TWI412794B - Method for improving color shift in liquid crystal display device - Google Patents

Description

Method for improving color shift of liquid crystal display

The present invention relates to a method for improving the color shift of a liquid crystal display, and more particularly to a method for improving the dark color shift of a liquid crystal display.

The liquid crystal display is mainly composed of a liquid crystal display panel and a backlight module. The liquid crystal display panel includes an Array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate. Since the liquid crystal layer itself does not emit light, the backlight module provides a light source required for displaying an image, and the color filter substrate mainly includes red, blue, and green light resists for converting grayscale images into color. image.

The existing liquid crystal display must be subjected to hue inspection after the assembly is completed, and the purpose thereof is to confirm whether the color performance of the liquid crystal display exhibits an Off State color shift phenomenon or an On State color shift phenomenon. Since the hue inspection is confirmed by the assembled product characteristics, the hue inspection must be performed after the liquid crystal display and the backlight module are assembled, and further determination is made as to whether or not improvement is required.

Please refer to FIG. 1 , which is a flow chart showing the hue inspection of the existing liquid crystal display. In step S100, three colors of red, blue, and green are formed. In step S110, red, blue, and green three-color photoresists are formed on the color filter substrate. In step S120, the color filter substrate and the array substrate are assembled and a liquid crystal layer is disposed therebetween to form a liquid crystal display panel. In step S130, the liquid crystal display panel and the backlight module are assembled into a liquid crystal display. In step S140, the liquid crystal display is subjected to a hue check to confirm whether the appearance has a dark state color shift phenomenon. If not, step S150 may be performed to deliver the assembled liquid crystal display to the client; if there is a dark state color shift phenomenon, After clarifying the problem of the color filter substrate, the process returns to step S100, and the red, blue, and green color photoresists are re-made, and steps S110 to S140 are repeated until no dark state color shift phenomenon occurs.

It can be understood that when the dark state color shift phenomenon cannot be solved and the problem source is a color filter, the steps S100 to S140 must be repeated continuously, because the demand for the development of the liquid crystal display model is increasing day by day, if the liquid crystal display is available. Before the assembly of the panel and the backlight module is estimated, the hue of the assembled state is estimated in advance to avoid the occurrence of dark state color shift, which can shorten the development time of the model and reduce the risk of re-manufacturing.

Therefore, it is necessary to propose a solution to the problem that the above liquid crystal display must be assembled after the hue inspection.

An object of the present invention is to provide a method for improving the color shift of a liquid crystal display, which can determine whether a dark state color shift phenomenon occurs before the liquid crystal display is assembled, and appropriately adjust the photoresist related characteristics according to the judgment.

The method for improving the color shift of a liquid crystal display according to the present invention includes: presetting a first preset value and a second preset value; providing a first color photoresist, a second color photoresist, and a third color photoresist, The first color photoresist is based on the second color photoresist and the third color photoresist, and the second color photoresist and the third color photoresist are coated on the plurality of glass substrates respectively. Obtaining a second color monochrome test piece and a third color monochrome test piece; measuring the second color monochrome test piece and the third color monochrome test piece to obtain the second color photoresist Light transmittance and a third light transmittance of the third color photoresist, and comparative analysis of the second color monochrome test piece and the third color monochrome test piece to obtain the second color photoresist a second dark luminance and a third dark luminance of the third color photoresist; calculating whether the second light transmittance, the second dark luminance, the third light transmittance, and the third dark luminance meet the following The first preset value and the range of the second preset value: And if the range is not met, at least one of the second light transmittance, the second dark luminance, the third light transmittance, and the third dark luminance is reset to meet the above range.

The method for improving the color shift of the liquid crystal display of the present invention can determine whether the liquid crystal display will have a dark color shift after the assembly is completed by the light transmittance and the darkness of the photoresist after the red, blue and green photoresists are fabricated. The phenomenon, instead of having to be assembled as in the prior art, can be known whether dark state color shift occurs, so development costs can be reduced.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

At present, when a liquid crystal display displays a color image, it is based on green color and is colored with red and blue. Therefore, red and blue have a great influence on the color after the matching, and it is easy to cause darkness after the liquid crystal display is assembled. The phenomenon of reddish or dark blue, that is, the effect of the two on color shift is greater than green. In this embodiment, the influence of the red and blue colors on the color shift is greater than that of the green color, and the liquid crystal display is made by appropriately defining the specific optical characteristics of the red photoresist and the blue photoresist (which will be described in detail later). It can be controlled and adjusted before the assembly is completed, so as to avoid dark color shift.

Please refer to FIG. 2, which is a flow chart showing a method for improving the color shift of a liquid crystal display according to the present invention. First, in step S200, a first preset value and a second preset value are preset as a range basis for subsequent specific optical characteristics to be met. In this embodiment, the first preset value is 2.5, and the second preset value is 10.

In step S210, a red photoresist, a blue photoresist, and a green photoresist are provided, wherein the liquid crystal display is based on a green photoresist and is matched with a red photoresist and a blue photoresist, and the red light is combined. The resistance and the blue photoresist are designed according to the color specifications of different development models.

In step S220, a red photoresist and a blue photoresist are respectively coated on the plurality of glass substrates to obtain a red monochrome test piece and a blue monochrome test piece, wherein the glass substrates are made of a light transmissive material. Made of no components on the surface.

In step S230, the monochromatic light characteristic measurement is performed on the red monochrome test piece and the blue monochrome test piece by using a one-color measuring machine to obtain the light transmittance of the red photoresist and the light transmittance of the blue photoresist. The red monochrome test piece and the blue monochrome test piece are comparatively analyzed by using a contrast machine to obtain the dark luminance of the red photoresist and the dark luminance of the blue photoresist. Generally speaking, the contrast machine has a polarizer. When comparing the red monochrome test piece and the blue monochrome test piece respectively, the brightness measured when the polarizer is transmitted is bright brightness, and the amount of the polarizer is opaque. The measured luminance is dark luminance.

In step S240, it is calculated whether the light transmittance of the red photoresist, the dark luminance of the red photoresist, the light transmittance of the blue photoresist, and the dark luminance of the blue photoresist meet the following ranges. If the following range is met, step S260 is performed. If the following range is not met, proceed to step S250:

For convenience of explanation, the ratio in the formula (1) may be referred to as "color resistivity ratio".

In step S250, at least one of the light transmittance of the red photoresist, the dark luminance of the red photoresist, the light transmittance of the blue photoresist, and the dark luminance of the blue photoresist are reset to meet the above range, and then Re-set the light transmittance, darkness, re-create new red and blue photoresist, and use the new red and blue photoresist to create a color filter substrate. When the color resist ratio is higher than 10, the ratio needs to be lowered at this time, and the light transmittance or dark luminance of the red photoresist may be lowered, or the light transmittance or dark luminance of the blue photoresist may be increased. When the color resist ratio is lower than 2.5, the ratio needs to be increased at this time, and the light transmittance or dark luminance of the red photoresist may be increased, or the light transmittance or dark luminance of the blue photoresist may be lowered.

In step S260, the color filter substrate is fabricated using a red photoresist and a blue photoresist that meet the above range.

Please refer to Figure 3 for a diagram showing whether 14 different liquid crystal displays conform to formula (1). Please refer to the numbers 1 to 10 first, which represent the design of 10 different red, blue and green photoresists respectively. The color transmittance of the 10 sets of red and blue photoresists is obtained by the color measuring machine, and the contrast is used. The dark luminance of the 10 sets of red and blue photoresists is obtained, and the color resistivity ratio is calculated (ie, As can be seen from the figure, the color resist ratios of the groups of numbers 1 to 10 are all between 2.5 and 10. Then, the color filter substrate is fabricated by using the red, blue, and green photoresists of the groups 1 to 10, and the color filter substrate, the array substrate, and the backlight module are assembled into a liquid crystal display, and the result of the hue inspection does not occur. The dark state color shift phenomenon is consistent with the result of the present invention judging that the dark state color shift phenomenon does not occur according to the formula (1).

Please refer to No. 11, using the color measuring machine to obtain the light transmittance of the red and blue photoresists of No. 11, and obtaining the dark luminance of the red and blue photoresists by using the contrast machine, and calculating the color resistivity ratio (ie, It can be seen from the figure that the color resist ratio is higher than 10, and therefore the dark state color shift phenomenon occurs in the set of photoresist designs by the formula (1) of the present invention. Then, the color filter substrate is fabricated by using the red, blue, and green photoresists, and the color filter substrate, the array substrate, and the backlight module are assembled into a liquid crystal display, and the result of the hue inspection is indeed dark reddish. It is consistent with the result that the present invention judges that a dark state color shift phenomenon occurs according to the formula (1). In order to improve the dark redness caused by No. 11, the color resistivity ratio should be reduced. No. 12 is redesigned according to the photoresist of No. 11. The red photoresist of No. 12 has a dark luminance lower than that of No. 11 The darkness of the light, and the light transmittance of the red photoresist of the number 12 is the same as the light transmittance of the red photoresist of the number 11, and the blue and green photoresists are also the same as the blue and green photoresist of the number 11. Finally, the number 12 of the set of photoresists is designed to have a new color resistivity ratio between 2.5 and 10, and then the color filter substrate is fabricated using the new set of red, blue, and green photoresists (ie, number 12). After the color filter substrate, the array substrate, and the backlight module are assembled into a liquid crystal display, the result of the hue inspection no longer causes a dark red phenomenon, that is, the dark state can be avoided after redesigning according to the method proposed by the present invention. A reddish phenomenon occurs. It should be noted that other ways of reducing the color photoresist ratio include reducing the light transmittance of the red photoresist, increasing the light transmittance of the blue photoresist or the dark luminance of the blue photoresist, and adjusting at least one of the above parameters simultaneously.

Please refer to No. 13, using the color measuring machine to obtain the light transmittance of the red and blue photoresist of No. 13, and obtaining the dark luminance of the red and blue photoresists by using the contrast machine, and calculating the color resistivity ratio (ie, It can be seen from the figure that the color resist ratio is less than 2.5, so that the dark state color shift phenomenon occurs in the set of photoresist designs by the formula (1) of the present invention. Then, using the set of red, blue, and green photoresists to form a color filter substrate, and assembling the color filter substrate, the array substrate, and the backlight module into a liquid crystal display, the result of the hue inspection does occur in a dark blue state. It is consistent with the result that the present invention judges that a dark state color shift phenomenon occurs according to the formula (1). In order to improve the dark blue phenomenon caused by No. 13, the color resistivity ratio must be increased. No. 14 is redesigned according to the photoresist of No. 13. The red photoresist of No. 14 has a dark luminance higher than that of No. 13. The darkness of the light, and the light transmittance of the red photoresist of No. 14 is the same as the light transmittance of the red photoresist of No. 13, and the blue and green photoresists are also the same as the blue and green photoresist of No. 13. Finally, the number 14 of the set of photoresists is designed to have a new color resistivity ratio between 2.5 and 10, and then the color filter substrate is fabricated using the new set of red, blue, and green photoresists (ie, number 14). After the color filter substrate, the array substrate, and the backlight module are assembled into a liquid crystal display, the result of the hue inspection no longer causes a dark blue phenomenon, that is, the black state is avoided after redesigning according to the method proposed by the present invention. The blue phenomenon occurs. It should be noted that other ways of increasing the color photoresist ratio include increasing the light transmittance of the red photoresist, reducing the light transmittance of the blue photoresist or the dark luminance of the blue photoresist, and adjusting at least one parameter at the same time.

In this embodiment, the monochrome characteristics of the red and blue photoresists are used to predict whether the photoresist will be detected after the photoresist is fabricated on the color filter substrate and assembled with the array substrate and the backlight module. In the method, the hue anomaly problem in which the dark state is reddish or the dark state is bluish is represented by a numerical value. When the color resistivity ratio is between 2.5 and 10, the dark state color shift phenomenon does not occur after the assembly is completed, when the color light is When the resistance ratio is lower than 2.5 or higher than 10, the light transmittance of the red photoresist, the dark luminance of the red photoresist, the light transmittance of the blue photoresist, and the dark luminance of the blue photoresist are appropriately adjusted, so that at least one of The color resistivity ratio is between 2.5 and 10, which avoids the dark color shift phenomenon after the subsequent assembly is completed.

It should be particularly noted that in other embodiments, if various colors are combined with red and green based on blue, the light transmittance and dark luminance of the red photoresist and the green photoresist can be appropriately set. The ratio is between a specific range to achieve the purpose of preventing dark state color shift in advance. In addition, if the colors are based on red and blue and green, the light transmittance and darkness of the blue photoresist and the green photoresist can be appropriately set so that the ratio is in another specific range. It can achieve the purpose of preventing the dark color shift phenomenon in advance.

In view of the above, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the invention, and the present invention may be made without departing from the spirit and scope of the invention. Various modifications and refinements are made, and the scope of the present invention is defined by the scope of the appended claims.

S100-S150‧‧‧Steps

S200-S260‧‧‧Steps

1 is a flow chart showing a hue inspection of a conventional liquid crystal display; FIG. 2 is a flow chart showing a method for improving the color shift of a liquid crystal display according to the present invention; and FIG. 3 is a view showing whether 14 different liquid crystal displays are in compliance with each other. An illustration of equation (1).

S200-S260. . . step

Claims (7)

A method for improving color shift of a liquid crystal display, comprising: presetting a first preset value and a second preset value, wherein the first preset value is to avoid a lower limit of a color shift of the liquid crystal display, the second pre- Setting a value to avoid the upper limit of the color shift of the liquid crystal display; providing a first color photoresist, a second color photoresist, and a third color photoresist, wherein the first color photoresist is based, and the second The color photoresist and the third color photoresist are combined with various colors. When the first color photoresist is a green photoresist, the second color photoresist is a red photoresist, and the third color photoresist is a blue photoresist, the The first preset value is 2.5 and the second preset value is 10; the second color photoresist and the third color photoresist are respectively coated on the plurality of glass substrates to obtain a second color monochrome test piece and a a third color monochrome test piece; measuring the second color monochrome test piece and the third color monochrome test piece to obtain a second light transmittance of the second color photoresist and the third color photoresist a third light transmittance, and comparing the second color monochrome test piece and the third color monochrome test piece And obtaining a second dark luminance of the second color photoresist and a third dark luminance of the third color photoresist; calculating the second light transmittance, the second dark luminance, and the third light transmittance And whether the third dark luminance meets the following first preset value and a range of the second preset value: And if the range is not met, at least one of the second light transmittance, the second dark luminance, the third light transmittance, and the third dark luminance is reset to meet the above range. The method for improving color shift of a liquid crystal display according to claim 1, wherein when the color resist ratio is lower than the first preset value, the step of resetting comprises: increasing the second light transmittance and increasing The second darkness, the third light transmittance, and the third darkness are reduced. The method for improving color shift of a liquid crystal display according to claim 1, wherein when the color resist ratio is higher than the second preset value, the step of resetting comprises: reducing the second light transmittance and decreasing The second dark luminance, the third light transmittance is increased, and at least one of the third dark luminance is increased. The method for improving color shift of a liquid crystal display according to claim 1, wherein the second light transmittance and the third light transmittance are respectively the second color monochrome test piece and the third color The monochrome test piece was obtained by measuring the characteristics of the monochromatic light. The method for improving the color shift of a liquid crystal display according to claim 4, wherein the monochromatic light characteristic measurement is performed by using a one-color measuring machine. The method for improving color shift of a liquid crystal display according to claim 1, wherein the second color monochrome test piece and the third color list are used by a contrast machine. The color test piece was subjected to comparative analysis. The method for improving the color shift of a liquid crystal display according to claim 1, wherein the glass substrates are made of a light transmissive material.