TW201019014A - Liquid crystal display device and its backlight source generating method - Google Patents

Abstract

The invention provides a liquid crystal display device. The liquid crystal display device includes a liquid crystal panel and a backlight system. The backlight system includes a plurality of light emitting clusters. Each light emitting cluster includes three light emitting sets of R, G and B. Each light emitting set is composed of a plurality of LED light emitting units with different luminescence spectrums. A wide luminescence spectrum liquid crystal backlight source generating method includes: providing a plurality of LED light emitting units with different luminescence spectrums and combining the same to form a plurality of light emitting clusters; selecting a plurality of light emitting units from the light emitting clusters to form three light emitting sets of R, G and B; setting driving parameters respectfully for each LED light emitting unit based on the requirement of the light emitting color; and driving the three light emitting sets of R, G and B in a time-sharing manner according to the sequence of displaying fields. In the liquid crystal display device of the present invention, the luminescence spectrum range of the backlight source is relatively wide, so as to better restore or approach the real color of the natural scenery, thereby making the viewing more comfortable.

Description

201019014 IV. Designated representative map: (1) The representative representative of the case is: (8). (2) A brief description of the symbol of the representative figure: None 5. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention:

6. Description of the Invention: [Technical Field] The present invention relates to the field of liquid crystal display, and more particularly to a liquid crystal display device and a backlight generating method thereof. [Prior Art] Objects observed through the eyes in nature The spectrum of visible light is rich and often continuous. In the case of a conventional CCFL or LED-backlit liquid crystal display device, the light emitted by the backlight is discontinuous and has a limited number of spectral segments. The color we see from the LCD TV is the result of mixing the above non-continuous spectrum segments. 'This method is a complicated color color processing method, which can only basically reproduce the color of the original scene' and actual The color of the object has a large difference in the spectral composition components. The first, second, and third images respectively show the difference between the natural object reflection spectrum of the same color and the liquid crystal display crack display spectrum. Generally, the richer the spectral components, the closer to natural colors. The spectral line bandwidth of the backlight RGB LED of the liquid crystal display device shown in the fifth figure is far lower than the spectral line bandwidth of the three primary colors of the imaging shown in the fourth figure, and the half-width of the line is narrower than the color of 201019014. The color of the spectral line with a wide width at half maximum will cause the color of the liquid crystal display device to be distorted. In many cases, the color is too green or too red. Although the color gamut of the backlight of the liquid crystal display device is very wide, the image is The difference in realism is quite different from the natural environment in which people adapt to continuous line light. Therefore, in order for the image displayed by the liquid crystal display device to have a quality closer to the natural state of the object, it is necessary to provide a liquid crystal display device having a richer back spectrum line. SUMMARY OF THE INVENTION [Technical Problem] The technical problem to be solved by the present invention is to provide a liquid crystal display device having a rich back-spectrum line so that an image displayed thereon has an enamel closer to the natural state of the object. A liquid crystal display device includes a liquid crystal panel and a backlight system. The backlight system includes a plurality of light-emitting clusters. Each light-emitting cluster includes three red, green and blue light-emitting groups, and each light-emitting group is composed of LED light-emitting units with different spectral lines. . A further improvement of the liquid crystal display device provided by the present invention is to time-division driving the red, green and blue light-emitting groups by means of Φ field sequential display. More specifically, the illuminance of the red, green and blue illuminating groups of the illuminating cluster is dynamically controlled according to the brightness of the kneading surface. The invention provides a method for generating a wide-spectrum liquid crystal backlight, comprising: setting LED light-emitting units with different complex light-emitting lines to form a light-emitting cluster; selecting a plurality of light-emitting units in the light-emitting cluster to form an RGB three-light group, and according to the color of the light It is necessary to separately set driving parameters for each LED lighting unit; and time-division driving of the RGB three lighting groups by means of field sequential display. Further improvement of the method for producing the wide-spectrum liquid crystal backlight of the present invention is 201019014. The need for the silkness is to be heard - the development of the brightness-correction coefficient of the county Wei Wei liquid crystal back system (four) more advanced - the step according to the brightness of the surface The lighting unit needs to be dynamically controlled. The method is as follows: the red, green, and blue light-emitting groups of the light-emitting unit set the dynamic backlight coefficients are respectively ICr, Kg, Kb, and the light-emitting units that belong to the two-color light-emitting group, the number of backlights Take the average of both. Compared with the conventional liquid crystal display device, the liquid crystal display device provided by the present invention has a richer spectral line than the conventional liquid crystal display device, and is close to the continuous full spectrum of the self-definition boundary, thereby making the display The color of the system is closer to the color of the scene. It can better restore or approximate the true color of the natural scene. In addition, the full spectrum backlight of the simulated natural light is most suitable for the human eye, and can also relax the eyes and not cause fatigue. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used. The present invention is not intended to limit the present invention. It is an object of the present invention to provide a liquid crystal display device having a rich back-spectrum line. In order to achieve this, it is necessary to increase the width of the back spectral line, and the LED light source itself is compared with the light-emitting spectrum. Narrow, the present invention realizes the expansion of the backlight spectrum by adding LEDs of a plurality of spectral lines, but the increase of led cannot follow According to the shape of the line of the fourth figure, we don't need to add LEDs outside the line. At the same time, we need to increase the number of LEDs and their corresponding spectrum according to factors such as the width of the selected LED. Line 201019014,, the sixth picture 'The invention is achieved by adding a variety of == exhibition = party using 13 · to achieve the development of the image of the Li sixth sixth 増 plus pair. AQ A used 13 LEDs to simulate Like the three primary color g curve 'this is an example, you can also use other numbers of different spectral lines to group led according to the spectral line characteristics: although the first step I smoke complex =, achieve the spectrum, _ expansion, scale - LED hair The level also needs 3 samples to be more complex than the spectrum of the i. First, _ need to group all the LEDs, each group simulates a spectrum of colors. For example, the group of gamma is used to simulate the blue spectrum. Lines, 4 to 10 lines are used as a set of analog 2 chromatographic lines '8 to 13 lines' for a set of simulated red lines, we will find some LEDs are grouped into different groups. φ Next 'needs to be determined Each Lro drive parameter in each group: for example, for blue = line, we can use! 2, 3, 4, 5 (4) to analogy with its characteristic spectrum, ··· In order to make the characteristics of the composite line of the 1~5 LED synthesized composite blue line, we must face the luminous intensity of 1~5, for example, through adjustment The illumination driving parameters of Bu 5th LED are bl, b2, b3, b4, b5, and the blue spectrum of LED illumination simulation and the blue spectrum of camera system are obtained, please refer to the seventh figure. When determining the driving parameters, a specific instrument can be used to measure the spectral line of the light source. For example, the blue spectral line, first only the 驱动~5 LED driving signal, the point is free of 1~5 LED' and then the measured spectral line Compare with the three tomb color mixing curves of the image 'and then repeatedly adjust the driving parameters of bl, b2, b3, b4, b5, so that the spectrum of 1~5LED is closest to the curve that needs analogy. / In the same way, we can determine the driving parameters of the LED corresponding to the green line. 'But we can see from the sixth picture that we need to use 4~1〇舻τ ΡΓ| for the analogy of the 201019014 feature of the green line. Grab the z, β π π τ a view LED, then after the simulation, we get the drive parameters of the 4~10 LEDs g4, , g g9 gi〇. We can determine the 3 of the LED corresponding to the red line. In the figure, we can see that in order to compare the green line, we are going to use 8~13. ρή, grab *zc 眺LED 'then after the simulation We get 8~13戚LED corresponding drive parameters to find, ~1(), (1), η13. The above simulations can be listed as follows: & Blue group 1 to 5 LEDs are: M, b2, b3, M, b5; ❹ Green group 4 to 10 LFTVil .· .λ r 〇" is .g4, G5, g6, g7, g8, g9, g10; red group 8~U number LED is: r8, r9, xian, (1), guilty, willow; a... one brightness driving parameter (I) j can be made - such as The eighth bribery curve. The eve of the ^ ^ ^ ^ the demand 'this time according to the backlight design needs to adjust the entire backlight, ^; 增 booster - an overall brightness coefficient can make this backlight smashed. The degree coefficient is such that the above-mentioned LEDs meet the requirements of the following parameters: (4): Blue group 1 to 5 LEDs are: L* (M, b2, b3, b4, b5); ', color group 4 ~10 LED is: L* (g4, g5, g6, g7, g8, g9, gl, work color group 8~13 led: L*(r8, r9, rlO, rl l, rl2, rgl3) - ...——...... Brightness drive parameter (π) . . . ' . . . ' After the backlight of the field balance and brightness requirements, the present invention uses a thorough manner to drive different groups of LEDs in a time-division manner. Divide the original one, the = time In three parts, each part of the time period is used to display a kind of Yan Zhizhang, and the backlight only provides the backlight of the color. For example, the 201019014 displaying blue data has a blue backlight. Such an excellent can greatly increase the Wei rate, ^ Mter, this. The field sequence display steps are as follows: ·Thousands to reduce the monthly demand, reduce power consumption and when displaying blue data, I

The brightness is: L* B* (bl, Μ 1 to ~ 5 LED light, then no light., b5); and 6~13 LED when displaying green data, we only lack Reference: = L; G: (g4, g6, ^ LED does not emit light. (rlG m, rl2 "gl3); and other characteristics of the line of the base color mixing curve phase - also need to drive parameters have - The reason for the compensation of the $line area is mainly based on the driving parameters of the LED green bottle. We found that the LED color distribution curve of the three primary colors has a difference in shape, if the eighth ^a-primary color mixing curve If the red, green and blue characteristic normal line is mixed, then the spectral line area emitted by the LED may not satisfy the white balance due to the difference between the spectral area and the image-based three-base, so it is necessary to have a product. The compensation coefficient makes it meet the white balance indicator.

Μ^Ϊ2: ^ 1~5LED 莽 This level b2, W, Μ, Μ is driven to illuminate and then measured by the instrument, and the area inside the line is calculated. If there is a deviation, set b4:b Bt ' Then, for the 1~5 LED, the driving parameters Bt* (bl, b2, b3, and color bj) are driven to drive the light', and then according to the test result and the three primary colors of the image are mixed, and the *blue line is compared to determine whether to correct the Bt. Through the above method, finally 201019014 can get the blue compensation coefficient Bt. In the same way, the green and red compensation coefficients Gt and the driving parameters of the LED lighting parameters of each group can be respectively obtained. · Blue group 1~5 LEDs are: Bt * (bl, b2, b3, b4 , b5); green group 4~10 LED is ·· Gt * (g4, g5, g6, g7, g8, g9, gl〇); red group 8~13 LED is: Rt*(r8, r9, rlO , rll, ri2, rg13); ------------------------- Brightness drive parameter (冚) If after the above steps, due to measurement or calculation So that the backlight does not meet the requirements of white balance, then we only need to add a group of red, green and blue three: more than 1 = Bk, Gk, it can be. At this time, the number of LEDs is as follows: Blue group 1~5 LEDs are: Bt * (bl, b2, b3, b4, (6) Green group 4~10 LEDs are: Gk*Gt*(g4 5,),

Red group 8~13 LEDs are: Rk *Rt * (f8, _ j, g8, g9, glC, riU, rU, rl2, rgl3); exemption drive parameter (jy) ❹

The determination of Blc, Gk, and Rk can be made according to the instrument's Qi, so that it finally satisfies the white balance of the silk. In the case of satisfying the balance, the parameters of the tuned blue-faced light blue group 1~5 are: L* Bk*Bt * (bl, b2, & green group 4~10 LEDs are: (4) State* (4 b^b4, b5) glO); W 0 g6, g7, g8, g9, red group W3 LED is :1^壮他λ rg!3) ; , J rl0, rll, ri2, 201019014 --------------------- Brightness drive parameter (v) from 'brightness The driving parameter (m)' and the 'brightness driving parameter (V) can be seen that the expressions of the two are similar. We can express the two into the following form: Blue group 1~5 LED: L* B* (bl, b2, b3, b4, b5); 'Green group 4~10 LEDs are: _L*G * . (g4, g5, g6, g7, g8, g9., glO); . Red group 8 ~13 LED is: L* R * (r8, r9, rl0, rl 1, rl2, rgl3); % -------------------- Brightness drive parameters ( VI) After obtaining the backlight that meets the requirements of white balance and brightness, the above-mentioned field sequential display method is used to drive the different groups of LEDs in time to realize the liquid of the back spectrum line. Display means. On the basis of the above, the dynamic backlight method can be added to further reduce the power consumption and improve the dynamic color gamut to improve the contrast. Dynamic backlights generally determine the brightness of the backlight based on the actual state of the surface. The backlight brightness here is usually not fixed and changes instantaneously as the surface changes. For example, a red, green and blue tri-color backlight is different. 'We use three-color coefficient to indicate: red, green and blue three-color backlight with Kr, Kg, Kb (M=< Kr, Kg, Kb= <i, when the second indicates that the backlight is the brightest, the M system allows the minimum backlight, and the m selection panel is set according to the actual setting. 'The lowest is 0, 0 indicates that the backlight is off. Then display the driving parameters of each color backlight: Blue group 1~5 LEDs are: Kb *L * B* (bl, b2, b3, b4, b5) · Green group 4~10 LEDs are: I(g*L * G* (g4, g5 ' g6, g7, 8, 9, gl〇) ; , g , 201019014 Red group 8 to 13 LED is: Kr *L * R* (r8, r9, rlO, rl 1, rl2 , rgl3); TM - brightness drive parameter (Vff) The illumination unit of the backlight system can be controlled by means of overall simultaneous illumination, in addition to the above-mentioned field sequential display mode, which can also be controlled by means of overall simultaneous illumination, that is, according to the spectrum Line area compensation, brightness adjustment, white balance correction and other factors set a drive parameter μ for each LED illumination unit to form a three-light group.. Then display the drive parameters of each color backlight: ΜΙ, μ], M3... M13. Under the overall clear illumination mode, the backlight system provided by this magazine can also increase the dynamic backlight method to further reduce power consumption and improve the dynamic color gamut to improve the contrast. The dynamic backlight generally determines the brightness of the backlight according to the actual state of the picture. Backlight brightness is usually not fixed But as the picture changes, it changes instantly. According to the brightness of the surface, only the red, green and blue lights are formed. The dynamic backlight coefficients are Kr, Kg, Kb, and the two colors are two-color. The illumination unit of the group's backlight factor takes the average value of the two. Then the driving parameters of the backlights of each color are displayed: The blue group 1~5 LEDs are: &*(M1, M2, M3), (Kr+Kg) * (, M5)/2 201019014 Green group 4~10 LEDs are: Kg * (M6, M7, M8, M9, M10)., (Kr-fKg) * (M4 ' M5)/2 ; Red group 8~13 LED Kb * (Mil, M12, M3), (Kg+Kb) * (M8, M9, M10)/2; For the illumination unit shared by the two illumination groups, when the dynamic backlight control is performed, the backlight factor is taken as two The mean value is only one value, and other methods that consider the influence of the two-color backlight coefficient on the light-emitting units shared by the two light-emitting groups can be obtained. The read-crystal return device is provided by the hair-like method, and the back spectral line is relatively It is known that the spectrum of the liquid crystal display device is more abundant, close to the continuous full spectrum of the natural world, and the color from the (four) system is closer to the scene. The natural color. Reduction or better approximation of the true color of the natural scene, in addition, simulation of the full spectrum of natural light and the backlight is also different

Relax, not secret money. The eye (4) should be the best embodiment of the present invention and it is not necessary to make the invention. Anything in this (4) is not required to be changed, replaced or changed, and is made within Xiaoyuan. Any repairs. , 'Sentences should be included in the scope of protection of the present invention. [First description of the drawings] The first figure shows the blue natural object reflection spectrum and the liquid crystal display device 201019014 display spectrum; the second picture shows the green The contrast diagram of the natural object reflection spectrum and the liquid crystal display device display spectrum; the third figure shows the red natural object reflection spectrum and the liquid crystal display device display spectrum; the fourth picture is a conventional camera red green blue three The spectral line response of the channel; the fifth picture is the spectral curve of the LCD TV with LED as the backlight;

The sixth figure is a schematic diagram of the combination of multiple spectral LED emission lines into a three-color color mixing curve; the seventh picture is the blue spectrum of the LED illumination and the blue line of the camera system; the eighth picture is the LED illumination red A comparison chart of the green, blue spectral lines and the three primary color mixing curves of the imaging. [Main component symbol description] LED 1 ~ 13

Claims (1)

201019014 VII. Patent application scope: 1. A liquid crystal display device comprising a liquid crystal panel and a backlight system, the backlight system comprising a plurality of light-emitting clusters, wherein the improvement comprises: each light-emitting cluster comprises three red, green and blue light-emitting groups, each The illumination group includes a plurality of LED illumination units. 2. The liquid crystal display device of claim 2, wherein the plurality of LED light emitting units have different emission spectral lines. 3. The liquid crystal display device according to item i or item 2 of the patent application, wherein the red, green and blue light-emitting groups are time-divisionally driven by means of field sequential display. 4. The liquid crystal display device of claim 2, wherein the red and green light-emitting groups share a portion of the LED light-emitting unit. 5. The liquid crystal display device of claim 1 or 2, wherein the green and blue light-emitting groups share a portion of the LED light-emitting unit. 6. The liquid crystal display device according to claim 2 or 2, wherein the luminances of the red, green and blue light-emitting groups of the light-emitting clusters are dynamically controlled according to the degree of image necessity. The method for generating a liquid crystal backlight comprises: setting a combination of at least five LED light-emitting units with different spectral lines to form a light-emitting cluster; and setting a driving parameter for each LED light-emitting unit to form a whole of the light-emitting The spectral curve is close to the three-primary color mixing curve. 8. The method for generating a liquid crystal backlight according to claim 7, wherein the step of modifying comprises adding a brightness correction coefficient to the LED lighting unit according to the brightness of the backlight. The method for generating a liquid crystal backlight according to claim 7 or claim 8, wherein the brightness of the LED unit is dynamically controlled according to the brightness of the screen, and only red, green, The LED backlight unit of the blue three-color illumination group sets the dynamic backlight coefficients to be Kr, Kg 'Kb, respectively, and the pair of LED illumination units shared by the two-color illumination group, the backlight coefficients of which are taken as the average value. 10) A method for generating a liquid crystal backlight, comprising: setting a plurality of LED light emitting units with different emitting spectral lines to form a light emitting town; selecting a plurality of LED light emitting units in the light emitting cluster to form an RGB three light emitting group, and according to the light emitting The color needs to set the driving parameters for each of the LED lighting units; the RGB three-light group is used for time-division driving by means of field sequential display. 11. The method of generating a crystal backlight according to claim 10, further comprising modifying a brightness correction coefficient of each of the light-emitting units according to a brightness of the backlight. 12. The method of producing a liquid crystal backlight according to claim 10, wherein the method further comprises adding an area correction factor to each of the light-emitting units for correction. . . - - . . · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Each of the LED lighting units of the lighting group sets dynamic backlight coefficients Kr, Kg, and Kb, respectively.