feedback module;
Fig. 2 can regulate the process flow diagram of the method for LCD brightness among the present invention automatically;
Fig. 3 is that fluorescent tube is the circuit diagram of the embodiment of cascaded structure in the backlight regulating circuit;
Fig. 4 is that fluorescent tube is the circuit diagram of the embodiment of parallel-connection structure in the backlight regulating circuit.
Among Fig. 3, Fig. 4: 11-microprocessor, 12-storer, 13-control panel, the 14-on-off circuit, the converse device of 21-, 31-optical sensor, the 32-operational amplifier, 41-current sampling circuit, E1, E2-power supply, R1, R2, Rn1, Rn2-resistance, the TR1-triode, T1, Tn-transformer, Ln1, Ln2-fluorescent tube, Dn1, Dn2, Dz-diode, Cn-electric capacity.
Five, embodiment
As shown in Figure 1, the invention provides a kind of liquid crystal display capable of automatic regulating brightness, comprise microprocessor control module 1, brightness regulation module 2, brightness acquisition module 3 and brightness feedback module 4,
Microprocessor control module 1 comprises that one is accepted instruction and exports the microprocessor 11 that control signal is given the brightness regulation module, and be connected with microprocessor 11 be used for preserving the ROM (read-only memory) 12 that the user is provided with parameter, for manual this module of control also comprises a control panel 13 that links to each other with microprocessor 11;
Brightness regulation module 2 comprises a converse device 21 that is connected with microprocessor 11 and the backlight of LCD regulating circuit 22 that is connected with converse device 21;
Brightness acquisition module 3 comprises an optical sensor 31 and the operational amplifier 32 that is connected with optical sensor 31, optical sensor 31 is used to gather the ambient brightness data, light signal is converted into current signal, the current signal of output is through the amplification of operational amplifier 32, change voltage signal and input microprocessor 11 into, microprocessor 11 compares this voltage signal and preset value, and regulates display brightness according to comparative result output control signal; Be provided with an on-off circuit 14 between microprocessor control module 1 and brightness acquisition module 3, described on-off circuit 14 is used to cut out brightness acquisition module 3 when control panel 13 work;
Brightness feedback module 4 comprises the sample circuit 41 that is connected with backlight regulating circuit 22, and this sample circuit 41 is sent to microprocessor 11 with sampled signal feedback, compares with the voltage signal of brightness acquisition module 3 input microprocessors 11.
Describe the workflow that the present invention regulates LCD brightness in detail in conjunction with Fig. 1 Fig. 2.When the start of LCD energized, at first microprocessor 11 presets initial value for the display interior brightness regulating circuit, promptly set the initialization state, then restart if initialization is unsuccessful, if finish initialization and system default automatic brightness adjustment function is opened, then open the automatic brightness adjustment function, on-off circuit 14 connections this moment, 3 work of brightness acquisition module, optical sensor 31 is started working and is accepted ambient light signal, again light signal is converted into current signal, and the current signal of output is through the amplification of operational amplifier 32, change voltage signal into, utilize formula Vout=Iout * R can calculate the size (step 1-2) of feedback voltage.If system default automatic brightness adjustment function is closed during start, then microprocessor 11 gauge tap circuit 14 are closed, and brightness this moment acquisition module 3 is not worked, and then finish by the button on the manual directly regulation control plate 13 if the user need adjust display brightness.
Operational amplifier 32 is with voltage signal input microprocessor 11, and microprocessor 11 compares this voltage signal and preset value, if the ratio that both ratios equal to set, microprocessor 11 will not exported brightness control signal, promptly keep present state.If both ratios are not equal to the value of setting, microprocessor 11 will be exported brightness control signal (step 3-4).
Converse device 21 and the backlight regulating circuit 22 of brightness control signal in brightness regulation module 2 regulated the lamp tube current value, thereby change the brightness (step 5) of display backlight fluorescent tube, simultaneously, the feedback signal of sample circuit also is connected in converse device 21, keeps the stable of the current value that sets.
Brightness feedback module 4 comprises sample circuit 41, and its current signal feedback of gathering backlight regulating circuit 22 is sent to microprocessor 11 and is used for FEEDBACK CONTROL (step 6).
May need repeatedly to repeat above-mentioned steps (step 4-6) this moment, finally reaches setting value, and the value that will configure is kept in the microprocessor 11, finishes whole self-regulating process (step 7).
As Fig. 3 circuit diagram shown in Figure 4, backlight of LCD regulating circuit 22 comprises transformer and CCFL fluorescent tube, at present it has two kinds of fluorescent tube connected modes, i.e. fluorescent tube series system (Fig. 3) and fluorescent tube parallel way (Fig. 4), and this dual mode is the basic mode of driving backlight.For the fluorescent tube series system is that a transformer drives two fluorescent tubes, and along with the increase of fluorescent tube number, the transformer number can extend to Tn by T1.Can drive 1 to n fluorescent tube (concrete quantity depends on the parameter specification of transformer) for transformer of fluorescent tube parallel way, and transformer also can extend to Tn by T1.Transformer all connects with parallel way in two kinds of connected modes.
Microprocessor 11 is in the core of control, it provides electric power by power supply E1, microprocessor 11 will be analyzed the outer signals of gathering, and output control, the single-chip microcomputer that it can be selected based on 8031 to 8051 cores has analog to digital conversion more than needed (A/D) interface to get final product for light sensory feedback and current feedback use.Storer 12 links to each other with microprocessor 11 respectively with control panel 13, and control panel 13 is used for user's manual operation interface, and storer 12 is electric erasable read only storer, and its space is used for preserving the parameter of user's setting and the value of setting of automatic photoinduction.The output of optical sensor 31 inserts the reverse input end of operational amplifier 32, its output terminal links to each other with microprocessor 11, between optical sensor 31 and microprocessor 11, also be provided with an on-off circuit 14, on-off circuit 14 constitutes a logic switch by resistance R 1 and triode TR1, and the work that microprocessor 11 is controlled optical sensor 31 by this on-off circuit 14 whether.Converse device 21 links to each other with the control signal output ends of microprocessor 11, converse device 21 is used for direct current signal is transformed into AC signal and inserts backlight regulating circuit 22, transformer in the backlight regulating circuit 22 can come CCFL lamp tube current in the regulating circuit according to the size of brightness control signal, and holding current is stable.Converse device 21 output terminals connect transformer T1 elementary to Tn respectively, and transformer secondary output is two the CCFL fluorescent tube Ln1 and the fluorescent tube Ln2 of series connection for Fig. 3 (the n group transformer with Fig. 3 is an example), afterwards each fluorescent tube current sampling circuit 41 of connecting respectively; For Fig. 4 (the n group transformer with Fig. 4 is an example) is two CCFL fluorescent tube Ln1 in parallel and Ln2, connects a sample circuit 41 after the parallel connection again.Sample circuit 41 (the n group transformer with Fig. 4 is an example) comprises diode Dn1, Dn2, Dz and resistance R n1, Rn2 and capacitor C n, and diode Dn1 negative electrode meets two divider resistance Rn1 and Rn2, diode Dn2 plus earth.Because the light tube electric voltage waveform is near just profound ripple, make the positive half cycle of waveform pass through Dn1, negative half period is through the clamper of Dn2, will obtain a half-wave, half-wave passes through the dividing potential drop of resistance R n1 and resistance R n2 and the filtering of capacitor C n again, will obtain more level and smooth current sampling signal, with the taking-up in parallel of each road current sampling signal, one the tunnel feeds back to converse device 21, another road feeds back to analog to digital conversion (A/D) interface of microprocessor 11 through diode Dz, and wherein diode Dz is used for distinguishing the two-way current sampling signal.
During use, user's energized, system carries out initialization, and system can give tacit consent to inducing function and close or open.If default conditions are closed condition, the button that then needs the user to press control panel 13 is opened.If default conditions are opening, optical sensor 31 will be accepted external optical signals, and light signal is converted into current signal, the existing visible light sensor in market, and as the EL7900 of intersil, series of products such as the LX1971/2 of Microsemi can use.The electric signal of its output is through the amplification of operational amplifier 32, change voltage signal into, utilize formula Vout=Iout * R2 can calculate the size of feedback voltage, then be sent to microprocessor 11, the current sample feedback signal of sample circuit 41 also is sent to microprocessor 11 simultaneously.Microprocessor 11 is the feedback voltage and the current sample feedback signal of photoinduction circuit relatively, if the ratio that both ratios equal to set will not exported brightness control signal, promptly keeps present state.If both ratios are not equal to the value of setting, the output brightness control signal is regulated the current value of backlight lighting tube, thereby change the brightness of display, finally reach setting value, and the value that will configure preservation, finish whole automatic adjustment function.If the user does not want to use this function, in manual adjustments brightness, microprocessor 11 can cut out optical sensor 31 by logic switching circuit 14.

Claims (3)

1, a kind of liquid crystal display capable of automatic regulating brightness comprises microprocessor control module (1) and coupled brightness regulation module (2),
Described microprocessor control module (1) comprises that one is accepted instruction and the output control signal is given the microprocessor (11) of brightness regulation module (2), and be connected with microprocessor (11) be used for preserving the ROM (read-only memory) (12) that the user is provided with parameter;
Described brightness regulation module (2) comprises a converse device (21) that is connected with microprocessor (11) and the backlight of LCD regulating circuit (22) that is connected with converse device (21);
It is characterized in that: it also is provided with brightness acquisition module (3) and brightness feedback module (4),
Described brightness acquisition module (3) comprises an optical sensor (31) and the operational amplifier (32) that is connected with optical sensor (31), the output terminal of operational amplifier (32) connects microprocessor (11), optical sensor (31) is used to gather the ambient brightness data, light signal is converted into current signal, the current signal of output is through the amplification of operational amplifier (32), change voltage signal and input microprocessor (11) into, microprocessor (11) with this voltage signal and preset value relatively and export control signal;
Described brightness feedback module (4) comprises the sample circuit (41) that is connected with backlight regulating circuit (22), the output terminal of sample circuit (41) connects microprocessor (11) and converse device (21), and this sample circuit (41) is sent to microprocessor (11) to carry out feedback regulation with the backlight sampled signal.
2, liquid crystal display capable of automatic regulating brightness according to claim 1, it is characterized in that: microprocessor control module (1) also comprises a control panel that is used for manual adjustments (13) that links to each other with microprocessor (11), be provided with an on-off circuit (14) between microprocessor control module (1) and brightness acquisition module (3), described on-off circuit (14) is used to cut out brightness acquisition module (3) when control panel (13) is worked.
3, a kind of method that can regulate LCD brightness automatically, this method comprises the following steps:
(1) gathers the ambient brightness data;
(2) brightness data is handled;
(3) luminance data values and the preset value after will handling compares, if result relatively is for being, then to step (7); If result relatively is for not, then to next step;
(4) output brightness control signal;
(5) regulate LCD brightness;
(6) brightness value and preset value are compared, if result relatively is for being, then to next step, if result relatively then returns step (4) for not;
(7) preserve Set For Current.
CN 200510022678 2005-12-28 2005-12-28 Liquid crystal display capable of automatic regulating brightness and its regulating method Pending CN1794044A (en)

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CN100592357C (en) * 2007-04-26 2010-02-24 海尔集团公司 Process for startup and closing backlight lamp of liquid crystal screen and control system thereof
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CN107168473A (en) * 2017-06-30 2017-09-15 太仓市格雷得五金有限公司 A kind of display with eye-protecting function
CN107478328A (en) * 2017-09-19 2017-12-15 珠海格力电器股份有限公司 Photosensitive device, display brightness adjusting system and display
CN114078448A (en) * 2021-10-26 2022-02-22 许继集团有限公司 Device and method for intelligently adjusting backlight brightness of liquid crystal

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