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US 8,044,979 B2Granted
Active display device and mixing type pixel driving method in active display device
AssigneeTLI Inc.
InventorJae Gan Ko
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AssigneeTLI Inc.
InventorJae Gan Ko
Estimating the term…
A mixing type pixel driving method in an active display device includes generating a digital data for a selected pixel, first driving the selected pixel to be illuminated with a first illumination intensity, and second driving the selected pixel to be illuminated with a second illumination intensity in a second illumination interval. A relative ratio of the second illumination intensity to the first illumination intensity is changed according to the value of the digital data. The number of the converted bits by DAC is reduced. Therefore, the less bit DAC is adaptable for the mixing type pixel driving method and the layout area and the consumption current can be decreased.
A method of driving an active display device, the method comprising:
An active display device, comprising:
A method of driving an active display device, the method comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
By a combination of two or more gradation control methods: with combination of amplitude modulation and time modulation
Organic, e.g. using organic light-emitting diodes [OLED]: using an active matrix
Aspects of the constitution of display devices: active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal…
Details of power systems and of start or stop of display operation: power management, e.g. power saving
About 3 years 3 months of term left · ends 26 Jan 2030 (estimated)
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This application claims priority to Korean Application No. 10-2007-083328, filed on Aug. 20, 2007, and all the benefits accruing therefrom under 35 U.S.C. §119, the contents of which in its entirety are herein incorporated by reference.
1. Field of the Invention
The present invention relates to an active display device and a driving method for a pixel of an active display device. More particularly, the present invention relates to an active display device and a driving method for a pixel of an active display device having a decreased layout area and consumption current.
The above and other features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a drawing for describing a conventional pixel driving method according to the prior art;
FIG. 2 is a drawing for explaining Bloch's law;
‘Bloch's law’, also known as Bunsen-Roscoe law, tells about short time stimulation. According to ‘Bloch's law’, for short time-stimulation, if the product of stimulation intensity and stimulation time is the same, then there is little difference to the recognition human for stimulation. It may be expressed as l×t=k, where l is the intensity of a flash or stimulation, t is its duration or stimulation time, and k is a constant.
Referring to FIG. 2, CASE 1 shows that the stimulation time is 10 ms and the stimulation intensity is 10 cd/m2. CASE 2 shows that the stimulation time is 2 ms and the stimulation intensity is 50 cd/m2. Then, the product of stimulation intensity and stimulation time in CASE 1 is same as that in CASE2.
Thus, because the product, or constant k, is the same for both CASE 1 and CASE 2, a human cannot recognize the difference in stimulation between CASE 1 and CASE 2.