CN110838280B - Liquid crystal display device with a light guide plate - Google Patents
Liquid crystal display device with a light guide plate Download PDFInfo
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- CN110838280B CN110838280B CN201911183085.0A CN201911183085A CN110838280B CN 110838280 B CN110838280 B CN 110838280B CN 201911183085 A CN201911183085 A CN 201911183085A CN 110838280 B CN110838280 B CN 110838280B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 91
- 238000001514 detection method Methods 0.000 claims abstract description 117
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 230000000875 corresponding effect Effects 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000002441 reversible effect Effects 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 206010070834 Sensitisation Diseases 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 230000008313 sensitization Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a liquid crystal display, and relates to the technical field of display devices. The device is characterized by comprising a liquid crystal panel, a backlight source, a light source driving module, a detection frame surrounding the brightness of the peripheral outer wall of the liquid crystal panel and a maximum light intensity estimation module electrically connected with the light source driving module, wherein four sides of the detection frame are provided with a photosensitive detector and a servo driving module in a sliding manner, and the photosensitive detector is used for outputting the light intensity of ambient light at the position of the photosensitive detector; the servo driving module is used for outputting the position of the photosensitive detector; the maximum light intensity estimation module estimates and obtains the position of the maximum light intensity of the liquid crystal panel and the maximum light intensity value of the liquid crystal panel based on the position of the maximum light intensity detected by each photosensitive detector and the position of the maximum light intensity output by the servo driving module corresponding to each photosensitive detector. The invention has the advantage of improving the viewing quality of the liquid crystal display.
Description
Technical Field
The invention relates to the technical field of display devices, in particular to a liquid crystal display.
Background
Currently, a liquid crystal display is a display device composed of a liquid crystal display panel and a backlight. And the backlight source is used as a light source generator for providing light source in the liquid crystal display, and the display brightness of the liquid crystal display panel is determined by the brightness of the backlight source.
In the prior art, chinese patent publication No. CN101097309B discloses a liquid crystal display device and a driving method thereof. It includes disclosing a liquid crystal display device, which includes: a liquid crystal panel; a backlight unit supplying light to the liquid crystal panel; a light sensor detecting brightness of an ambient environment surrounding the liquid crystal panel and generating a current analog type sensing signal; and a signal processor for adjusting the brightness of the backlight unit according to the current analog type sensing signal. In order to improve the adaptability of the liquid crystal display to the ambient light, the liquid crystal display device detects the light intensity change of the ambient light by an external optical sensor, increases the brightness of the backlight source when the light intensity of the ambient light is increased, and reduces the brightness of the backlight source when the light intensity of the ambient light is reduced.
Similar to the above-mentioned lcd in the prior art, when the screen of the lcd panel is large, the manner of acquiring the brightness of the lcd is fixed, and only a local screen is illuminated by the strong light, and when the brightness in the area cannot be detected, the picture quality of the area illuminated by the strong light in the screen is seriously affected, or even the lcd cannot be normally viewed.
Disclosure of Invention
In view of the above-mentioned problems, it is an object of the present invention to provide a liquid crystal display having the advantage of improving the viewing quality of the liquid crystal display by detecting the brightness of the liquid crystal panel.
In order to achieve the purpose, the invention provides the following technical scheme: a liquid crystal display comprises a liquid crystal panel, a backlight source and a light source driving module, wherein the light source driving module is electrically connected with the backlight source and used for driving the backlight source to emit light, the liquid crystal display also comprises a detection frame surrounding the brightness on the peripheral outer wall of the liquid crystal panel and a maximum light intensity estimation module electrically connected with the light source driving module, four sides of the detection frame are provided with photosensitive detectors in a sliding manner, servo driving modules driving the photosensitive detectors to slide in the four sides of the detection frame are arranged in the detection frame, and the maximum light intensity estimation module is also electrically connected with the photosensitive detectors and the servo driving modules;
the detection frame comprises two long detection edges and two wide detection edges vertically arranged between two ends of the two long detection edges;
the photosensitive detector is used for outputting the light intensity of the ambient light at the position where the photosensitive detector is located;
the servo driving module is used for outputting the position of the photosensitive detector;
the maximum light intensity estimation module estimates and obtains the position of the maximum light intensity of the liquid crystal panel and the maximum light intensity value of the liquid crystal panel based on the position of the maximum light intensity detected by each photosensitive detector and the position of the maximum light intensity output by the servo driving module corresponding to each photosensitive detector; and the maximum light intensity estimation module determines the luminous intensity of the backlight source based on the maximum light intensity value of the liquid crystal panel;
and the light source driving module controls the brightness output of the backlight source according to the luminous intensity of the backlight source determined by the maximum light intensity estimation module.
By adopting the technical scheme, the four photosensitive detectors are respectively arranged on the four side edges of the detection frame in a sliding manner, and the sliding positions of the four photosensitive detectors are controlled by the driving of the servo driving module; therefore, the four photosensitive detectors can detect and acquire the illumination intensity at each position of the detection frame;
the maximum light intensity value in the liquid crystal panel is estimated by integrating the four photosensitive detectors and the servo driving module through the maximum light intensity estimation module; and controlling the luminous intensity of the backlight source through the estimated maximum light intensity value; and the maximum light intensity value that obtains through above-mentioned mode also can compare in the more accurate detection of current mode in the condition that only partial screen was shone by the highlight to adjust the luminance of backlight, promote the quality of watching.
The invention is further configured to: the servo driving module comprises a servo motor, a linkage mechanism, a driving belt and a driving piece; the servo motor is used as a power source to provide forward rotation and reverse rotation power and is used for outputting position signals to the maximum light intensity estimation module, the driving belts are annularly arranged in four sides of the detection frame, the linkage module is in linkage connection with the servo motor and the driving belts, the driving members are arranged into four groups, and the four groups of driving members are respectively arranged on the driving belts corresponding to the four photosensitive detectors and are used for driving the four photosensitive detectors to respectively slide on the four sides of the detection frame in a reciprocating mode.
By adopting the technical scheme, the driving belt can synchronously rotate clockwise or anticlockwise under the driving of the servo motor through the linkage mechanism, the driving belt can drive four groups of driving pieces to synchronously move when rotating, and the driving pieces can drive the photosensitive detectors to slide when moving, so that the four photosensitive detectors can be driven by one servo motor at the same time, the cost is saved, and the moving synchronism of all the photosensitive detectors is improved.
The invention is further configured to: the long detection edge and the wide detection edge are provided with slideways for the photosensitive detector to slide linearly on the outer side of the driving belt.
By adopting the technical scheme, the light-sensitive detector can stably slide along the linear direction due to the arrangement of the slide way.
The invention is further configured to: and a trigger block for abutting and driving the driving piece is arranged on the inner side of the photosensitive detector facing the driving belt in a protruding mode.
Through adopting above-mentioned technical scheme, the mode through butt trigger block drives the sensitization detector and removes, does not influence the detection of sensitization detector at first, and the drive sensitization detector that secondly also can be stable slides on the slide.
The invention is further configured to: the driving piece comprises a clockwise driving block and a counterclockwise driving block, the photosensitive detector is arranged between the clockwise driving block and the counterclockwise driving block of the corresponding driving piece, the clockwise driving block is used for pushing the photosensitive detector to slide when the servo motor drives the driving belt to move clockwise, and the counterclockwise driving block is used for pushing the photosensitive detector to slide when the servo motor drives the driving belt to move counterclockwise.
Through adopting above-mentioned technical scheme, through the setting of driving the piece in the same direction as time and driving the piece in the opposite direction for servo motor corotation a cycle reversal a cycle can drive the sensitization detector and reset to original position.
The invention is further configured to: the distance between the clockwise driving block and the counterclockwise driving block corresponding to the driving member on the wide detection edge is larger than the distance between the clockwise driving block and the counterclockwise driving block corresponding to the driving member on the long detection edge.
By adopting the technical scheme, the distance between the clockwise driving block and the anticlockwise driving block of the driving piece on the wide detection edge is increased, so that the sliding distance of the photosensitive detector on the wide detection edge can be shortened, and the synchronous driving of one servo motor can be realized under the condition that the long detection edge is longer than the wide detection edge.
The invention is further configured to: the maximum light intensity estimation module constructs a two-dimensional coordinate on the plane where the liquid crystal panel is located, and respectively acquires the coordinates where the maximum light intensity is output by the four photosensitive detectors based on the output signals of the four photosensitive detectors and the servo driving module;
the maximum light intensity estimation module calculates weighted mean value coordinates based on the maximum light intensity value of coordinates where the maximum light intensity is output by the four photosensitive detectors, and judges the weighted mean value coordinates obtained through calculation as the coordinates where the maximum light intensity of the liquid crystal panel is located.
By adopting the technical scheme, the coordinate of the maximum light intensity of the reference photosensitive detector forms a reference coordinate, and the maximum light intensity on the liquid crystal panel can be acquired more accurately.
The invention is further configured to: the maximum light intensity estimation module compares the maximum light intensity values output by the four photosensitive detectors in sequence and sequences the maximum light intensity values;
based on the three photosensitive detectors in the first three of the maximum light intensity values, estimating the brightness change value of the unit abscissa, the brightness change value of the unit ordinate and the maximum light intensity value of the liquid crystal panel;
wherein,
is a luminance change value in units of abscissa,
is a luminance change value in units of ordinate,
is the maximum light intensity value output by the photosensitive detector,
the abscissa on which the maximum light intensity value is output by the light detector,
the ordinate on which the maximum light intensity value output by the light detector is located,
which is the abscissa of the coordinate on which the maximum light intensity of the liquid crystal panel is located,
which is the ordinate of the coordinate at which the maximum light intensity of the liquid crystal panel is located,
is the maximum light intensity value of the liquid crystal panel.
By adopting the technical scheme, the light intensity variation is switched into the luminance variation value of the abscissa and the luminance variation value of the ordinate, the detection accuracy can be improved, the calculation result does not need to reuse other data, and the calculation is convenient.
The invention is further configured to: the maximum light intensity estimation module determines the luminous intensity of the backlight source to be positively correlated with the estimated maximum light intensity value of the liquid crystal panel.
By adopting the technical scheme, the maximum light intensity on the liquid crystal panel is larger, and the brightness of the backlight source is controlled to be increased.
Compared with the prior art, the invention has the beneficial effects that:
(1) a slipping photosensitive detector is arranged, so that the brightness of the outer frame of the liquid crystal panel can be comprehensively detected by using only four sensors;
(2) when the photosensitive detector adopting the servo motor is used for obtaining the maximum light intensity value, the corresponding coordinate can be obtained, and the detection precision is improved;
(3) the brightness of the backlight source can be comprehensively adjusted through the cooperation of the maximum light intensity estimation module and the light source driving module.
Drawings
FIG. 1 is a schematic diagram of a liquid crystal display;
FIG. 2 is a block diagram of the connection of modules within the LCD;
FIG. 3 is a schematic structural view of the detection frame being hidden and then being highlighted;
fig. 4 is an enlarged schematic view of a in fig. 3.
Reference numerals: 1. a liquid crystal panel; 2. a backlight source; 3. a light source driving module; 4. detecting a frame; 5. a maximum light intensity estimation module; 6. a wide detection edge; 7. a long detection edge; 8. a light sensitive detector; 9. a servo motor; 10. a drive belt; 11. a driver; 12. a gear set; 13. a drive wheel; 14. a trigger block; 15. a slideway; 16. driving the block in time; 17. driving the block in reverse time; 18. light-transmitting protective shell.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
In an embodiment, a liquid crystal display, as shown in fig. 1 and 2, includes a liquid crystal panel 1, a backlight 2, a light source driving module 3, a detection frame 4, and a maximum light intensity estimating module 5. The liquid crystal panel 1 displays image information as a display region. The backlight 2 is connected to the back of the liquid crystal panel 1 to supply light to the liquid crystal panel 1. The light source driving module 3 is electrically connected to the backlight 2 for controlling the luminance of the light emitted by the backlight 2. The detection frame 4 is surrounded on the outer wall of the periphery of the liquid crystal panel 1 in a rectangular shape, four sides of the detection frame 4 are provided with photosensitive detectors 8 respectively, the photosensitive detectors are used for obtaining the illumination intensity of each position on the detection frame 4, the maximum light intensity estimation module 5 obtains the illumination intensity of each position on the detection frame 4 based on the output of the photosensitive detectors 8, and the position of the maximum light intensity of the liquid crystal panel 1 and the maximum light intensity value of the liquid crystal panel 1 are obtained through estimation; and the maximum light intensity estimation module 5 determines the light emission intensity of the backlight 2 based on the estimated maximum light intensity value of the liquid crystal panel 1, and the light source driving module 3 controls the luminance output of the backlight 2 according to the light emission intensity of the backlight 2 determined by the maximum light intensity estimation module 5.
As shown in fig. 2 and 3, the detection frame 4 is hollowed out and includes two long detection edges 7 and two wide detection edges 6 vertically arranged between two ends of the two long detection edges 7; only one photosensitive detector 8 is arranged in each of the two long detection edges 7 and the two wide detection edges 6, and the four photosensitive detectors 8 are respectively arranged on the two long detection edges 7 and the two wide detection edges in a sliding manner. Meanwhile, servo driving modules for driving the four photosensitive detectors 8 to slide in the four side edges of the detection frame 4 are installed in the detection frame 4, and the sliding positions of the four photosensitive detectors 8 are controlled by the driving of the servo driving modules; therefore, the four photosensitive detectors 8 can detect and acquire the illumination intensity of each position of the detection frame 4, and the servo driving module outputs position signals to the maximum light intensity estimation module 5 corresponding to the maximum light intensity output by each photosensitive detector 8.
Specifically, as shown in fig. 3 and 4, the servo drive module includes a servo motor 9, a linkage mechanism, a drive belt 10 and a driver 11; the servo motor 9 is used as a power source for providing forward rotation and reverse rotation power and is used for outputting a position signal to the maximum light intensity estimation module 5. The linkage mechanism comprises a gear set 12 and four driving wheels 13, and the four driving wheels 13 are respectively rotatably arranged on four corners of the detection frame 4; the driving belt 10 is sleeved outside the four driving wheels 13, so that the driving belt 10 is annularly arranged in the detection frame 4; the four driving wheels 13 comprise a driving wheel 13 and three driven driving wheels 13, the driving wheel 13 is used for providing power for the driving belt 10 to rotate clockwise or anticlockwise in the annular direction, and the three driven driving wheels 13 are used for being driven by the driving belt 10 to rotate after the driving belt 10 rotates; in order to prevent the drive belt 10 from slipping during rotation, the drive belt 10 and the drive wheel 13 are preferably a toothed belt with teeth on the inner wall and a toothed wheel with teeth on the outer circumferential wall, respectively.
In this embodiment, as shown in fig. 3 and 4, the driving wheel is disposed at the upper right corner of the detection frame 4, and the gear set 12 is used for linking the rotating shaft of the servo motor 9 and the driving wheel. In order that the servo motor 9 occupies the thickness of the detection frame 4, a bevel gear set 12 is adopted in the gear set 12, a driving bevel gear of the bevel gear set 12 is connected to a rotating shaft of the servo motor 9 in a key mode, and a driven bevel gear of the bevel gear set 12 is connected to a rotating shaft of a driving wheel 13 in a key mode; the driving bevel gear is meshed with the driven bevel gear, and the axial direction of the driving bevel gear is vertical to the axial direction of the driven bevel gear. Therefore, under the action of the bevel gear set 12, the servo motor 9 is fixed on the side of the detection frame 4 close to the back in parallel with the driving belt 10.
As shown in fig. 3 and 4, the driving members 11 are provided in four groups, four groups of driving members 11 are respectively installed on the driving belt 10 corresponding to the four photosensitive detectors 8 for driving the four photosensitive detectors 8 to respectively slide on the four sides of the detection frame 4 in a reciprocating manner, wherein the four groups of driving members 11 are alternately arranged on the driving belt 10, and the two groups of driving members 11 on the long detection edge 7 and the two groups of detection members on the wide detection edge 6 are both arranged on the driving belt 10 in a centrosymmetric manner with the midpoint of the liquid crystal panel 1 as a symmetric point. Specifically, the long detection edge 7 and the wide detection edge 6 are both provided with a slideway 15 for the photosensitive detector 8 to slide linearly outside the driving belt 10. In this embodiment, the slide way 15 is a slide rod, and the photosensitive detector 8 is provided with a slide sleeve sleeved on and sliding on the slide rod; through the matching of the sliding rod and the sliding sleeve, the photosensitive detector 8 can stably slide on the long detection edge 7 or the wide detection edge 6 where the photosensitive detector is positioned along the linear direction; it is worth mentioning that the sliding damping can be adjusted before the sliding rod and the sliding sleeve are used, so that the photosensitive detector 8 can not slide down under the action of gravity. In order to ensure that the photosensitive detector 8 is not blocked in the sliding process, a light-transmitting protective shell 18 (see fig. 1) is arranged on the outer side of the detection outer frame corresponding to the position of the sliding rod, and plays a role in transmitting light and protecting.
As shown in fig. 3 and 4, the driving member 11 includes a clockwise driving block 16 and a counterclockwise driving block 17, the photosensitive detector 8 is disposed between the clockwise driving block 16 and the counterclockwise driving block 17 corresponding to the driving member 11, the clockwise driving block 16 is used for pushing the photosensitive detector 8 to slip by abutting when the driving belt 10 is driven by the servo motor 9 to move clockwise, and the counterclockwise driving block 17 is used for pushing the photosensitive detector 8 to slip by abutting when the driving belt 10 is driven by the servo motor 9 to move counterclockwise. In order to facilitate the photosensitive detector 8 to be driven to slide, a trigger block 14 for abutting and driving the driving member 11 is protruded on the inner side of the photosensitive detector 8 facing the driving belt 10.
As shown in fig. 3 and 4, since the long detection side 7 is longer than the wide detection side 6, the slippage between the long detection side 7 and the wide detection side 6 is not affected. The distance between the forward-time driver block 16 and the reverse-time driver block 17 corresponding to the driver 11 on the wide detection edge 6 is greater than the distance between the forward-time driver block 16 and the reverse-time driver block 17 corresponding to the driver 11 on the long detection edge 7. Specifically, the clockwise driving block 16 and the counterclockwise driving block 17 of the driving member 11 corresponding to the long detection edge 7 are attached to two sides of the triggering block 14 of the photosensitive detector 8; the clockwise driving block 16 and the counter-clockwise driving block 17 of the driving part 11 corresponding to the wide detection edge 6 are arranged at two sides of the triggering block 14 of the photosensitive detector 8 at intervals, and the distance between the clockwise driving block 16 and the counter-clockwise driving block 17 of the driving part 11 corresponding to the wide detection edge 6 is equal to the length difference between the long detection edge 7 and the wide detection edge 6. So that the servo motor 9 can rotate forward for one period and then rotate backward for one period, and can drive the four photosensitive detectors 8 to reset to the original positions. The above one cycle is the number of turns that the servo motor 9 rotates to drive the photosensitive detector 8 on the long detection edge 7 to move from the long detection edge 7 to one end to the other end.
Therefore, when the detection frame 4 starts to detect the brightness, the servo motor 9 firstly rotates forwards for a period, so that the driving belt 10 is driven to rotate clockwise, the four clockwise driving blocks 16 drive the four photosensitive detectors 8 to slide, and the photosensitive detectors 8 on the two long detection edges 7 firstly start to slide under the abutting drive of the clockwise driving blocks 16; the clockwise moving blocks 16 on the two wide detection edges 6 need to move a certain distance to contact the photosensitive detectors 8, so that the photosensitive detectors 8 on the wide detection edges 6 can slip later than the photosensitive detectors 8 on the long detection edges 7. The servo motor 9 firstly rotates forwards for a period and then rotates backwards for a period, so that the driving belt 10 is driven to rotate anticlockwise, the four photosensitive detectors 8 are driven to slide by the four reverse-time driving blocks 17, and the photosensitive detectors 8 on the two long detection edges 7 firstly start sliding under the abutting driving of the reverse-time driving blocks 17; the reverse-time driving blocks 17 on the two wide detection sides 6 need to move a certain distance to contact the photosensitive detectors 8, so that the photosensitive detectors 8 on the wide detection sides 6 can slip later than the photosensitive detectors 8 on the long detection sides 7. The in-process maximum light intensity estimation module 5 receives light intensity signals detected in the process of slipping the four photosensitive detectors 8 and position signals output by the servo motor 9.
The maximum light intensity estimation module 5 constructs two-dimensional coordinates on the plane of the liquid crystal panel 1, where the lower left corner is set as the origin coordinate (0, 0), the coordinates of the photosensitive detector 8 on the left wide detection side 6 can be represented as (0, Y1), the coordinates of the photosensitive detector 8 on the right wide detection side 6 can be represented as (L, Y2), the coordinates of the photosensitive detector 8 on the lower long detection side 7 can be represented as (X1, 0), and the coordinates of the photosensitive detector 8 on the upper long detection side 7 can be represented as (X2, W). In the above parameters, L and W are constants, L represents the length of the liquid crystal panel 1, and W represents the width of the liquid crystal panel 1; y1, Y2, X1, and X2 are variables that respectively represent the positions of the four photosensitive detectors 8.
Therefore, in the detection process, the maximum estimation module respectively obtains the light intensity values output by the four photosensitive detectors 8, and records the maximum light intensity value and the coordinate of the maximum light intensity value. The coordinate of the maximum light intensity value can be obtained by calculation according to the distance signal output by the servo motor 9 and the initial coordinate of the photosensitive detector 8. Specifically, the initial coordinates of the photosensitive detector 8 on the left wide detection side 6 may be represented as (0, 0), the initial coordinates of the photosensitive detector 8 on the right wide detection side 6 may be represented as (L, W), the coordinates of the photosensitive detector 8 on the lower long detection side 7 may be represented as (L, 0), and the initial coordinates of the photosensitive detector 8 on the upper long detection side 7 may be represented as (0, W).
Suppose that the distance of forward rotation driving movement of the servo motor 9 is that the photosensitive detector 8 on the left wide detection edge 6 of M1 acquires the maximum light intensity value G1, the distance of driving movement is that the photosensitive detector 8 on the right wide detection edge 6 of M2 acquires the maximum light intensity value G2, the distance of driving movement is that the photosensitive detector 8 on the lower long detection edge 7 of M3 acquires the maximum light intensity value G3, and the distance of driving movement is that the photosensitive detector 8 on the upper wide detection edge 6 of M4 acquires the maximum light intensity value G4. Specifically, the coordinates of the maximum light intensity of the photosensitive detector 8 on the left wide detection side 6 may be represented as (0, M1- (L-W)), the coordinates of the maximum light intensity of the photosensitive detector 8 on the right wide detection side 6 may be represented as (L, W- (M2- (L-W))), the coordinates of the maximum light intensity of the photosensitive detector 8 on the lower long detection side 7 may be represented as (L-M3, 0), and the coordinates of the maximum light intensity of the photosensitive detector 8 on the upper long detection side 7 may be represented as (M4, W). Wherein the range of the ordinate of the maximum light intensity of the photosensitive detectors 8 on the two wide detection sides 6 is 0 to W.
The maximum light intensity estimation module 5 calculates a weighted mean value coordinate based on the maximum light intensity value of the coordinates where the maximum light intensities are output by the four photosensitive detectors 8, and determines the weighted mean value coordinate obtained by calculation as the coordinates where the maximum light intensities of the liquid crystal panel 1 are located. So that the maximum light intensity of the liquid crystal panel 1 is at the coordinate of (
) Wherein
Which is the abscissa of the coordinate on which the maximum light intensity of the liquid crystal panel 1 is located,
is the ordinate of the coordinate on which the maximum light intensity of the liquid crystal panel 1 is located.
The maximum light intensity estimation module 5 compares the maximum light intensity values output by the four photosensitive detectors 8 in sequence and sorts the maximum light intensity values;
estimating a brightness change value of a unit abscissa, a brightness change value of a unit ordinate and a maximum light intensity value of the liquid crystal panel 1 based on the three photosensitive detectors 8 in the first three of the maximum light intensity values;
wherein,
is a luminance change value in units of abscissa,
is a luminance change value in units of ordinate,
the maximum light intensity value output by the photo detector 8,
the abscissa on which the maximum light intensity value is output by the light detector,
the ordinate on which the maximum light intensity value output by the light detector is located,
which is the abscissa of the coordinate on which the maximum light intensity of the liquid crystal panel 1 is located,
which is the ordinate of the coordinate on which the maximum light intensity of the liquid crystal panel 1 is located,
the maximum light intensity value estimated for the liquid crystal panel 1.
If in this embodiment G3> G2> G4>G1. The following maximum light intensity values and coordinate values at which the maximum light intensity values of the light sensitive detectors 8 on the right side width detection side, the light sensitive detectors 8 on the lower side length detection side and the light sensitive detectors 8 on the upper side length detection side are obtained to estimate the maximum light intensity value of the liquid crystal panel 1
。
The maximum light intensity estimation module 5 determines the light intensity of the backlight source and estimates the maximum light intensity value of the liquid crystal panel 1 to be positively correlated. So that the greater the maximum light intensity on the liquid crystal panel 1, the greater the maximum light intensity estimation module 5 controls the light source driving module to increase the brightness of the backlight.
In summary, in the present invention, the four photosensitive detectors 8 arranged in a sliding manner obtain the maximum light intensity values on the four sides of the detection frame and the coordinates where the maximum light intensity values are located, and the maximum light intensity value estimation module estimates the coordinates where the maximum light intensity values on the liquid crystal panel 1 are located through the maximum light intensity values on the four sides and the coordinates where the maximum light intensity values are located. And then the maximum light intensity value on the liquid crystal panel 1 is estimated through the coordinate of the maximum light intensity value on the liquid crystal panel 1. Finally, the maximum light intensity estimation module 5 controls the luminous intensity of the backlight source through the light source driving module; the maximum light intensity value obtained by the method can be more accurately detected in the existing mode under the condition that only a local screen is irradiated by strong light, and the brightness of the backlight source is correspondingly adjusted, so that the watching quality of the liquid crystal display is improved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. The liquid crystal display comprises a liquid crystal panel (1), a backlight source (2) and a light source driving module (3), wherein the light source driving module (3) is electrically connected with the backlight source (2) and is used for driving the backlight source (2) to emit light, and the liquid crystal display is characterized in that: the device is characterized by further comprising a detection frame (4) surrounding the brightness on the peripheral outer wall of the liquid crystal panel (1) and a maximum light intensity estimation module (5) electrically connected to the light source driving module (3), wherein photosensitive detectors (8) are arranged on four side edges of the detection frame (4) in a sliding mode, servo driving modules for driving the photosensitive detectors (8) to slide in the four side edges of the detection frame (4) are installed in the detection frame (4), and the maximum light intensity estimation module (5) is further electrically connected to each photosensitive detector (8) and each servo driving module;
the detection frame (4) comprises two long detection edges (7) and two wide detection edges (6) which are vertically arranged between the two ends of the two long detection edges (7);
the photosensitive detector (8) is used for outputting the light intensity of the ambient light at the position where the photosensitive detector is located;
the servo driving module is used for outputting the position of the photosensitive detector (8);
the maximum light intensity estimation module (5) estimates and obtains the position of the maximum light intensity of the liquid crystal panel (1) and the maximum light intensity value of the liquid crystal panel (1) based on the position of the maximum light intensity detected by each photosensitive detector (8) and the position of the maximum light intensity output by the servo driving module corresponding to each photosensitive detector (8); and the maximum light intensity estimation module (5) determines the luminous intensity of the backlight (2) based on estimating the maximum light intensity value of the liquid crystal panel (1);
the light source driving module (3) controls the brightness output of the backlight source (2) according to the luminous intensity of the backlight source (2) determined by the maximum light intensity estimation module (5);
the maximum light intensity estimation module (5) constructs a two-dimensional coordinate on the plane where the liquid crystal panel (1) is located, and respectively acquires the coordinates where the maximum light intensities are output by the four photosensitive detectors (8) based on the output signals of the four photosensitive detectors (8) and the servo driving module;
the maximum light intensity estimation module (5) calculates the mean value coordinate of the coordinates where the maximum light intensity is output by the four photosensitive detectors (8), and judges the weighted mean value coordinate obtained by calculation as the coordinates where the maximum light intensity of the liquid crystal panel (1) is located;
the maximum light intensity estimation module (5) compares the maximum light intensity values output by the four photosensitive detectors (8) in sequence and sorts the maximum light intensity values;
based on the three photosensitive detectors (8) at the first three of the maximum light intensity values, estimating the brightness change value of the unit abscissa, the brightness change value of the unit ordinate and the maximum light intensity value of the liquid crystal panel (1);
wherein,
is a luminance change value in units of abscissa,
is a luminance change value in units of ordinate,
is the maximum light intensity value output by the photosensitive detector,
is the abscissa on which the maximum light intensity value output by the light detector is located,
is the ordinate on which the maximum light intensity value output by the light detector is located,
which is the abscissa of the coordinate on which the maximum light intensity of the liquid crystal panel is located,
which is the ordinate of the coordinate at which the maximum light intensity of the liquid crystal panel is located,
is the maximum light intensity value of the liquid crystal panel.
2. The liquid crystal display of claim 1, wherein: the servo driving module comprises a servo motor (9), a linkage mechanism, a driving belt (10) and a driving piece (11); the servo motor (9) is used as a power source to provide power for positive rotation and reverse rotation and is used for outputting a position signal to the maximum light intensity estimation module (5), the driving belts (10) are annularly arranged in four sides of the detection frame (4), the linkage mechanism is in linkage connection with the servo motor (9) and the driving belts (10), the driving parts (11) are arranged into four groups, and the four groups of driving parts (11) are respectively arranged on the driving belts (10) corresponding to the four photosensitive detectors (8) and are used for driving the four photosensitive detectors (8) to respectively slide on the four sides of the detection frame (4) in a reciprocating mode.
3. The liquid crystal display of claim 2, wherein: the long detection edge (7) and the wide detection edge (6) are provided with slideways (15) for the photosensitive detectors (8) to slide linearly on the outer sides of the driving belts (10).
4. The liquid crystal display of claim 3, wherein: and a trigger block (14) for abutting and driving the driving piece (11) is arranged on the inner side of the photosensitive detector (8) facing the driving belt (10) in a protruding mode.
5. The liquid crystal display of claim 2, wherein: the driving piece (11) comprises a clockwise driving block (16) and a counterclockwise driving block (17), the photosensitive detector (8) is arranged between the clockwise driving block (16) and the counterclockwise driving block (17) of the corresponding driving piece (11), the clockwise driving block (16) is used for pushing the photosensitive detector (8) to slide when the servo motor (9) drives the driving belt (10) to move clockwise, and the counterclockwise driving block (17) is used for pushing the photosensitive detector (8) to slide when the servo motor (9) drives the driving belt (10) to move counterclockwise.
6. The liquid crystal display of claim 5, wherein: the distance between the clockwise driving block (16) and the counterclockwise driving block (17) corresponding to the driving piece (11) on the wide detection edge (6) is larger than the distance between the clockwise driving block (16) and the counterclockwise driving block (17) corresponding to the driving piece (11) on the long detection edge (7).
7. The liquid crystal display of claim 1, wherein: the maximum light intensity estimation module (5) determines the luminous intensity of the backlight source (2) and estimates the maximum light intensity value of the liquid crystal panel (1) to be positively correlated.
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