Display Device Gate Line Driving Circuitry Intermittent Scanning
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Solution Overview
Problem
In touch screen panel integrated display devices, intermittent scanning of gate lines leads to display irregularities due to suspended scanning during touch driving mode, causing issues when resuming display driving mode.
Innovation Solution
A display device with driving circuitry that includes drive circuits with switching elements and a charging circuit to maintain and recharge internal line potentials, ensuring appropriate switching of gate lines during scanning periods, reducing display irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the scanning of gate lines is suspended during touch driving mode, then the touch screen can detect touch positions accurately, but display irregularities occur when the scanning is resumed
Solution Approach 1:
The patent applies preliminary action by recharging the internal line to the first potential before the scanning period resumes. The charging circuit is activated in advance during the non-scanning period to restore the potential of the internal line, ensuring that when scanning resumes, the drive circuit is in the proper state to avoid display irregularities. This proactive restoration of electrical potential prevents the harmful effects of potential degradation that occurs during the suspended scanning period.
2Adaptability or versatility
If the gate line scanning is performed intermittently between display and touch modes, then the device can function as both display and touch screen, but the potential within the shift register decreases during suspension period
Solution Approach 1:
The patent implements continuity of useful action by maintaining the charging capability during the non-scanning period. Rather than completely suspending electrical activity, the charging circuit remains active or is quickly reactivated to continuously restore the potential of the internal line. This continuous restoration action counteracts the potential degradation that naturally occurs during the suspension period, ensuring the shift register maintains its operational integrity across mode transitions.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the potential of the internal line based on the operational mode. During the non-scanning period, the charging circuit modifies the electrical parameters (potential levels) of the internal line to compensate for degradation. The system transitions between different potential states - maintaining first potential during scanning and restoring it during non-scanning - to adapt to the changing operational requirements while preventing harmful potential loss.
3Productivity
If the shift register holds predetermined potentials for scanning, then the gate lines can be scanned efficiently, but display irregularities occur when scanning is resumed after suspension
Solution Approach 1:
The patent applies beforehand cushioning by preparing the charging circuit to restore the internal line potential before the scanning period resumes. During the non-scanning period, the charging circuit accumulates the necessary electrical charge and readies the potential restoration mechanism. This preparatory action cushions against the potential degradation that would otherwise cause display irregularities, ensuring a smooth transition back to efficient scanning without compromising display quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution minimizes display irregularities by maintaining and recharging internal line potentials, allowing for smooth resumption of gate line scanning, thereby improving display performance.
Implementation Method 1
a second switching element that is connected to the internal line, the second switching element charging the internal line to a first potential before the corresponding gate line is switched to the selected state
Implementation Method 2
a third switching element that includes a drain electrode connected to the internal line, and a source electrode having a second potential that is lower than the first potential, the third switching element pulling down the potential of the internal line to a level of the potential of the second line when the corresponding gate line is in a non-selected state
Implementation Method 3
one of the plurality of drive circuits corresponding one of the gate lines that is selected at start of the scanning period, includes a charging circuit which recharges the internal line of this drive circuit to at least a potential at the same level as that of the first potential, before the start of this scanning period
Data Source
AI summary
Provided is a technique of causing less display irregularities to occur when the scanning of the gate lines is resumed in a display device in which the scanning of gate lines is performed intermittently.A display device includes a display panel, and a driving circuitry that includes a plurality of drive circuits for scanning gate lines. The driving circuitry alternately switches a scanning period in which the gate lines are scanned, and a non-scanning period in which the scanning of the gate lines is suspended, during one vertical scanning period, according to a control signal. Each driving circuit 301n includes a first switching element N that applies a selection voltage to the gate line; an internal line netA; a second switching element A that charges the internal line netA to a first potential; and a third switching element B that includes a drain electrode connected to the internal line netA, and a source electrode having a second potential that is lower than the first potential. a drive circuit corresponding one of the gate lines that is selected at start of the scanning period includes a charging circuit 301b(n) which recharges the internal line netA of this drive circuit to a potential equal to or higher than the first potential, before the start of this scanning period.