To improve the resolution of the color CRTs, we propose a new electrostatic lens system which has two additional electrodes between the focus electrode and the anode electrode. The anode voltage and focus voltage are supplied on these additional electrodes. The numerical simulation shows that the system can reduce the third order aberration coefficients almost up to 31% of the conventional system. And the experiments show that the typical beam spot diameter is improved by nearly 20% of the conventional system.

We developed the new electron gun, which can emit about twice electron in comparison with the conventional gun and could achieve the screen brightness of over 300 cd/m2 even if the ordinal driving circuit is applied. We tried two methods to improve the drive characteristics, and we chose to lower the cathode cut-off voltage. To maintain the resolution, we optimized the triode. And we used the tungsten-coated oxide cathode to guarantee the long life.

We've been developing new electron guns for a high brightness CRT. The electron guns were modified to increase the emission current without the increase of the driving voltage. We achieved the high brightness CRT with "low cut-off electron gun" and the gun was successfully introduced into our multimedia CRT. Now we are developing next generation gun or "double drive electron gun" for larger screen CRT. The gun can emit about double current in comparison with the "low cut-off electron gun."