为什么显示器是黑屏

#include <reg52.h>
#define Disp_On 0x3f    //开显示      
#define Disp_Off 0x3e    //关显示
#define Col_Add 0x40    //
#define Page_Add 0xb8    //页起始地址
#define Start_Line 0xc0    //行起始地址
#define Lcd_Bus P0 //  MCU P0<------> LCM
sbit  Di     =P1^0;         //Data or Instrument Select  RS
sbit  RW     =P1^1;         //Write or Read        R/W
sbit  Enable =P1^2;         //6800 mode Enable single  E
sbit  Mcs    =P1^3;         //Master chip enable   CS1
sbit  Scs    =P1^4; //Slave chip enable     CS2
unsigned char i;
char code wang[]=
{
0x00,0x02,0x82,0x82,0x82,0x82,0x82,0xFE,0x82,0x82,0x82,0x82,0xC3,0x82,0x00,
0x00,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x3F,0x20,0x20,0x20,0x20,0x20,0x30,0x20,0x00
};
char code jun[]=
{
0x00,0x18,0x26,0x22,0xA2,0x72,0x2E,0xAA,0x22,0x22,0x22,0x32,0x22,0x0A,0x06,0x00,0x00,0x10,
0x10,0x12,0x13,0x12,0x12,0xFF,0x12,0x12,0x12,0x13,0x12,0x18,0x10,0x00
};
char code hua[]=
{
0x20,0x10,0x08,0xFC,0x03,0x02,0x10,0x10,0x7F,0x88,0x88,0x84,0x86,0xE4,0x00,0x00,0x00,0x04,0x04,
0x05,0x04,0x04,0x04,0xFF,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00
};
void delay(unsigned int t)       //延时子程序
{
unsigned int i,j;
for(i=0;i<t;i++)
for(j=0;j<10;j++);
}
void write_com(unsigned char cmdcode)   //写指令
{
Di=0;
RW=0;
Lcd_Bus=cmdcode;
delay(5);
Enable=1;
delay(5);
Enable=0;
}
void write_data(unsigned char Dispdata)    //写数据
{
Di=1;
RW=0;
Lcd_Bus=Dispdata;
delay(5);
Enable=1;
delay(5);
Enable=0;
}
void init_lcd()      //显示初始化
{

Mcs=1;
Scs=1;
delay(100);
write_com(Disp_Off);
write_com(Page_Add+0);
write_com(Start_Line+0);
write_com(Col_Add+0);
write_com(Disp_On);
}
void Clr_Scr()
{
unsigned char j,k;
Mcs=1;Scs=1;
write_com(Page_Add+0);
write_com(Col_Add+0);
for(k=0;k<8;k++)
   {
    write_com(Page_Add+k);
    for(j=0;j<64;j++)
        write_data(0x00);  
   }
}
void  main()
{
init_lcd();
write_com(0x01);
Clr_Scr();
write_com( 0xb8);
write_com( 0x40);
  for(i=0;i<16;i++)
     write_data(wang);
   
write_com( 0xb8+1);
write_com( 0x40);
  for(i=16;i<32;i++)
     write_data(wang);
write_com( 0xb8);
write_com( 0x40+16);
  for(i=0;i<16;i++)
     write_data(jun);
   
write_com( 0xb8+1);
write_com( 0x40+16);
  for(i=16;i<32;i++)
     write_data(jun);
  

write_com( 0xb8);
write_com( 0x40+32);
  for(i=0;i<16;i++)
     write_data(hua);
   
write_com( 0xb8+1);
write_com( 0x40+32);
  for(i=16;i<32;i++)
     write_data(hua);
  while(1);
  
}