CN101739975B - Method for adjusting display effects of liquid crystal display module - Google Patents

Abstract

The invention discloses a method for adjusting display effects of a liquid crystal display module. The method comprises the following steps: S11, writing a black-and-white gray scale picture with a first strip and a second strip in the liquid crystal display module, wherein the first strip and the second strip are arranged in cross from up to down and have the same uniform gray scale; S12, producing the liquid crystal display module in small batch for determining a certain scale with the optimum display effect; S13, drawing a boundary line on the last surface of the certain scale with the optimum display effect; and S14, re-writing a standard picture, drawn with a boundary line, of the last surface of the certain scale in the liquid crystal module. In the method, the OTP adjustment is more accurate by utilizing black-and-white gray scale picture of the first and second strips arranged in cross from up to down; moreover the method for drawing the boundary line by a line on the last surface of the certain scale with the optimum display effect shortens the manufacturing time of LCM and enhances the production efficiency.

Description

A method for adjusting the display effect of a liquid crystal display module

【Technical field】

The invention belongs to the field of liquid crystal display, in particular to a method for adjusting the display effect of a liquid crystal display module. the

【Background technique】

The 21st century is the era of widespread application of liquid crystal displays, mainly in the application of liquid crystal televisions, personal computers, and mobile communication terminals, and the market for liquid crystal display devices has begun to grow rapidly. Liquid Crystal Displays (LCD for short) widely used in the market mainly include Film Super Twisted Nematic (FSTN for short), Color Super Twisted Nematic (CSTN for short) and Thin Film Transistor (TFT for short). Among them, the CSTN type is mainly used in small-sized LCD display, such as MP3, MP4, mobile phone and other displays. the

CSTN products on the market are all in the form of Liquid Crystal Module (LCM for short), which consists of a liquid crystal display, a liquid crystal display controller, a flexible printed circuit board, and a backlight unit. The liquid crystal display controller adjusts a series of parameters and characteristics such as voltage, phase, frequency, peak value, effective value, timing, and duty cycle applied to the pixels through the command system to establish certain driving conditions and make the display changeable. How to adjust the register value to make the LCD achieve a better display effect, you need to refer to the parameters of the LCD display and practice more. Generally speaking, the combination of voltage setting value, bias voltage and voltage doubler register can adjust the display brightness and color saturation of LCD. Saturation is poor. The voltage doubler output value (VOP) should be as consistent as possible with the best working voltage of the LCD itself. If the voltage doubler output value is too low, the LCD cannot work; if the voltage doubler output value is too high, the life of the liquid crystal will be shortened and the display will be white. For a small amount of LCD, we can complete the matching with the characteristics of the LCD parameters by adjusting different voltage doubler output value setting parameters, so as to obtain a better display effect. However, for mass production, due to the difference in the process, the liquid crystal parameters of the LCD deviate, and the VOP fixed setting value of the liquid crystal display controller cannot match it, and the display will appear thick or light, that is, the contrast is not good. In order to solve this problem, the LCD controller introduces the One Time Programmable (OTP) function, which can program the LCD controller through an external voltage without changing the VOP value setting of the command system. The action writes the VOP deviation value that needs to be adjusted to the liquid crystal display controller, so that the VOP value output by the liquid crystal display controller finally matches the best working voltage of the liquid crystal, and the LCD display can achieve a relatively ideal display effect. the

From the above analysis, it can be seen that the OTP function plays a very important role in mass production of LCMs with relatively consistent display effects. How can the display effect of each piece of LCM produced in large quantities be adjusted through OTP to achieve a relatively consistent display effect? The effect has become a problem that every LCM manufacturer needs to solve urgently. the

At present, most LCM manufacturers choose a general color picture for comparison and adjustment when performing OTP programming on the LCM. The effect of displaying a color picture with an LCM with a certain brightness and contrast is ideal as a standard product. On the side, other LCMs use the standard as a template to adjust the brightness and contrast under the same color picture. At the same time, other LCMs use the standard product as a template to adjust the OTP deviation value in the same color picture, and finally burn this deviation value into the LCD controller to obtain an effect that is closer to the standard product display. the

It can be seen from the aforementioned OTP operation that the color picture used in the OTP adjustment stage is after the OTP adjustment, which plays a key role in whether different LCMs can truly obtain consistent display effects. the

However, existing methods have the following shortcomings:

1. The color picture is too rich, and different operators have different judgments on the contrast and brightness of the color picture, which may cause them to think that the product whose adjustment is consistent with the display effect of the standard product actually deviates from the display of the standard product, resulting in artificial The phenomenon of inconsistency after adjustment, OTP adjustment accuracy is not high;

2. Every time the operator performs OTP operation, he needs to confirm the display effect of the standard template next to him, and then adjust the OTP, which prolongs the manufacturing time of LCM and lowers the production efficiency. the

【Content of invention】

The technical problem to be solved by the present invention is to provide a method for improving the display effect of the liquid crystal display module, which solves the problems of low OTP adjustment accuracy and low production efficiency during the manufacture of the existing LCM. the

The present invention is achieved through the following technical solutions:

A method for improving the display effect of a liquid crystal display module, comprising the following steps:

S11: Write a black-and-white grayscale picture with a first stripe and a second stripe in the liquid crystal display module, the first stripe and the second stripe are arranged alternately up and down, and the first stripe and the second stripe have the same uniform grayscale;

S12: Produce the liquid crystal display module in small batches to determine the best display effect at a certain stage;

S13: draw the upper boundary line with a line at the end of a certain order with the best display effect;

S14: Rewrite the standard picture with a line drawn as the upper boundary line at the end of a certain order into the liquid crystal display module;

Wherein, in the step S11, the first stripes and the second stripes are arranged alternately up and down in the following manner: the first stripes are from black to white, and the second stripes are from white to black; or, the first stripes are from white to black, and the second stripes are from white to black. Two stripes from black to white. the

In the present invention, by using a black-and-white grayscale image with a first stripe and a second stripe, the first stripe and the second stripe are arranged alternately up and down, and the first stripe and the second stripe have the same uniform grayscale, eliminating The different sensitivity of human eyes to color pictures causes the problem of inconsistency in adjustment, making OTP adjustment more precise; at the same time, draw the upper boundary line at the end of a certain level with the best display effect, and then use the line at the end of a certain level The method of rewriting the standard picture with the upper boundary line into the liquid crystal display module can save the time spent on constantly confirming the display effect of the standard template next to it during OTP operation, shorten the manufacturing time of LCM, and improve production efficiency. the

【Description of drawings】

The features and advantages of the present invention will be described in detail with reference to the accompanying drawings. the

Fig. 1 is a step-by-step diagram of a method for adjusting the display effect of a liquid crystal display module provided by an embodiment of the present invention;

Fig. 2 is the black-and-white uniform gray-scale picture of intersecting up and down provided by the embodiment of the present invention;

【Detailed ways】

Fig. 3 is a standard picture provided by the embodiment of the present invention. the

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. the

Please refer to Figure 1: a method for adjusting the display effect of a liquid crystal display module, which includes the following steps:

S11: Write a black-and-white grayscale picture with a first stripe and a second stripe in the liquid crystal display module, the first stripe and the second stripe are arranged alternately up and down, and the first stripe and the second stripe have the same uniform grayscale;

S12: Produce the liquid crystal display module in small batches to determine the best display effect at a certain stage;

S13: draw the upper boundary line with a line at the end of a certain order with the best display effect;

S14: Rewrite the standard picture with the upper boundary drawn with a line at the end of a certain step into the liquid crystal display module. the

Please refer to Fig. 2, in the method for adjusting the display effect of the liquid crystal display module, write a black and white, uniform gray scale display picture with a first stripe and a second stripe in the liquid crystal display module, and simultaneously the first stripe and the second stripe The second stripes are arranged alternately up and down. Such a display picture allows the R, G, and B sub-pixels in each pixel of the entire liquid crystal display to be displayed simultaneously, and there is no judgment error caused by rich colors to the human eye, because the human eye is sensitive to each color Different, using R, G, and B to display at the same time can eliminate this error. At the same time, choose the way that the first stripe and the second stripe are arranged vertically and alternately, and the arrangement can be: the first stripe is from black to white, the second stripe is from white to black; or, the first stripe is from white to black, and the second stripe is The gray scale display from black to white is to make the display of the entire liquid crystal display uniformly change from black to white or from white to black, so that the human eye can easily distinguish the intensity trend of the display contrast. If the entire liquid crystal display is used to display all the gray scales of the first stripe or the second stripe, it will cause fatigue to the human eyes, which is not convenient for judging during long-term production. Therefore, the OTP standard screen is made of an evenly divided gray-scale screen that is staggered up and down. The upper and lower halves of the LCD display the opposite trend of change, so that the entire LCD display will not be too monotonous and the human eyes will not be easily fatigued. the

When choosing to display pictures, it is not that the more gray scales displayed, the more evenly the LCD can be displayed, because the size of the CSTN-type LCD modules on the market is generally below 1.75 inches. A small-sized liquid crystal display displays higher-level gray-scale pictures, such as 32-level gray-scale pictures, and it is difficult to distinguish between gray levels. Preferably, the first stripe and the second stripe select a picture with 16 gray scales. the

In production, through the trial production of small batches of each type of LCD module (the quantity is generally within a few hundred pieces), basically the process of the LCD display has been controlled within a certain small range, and the display effect can be basically determined at this time. A certain level is the best contrast. Wherein, the determination of a certain level with the best display effect is from the first gray level to the gray level that can just be seen and displayed. the

Use a red line to draw the upper boundary line at the end of the first step with the best display effect. The length of the red line is one-third of the total length of the step, that is, one-third of the entire gray scale display length, and you can easily It can accurately judge the ideal effect boundary that OTP needs to adjust, and make the standard on the picture displayed by itself, so there is no need to compare the effect displayed by the standard LCD module next to it. At the same time, the red line with the length of one-third of the total length of the step is chosen here because the red line is only used as a reminder. If a red line with the length of the full step is drawn, the red color will affect the judgment of the human eye on the gray scale. Conducive to OTP precision control. the

Rewrite the standard picture with a line drawn at the end of a certain level of the best display effect into the liquid crystal display module, that is, the display of the standard product will be at a certain level of the best display effect. the

In the present invention, by using a black-and-white grayscale image with a first stripe and a second stripe, the first stripe and the second stripe are arranged alternately up and down, and the first stripe and the second stripe have the same uniform grayscale, eliminating The different sensitivity of human eyes to color pictures causes the problem of inconsistent adjustment, making OTP adjustment more precise; at the same time, draw the upper boundary line at the end of a certain level with the best display effect, and then use the line at the end of a certain level The method of rewriting the standard picture with the upper boundary line into the liquid crystal display module can save the time spent on constantly confirming the display effect of the standard template next to it during OTP operation, shorten the manufacturing time of LCM, and improve production efficiency. the

Now take a 1.5-inch CSTN liquid crystal display module with a dot matrix of 128×128 pixels as an example to describe in detail: 

In the LCM, write a black-and-white, uniform gray-scale picture with a first stripe and a second stripe through a micro-program controller (Micro Controller Unit, referred to as MCU). The first stripe and the second stripe are arranged alternately up and down. Both the first stripe and the second stripe are displayed in 16 gray scales, and the first stripe is arranged from black to white, and the second stripe is arranged from white to black. The written data of the 16 gray levels of the first stripe are 0X0000, 0X18C3, 0X2945, 0X39E7, 0X4A69, 0X5AEB, 0X6B6D, 0X7BEF, 0X8C71, 0X9CF3, 0XAD75, 0XBDF7, 0XCE79, 0XDEFB, 0XEF7D, 0XFFFF. From 0X0000 to 0XFFFF, it is equally divided into 16 levels of display, and the display width of each level is 128/16=8 pixel point width, and the display length is the sum of 128/2=64 pixel point lengths. Write 16 gray-scale pictures equally divided from OXFFFF to OX0000 in the next 128/2=64 pixel point length sum, that is, the interval of the second stripe gray-scale display picture. the

After small-batch production, basically the LCD process has been controlled within a certain small range, and at this time it can be basically confirmed that the display effect is at a certain level. Please refer to Figure 3. In this picture, the first stripes are arranged from black to white, and the second stripes are arranged from white to black. The display effect can just be seen at the 12th order, so the 12th order is determined to be the first order with the best display effect. On the last pixel of this level (16 gray levels, the width of each level is the sum of 8 pixel widths), that is, draw a red line 1/3 long on the 12th × 8 = 96 pixel points (that is, the length of 128/2/3=22 pixel points and) is convenient for the operator to distinguish. the

Rewrite the standard picture with the upper boundary line drawn with a line at the end of the 12th order of the best display effect into the liquid crystal display module, that is, the display of the standard product will be at a certain order of the best display effect in the future. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range. the

Claims (4)

1. a method of adjusting the LCD MODULE display effect is characterized in that, may further comprise the steps:

S11: in LCD MODULE, write black and white GTG picture with one first striped and one second striped, the arrangement of reporting to the leadship after accomplishing a task up and down of first striped and second striped, first striped has identical even GTG with second striped;

S12: carry out this LCD MODULE of small serial production, to confirm that optimal display result is at certain single order;

S13: certain single order of optimal display result backmost with line drawing on the boundary line;

S14: write in the LCD MODULE again with the normal pictures in boundary line in the line drawing certain single order backmost;

Wherein, among the said step S11, first striped and second striped report to the leadship after accomplishing a task up and down the mode of arranging can be for: first striped from black in vain, second striped is from vain to black; Perhaps, first striped from vain to black, second striped from black in vain.

2. a kind of method of adjusting the LCD MODULE display effect as claimed in claim 1 is characterized in that said first striped and second striped have 16 rank GTGs respectively.

3. a kind of method of adjusting the LCD MODULE display effect as claimed in claim 1; It is characterized in that; Among the said step S12; Further comprise: to the GTG that demonstration can just in sightly be arranged, the said pairing single order of GTG that demonstration can just in sightly be arranged is certain single order of optimal display result from the 1st rank GTG.

4. a kind of method of adjusting the LCD MODULE display effect as claimed in claim 1; It is characterized in that; Among the said step S13, further comprise: certain single order of optimal display result draw the boundary line with red line backmost, the length of said red line is the 1/3rd long of this rank length overall.

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