Display Scan Timing for Faster Pixel Charging Without Extra Line Memory
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Solution Overview
Problem
Existing display devices face challenges in sufficiently charging pixels due to the adoption of overlap scan driving methods, leading to an increase in the number of required line memories and associated costs.
Innovation Solution
Implementing a display device with a scanning signal line drive circuit that includes a control circuit with a timing controller and level shifter, generating gate clock signals to create a frame near-head horizontal scanning period shorter than standard periods, and utilizing an OR circuit to generate a combined gate clock signal for faster scanning, thereby reducing the need for additional line memories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the selection pulse width of the scanning signal is made long to enable sufficient pixel charging, then pixel charging is improved, but the selection periods of adjacent scanning signal lines partially overlap and the horizontal scanning period increases
Solution Approach 1:
The patent applies dynamics by making the horizontal scanning period variable rather than constant. Specifically, the period from frame start to the fall of the selection pulse on the first scanning signal line is made shorter than other horizontal scanning periods within the same frame. This dynamic adjustment allows the selection pulse width to be sufficiently long for reliable pixel charging while keeping the overall frame timing efficient.
2Reliability
If the overlap scan driving method is adopted to sufficiently charge pixels, then pixel charging is improved, but the number of line memories increases and costs increase
Solution Approach 1:
The patent applies parameter changes by modifying the timing parameters of the scanning signal, specifically the horizontal scanning period duration. By making at least one horizontal scanning period shorter than others, the patent achieves sufficient pixel charging without requiring the traditional overlap scan method that would increase the number of line memories. This parameter adjustment resolves the contradiction between reliable pixel charging and device complexity.
3Speed
If the horizontal scanning period is shortened for faster scanning, then scanning speed is improved, but pixel charging time may be insufficient
Solution Approach 1:
The patent applies local quality by creating non-uniform horizontal scanning periods within a frame. Specifically, the period from frame start to the fall of the selection pulse on the first scanning signal line is shortened to improve scanning speed, while other horizontal scanning periods maintain longer durations to ensure sufficient pixel charging time. This local differentiation resolves the contradiction between scanning speed and charging time.
Data Source
AI summary
A display device includes a plurality of pixels arrayed in a matrix shape having a plurality of pixel rows and a plurality of pixel columns, a plurality of scanning signal lines, a plurality of display signal lines, a scanning signal line drive circuit that supplies a scanning signal including a selection pulse for selecting any one among the plurality of pixel rows to the plurality of scanning signal lines, and a display signal line drive circuit, in which the scanning signal line drive circuit is configured to make at least one frame near-head horizontal scanning period including a first horizontal scanning period of a plurality of horizontal scanning periods present in a period from a start of a frame of an input of the scanning signal line drive circuit to a fall of a selection pulse supplied to a first scanning signal line shorter than another horizontal scanning period.