Method for storing Chinese characters in oled liquid crystal display_LCD display manufacturers talk about2

How to store Chinese characters in oled liquid crystal display_LCD display manufacturers talk about 1 Method of displaying Chinese characters with iphone LCD module Use graphic liquid crystal module to display Chinese characters and graphics in dot matrix form. Every 8 points make up 1 byte, and each point is represented by a binary digit. When a point with 1 is displayed, a bright spot will be displayed on the screen; a point with 0 will not be displayed on the screen. The most commonly used 16 The Chinese character dot matrix of ×16 consists of 32 bytes. Taking T6963C, a LCD screendriver controller widely used in our country, as an example, 8 horizontal dots on the LCD screen are 1 byte of data, and the 16×16 dot matrix font of the word '国' is shown in Figure 1. Through The font extraction software extracts the fonts of the character '国' in the way of first left, then right, first up, then down, and then the 32 byte values ​​corresponding to the font on the right side of Figure 1 can be obtained. Write these bytes into the display buffer of the mobile LCD screen controller in a certain order, and then the 16×16 'country' character can be displayed on the liquid crystal screen. Similarly, a 24×24 Chinese character needs 72 bytes, and the storage method is shown in Table 1. The storage methods of Chinese characters of other specifications can be deduced by analogy. 2 Typical interface circuit of LCD controller Input the extracted Chinese characters into the LCD controller through the single-chip microcomputer, and then display the required Chinese characters on the LCD module display according to the setting. Figure 2 is a typical interface circuit between a liquid crystal module and a microcontroller. In the figure, the 8051 single-chip microcomputer, which is widely used in our country, is selected as the MCU, and the 12864 (128×64) liquid crystal module is used. The built-in liquid crystal display driver controller is T6963C of Toshiba Corporation of Japan. In the circuit, the address lines A12-A15 and WR, RD signals are decoded by GAL16V8 to output the chip selection signal of the external expansion chip. The decoding address of the liquid crystal is 0xE000, and the address line A0 is connected to the C/D of the mobile LCD screen control port. When A0 is low, the LCD controller receives data, and when A0 is high, the LCD controller receives command codes. Therefore, the LCD data port address is 0xE000, and the LCD command port is 0xE001. Using KeilC51 for programming, the following definitions can be made in the program: #define XBYTE((unsigned char volatile xdata *) 0) #defineLcd_Data XBYTE[0×E000] //LCD data port #defineLcd_Code XBYTE[0×E001] // The data line of the LCD command port microcontroller is connected to the data port of the LCD controller through the 74HC245 bidirectional buffer. The chip select signal /LCD_CS of the LCD controller is used as the enable signal of the 74HC245, and the write signal /WR of the microcontroller controls the direction of data transmission. When /WR is low, the microcontroller data is written into the mobile phone LCD controller; when /WR is high, the CPU reads the data and status of the LCD controller. 3. Chinese character font storage and extraction methods In the single-chip microcomputer system, the following three methods can be adopted according to the program storage capacity of the single-chip microcomputer and its addressing space. ① Store the extracted Chinese character font data in the program storage area as a constant array. This method is more commonly used, and it is aimed at the situation that the program is not large or the single-chip microcomputer has no external expansion data storage area function.

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