CN201628833U - LCD (liquid crystal display) backlight module capable of automatically adapting to ambient light change - Google Patents
LCD (liquid crystal display) backlight module capable of automatically adapting to ambient light change Download PDFInfo
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- CN201628833U CN201628833U CN2010201150450U CN201020115045U CN201628833U CN 201628833 U CN201628833 U CN 201628833U CN 2010201150450 U CN2010201150450 U CN 2010201150450U CN 201020115045 U CN201020115045 U CN 201020115045U CN 201628833 U CN201628833 U CN 201628833U
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- liquid crystal
- crystal display
- chip microcomputer
- backlight module
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Abstract
The utility model discloses an LCD (liquid crystal display) backlight module capable of automatically adapting to ambient light change, which mainly comprises a keying circuit, PN23CV silicon photocells, an auxiliary circuit, an LED backlight driving circuit using DD313 as the core, and a single chip microcomputer. The two PN23CV silicon photocells are electrically connected with the auxiliary circuit; the auxiliary circuit is electrically connected with an I/O interface of the single chip microcomputer; the LED backlight driving circuit using DD313 as the core is electrically connected with the I/O interface of the single chip microcomputer; pins (6, 11, 13) of DD313 are electrically connected with LED. The LCD backlight module can automatically adjust brightness according to ambient light change and can provide more comfortable vision effect for the user.
Description
Technical field
The utility model relates to a kind of liquid crystal display backlight module, relates in particular to the liquid crystal display backlight module that the light that can conform automatically changes.
Background technology
At present, liquid crystal display has become indispensable visual plant.In order to allow the comfortable use liquid crystal display of user, liquid crystal display should have different brightness under different ambient lights, so the liquid crystal display backlight module should be able to be regulated brightness automatically according to ambient light, each user has the brightness preference of oneself, so also able person's wage adjustment joint brightness of user.The existing multinomial technology that relates to automatic adjusting brightness.Yet weak point is arranged all in these technology, as: 1. the perception aspect of pair surround lighting does not fully take into account the influence of the visibility curve of human eye, the people observes the light source of the different wave length of same energy, feeling of brightness that obtains and illumination is different, and these technology and device can accurately not reflect this relation, thereby the brightness that obtains and illumination result are inaccurate, the spectral range of having considered the spectral range of ambient light sensor and human eye in the part technology is consistent, and does not consider that device should be consistent with the visibility curve of human eye to the response curve of spectrum.2. finish according to ambient light illumination in the function of LCD screen backlight automatic brightness adjustment, can not provide the corresponding relation between simple display backlight brightness and the ambient light, after user manual amendment brightness, this relation can not be revised by system.3. finish according to ambient light in the function of display backlight automatic brightness adjustment, by changing voltage or current signal the brightness of display backlight is changed, and the display backlight brightness of measuring reality, think and load same voltage or current signal, same display backlight brightness remains constant, yet the backlight illumination of actual display screen is influenced by voltage or current signal not only, also be subjected to temperature and the influence of total service time, stable from the display screen display screen of starting working, the temperature of inner member is changing, thereby brightness also changes, the high-power liquid crystal display of under cold environment, working especially, and this variation meeting is apparent in view.
Therefore, how overcoming above-mentioned technological deficiency is the problem that presses for solution.
Summary of the invention
In order to overcome above-mentioned technical disadvantages, the purpose of this utility model be allow the user obtain accurate perception ambient light, accurately measure display brightness, can regulate display backlight brightness, the brightness of able person's wage adjustment joint automatically continuously, can revise the liquid crystal display backlight module of the relation of display backlight brightness and ambient light relation, the customer satisfaction system display backlight brightness of memory and ambient light automatically by surround lighting according to given corresponding relation.
To achieve these goals, the utility model provides a kind of liquid crystal display backlight module, and this liquid crystal display backlight module mainly comprises: key circuit, PN23CV type silicon photocell, auxiliary circuit, be LED-backlit driving circuit, single-chip microcomputer of core etc. with DD313; Two PN23CV type silicon photocells are electrically connected with auxiliary circuit, and auxiliary circuit is electrically connected with the I/O mouth of single-chip microcomputer, are that the LED-backlit driving circuit of core is electrically connected with the single-chip processor i/o mouth with DD313, and 6,11,13 pins of DD313 are electrically connected with LED.
Single-chip microcomputer adopts STC12C5608AD, and packing forms is SOP-28, is operated in the 12MHZ frequency.
Key circuit is electrically connected with single-chip microcomputer, and auxiliary circuit contains OP07CP.
Single-chip microcomputer is electrically connected three kinds of color LED of corresponding red, green, blue respectively by 17,11,12 pins with ENR, ENG, the ENB pin of DD313.
Key circuit: when the user was dissatisfied to result with an automatic light meter, oneself regulated display brightness, and this module is converted into electric signal with user's action and gives single-chip microcomputer.
PN23CV type silicon photocell: perception ambient light exactly and actual backlight illumination, by auxiliary circuit illumination and luminance signal are converted into electric signal, send this electric signal to single-chip microcomputer.
With DD313 is the backlight drive circuit of core: accept the various control signals that single-chip microcomputer sends, for example brilliance control, color control or the like.
Single-chip microcomputer: receive the ambient light signal that silicon photocell and auxiliary circuit send, reduce the influence of noise signal in the surround lighting through filtering, can produce the PWM ripple as the LED light fixture, obtain the average signal of ambient light, corresponding relation according to backlight illumination and ambient light, obtain liquid crystal display luminance signal backlight through computing, compare with the luminance signal that illuminant module sends, if necessary, then send control signal and give the LED-backlit driving circuit that DD313 is a core, regulate its brightness.The signal that sends according to key circuit also, send that to control signal to DD313 be the LED-backlit driving circuit of core, regulate its brightness, and change the corresponding relation of backlight illumination and ambient light, new corresponding relation is placed in the storer, so that call next time.
To achieve these goals, the utility model has also used the corresponding relation of a kind of liquid crystal display backlight illumination and ambient light, and the method for this relation being made amendment according to user's demand.In the corresponding relation that the utility model uses: the illumination of surround lighting represents that with x liquid crystal display brightness backlight represents that with y both passes are:
y＝kx+b (1)
Wherein the single-chip microcomputer storage reflects the k and the b of ambient light and liquid crystal display backlight illumination relation, and k and b do not lose after the power down, b is that surround lighting is 0 o'clock liquid crystal display backlight illumination, what reflect is that the people clearly observes object in the environment of dark, the brightness that object should have, k is that the light characteristic of occurring in nature common objects under natural light irradiation of reference set, and k and b be greater than 0, and can change according to user's needs.
Use above-mentioned corresponding relation to calculate the liquid crystal display backlight illumination in self-regulating process, in order to satisfy requirements of different users, need adjust above-mentioned corresponding relation, the utility model has used a kind of amending method: be x in ambient light
tThe time, self-regulating brightness is y
t=kx
t+ b, when the user was dissatisfied to self-regulating brightness, manual shift brightness was to y '
t, call following formula and calculate:
b
MinAnd k
MinAll be to determine that according to main environment for use the two is all greater than 0 by system designer.
Get b ' and b
MinBigger value in the two deposits in the circuit as adjusted b value.
Get k ' and k
MinBigger value in the two deposits in the circuit as adjusted k value, thereby finishes the modification that concerns between liquid crystal display brightness and the ambient light.
B when system is initial in the circuit and k value are used b respectively
sAnd k
sExpression, this is that system designer determines that the user can not revise this value, makes b and k value get back to b respectively but can regulate by key circuit
sAnd k
sValue is used b
sAnd k
sValue deposit in respectively among b and the k.
Calculate b ' and k ' time, set b
s=100, k
s=33, b
Min=10, k
Min=0.3.
To achieve these goals, the utility model provides the course of work of liquid crystal display.This process comprises (a) to (p):
(a), single-chip microcomputer powers on;
(b), single-chip microcomputer carries out initialization;
(c), read ambient light;
(d), according to ambient light theory of computation display brightness;
(e), open liquid crystal panel and begin displaying contents;
(f), read actual displayed brightness;
(g), judge whether that according to theoretical brightness and actual displayed brightness needs revise actual displayed brightness, revise if desired, then adjust actual displayed brightness;
(h), read ambient light once more;
(i), according to ambient light theory of computation display brightness;
(j), read actual displayed brightness;
(k), judge whether that according to theoretical brightness and actual displayed brightness needs revise actual displayed brightness, revise if desired, then adjust actual displayed brightness;
(l), detect the user and have or not actuation of keys;
(m), judge whether and need regulate actual displayed brightness according to customer requirements, revise if desired, then regulate intrinsic brilliance to user's satisfactory value, and timer resets and picks up counting;
(n), judge whether the time of timer record reach designated value, if reach designated value, then calculate new b and k value, and it deposited in the circuit, adjustment display brightness and ambient light corresponding relation, and timer is resetted stop timing;
(o), detect the user and whether need to get back to b
sAnd k
s, if desired, use b
sAnd k
sValue deposits in respectively among b and the k;
(p), repeat the circulation of h to o.
The utility model provides a kind of liquid crystal display backlight module, its beneficial effect is, can regulate display brightness automatically continuously according to surround lighting according to given corresponding relation, also can regulate brightness by button, system can revise display brightness and ambient light relation automatically, remembers the relation of customer satisfaction system display brightness and ambient light, has improved the display quality of liquid crystal display, make the user obtain the display brightness of the most comfortable, demonstrated fully the design of hommization.
For to further understanding of the present utility model, will be by enforcement of the present utility model being described in conjunction with following accompanying drawing.
Description of drawings
Fig. 1 is the theory structure block diagram of liquid crystal display backlight module of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Among Fig. 1: 1.LED is backlight, 2. is the LED-backlit driving circuit of core with DD313,3.PN23CV type silicon photocell, 4. auxiliary circuit, 5. single-chip microcomputer, 6. key circuit.
Embodiment
Embodiment of the present utility model will be elaborated in conjunction with the accompanying drawings.
See figures.1.and.2, the liquid crystal display backlight module that the light that can conform automatically changes comprises two PN23CV type silicon photocells, single-chip microcomputer, key circuit, is LED-backlit driving circuit, the auxiliary circuit of core with DD313.
The illumination and the liquid crystal display brightness backlight of PN23CV type silicon photocell perception surround lighting, auxiliary circuit sends signal to single-chip microcomputer after handling, single-chip microcomputer calculates liquid crystal display theoretical brightness backlight, the intrinsic brilliance backlight with liquid crystal display compares, judge whether to need to adjust liquid crystal display brightness backlight, if desired, then giving DD313 is the backlight drive circuit transmission signal of core, regulates liquid crystal display intrinsic brilliance backlight.When the user is dissatisfied to self-regulating result, by key circuit user's action is converted into electric signal, send single-chip microcomputer to, single-chip microcomputer judges whether to need to adjust liquid crystal display brightness backlight, if desired, then giving DD313 is the LED-backlit driving circuit transmission signal of core, regulates backlight illumination, after postponing a period of time, revise b and k value.
PN23CV type silicon photocell is optionally decayed to the light of the various wavelength of incident, this device carries the vision function color filter, have two photoelectric cells, a slice perception ambient light signal, the luminance signal of a slice perception LED-backlit, it is 5 millimeters circular hole that one diameter is arranged on the other frame of liquid crystal panel, the PN23CV type silicon photocell of reception environment light is placed on the circular hole rear, surround lighting is radiated on the PN23CV type silicon photocell by circular hole, it is 2 millimeters circular hole that one diameter is arranged near the backlight of liquid crystal panel, the PN23CV type silicon photocell that receives liquid crystal display brightness is placed on the circular hole opposite side, receives the backlight of liquid crystal display; After two path signal was amplified through auxiliary circuit, the voltage of output was to the response curve of various wavelength light and the human eye basically identical of experiencing to various wavelength light; Because in the actual liquid crystal display, back light source brightness is the several times of brightness of display screen, so the enlargement factor of two paths of signals is inconsistent.In Single Chip Microcomputer (SCM) program, the input optical signal of two-way is repeatedly sampled and filtering, obtain light signal accurately.After amplifying by operational amplifier OPO7CP, the signal that PN23CV produces delivers to 20,21 pins of single-chip microcomputer, adopt two stage amplifer, adopt electric capacity to reduce the influence of clutter (can the produce the PWM ripple) composition in the surround lighting in the amplifying circuit as the LED light fixture, make output signal steady, adopt adjustable resistance to change enlargement factor, make output voltage in the scope of the AD of single-chip microcomputer mouth.
Key circuit mainly is converted into electric signal with user's action, send single-chip microcomputer to, the mode that the utility model adopts is to use button and resistance, as shown in Figure 2, the output voltage that pushes button is VCC, discharges button, output voltage is 0, press SW1 and represent that customer requirements increases display brightness, press SW2 and represent that customer requirements reduces display brightness, SW1, SW2 are pressed and represent to get back to the value of the setting b of initial b and k
sAnd k
s, SW1, SW2 are connected on 8,9 two pins of single-chip microcomputer respectively.
Single-chip microcomputer mainly receives the signal that PN23CV type silicon photocell, auxiliary circuit and key circuit send, and carries out computing and judgement, sends control signal, storage operation result etc.Single-chip microcomputer is selected STC12C5608AD for use, and packing forms is SOP-28, is operated under the 12MHZ frequency, and it contains 8 tunnel 10 A/D conversions, can choose two-way reception environment light signal and backlight illumination signal respectively; Contain 6 timers, can select a timer, timer resets after the user adjusts brightness at every turn, picks up counting, and after delay a period of time, does not detect actuation of keys, then calculates new b and k value; The Flash program storage of 8K and the SRAM of 768 bytes are contained in this single-chip microcomputer inside, also have EEPROM, can satisfy storage demand.
Because what LCD adopted is that PWM ripple regulative mode is regulated brightness, so be the PWM ripple by the program setting output signal; Backlight drive circuit adopts DD313 driving LED lamp as backlight, 17,11,12 pins, three road signals of single-chip microcomputer are controlled ENR (3 pin), ENG (4 pin), the ENB (5 pin) of DD313 respectively, three kinds of color LED of corresponding red, green, blue, DD313 exports three tunnel current drives LED by OUTR (13 pin), OUTG (11 pin), OUTB (6 pin).
Claims (6)
1. the liquid crystal display backlight module that the light that can conform automatically changes, it is characterized in that: mainly comprise key circuit, PN23CV type silicon photocell, auxiliary circuit, be LED-backlit driving circuit, the single-chip microcomputer of core with DD313, two PN23CV type silicon photocells are electrically connected with auxiliary circuit, auxiliary circuit is electrically connected with the I/O mouth of single-chip microcomputer, the LED-backlit driving circuit that with DD313 is core is electrically connected with the single-chip processor i/o mouth, and 6,11,13 pins of DD313 are electrically connected with LED.
2. the liquid crystal display backlight module that the light that can conform automatically according to claim 1 changes, it is characterized in that: single-chip microcomputer adopts STC12C5608AD, and packing forms is SOP-28, is operated in the 12MHZ frequency.
3. the liquid crystal display backlight module that the light that can conform automatically according to claim 1 changes is characterized in that: the k and the b of single-chip microcomputer storage reflection ambient light and liquid crystal display backlight illumination relation, k and b are greater than 0.
4. the liquid crystal display backlight module that the light that can conform automatically according to claim 1 changes, it is characterized in that: key circuit is electrically connected with single-chip microcomputer.
5. the liquid crystal display backlight module that the light that can conform automatically according to claim 1 changes, it is characterized in that: auxiliary circuit contains OP07CP.
6. the liquid crystal display backlight module that the light that can conform automatically according to claim 1 changes, it is characterized in that: single-chip microcomputer is electrically connected three kinds of color LED of corresponding red, green, blue respectively by 17,11,12 pins with ENR, ENG, the ENB pin of DD313.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201150450U CN201628833U (en) | 2010-01-23 | 2010-01-23 | LCD (liquid crystal display) backlight module capable of automatically adapting to ambient light change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201150450U CN201628833U (en) | 2010-01-23 | 2010-01-23 | LCD (liquid crystal display) backlight module capable of automatically adapting to ambient light change |
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| Publication Number | Publication Date |
|---|---|
| CN201628833U true CN201628833U (en) | 2010-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201150450U Expired - Fee Related CN201628833U (en) | 2010-01-23 | 2010-01-23 | LCD (liquid crystal display) backlight module capable of automatically adapting to ambient light change |
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104853483A (en) * | 2015-04-16 | 2015-08-19 | 北京迈特力德信息技术有限公司 | Method and device for setting light level |
| CN106782299A (en) * | 2017-01-23 | 2017-05-31 | 福建师范大学福清分校 | A kind of intelligent dimming LED screen |
| CN107464530A (en) * | 2016-06-06 | 2017-12-12 | 北京迪文科技有限公司 | A kind of method for improving the liquid crystal display LED backlight life-span |
-
2010
- 2010-01-23 CN CN2010201150450U patent/CN201628833U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104853483A (en) * | 2015-04-16 | 2015-08-19 | 北京迈特力德信息技术有限公司 | Method and device for setting light level |
| CN107464530A (en) * | 2016-06-06 | 2017-12-12 | 北京迪文科技有限公司 | A kind of method for improving the liquid crystal display LED backlight life-span |
| CN106782299A (en) * | 2017-01-23 | 2017-05-31 | 福建师范大学福清分校 | A kind of intelligent dimming LED screen |
| CN106782299B (en) * | 2017-01-23 | 2019-04-09 | 福建师范大学福清分校 | A kind of intelligent dimming LED screen |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20101110 Termination date: 20140123 |