Pixel Bias Control Across Frame Stop Periods in Touch Displays
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Solution Overview
Problem
Display devices experience a difference in luminance before and after the frame stop period due to variations in bias and initialization times during touch sensing operations.
Innovation Solution
The display device applies different bias and initialization voltages to pixels before and after the frame stop period, ensuring consistent luminance by compensating for time discrepancies through separate voltage application to first and second pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch sensing operation is performed during frame stop period, then touch input recognition is enabled, but luminance difference occurs between pixels before and after frame stop period
Solution Approach 1:
The patent applies different bias voltages to different pixel groups based on their temporal position relative to the frame stop period. Pixels before the frame stop period receive a first bias voltage while pixels after receive a second bias voltage, creating local quality differences to compensate for the global luminance shift caused by touch sensing operations.
Solution Approach 2:
The patent dynamically changes the bias voltage parameter based on the timing of pixel operation relative to the frame stop period. By adjusting the bias voltage magnitude for different pixel groups, the system compensates for the luminance difference caused by the frame stop period, maintaining overall luminance consistency while enabling touch sensing.
2Adaptability or versatility
If frame stop period is introduced for touch sensing, then touch input detection is possible, but pixel performance becomes inconsistent across the display
Solution Approach 1:
The patent divides pixels into two groups based on their operational timing relative to the frame stop period and applies different bias voltages to each group. This local differentiation ensures that both pixel groups maintain consistent performance despite the temporal disruption caused by touch sensing operations.
Solution Approach 2:
The patent applies a first bias voltage to pixels before the frame stop period and a second bias voltage to pixels after the frame stop period. This preliminary voltage application strategy ensures that pixels are properly biased in advance of the frame stop period and maintained appropriately afterward, ensuring consistent performance.
3Device complexity
If uniform bias voltage is applied to all pixels, then device complexity is reduced, but luminance difference before and after frame stop period increases
Solution Approach 1:
Instead of applying a uniform bias voltage, the patent implements local quality differentiation by applying a first bias voltage to pixels before the frame stop period and a second bias voltage to pixels after. This localized voltage control compensates for the luminance shift while adding manageable complexity to the voltage control structure.
Solution Approach 2:
The patent introduces dynamic voltage control where the bias voltage changes based on the temporal position of pixel operation relative to the frame stop period. This dynamic adjustment allows the system to adapt to the changing operational conditions and maintain luminance uniformity despite the frame stop period disruption.
Data Source
AI summary
A display device includes: a display panel including pixels; a data driver configured to output data voltages to the pixels; a gate driver configured to output a write gate signal to write the data voltages to the pixels having an inactivation level in a frame stop period; a timing controller configured to control the data driver and the gate driver; and a voltage generator configured to apply a first bias voltage to first pixels to which the data voltages are written before the frame stop period among the pixels, and to apply a second bias voltage to second pixels to which the data voltages are written after the frame stop period among the pixels.