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Browse Prior Art Database

4 Color LCD Display

IP.com Disclosure Number: IPCOM000015688D
Original Publication Date: 2002-Apr-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 36K

Publishing Venue

IBM

Abstract

Disclosed is a 4 color LCD display. This display device has additional white color cell with three color cells (Red, Green, Blue). Additional white color cell doesn't have color filter. So this white color is brighter than usual white color which is mixed with red, green and blue. When this display is used with mono mode, very high contrast can be achieved. If same back light brightness is applied, high contrast mono mode is achieve.

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4 Color LCD Display

Disclosed is a 4 color LCD display.

This display device has additional white color cell with three
color cells (Red, Green, Blue).

Additional white color cell doesn't have color filter. So this
white color is brighter than usual white color which is mixed
with red, green and blue. When this display is used with mono
mode, very high contrast can be achieved.

If same back light brightness is applied, high contrast mono mode
is achieve.

If same white brightness is required, low power mono mode is
achieved.

So disclosed display device has high contrast mono mode and low
power mono mode with ordinary color mode.

The following figure indicates comparison between 3 color LCD
panel and 4 color LCD panel.

Assumption :Transparency ratio=20%

each color brightness 1/3(Area) x 20%(transparency) = 1/15

then white brightness is 1/15 x 3 = 1/5 = 20%

RGB brightness is 1/4(Area) x 20%(transparency) = 1/20

White color brightness is 1/4(Area) x 100%(transparency) = 1/4

Then white brightness is 1/20 x 3 + 1/4 = 8/20 = 40%

3 color

4 color

RGB

RG

B

W

1